apurbapokharel · December 9, 2021 15:26
diff --git a/ALMToken.sol b/ALMToken.sol
 pragma solidity ^0.8.0;

 import "@openzeppelin/contracts/token/ERC1155/ERC1155.sol";
 import "@openzeppelin/contracts/utils/Counters.sol";
 import "@openzeppelin/contracts/access/AccessControl.sol";
 import "@openzeppelin/contracts/utils/math/SafeMath.sol";
 import "./WALM.sol";
 import "./Presale.sol";
 import "@openzeppelin/contracts/token/ERC20/IERC20.sol";

 contract ALM is ERC1155, AccessControl{
    using Counters for Counters.Counter;
    using SafeMath for uint256;
    
    event AlbumCreated(address owner, uint256 tokenId, uint256 totalMarketCap, string _albumId, address ercTokenAddress);
    event AlbumTokenMinted(address user, uint256 tokenId, uint256 amount);

    Counters.Counter private _tokenIds; // tracks the token ids

    struct AlbumExtraInfo{
        address artist;
        uint256 totalCap;
        address ercTokenAddress;        
    }
    /// maps the token id to the total cap
    mapping(uint256 => AlbumExtraInfo) public albumMetadata;
    
    Presale public preSaleContract;

    constructor() ERC1155("https://game.example/api/item/{id}.json") {
        _setupRole(DEFAULT_ADMIN_ROLE, msg.sender);
    }

    function supportsInterface(bytes4 interfaceId) public view virtual override(ERC1155, AccessControl) returns (bool) {
        return super.supportsInterface(interfaceId);
    }
    
    ///@notice checks if caller has admin role
    modifier IsAdmin {
        require(
            this.hasRole(this.DEFAULT_ADMIN_ROLE(), msg.sender),
            "ALM: Caller must have ADMIN role"
        );
        _;
    }

    ///@notice grants admin role to account
    ///@param _account adress to be granted role
    function addAdmin(address _account) public IsAdmin {
        grantRole(DEFAULT_ADMIN_ROLE, _account);
    }

    ///@notice set up the preSaleContract address
    ///@param _preSale adress of the presale
    function setPreSaleContractAddress(
        address _preSale
    ) public IsAdmin returns (bool){
        preSaleContract = Presale(_preSale);
    }


    ///@notice creates album ALM token of an album
    ///@param _owner address of the artist or album owner
    ///@param _tokenTotalCap supply of ALM to be minted for presale
    ///@param _albumId albumID of the album in spotify
    function createAlbum(
        address _owner,
        uint256 _tokenTotalCap,
        string memory _albumId,
        string memory _name,
        string memory _symbol
    ) public returns (uint256){
        _tokenIds.increment();
        uint256 newItemId = _tokenIds.current();
        uint256 totalALM = 1000000;
        address _ercTokenAddress = deploy(_name, _symbol, newItemId);

        albumMetadata[newItemId] = AlbumExtraInfo({
            artist: _owner,
            totalCap: _tokenTotalCap,
            ercTokenAddress: _ercTokenAddress
        });
        address _preSaleContract = address(preSaleContract);
        _mint(_preSaleContract, newItemId, _tokenTotalCap, " ");
        _mint(_owner, newItemId, totalALM.sub(_tokenTotalCap), " ");
        emit AlbumCreated(_owner, newItemId, _tokenTotalCap, _albumId, _ercTokenAddress);
        return newItemId;
    }

    ///@notice creates album ALM token of an album and initialized presale immediately
    ///@param _owner address of the artist or album owner
    ///@param _tokenTotalCap supply of ALM to be minted for presale
    ///@param _albumId albumID of the album in spotify
    function createAlbumAndInitializePresale(
        address _owner,
        uint256 _tokenTotalCap,
        string memory _albumId,
        string memory _name,
        string memory _symbol,
        uint256 _pricePerTokenInUSDC, 
        uint256 _offeringEndUnixTime
    ) public returns (uint256){
        _tokenIds.increment();
        uint256 newItemId = _tokenIds.current();
        uint256 totalALM = 1000000;
        address _ercTokenAddress = deploy(_name, _symbol, newItemId);

        albumMetadata[newItemId] = AlbumExtraInfo({
            artist: _owner,
            totalCap: _tokenTotalCap,
            ercTokenAddress: _ercTokenAddress
        });

        address _preSaleContract = address(preSaleContract);
        _mint(_preSaleContract, newItemId, _tokenTotalCap, " ");
        _mint(_owner, newItemId, totalALM.sub(_tokenTotalCap), " ");

        require(preSaleContract.instantInitializeOffering(newItemId, _pricePerTokenInUSDC, _offeringEndUnixTime, _tokenTotalCap),"ALM: Unable to initialize offering");
        emit AlbumCreated(_owner, newItemId, _tokenTotalCap, _albumId, _ercTokenAddress );
        return newItemId;
    }

    /*
    ///@notice create ERC20 token for an album and deploy
    ///@dev Create and Deploy ERC20 tokens for an album and deploys it.
    ///It set's the marketplace as the approved address for the tokenTotal supply.
    ///@param _tokenTotalCap total ERC20 to be minted
    ///@param _name name for the ERC20 token
    ///@param _symbol symbol for the ERC20 token
    */
    function deploy(string memory _name, string memory _symbol, uint256 _id) internal returns (address){
        WALM fungibleToken = new WALM(_name, _symbol, address(this), _id);
        return address(fungibleToken);
    }
    
    ///@notice returns extra info about the album
    ///@param _tokenId tokenId of the ALM token
    function getAlbumExtraInfo(
        uint256 _tokenId
    ) public view returns (AlbumExtraInfo memory){
        AlbumExtraInfo memory album =  albumMetadata[_tokenId];
        return album;
    }
    
    function getAlbumERC20Token(uint256 _tokenId) public view returns(address){
        AlbumExtraInfo memory album =  albumMetadata[_tokenId];
        address ad = album.ercTokenAddress;
        return ad;
    }
    
    function testCheckWALMBalance(address wal, address user) public view returns(uint256){
        uint256 balance = IERC20(wal).balanceOf(user);
        return balance;
    }

    ///@notice returns number of tokens minted
    function getcurrentNFTCount() public view returns (uint256){
        uint256 currentItemId = _tokenIds.current();
        return currentItemId;
    }

 }
diff --git a/Constants.sol b/Constants.sol
 // SPDX-License-Identifier: MIT

 pragma solidity >=0.6.6;


 /**
    Note: Simple contract to use as base for const vals
 */
 contract CommonConstants {

    bytes4 constant internal ERC1155_ACCEPTED = 0xf23a6e61; // bytes4(keccak256("onERC1155Received(address,address,uint256,uint256,bytes)"))
    bytes4 constant internal ERC1155_BATCH_ACCEPTED = 0xbc197c81; // bytes4(keccak256("onERC1155BatchReceived(address,address,uint256[],uint256[],bytes)"))
 }
diff --git a/DummyUSDC.sol b/DummyUSDC.sol
 // SPDX-License-Identifier: MIT

 pragma solidity ^0.8.0;

 import "@openzeppelin/contracts/token/ERC20/ERC20.sol";

 contract DummyUSDC is ERC20{
    
    address public minter;
    constructor() public ERC20("Dummy USD Coin", "USDC") {
        _mint(msg.sender, 100000);
        minter = msg.sender;
    }
    
    function decimals() public view virtual override returns (uint8) {
        return 2;
    }

     function mint(address to, uint256 amount) public virtual {
         require(msg.sender == minter, "USDC: Non Minter cannot mint token");
        _mint(to, amount);
    }
 }
diff --git a/liquidityPool...core...interfaces...IERC20.sol b/liquidityPool...core...interfaces...IERC20.sol
 pragma solidity >=0.5.0;

 interface IERC20 {
    event Approval(address indexed owner, address indexed spender, uint value);
    event Transfer(address indexed from, address indexed to, uint value);

    function name() external view returns (string memory);
    function symbol() external view returns (string memory);
    function decimals() external view returns (uint8);
    function totalSupply() external view returns (uint);
    function balanceOf(address owner) external view returns (uint);
    function allowance(address owner, address spender) external view returns (uint);

    function approve(address spender, uint value) external returns (bool);
    function transfer(address to, uint value) external returns (bool);
    function transferFrom(address from, address to, uint value) external returns (bool);
 }
diff --git a/liquidityPool...core...interfaces...IUniswapV2Callee.sol b/liquidityPool...core...interfaces...IUniswapV2Callee.sol
 pragma solidity >=0.5.0;

 interface IUniswapV2Callee {
    function uniswapV2Call(address sender, uint amount0, uint amount1, bytes calldata data) external;
 }
diff --git a/liquidityPool...core...interfaces...IUniswapV2ERC20.sol b/liquidityPool...core...interfaces...IUniswapV2ERC20.sol
 pragma solidity >=0.5.0;

 interface IUniswapV2ERC20 {
    event Approval(address indexed owner, address indexed spender, uint value);
    event Transfer(address indexed from, address indexed to, uint value);

    function name() external pure returns (string memory);
    function symbol() external pure returns (string memory);
    function decimals() external pure returns (uint8);
    function totalSupply() external view returns (uint);
    function balanceOf(address owner) external view returns (uint);
    function allowance(address owner, address spender) external view returns (uint);

    function approve(address spender, uint value) external returns (bool);
    function transfer(address to, uint value) external returns (bool);
    function transferFrom(address from, address to, uint value) external returns (bool);

    function DOMAIN_SEPARATOR() external view returns (bytes32);
    function PERMIT_TYPEHASH() external pure returns (bytes32);
    function nonces(address owner) external view returns (uint);

    function permit(address owner, address spender, uint value, uint deadline, uint8 v, bytes32 r, bytes32 s) external;
 }
diff --git a/liquidityPool...core...interfaces...IUniswapV2Factory.sol b/liquidityPool...core...interfaces...IUniswapV2Factory.sol
 pragma solidity >=0.5.0;

 interface IUniswapV2Factory {
    event PairCreated(address indexed token0, address indexed token1, address pair, uint);

    function feeTo() external view returns (address);
    function feeToSetter() external view returns (address);

    function getPair(address tokenA, address tokenB) external view returns (address pair);
    function allPairs(uint) external view returns (address pair);
    function allPairsLength() external view returns (uint);

    function createPair(address tokenA, address tokenB) external returns (address pair);

    function setFeeTo(address) external;
    function setFeeToSetter(address) external;
 }
diff --git a/liquidityPool...core...interfaces...IUniswapV2Pair.sol b/liquidityPool...core...interfaces...IUniswapV2Pair.sol
 pragma solidity >=0.5.0;

 interface IUniswapV2Pair {
    event Approval(address indexed owner, address indexed spender, uint value);
    event Transfer(address indexed from, address indexed to, uint value);

    function name() external pure returns (string memory);
    function symbol() external pure returns (string memory);
    function decimals() external pure returns (uint8);
    function totalSupply() external view returns (uint);
    function balanceOf(address owner) external view returns (uint);
    function allowance(address owner, address spender) external view returns (uint);

    function approve(address spender, uint value) external returns (bool);
    function transfer(address to, uint value) external returns (bool);
    function transferFrom(address from, address to, uint value) external returns (bool);

    function DOMAIN_SEPARATOR() external view returns (bytes32);
    function PERMIT_TYPEHASH() external pure returns (bytes32);
    function nonces(address owner) external view returns (uint);

    function permit(address owner, address spender, uint value, uint deadline, uint8 v, bytes32 r, bytes32 s) external;

    event Mint(address indexed sender, uint amount0, uint amount1);
    event Burn(address indexed sender, uint amount0, uint amount1, address indexed to);
    event Swap(
        address indexed sender,
        uint amount0In,
        uint amount1In,
        uint amount0Out,
        uint amount1Out,
        address indexed to
    );
    event Sync(uint112 reserve0, uint112 reserve1);

    function MINIMUM_LIQUIDITY() external pure returns (uint);
    function factory() external view returns (address);
    function token0() external view returns (address);
    function token1() external view returns (address);
    function getReserves() external view returns (uint112 reserve0, uint112 reserve1, uint32 blockTimestampLast);
    function price0CumulativeLast() external view returns (uint);
    function price1CumulativeLast() external view returns (uint);
    function kLast() external view returns (uint);

    function mint(address to) external returns (uint liquidity);
    function burn(address to) external returns (uint amount0, uint amount1);
    function swap(uint amount0Out, uint amount1Out, address to, bytes calldata data) external;
    function skim(address to) external;
    function sync() external;

    function initialize(address, address) external;
 }
diff --git a/liquidityPool...core...libraries...Math.sol b/liquidityPool...core...libraries...Math.sol
 pragma solidity >=0.5.0;
 //pragma solidity =0.5.16;

 // a library for performing various math operations

 library Math {
    function min(uint x, uint y) internal pure returns (uint z) {
        z = x < y ? x : y;
    }

    // babylonian method (https://en.wikipedia.org/wiki/Methods_of_computing_square_roots#Babylonian_method)
    function sqrt(uint y) internal pure returns (uint z) {
        if (y > 3) {
            z = y;
            uint x = y / 2 + 1;
            while (x < z) {
                z = x;
                x = (y / x + x) / 2;
            }
        } else if (y != 0) {
            z = 1;
        }
    }
 }
diff --git a/liquidityPool...core...libraries...SafeMath.sol b/liquidityPool...core...libraries...SafeMath.sol
 pragma solidity >=0.5.0;
 //pragma solidity =0.5.16;

 // a library for performing overflow-safe math, courtesy of DappHub (https://github.com/dapphub/ds-math)

 library SafeMath {
    function add(uint x, uint y) internal pure returns (uint z) {
        require((z = x + y) >= x, 'ds-math-add-overflow');
    }

    function sub(uint x, uint y) internal pure returns (uint z) {
        require((z = x - y) <= x, 'ds-math-sub-underflow');
    }

    function mul(uint x, uint y) internal pure returns (uint z) {
        require(y == 0 || (z = x * y) / y == x, 'ds-math-mul-overflow');
    }
 }
diff --git a/liquidityPool...core...libraries...UQ112x112.sol b/liquidityPool...core...libraries...UQ112x112.sol
 pragma solidity >=0.5.0;
 //pragma solidity =0.5.16;

 // a library for handling binary fixed point numbers (https://en.wikipedia.org/wiki/Q_(number_format))

 // range: [0, 2**112 - 1]
 // resolution: 1 / 2**112

 library UQ112x112 {
    uint224 constant Q112 = 2**112;

    // encode a uint112 as a UQ112x112
    function encode(uint112 y) internal pure returns (uint224 z) {
        z = uint224(y) * Q112; // never overflows
    }

    // divide a UQ112x112 by a uint112, returning a UQ112x112
    function uqdiv(uint224 x, uint112 y) internal pure returns (uint224 z) {
        z = x / uint224(y);
    }
 }
diff --git a/liquidityPool...core...UniswapV2ERC20.sol b/liquidityPool...core...UniswapV2ERC20.sol
 pragma solidity =0.5.16;

 import './interfaces/IUniswapV2ERC20.sol';
 import './libraries/SafeMath.sol';

 contract UniswapV2ERC20 is IUniswapV2ERC20 {
    using SafeMath for uint;

    string public constant name = 'Uniswap V2';
 string public constant symbol = 'UNI-V2';
    uint8 public constant decimals = 18;
    uint  public totalSupply;
    mapping(address => uint) public balanceOf;
    mapping(address => mapping(address => uint)) public allowance;

    bytes32 public DOMAIN_SEPARATOR;
    // keccak256("Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)");
    bytes32 public constant PERMIT_TYPEHASH = 0x6e71edae12b1b97f4d1f60370fef10105fa2faae0126114a169c64845d6126c9;
    mapping(address => uint) public nonces;

    event Approval(address indexed owner, address indexed spender, uint value);
    event Transfer(address indexed from, address indexed to, uint value);

    constructor() public {
        uint chainId;
        assembly {
            chainId := chainid
        }
        DOMAIN_SEPARATOR = keccak256(
            abi.encode(
                keccak256('EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)'),
                keccak256(bytes(name)),
                keccak256(bytes('1')),
                chainId,
                address(this)
            )
        );
    }

    function _mint(address to, uint value) internal {
        totalSupply = totalSupply.add(value);
        balanceOf[to] = balanceOf[to].add(value);
        emit Transfer(address(0), to, value);
    }

    function _burn(address from, uint value) internal {
        balanceOf[from] = balanceOf[from].sub(value);
        totalSupply = totalSupply.sub(value);
        emit Transfer(from, address(0), value);
    }

    function _approve(address owner, address spender, uint value) private {
        allowance[owner][spender] = value;
        emit Approval(owner, spender, value);
    }

    function _transfer(address from, address to, uint value) private {
        balanceOf[from] = balanceOf[from].sub(value);
        balanceOf[to] = balanceOf[to].add(value);
        emit Transfer(from, to, value);
    }

    function approve(address spender, uint value) external returns (bool) {
        _approve(msg.sender, spender, value);
        return true;
    }

    function transfer(address to, uint value) external returns (bool) {
        _transfer(msg.sender, to, value);
        return true;
    }

    function transferFrom(address from, address to, uint value) external returns (bool) {
        if (allowance[from][msg.sender] != uint(-1)) {
            allowance[from][msg.sender] = allowance[from][msg.sender].sub(value);
        }
        _transfer(from, to, value);
        return true;
    }

    function permit(address owner, address spender, uint value, uint deadline, uint8 v, bytes32 r, bytes32 s) external {
        require(deadline >= block.timestamp, 'UniswapV2: EXPIRED');
        bytes32 digest = keccak256(
            abi.encodePacked(
                '\x19\x01',
                DOMAIN_SEPARATOR,
                keccak256(abi.encode(PERMIT_TYPEHASH, owner, spender, value, nonces[owner]++, deadline))
            )
        );
        address recoveredAddress = ecrecover(digest, v, r, s);
        require(recoveredAddress != address(0) && recoveredAddress == owner, 'UniswapV2: INVALID_SIGNATURE');
        _approve(owner, spender, value);
    }
 }
diff --git a/liquidityPool...core...UniswapV2Factory.sol b/liquidityPool...core...UniswapV2Factory.sol
 pragma solidity =0.5.16;

 import './interfaces/IUniswapV2Factory.sol';
 import './UniswapV2Pair.sol';

 contract UniswapV2Factory is IUniswapV2Factory {
    address public feeTo;
    address public feeToSetter;

    mapping(address => mapping(address => address)) public getPair;
    address[] public allPairs;

    event PairCreated(address indexed token0, address indexed token1, address pair, uint);

    constructor(address _feeToSetter) public {
        feeToSetter = _feeToSetter;
    }

    function allPairsLength() external view returns (uint) {
        return allPairs.length;
    }

    function createPair(address tokenA, address tokenB) external returns (address pair) {
        require(tokenA != tokenB, 'UniswapV2: IDENTICAL_ADDRESSES');
        (address token0, address token1) = tokenA < tokenB ? (tokenA, tokenB) : (tokenB, tokenA);
        require(token0 != address(0), 'UniswapV2: ZERO_ADDRESS');
        require(getPair[token0][token1] == address(0), 'UniswapV2: PAIR_EXISTS'); // single check is sufficient
        bytes memory bytecode = type(UniswapV2Pair).creationCode;
        bytes32 salt = keccak256(abi.encodePacked(token0, token1));
        assembly {
            pair := create2(0, add(bytecode, 32), mload(bytecode), salt)
        }
        IUniswapV2Pair(pair).initialize(token0, token1);
        getPair[token0][token1] = pair;
        getPair[token1][token0] = pair; // populate mapping in the reverse direction
        allPairs.push(pair);
        emit PairCreated(token0, token1, pair, allPairs.length);
    }

    function setFeeTo(address _feeTo) external {
        require(msg.sender == feeToSetter, 'UniswapV2: FORBIDDEN');
        feeTo = _feeTo;
    }

    function setFeeToSetter(address _feeToSetter) external {
        require(msg.sender == feeToSetter, 'UniswapV2: FORBIDDEN');
        feeToSetter = _feeToSetter;
    }
 }
diff --git a/liquidityPool...core...UniswapV2Pair.sol b/liquidityPool...core...UniswapV2Pair.sol
 pragma solidity =0.5.16;

 import './interfaces/IUniswapV2Pair.sol';
 import './UniswapV2ERC20.sol';
 import './libraries/Math.sol';
 import './libraries/UQ112x112.sol';
 import './interfaces/IERC20.sol';
 import './interfaces/IUniswapV2Factory.sol';
 import './interfaces/IUniswapV2Callee.sol';

 contract UniswapV2Pair is IUniswapV2Pair, UniswapV2ERC20 {
    using SafeMath  for uint;
    using UQ112x112 for uint224;

    uint public constant MINIMUM_LIQUIDITY = 50;
    bytes4 private constant SELECTOR = bytes4(keccak256(bytes('transfer(address,uint256)')));

    address public factory;
    address public token0;
    address public token1;

    uint112 private reserve0;           // uses single storage slot, accessible via getReserves
    uint112 private reserve1;           // uses single storage slot, accessible via getReserves
    uint32  private blockTimestampLast; // uses single storage slot, accessible via getReserves

    uint public price0CumulativeLast;
    uint public price1CumulativeLast;
    uint public kLast; // reserve0 * reserve1, as of immediately after the most recent liquidity event

    uint private unlocked = 1;
    modifier lock() {
        require(unlocked == 1, 'UniswapV2: LOCKED');
        unlocked = 0;
        _;
        unlocked = 1;
    }

    function getReserves() public view returns (uint112 _reserve0, uint112 _reserve1, uint32 _blockTimestampLast) {
        _reserve0 = reserve0;
        _reserve1 = reserve1;
        _blockTimestampLast = blockTimestampLast;
    }

    function _safeTransfer(address token, address to, uint value) private {
        (bool success, bytes memory data) = token.call(abi.encodeWithSelector(SELECTOR, to, value));
        require(success && (data.length == 0 || abi.decode(data, (bool))), 'UniswapV2: TRANSFER_FAILED');
    }

    event Mint(address indexed sender, uint amount0, uint amount1);
    event Burn(address indexed sender, uint amount0, uint amount1, address indexed to);
    event Swap(
        address indexed sender,
        uint amount0In,
        uint amount1In,
        uint amount0Out,
        uint amount1Out,
        address indexed to
    );
    event Sync(uint112 reserve0, uint112 reserve1);

    constructor() public {
        factory = msg.sender;
    }

    // called once by the factory at time of deployment
    function initialize(address _token0, address _token1) external {
        require(msg.sender == factory, 'UniswapV2: FORBIDDEN'); // sufficient check
        token0 = _token0;
        token1 = _token1;
    }

    // update reserves and, on the first call per block, price accumulators
    function _update(uint balance0, uint balance1, uint112 _reserve0, uint112 _reserve1) private {
        require(balance0 <= uint112(-1) && balance1 <= uint112(-1), 'UniswapV2: OVERFLOW');
        uint32 blockTimestamp = uint32(block.timestamp % 2**32);
        uint32 timeElapsed = blockTimestamp - blockTimestampLast; // overflow is desired
        if (timeElapsed > 0 && _reserve0 != 0 && _reserve1 != 0) {
            // * never overflows, and + overflow is desired
            price0CumulativeLast += uint(UQ112x112.encode(_reserve1).uqdiv(_reserve0)) * timeElapsed;
            price1CumulativeLast += uint(UQ112x112.encode(_reserve0).uqdiv(_reserve1)) * timeElapsed;
        }
        reserve0 = uint112(balance0);
        reserve1 = uint112(balance1);
        blockTimestampLast = blockTimestamp;
        emit Sync(reserve0, reserve1);
    }

    // if fee is on, mint liquidity equivalent to 1/6th of the growth in sqrt(k)
    function _mintFee(uint112 _reserve0, uint112 _reserve1) private returns (bool feeOn) {
        address feeTo = IUniswapV2Factory(factory).feeTo();
        feeOn = feeTo != address(0);
        uint _kLast = kLast; // gas savings
        if (feeOn) {
            if (_kLast != 0) {
                uint rootK = Math.sqrt(uint(_reserve0).mul(_reserve1));
                uint rootKLast = Math.sqrt(_kLast);
                if (rootK > rootKLast) {
                    uint numerator = totalSupply.mul(rootK.sub(rootKLast));
                    uint denominator = rootK.mul(5).add(rootKLast);
                    uint liquidity = numerator / denominator;
                    if (liquidity > 0) _mint(feeTo, liquidity);
                }
            }
        } else if (_kLast != 0) {
            kLast = 0;
        }
    }

    // this low-level function should be called from a contract which performs important safety checks
    function mint(address to) external lock returns (uint liquidity) {
        (uint112 _reserve0, uint112 _reserve1,) = getReserves(); // gas savings
        uint balance0 = IERC20(token0).balanceOf(address(this));
        uint balance1 = IERC20(token1).balanceOf(address(this));
        uint amount0 = balance0.sub(_reserve0);
        uint amount1 = balance1.sub(_reserve1);

        bool feeOn = _mintFee(_reserve0, _reserve1);
        uint _totalSupply = totalSupply; // gas savings, must be defined here since totalSupply can update in _mintFee
        if (_totalSupply == 0) {
            liquidity = Math.sqrt(amount0.mul(amount1)).sub(MINIMUM_LIQUIDITY);
           _mint(address(0), MINIMUM_LIQUIDITY); // permanently lock the first MINIMUM_LIQUIDITY tokens
        } else {
            liquidity = Math.min(amount0.mul(_totalSupply) / _reserve0, amount1.mul(_totalSupply) / _reserve1);
        }
        require(liquidity > 0, 'UniswapV2: INSUFFICIENT_LIQUIDITY_MINTED');
        _mint(to, liquidity);

        _update(balance0, balance1, _reserve0, _reserve1);
        if (feeOn) kLast = uint(reserve0).mul(reserve1); // reserve0 and reserve1 are up-to-date
        emit Mint(msg.sender, amount0, amount1);
    }

    // this low-level function should be called from a contract which performs important safety checks
    function burn(address to) external lock returns (uint amount0, uint amount1) {
        (uint112 _reserve0, uint112 _reserve1,) = getReserves(); // gas savings
        address _token0 = token0;                                // gas savings
        address _token1 = token1;                                // gas savings
        uint balance0 = IERC20(_token0).balanceOf(address(this));
        uint balance1 = IERC20(_token1).balanceOf(address(this));
        uint liquidity = balanceOf[address(this)];

        bool feeOn = _mintFee(_reserve0, _reserve1);
        uint _totalSupply = totalSupply; // gas savings, must be defined here since totalSupply can update in _mintFee
        amount0 = liquidity.mul(balance0) / _totalSupply; // using balances ensures pro-rata distribution
        amount1 = liquidity.mul(balance1) / _totalSupply; // using balances ensures pro-rata distribution
        require(amount0 > 0 && amount1 > 0, 'UniswapV2: INSUFFICIENT_LIQUIDITY_BURNED');
        _burn(address(this), liquidity);
        _safeTransfer(_token0, to, amount0);
        _safeTransfer(_token1, to, amount1);
        balance0 = IERC20(_token0).balanceOf(address(this));
        balance1 = IERC20(_token1).balanceOf(address(this));

        _update(balance0, balance1, _reserve0, _reserve1);
        if (feeOn) kLast = uint(reserve0).mul(reserve1); // reserve0 and reserve1 are up-to-date
        emit Burn(msg.sender, amount0, amount1, to);
    }

    // this low-level function should be called from a contract which performs important safety checks
    function swap(uint amount0Out, uint amount1Out, address to, bytes calldata data) external lock {
        require(amount0Out > 0 || amount1Out > 0, 'UniswapV2: INSUFFICIENT_OUTPUT_AMOUNT');
        (uint112 _reserve0, uint112 _reserve1,) = getReserves(); // gas savings
        require(amount0Out < _reserve0 && amount1Out < _reserve1, 'UniswapV2: INSUFFICIENT_LIQUIDITY');

        uint balance0;
        uint balance1;
        { // scope for _token{0,1}, avoids stack too deep errors
        address _token0 = token0;
        address _token1 = token1;
        require(to != _token0 && to != _token1, 'UniswapV2: INVALID_TO');
        if (amount0Out > 0) _safeTransfer(_token0, to, amount0Out); // optimistically transfer tokens
        if (amount1Out > 0) _safeTransfer(_token1, to, amount1Out); // optimistically transfer tokens
        if (data.length > 0) IUniswapV2Callee(to).uniswapV2Call(msg.sender, amount0Out, amount1Out, data);
        balance0 = IERC20(_token0).balanceOf(address(this));
        balance1 = IERC20(_token1).balanceOf(address(this));
        }
        uint amount0In = balance0 > _reserve0 - amount0Out ? balance0 - (_reserve0 - amount0Out) : 0;
        uint amount1In = balance1 > _reserve1 - amount1Out ? balance1 - (_reserve1 - amount1Out) : 0;
        require(amount0In > 0 || amount1In > 0, 'UniswapV2: INSUFFICIENT_INPUT_AMOUNT');
        { // scope for reserve{0,1}Adjusted, avoids stack too deep errors
        uint balance0Adjusted = balance0.mul(1000).sub(amount0In.mul(3));
        uint balance1Adjusted = balance1.mul(1000).sub(amount1In.mul(3));
        require(balance0Adjusted.mul(balance1Adjusted) >= uint(_reserve0).mul(_reserve1).mul(1000**2), 'UniswapV2: K');
        }

        _update(balance0, balance1, _reserve0, _reserve1);
        emit Swap(msg.sender, amount0In, amount1In, amount0Out, amount1Out, to);
    }

    // force balances to match reserves
    function skim(address to) external lock {
        address _token0 = token0; // gas savings
        address _token1 = token1; // gas savings
        _safeTransfer(_token0, to, IERC20(_token0).balanceOf(address(this)).sub(reserve0));
        _safeTransfer(_token1, to, IERC20(_token1).balanceOf(address(this)).sub(reserve1));
    }

    // force reserves to match balances
    function sync() external lock {
        _update(IERC20(token0).balanceOf(address(this)), IERC20(token1).balanceOf(address(this)), reserve0, reserve1);
    }
 }
diff --git a/liquidityPool...periphery...interfaces...IERC1155.sol b/liquidityPool...periphery...interfaces...IERC1155.sol
 // SPDX-License-Identifier: MIT

 //pragma solidity ^0.8.0;
 pragma solidity >=0.5.0;

 import "./IERC165.sol";

 /**
 * @dev Required interface of an ERC1155 compliant contract, as defined in the
 * https://eips.ethereum.org/EIPS/eip-1155[EIP].
 *
 * _Available since v3.1._
 */
 interface IERC1155 is IERC165 {
    /**
     * @dev Emitted when `value` tokens of token type `id` are transferred from `from` to `to` by `operator`.
     */
    event TransferSingle(address indexed operator, address indexed from, address indexed to, uint256 id, uint256 value);

    /**
     * @dev Equivalent to multiple {TransferSingle} events, where `operator`, `from` and `to` are the same for all
     * transfers.
     */
    event TransferBatch(
        address indexed operator,
        address indexed from,
        address indexed to,
        uint256[] ids,
        uint256[] values
    );

    /**
     * @dev Emitted when `account` grants or revokes permission to `operator` to transfer their tokens, according to
     * `approved`.
     */
    event ApprovalForAll(address indexed account, address indexed operator, bool approved);

    /**
     * @dev Emitted when the URI for token type `id` changes to `value`, if it is a non-programmatic URI.
     *
     * If an {URI} event was emitted for `id`, the standard
     * https://eips.ethereum.org/EIPS/eip-1155#metadata-extensions[guarantees] that `value` will equal the value
     * returned by {IERC1155MetadataURI-uri}.
     */
    event URI(string value, uint256 indexed id);

    /**
     * @dev Returns the amount of tokens of token type `id` owned by `account`.
     *
     * Requirements:
     *
     * - `account` cannot be the zero address.
     */
    function balanceOf(address account, uint256 id) external view returns (uint256);

    /**
     * @dev xref:ROOT:erc1155.adoc#batch-operations[Batched] version of {balanceOf}.
     *
     * Requirements:
     *
     * - `accounts` and `ids` must have the same length.
     */
    function balanceOfBatch(address[] calldata accounts, uint256[] calldata ids)
        external
        view
        returns (uint256[] memory);

    /**
     * @dev Grants or revokes permission to `operator` to transfer the caller's tokens, according to `approved`,
     *
     * Emits an {ApprovalForAll} event.
     *
     * Requirements:
     *
     * - `operator` cannot be the caller.
     */
    function setApprovalForAll(address operator, bool approved) external;

    /**
     * @dev Returns true if `operator` is approved to transfer ``account``'s tokens.
     *
     * See {setApprovalForAll}.
     */
    function isApprovedForAll(address account, address operator) external view returns (bool);

    /**
     * @dev Transfers `amount` tokens of token type `id` from `from` to `to`.
     *
     * Emits a {TransferSingle} event.
     *
     * Requirements:
     *
     * - `to` cannot be the zero address.
     * - If the caller is not `from`, it must be have been approved to spend ``from``'s tokens via {setApprovalForAll}.
     * - `from` must have a balance of tokens of type `id` of at least `amount`.
     * - If `to` refers to a smart contract, it must implement {IERC1155Receiver-onERC1155Received} and return the
     * acceptance magic value.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 id,
        uint256 amount,
        bytes calldata data
    ) external;

    /**
     * @dev xref:ROOT:erc1155.adoc#batch-operations[Batched] version of {safeTransferFrom}.
     *
     * Emits a {TransferBatch} event.
     *
     * Requirements:
     *
     * - `ids` and `amounts` must have the same length.
     * - If `to` refers to a smart contract, it must implement {IERC1155Receiver-onERC1155BatchReceived} and return the
     * acceptance magic value.
     */
    function safeBatchTransferFrom(
        address from,
        address to,
        uint256[] calldata ids,
        uint256[] calldata amounts,
        bytes calldata data
    ) external;
 }
diff --git a/liquidityPool...periphery...interfaces...IERC1155Receiver.sol b/liquidityPool...periphery...interfaces...IERC1155Receiver.sol
 pragma solidity >=0.5.0;

 import "./IERC165.sol";

 /**
 * @dev _Available since v3.1._
 */
 interface IERC1155Receiver is IERC165 {
    /**
        @dev Handles the receipt of a single ERC1155 token type. This function is
        called at the end of a `safeTransferFrom` after the balance has been updated.
        To accept the transfer, this must return
        `bytes4(keccak256("onERC1155Received(address,address,uint256,uint256,bytes)"))`
        (i.e. 0xf23a6e61, or its own function selector).
        @param operator The address which initiated the transfer (i.e. msg.sender)
        @param from The address which previously owned the token
        @param id The ID of the token being transferred
        @param value The amount of tokens being transferred
        @param data Additional data with no specified format
        @return `bytes4(keccak256("onERC1155Received(address,address,uint256,uint256,bytes)"))` if transfer is allowed
    */
    function onERC1155Received(
        address operator,
        address from,
        uint256 id,
        uint256 value,
        bytes calldata data
    ) external returns (bytes4);

    /**
        @dev Handles the receipt of a multiple ERC1155 token types. This function
        is called at the end of a `safeBatchTransferFrom` after the balances have
        been updated. To accept the transfer(s), this must return
        `bytes4(keccak256("onERC1155BatchReceived(address,address,uint256[],uint256[],bytes)"))`
        (i.e. 0xbc197c81, or its own function selector).
        @param operator The address which initiated the batch transfer (i.e. msg.sender)
        @param from The address which previously owned the token
        @param ids An array containing ids of each token being transferred (order and length must match values array)
        @param values An array containing amounts of each token being transferred (order and length must match ids array)
        @param data Additional data with no specified format
        @return `bytes4(keccak256("onERC1155BatchReceived(address,address,uint256[],uint256[],bytes)"))` if transfer is allowed
    */
    function onERC1155BatchReceived(
        address operator,
        address from,
        uint256[] calldata ids,
        uint256[] calldata values,
        bytes calldata data
    ) external returns (bytes4);
 }
diff --git a/liquidityPool...periphery...interfaces...IERC165.sol b/liquidityPool...periphery...interfaces...IERC165.sol
 pragma solidity >=0.5.0;

 /**
 * @dev Interface of the ERC165 standard, as defined in the
 * https://eips.ethereum.org/EIPS/eip-165[EIP].
 *
 * Implementers can declare support of contract interfaces, which can then be
 * queried by others ({ERC165Checker}).
 *
 * For an implementation, see {ERC165}.
 */
 interface IERC165 {
    /**
     * @dev Returns true if this contract implements the interface defined by
     * `interfaceId`. See the corresponding
     * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section]
     * to learn more about how these ids are created.
     *
     * This function call must use less than 30 000 gas.
     */
    function supportsInterface(bytes4 interfaceId) external view returns (bool);
 }
diff --git a/liquidityPool...periphery...interfaces...IERC20.sol b/liquidityPool...periphery...interfaces...IERC20.sol
 pragma solidity >=0.5.0;

 interface IERC20 {
    event Approval(address indexed owner, address indexed spender, uint value);
    event Transfer(address indexed from, address indexed to, uint value);

    function name() external view returns (string memory);
    function symbol() external view returns (string memory);
    function decimals() external view returns (uint8);
    function totalSupply() external view returns (uint);
    function balanceOf(address owner) external view returns (uint);
    function allowance(address owner, address spender) external view returns (uint);
    function withdraw(uint amountALM) external;

    function approve(address spender, uint value) external returns (bool);
    function transfer(address to, uint value) external returns (bool);
    function transferFrom(address from, address to, uint value) external returns (bool);
 }
diff --git a/liquidityPool...periphery...interfaces...IUniswapV2Router01.sol b/liquidityPool...periphery...interfaces...IUniswapV2Router01.sol
 pragma solidity >=0.6.2;

 interface IUniswapV2Router01 {
    function factory() external pure returns (address);
    function WETH() external pure returns (address);
    function ALM() external pure returns (address);

    function addLiquidity(
        address tokenA,
        address tokenB,
        uint amountADesired,
        uint amountBDesired,
        uint amountAMin,
        uint amountBMin,
        address to,
        uint deadline
    ) external returns (uint amountA, uint amountB, uint liquidity);
    function addLiquidityALMandUSDC(
        address USDC,
        address WALM,
        uint idOfALM,
        uint amountUSDCDesired,
        uint amountALMDesired,
        uint amountUSDCMin,
        uint amountALMMin,
        address to,
        uint deadline
    ) external returns (uint amountUSDC, uint amountALM, uint liquidity);
    function addLiquidityETH(
        address token,
        uint amountTokenDesired,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline
    ) external payable returns (uint amountToken, uint amountETH, uint liquidity);
    function removeLiquidity(
        address tokenA,
        address tokenB,
        uint liquidity,
        uint amountAMin,
        uint amountBMin,
        address to,
        uint deadline
    ) external returns (uint amountA, uint amountB);
    function removeLiquidityETH(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline
    ) external returns (uint amountToken, uint amountETH);
    function removeLiquidityUSDCandALM(
        address USDC,
        address WALM,
        uint idOfALM,
        uint liquidity,
        uint amountUSDCMin,
        uint amountALMMin,
        address to,
        uint deadline
    ) external returns (uint amountUSDC, uint amountALM);
    function removeLiquidityWithPermit(
        address tokenA,
        address tokenB,
        uint liquidity,
        uint amountAMin,
        uint amountBMin,
        address to,
        uint deadline,
        bool approveMax, uint8 v, bytes32 r, bytes32 s
    ) external returns (uint amountA, uint amountB);
    function removeLiquidityETHWithPermit(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline,
        bool approveMax, uint8 v, bytes32 r, bytes32 s
    ) external returns (uint amountToken, uint amountETH);
    function swapExactTokensForTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external returns (uint[] memory amounts);
    function swapTokensForExactTokens(
        uint amountOut,
        uint amountInMax,
        address[] calldata path,
        address to,
        uint deadline
    ) external returns (uint[] memory amounts);
    function swapExactETHForTokens(uint amountOutMin, address[] calldata path, address to, uint deadline)
        external
        payable
        returns (uint[] memory amounts);
    function swapExactALMforUSDC(
        uint amountOutMin, 
        address[] calldata path, 
        address to, 
        uint deadline,
        uint idOfALM, 
        address WALM,
        uint amountIn
        )
        external
        returns (uint[] memory amounts);
    function swapTokensForExactETH(uint amountOut, uint amountInMax, address[] calldata path, address to, uint deadline)
        external
        returns (uint[] memory amounts);
    function swapExactUSDCForALM(
        uint amountIn, 
        uint amountOutMin, 
        address[] calldata path, 
        address to, 
        uint deadline,
        uint idOfALM, 
        address WALM
        )
        external
        returns (uint[] memory amounts);
    function swapExactTokensForETH(uint amountIn, uint amountOutMin, address[] calldata path, address to, uint deadline)
        external
        returns (uint[] memory amounts);
    function swapETHForExactTokens(uint amountOut, address[] calldata path, address to, uint deadline)
        external
        payable
        returns (uint[] memory amounts);

    function quote(uint amountA, uint reserveA, uint reserveB) external pure returns (uint amountB);
    function getAmountOut(uint amountIn, uint reserveIn, uint reserveOut) external pure returns (uint amountOut);
    function getAmountIn(uint amountOut, uint reserveIn, uint reserveOut) external pure returns (uint amountIn);
    function getAmountsOut(uint amountIn, address[] calldata path) external view returns (uint[] memory amounts);
    function getAmountsIn(uint amountOut, address[] calldata path) external view returns (uint[] memory amounts);
 }
diff --git a/liquidityPool...periphery...interfaces...IUniswapV2Router02.sol b/liquidityPool...periphery...interfaces...IUniswapV2Router02.sol
 pragma solidity >=0.6.2;
 import './IUniswapV2Router01.sol';

 interface IUniswapV2Router02 is IUniswapV2Router01 {
    function removeLiquidityETHSupportingFeeOnTransferTokens(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline
    ) external returns (uint amountETH);
    function removeLiquidityETHWithPermitSupportingFeeOnTransferTokens(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline,
        bool approveMax, uint8 v, bytes32 r, bytes32 s
    ) external returns (uint amountETH);

    function swapExactTokensForTokensSupportingFeeOnTransferTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external;
    function swapExactETHForTokensSupportingFeeOnTransferTokens(
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external payable;
    function swapExactTokensForETHSupportingFeeOnTransferTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external;
 }
diff --git a/liquidityPool...periphery...interfaces...IWALM.sol b/liquidityPool...periphery...interfaces...IWALM.sol
 pragma solidity >=0.5.0;

 interface IWALM {
    function transfer(address to, uint value) external returns (bool);
    function withdraw(uint) external;
 }
diff --git a/liquidityPool...periphery...interfaces...IWETH.sol b/liquidityPool...periphery...interfaces...IWETH.sol
 pragma solidity >=0.5.0;

 interface IWETH {
    function deposit() external payable;
    function transfer(address to, uint value) external returns (bool);
    function withdraw(uint) external;
 }
diff --git a/liquidityPool...periphery...libraries...artifacts...UniswapV2Library.json b/liquidityPool...periphery...libraries...artifacts...UniswapV2Library.json
 {
 	"deploy": {
 		"VM:-": {
 			"linkReferences": {},
 			"autoDeployLib": true
 		},
 		"main:1": {
 			"linkReferences": {},
 			"autoDeployLib": true
 		},
 		"ropsten:3": {
 			"linkReferences": {},
 			"autoDeployLib": true
 		},
 		"rinkeby:4": {
 			"linkReferences": {},
 			"autoDeployLib": true
 		},
 		"kovan:42": {
 			"linkReferences": {},
 			"autoDeployLib": true
 		},
 		"görli:5": {
 			"linkReferences": {},
 			"autoDeployLib": true
 		},
 		"Custom": {
 			"linkReferences": {},
 			"autoDeployLib": true
 		}
 	},
 	"data": {
 		"bytecode": {
 			"linkReferences": {},
 			"object": "60556023600b82828239805160001a607314601657fe5b30600052607381538281f3fe73000000000000000000000000000000000000000030146080604052600080fdfea265627a7a72315820226a0e666425ed6c126be6490b5896a02c4fb36ae9dce0ae19e1f2f87e3c394d64736f6c63430005100032",
 			"opcodes": "PUSH1 0x55 PUSH1 0x23 PUSH1 0xB DUP3 DUP3 DUP3 CODECOPY DUP1 MLOAD PUSH1 0x0 BYTE PUSH1 0x73 EQ PUSH1 0x16 JUMPI INVALID JUMPDEST ADDRESS PUSH1 0x0 MSTORE PUSH1 0x73 DUP2 MSTORE8 DUP3 DUP2 RETURN INVALID PUSH20 0x0 ADDRESS EQ PUSH1 0x80 PUSH1 0x40 MSTORE PUSH1 0x0 DUP1 REVERT INVALID LOG2 PUSH6 0x627A7A723158 KECCAK256 0x22 PUSH11 0xE666425ED6C126BE6490B PC SWAP7 LOG0 0x2C 0x4F 0xB3 PUSH11 0xE9DCE0AE19E1F2F87E3C39 0x4D PUSH5 0x736F6C6343 STOP SDIV LT STOP ORIGIN ",
 			"sourceMap": "120:4333:2:-;;132:2:-1;166:7;155:9;146:7;137:37;255:7;249:14;246:1;241:23;235:4;232:33;222:2;;269:9;222:2;293:9;290:1;283:20;323:4;314:7;306:22;347:7;338;331:24"
 		},
 		"deployedBytecode": {
 			"linkReferences": {},
 			"object": "73000000000000000000000000000000000000000030146080604052600080fdfea265627a7a72315820226a0e666425ed6c126be6490b5896a02c4fb36ae9dce0ae19e1f2f87e3c394d64736f6c63430005100032",
 			"opcodes": "PUSH20 0x0 ADDRESS EQ PUSH1 0x80 PUSH1 0x40 MSTORE PUSH1 0x0 DUP1 REVERT INVALID LOG2 PUSH6 0x627A7A723158 KECCAK256 0x22 PUSH11 0xE666425ED6C126BE6490B PC SWAP7 LOG0 0x2C 0x4F 0xB3 PUSH11 0xE9DCE0AE19E1F2F87E3C39 0x4D PUSH5 0x736F6C6343 STOP SDIV LT STOP ORIGIN ",
 			"sourceMap": "120:4333:2:-;;;;;;;;"
 		},
 		"gasEstimates": {
 			"creation": {
 				"codeDepositCost": "17000",
 				"executionCost": "94",
 				"totalCost": "17094"
 			},
 			"internal": {
 				"getAmountIn(uint256,uint256,uint256)": "infinite",
 				"getAmountOut(uint256,uint256,uint256)": "infinite",
 				"getAmountsIn(address,uint256,address[] memory)": "infinite",
 				"getAmountsOut(address,uint256,address[] memory)": "infinite",
 				"getReserves(address,address,address)": "infinite",
 				"pairFor(address,address,address)": "infinite",
 				"quote(uint256,uint256,uint256)": "infinite",
 				"sortTokens(address,address)": "infinite"
 			}
 		},
 		"methodIdentifiers": {}
 	},
 	"abi": []
 }
diff --git a/liquidityPool...periphery...libraries...artifacts...UniswapV2Library_metadata.json b/liquidityPool...periphery...libraries...artifacts...UniswapV2Library_metadata.json
 {
 	"compiler": {
 		"version": "0.5.16+commit.9c3226ce"
 	},
 	"language": "Solidity",
 	"output": {
 		"abi": [],
 		"devdoc": {
 			"methods": {}
 		},
 		"userdoc": {
 			"methods": {}
 		}
 	},
 	"settings": {
 		"compilationTarget": {
 			"gist-f88349dbc6ca5a594f8e07a279435a3f/liquidityPool/periphery/libraries/UniswapV2Library.sol": "UniswapV2Library"
 		},
 		"evmVersion": "istanbul",
 		"libraries": {},
 		"optimizer": {
 			"enabled": true,
 			"runs": 200
 		},
 		"remappings": []
 	},
 	"sources": {
 		"@uniswap/v2-core/contracts/interfaces/IUniswapV2Pair.sol": {
 			"keccak256": "0x7c9bc70e5996c763e02ff38905282bc24fb242b0ef2519a003b36824fc524a4b",
 			"urls": [
 				"bzz-raw://85d5ad2dd23ee127f40907a12865a1e8cb5828814f6f2480285e1827dd72dedf",
 				"dweb:/ipfs/QmayKQWJgWmr46DqWseADyUanmqxh662hPNdAkdHRjiQQH"
 			]
 		},
 		"gist-f88349dbc6ca5a594f8e07a279435a3f/liquidityPool/periphery/libraries/SafeMath.sol": {
 			"keccak256": "0x74ca8f81c5431dd1d29d89c17afa939c694704286c1ef8ffb835f77f1f995cea",
 			"urls": [
 				"bzz-raw://0d487ed09aa954ee0035a47f3a1a8d5fafb7e8f361cdbfaf0200a31e1db2f36c",
 				"dweb:/ipfs/QmTAqaunVRziVJ6UEHxHUmU5ePwAGxRYSSjk9eoNBbXuqZ"
 			]
 		},
 		"gist-f88349dbc6ca5a594f8e07a279435a3f/liquidityPool/periphery/libraries/UniswapV2Library.sol": {
 			"keccak256": "0xef7c889f667445fb0835499774dfa377004bc7422e82d242a0704bdfeb7f1141",
 			"urls": [
 				"bzz-raw://9d291af92cd1e110b31c80d981486906480ab7abd8155aa140dd1b335b189cc1",
 				"dweb:/ipfs/QmQRhrCKfa8ATEuzc2tyuLmBTkUtxLoMqc1Vyh1hoA9nAs"
 			]
 		}
 	},
 	"version": 1
 }
diff --git a/liquidityPool...periphery...libraries...SafeMath.sol b/liquidityPool...periphery...libraries...SafeMath.sol
 pragma solidity >=0.5.0;
 //pragma solidity =0.5.16;

 // a library for performing overflow-safe math, courtesy of DappHub (https://github.com/dapphub/ds-math)

 library SafeMath {
    function add(uint x, uint y) internal pure returns (uint z) {
        require((z = x + y) >= x, 'ds-math-add-overflow');
    }

    function sub(uint x, uint y) internal pure returns (uint z) {
        require((z = x - y) <= x, 'ds-math-sub-underflow');
    }

    function mul(uint x, uint y) internal pure returns (uint z) {
        require(y == 0 || (z = x * y) / y == x, 'ds-math-mul-overflow');
    }
 }
diff --git a/liquidityPool...periphery...libraries...UniswapV2Library.sol b/liquidityPool...periphery...libraries...UniswapV2Library.sol
 pragma solidity >=0.5.0;

 import '@uniswap/v2-core/contracts/interfaces/IUniswapV2Pair.sol';

 import "./SafeMath.sol";

 library UniswapV2Library {
    using SafeMath for uint;

    // returns sorted token addresses, used to handle return values from pairs sorted in this order
    function sortTokens(address tokenA, address tokenB) internal pure returns (address token0, address token1) {
        require(tokenA != tokenB, 'UniswapV2Library: IDENTICAL_ADDRESSES');
        (token0, token1) = tokenA < tokenB ? (tokenA, tokenB) : (tokenB, tokenA);
        require(token0 != address(0), 'UniswapV2Library: ZERO_ADDRESS');
    }

    // calculates the CREATE2 address for a pair without making any external calls
    function pairFor(address factory, address tokenA, address tokenB) internal pure returns (address pair) {
        (address token0, address token1) = sortTokens(tokenA, tokenB);
        pair = address(uint(keccak256(abi.encodePacked(
                hex'ff',
                factory,
                keccak256(abi.encodePacked(token0, token1)),
                hex'a2e111f822ea2c852c8ea11bc953334d8bb230af0f3e52eec512b2768bfc87c0' // init code hash
            ))));
    }

    // fetches and sorts the reserves for a pair
    function getReserves(address factory, address tokenA, address tokenB) internal view returns (uint reserveA, uint reserveB) {
        (address token0,) = sortTokens(tokenA, tokenB);
        (uint reserve0, uint reserve1,) = IUniswapV2Pair(pairFor(factory, tokenA, tokenB)).getReserves();
        (reserveA, reserveB) = tokenA == token0 ? (reserve0, reserve1) : (reserve1, reserve0);
    }

    // given some amount of an asset and pair reserves, returns an equivalent amount of the other asset
    function quote(uint amountA, uint reserveA, uint reserveB) internal pure returns (uint amountB) {
        require(amountA > 0, 'UniswapV2Library: INSUFFICIENT_AMOUNT');
        require(reserveA > 0 && reserveB > 0, 'UniswapV2Library: INSUFFICIENT_LIQUIDITY');
        amountB = amountA.mul(reserveB) / reserveA;
    }

    // given an input amount of an asset and pair reserves, returns the maximum output amount of the other asset
    function getAmountOut(uint amountIn, uint reserveIn, uint reserveOut) internal pure returns (uint amountOut) {
        require(amountIn > 0, 'UniswapV2Library: INSUFFICIENT_INPUT_AMOUNT');
        require(reserveIn > 0 && reserveOut > 0, 'UniswapV2Library: INSUFFICIENT_LIQUIDITY');
        uint amountInWithFee = amountIn.mul(997);
        uint numerator = amountInWithFee.mul(reserveOut);
        uint denominator = reserveIn.mul(1000).add(amountInWithFee);
        amountOut = numerator / denominator;
    }

    // given an output amount of an asset and pair reserves, returns a required input amount of the other asset
    function getAmountIn(uint amountOut, uint reserveIn, uint reserveOut) internal pure returns (uint amountIn) {
        require(amountOut > 0, 'UniswapV2Library: INSUFFICIENT_OUTPUT_AMOUNT');
        require(reserveIn > 0 && reserveOut > 0, 'UniswapV2Library: INSUFFICIENT_LIQUIDITY');
        uint numerator = reserveIn.mul(amountOut).mul(1000);
        uint denominator = reserveOut.sub(amountOut).mul(997);
        amountIn = (numerator / denominator).add(1);
    }

    // performs chained getAmountOut calculations on any number of pairs
    function getAmountsOut(address factory, uint amountIn, address[] memory path) internal view returns (uint[] memory amounts) {
        require(path.length >= 2, 'UniswapV2Library: INVALID_PATH');
        amounts = new uint[](path.length);
        amounts[0] = amountIn;
        for (uint i; i < path.length - 1; i++) {
            (uint reserveIn, uint reserveOut) = getReserves(factory, path[i], path[i + 1]);
            amounts[i + 1] = getAmountOut(amounts[i], reserveIn, reserveOut);
        }
    }

    // performs chained getAmountIn calculations on any number of pairs
    function getAmountsIn(address factory, uint amountOut, address[] memory path) internal view returns (uint[] memory amounts) {
        require(path.length >= 2, 'UniswapV2Library: INVALID_PATH');
        amounts = new uint[](path.length);
        amounts[amounts.length - 1] = amountOut;
        for (uint i = path.length - 1; i > 0; i--) {
            (uint reserveIn, uint reserveOut) = getReserves(factory, path[i - 1], path[i]);
            amounts[i - 1] = getAmountIn(amounts[i], reserveIn, reserveOut);
        }
    }
 }
diff --git a/liquidityPool...periphery...libraries...UniswapV2LiquidityMathLibrary.sol b/liquidityPool...periphery...libraries...UniswapV2LiquidityMathLibrary.sol
 pragma solidity >=0.5.0;

 import '@uniswap/v2-core/contracts/interfaces/IUniswapV2Pair.sol';
 import '@uniswap/v2-core/contracts/interfaces/IUniswapV2Factory.sol';
 import '@uniswap/lib/contracts/libraries/Babylonian.sol';
 import '@uniswap/lib/contracts/libraries/FullMath.sol';

 import './SafeMath.sol';
 import './UniswapV2Library.sol';

 // library containing some math for dealing with the liquidity shares of a pair, e.g. computing their exact value
 // in terms of the underlying tokens
 library UniswapV2LiquidityMathLibrary {
    using SafeMath for uint256;

    // computes the direction and magnitude of the profit-maximizing trade
    function computeProfitMaximizingTrade(
        uint256 truePriceTokenA,
        uint256 truePriceTokenB,
        uint256 reserveA,
        uint256 reserveB
    ) pure internal returns (bool aToB, uint256 amountIn) {
        aToB = FullMath.mulDiv(reserveA, truePriceTokenB, reserveB) < truePriceTokenA;

        uint256 invariant = reserveA.mul(reserveB);

        uint256 leftSide = Babylonian.sqrt(
            FullMath.mulDiv(
                invariant.mul(1000),
                aToB ? truePriceTokenA : truePriceTokenB,
                (aToB ? truePriceTokenB : truePriceTokenA).mul(997)
            )
        );
        uint256 rightSide = (aToB ? reserveA.mul(1000) : reserveB.mul(1000)) / 997;

        if (leftSide < rightSide) return (false, 0);

        // compute the amount that must be sent to move the price to the profit-maximizing price
        amountIn = leftSide.sub(rightSide);
    }

    // gets the reserves after an arbitrage moves the price to the profit-maximizing ratio given an externally observed true price
    function getReservesAfterArbitrage(
        address factory,
        address tokenA,
        address tokenB,
        uint256 truePriceTokenA,
        uint256 truePriceTokenB
    ) view internal returns (uint256 reserveA, uint256 reserveB) {
        // first get reserves before the swap
        (reserveA, reserveB) = UniswapV2Library.getReserves(factory, tokenA, tokenB);

        require(reserveA > 0 && reserveB > 0, 'UniswapV2ArbitrageLibrary: ZERO_PAIR_RESERVES');

        // then compute how much to swap to arb to the true price
        (bool aToB, uint256 amountIn) = computeProfitMaximizingTrade(truePriceTokenA, truePriceTokenB, reserveA, reserveB);

        if (amountIn == 0) {
            return (reserveA, reserveB);
        }

        // now affect the trade to the reserves
        if (aToB) {
            uint amountOut = UniswapV2Library.getAmountOut(amountIn, reserveA, reserveB);
            reserveA += amountIn;
            reserveB -= amountOut;
        } else {
            uint amountOut = UniswapV2Library.getAmountOut(amountIn, reserveB, reserveA);
            reserveB += amountIn;
            reserveA -= amountOut;
        }
    }

    // computes liquidity value given all the parameters of the pair
    function computeLiquidityValue(
        uint256 reservesA,
        uint256 reservesB,
        uint256 totalSupply,
        uint256 liquidityAmount,
        bool feeOn,
        uint kLast
    ) internal pure returns (uint256 tokenAAmount, uint256 tokenBAmount) {
        if (feeOn && kLast > 0) {
            uint rootK = Babylonian.sqrt(reservesA.mul(reservesB));
            uint rootKLast = Babylonian.sqrt(kLast);
            if (rootK > rootKLast) {
                uint numerator1 = totalSupply;
                uint numerator2 = rootK.sub(rootKLast);
                uint denominator = rootK.mul(5).add(rootKLast);
                uint feeLiquidity = FullMath.mulDiv(numerator1, numerator2, denominator);
                totalSupply = totalSupply.add(feeLiquidity);
            }
        }
        return (reservesA.mul(liquidityAmount) / totalSupply, reservesB.mul(liquidityAmount) / totalSupply);
    }

    // get all current parameters from the pair and compute value of a liquidity amount
    // **note this is subject to manipulation, e.g. sandwich attacks**. prefer passing a manipulation resistant price to
    // #getLiquidityValueAfterArbitrageToPrice
    function getLiquidityValue(
        address factory,
        address tokenA,
        address tokenB,
        uint256 liquidityAmount
    ) internal view returns (uint256 tokenAAmount, uint256 tokenBAmount) {
        (uint256 reservesA, uint256 reservesB) = UniswapV2Library.getReserves(factory, tokenA, tokenB);
        IUniswapV2Pair pair = IUniswapV2Pair(UniswapV2Library.pairFor(factory, tokenA, tokenB));
        bool feeOn = IUniswapV2Factory(factory).feeTo() != address(0);
        uint kLast = feeOn ? pair.kLast() : 0;
        uint totalSupply = pair.totalSupply();
        return computeLiquidityValue(reservesA, reservesB, totalSupply, liquidityAmount, feeOn, kLast);
    }

    // given two tokens, tokenA and tokenB, and their "true price", i.e. the observed ratio of value of token A to token B,
    // and a liquidity amount, returns the value of the liquidity in terms of tokenA and tokenB
    function getLiquidityValueAfterArbitrageToPrice(
        address factory,
        address tokenA,
        address tokenB,
        uint256 truePriceTokenA,
        uint256 truePriceTokenB,
        uint256 liquidityAmount
    ) internal view returns (
        uint256 tokenAAmount,
        uint256 tokenBAmount
    ) {
        bool feeOn = IUniswapV2Factory(factory).feeTo() != address(0);
        IUniswapV2Pair pair = IUniswapV2Pair(UniswapV2Library.pairFor(factory, tokenA, tokenB));
        uint kLast = feeOn ? pair.kLast() : 0;
        uint totalSupply = pair.totalSupply();

        // this also checks that totalSupply > 0
        require(totalSupply >= liquidityAmount && liquidityAmount > 0, 'ComputeLiquidityValue: LIQUIDITY_AMOUNT');

        (uint reservesA, uint reservesB) = getReservesAfterArbitrage(factory, tokenA, tokenB, truePriceTokenA, truePriceTokenB);

        return computeLiquidityValue(reservesA, reservesB, totalSupply, liquidityAmount, feeOn, kLast);
    }
 }
diff --git a/liquidityPool...periphery...libraries...UniswapV2OracleLibrary.sol b/liquidityPool...periphery...libraries...UniswapV2OracleLibrary.sol
 pragma solidity >=0.5.0;

 import '@uniswap/v2-core/contracts/interfaces/IUniswapV2Pair.sol';
 import '@uniswap/lib/contracts/libraries/FixedPoint.sol';

 // library with helper methods for oracles that are concerned with computing average prices
 library UniswapV2OracleLibrary {
    using FixedPoint for *;

    // helper function that returns the current block timestamp within the range of uint32, i.e. [0, 2**32 - 1]
    function currentBlockTimestamp() internal view returns (uint32) {
        return uint32(block.timestamp % 2 ** 32);
    }

    // produces the cumulative price using counterfactuals to save gas and avoid a call to sync.
    function currentCumulativePrices(
        address pair
    ) internal view returns (uint price0Cumulative, uint price1Cumulative, uint32 blockTimestamp) {
        blockTimestamp = currentBlockTimestamp();
        price0Cumulative = IUniswapV2Pair(pair).price0CumulativeLast();
        price1Cumulative = IUniswapV2Pair(pair).price1CumulativeLast();

        // if time has elapsed since the last update on the pair, mock the accumulated price values
        (uint112 reserve0, uint112 reserve1, uint32 blockTimestampLast) = IUniswapV2Pair(pair).getReserves();
        if (blockTimestampLast != blockTimestamp) {
            // subtraction overflow is desired
            uint32 timeElapsed = blockTimestamp - blockTimestampLast;
            // addition overflow is desired
            // counterfactual
            price0Cumulative += uint(FixedPoint.fraction(reserve1, reserve0)._x) * timeElapsed;
            // counterfactual
            price1Cumulative += uint(FixedPoint.fraction(reserve0, reserve1)._x) * timeElapsed;
        }
    }
 }
diff --git a/liquidityPool...periphery...UniswapV2Router02.sol b/liquidityPool...periphery...UniswapV2Router02.sol
 pragma solidity =0.6.6;

 import '@uniswap/v2-core/contracts/interfaces/IUniswapV2Factory.sol';
 import '@uniswap/lib/contracts/libraries/TransferHelper.sol';

 import './interfaces/IUniswapV2Router02.sol';
 import './libraries/UniswapV2Library.sol';
 import './libraries/SafeMath.sol';
 import './interfaces/IERC20.sol';
 import './interfaces/IWETH.sol';
 import './interfaces/IWALM.sol';
 import './interfaces/IERC1155.sol';
 import './interfaces/IERC1155Receiver.sol';
 import "../../Constants.sol";
 contract UniswapV2Router02 is IUniswapV2Router02, CommonConstants, IERC1155Receiver {
    using SafeMath for uint;

    address public immutable override factory;
    address public immutable override WETH;
    address public immutable override ALM;

    modifier ensure(uint deadline) {
        require(deadline >= block.timestamp, 'UniswapV2Router: EXPIRED');
        _;
    }

    constructor(address _factory, address _WETH, address _ALM) public {
        factory = _factory;
        WETH = _WETH;
        ALM = _ALM;
    }

    receive() external payable {
        assert(msg.sender == WETH); // only accept ETH via fallback from the WETH contract
    }
 
    // **** ADD LIQUIDITY ****
    function _addLiquidity(
        address tokenA,
        address tokenB,
        uint amountADesired,
        uint amountBDesired,
        uint amountAMin,
        uint amountBMin
    ) internal virtual returns (uint amountA, uint amountB) {
        // create the pair if it doesn't exist yet
        if (IUniswapV2Factory(factory).getPair(tokenA, tokenB) == address(0)) {
            IUniswapV2Factory(factory).createPair(tokenA, tokenB);
        }
        (uint reserveA, uint reserveB) = UniswapV2Library.getReserves(factory, tokenA, tokenB);
        if (reserveA == 0 && reserveB == 0) {
            (amountA, amountB) = (amountADesired, amountBDesired);
        } else {
            uint amountBOptimal = UniswapV2Library.quote(amountADesired, reserveA, reserveB);
            if (amountBOptimal <= amountBDesired) {
                require(amountBOptimal >= amountBMin, 'UniswapV2Router: INSUFFICIENT_B_AMOUNT');
                (amountA, amountB) = (amountADesired, amountBOptimal);
            } else {
                uint amountAOptimal = UniswapV2Library.quote(amountBDesired, reserveB, reserveA);
                assert(amountAOptimal <= amountADesired);
                require(amountAOptimal >= amountAMin, 'UniswapV2Router: INSUFFICIENT_A_AMOUNT');
                (amountA, amountB) = (amountAOptimal, amountBDesired);
            }
        }
    }
    function addLiquidity(
        address tokenA,
        address tokenB,
        uint amountADesired,
        uint amountBDesired,
        uint amountAMin,
        uint amountBMin,
        address to,
        uint deadline
    ) external virtual override ensure(deadline) returns (uint amountA, uint amountB, uint liquidity) {
        (amountA, amountB) = _addLiquidity(tokenA, tokenB, amountADesired, amountBDesired, amountAMin, amountBMin);
        address pair = UniswapV2Library.pairFor(factory, tokenA, tokenB);
        TransferHelper.safeTransferFrom(tokenA, msg.sender, pair, amountA);
        TransferHelper.safeTransferFrom(tokenB, msg.sender, pair, amountB);
        liquidity = IUniswapV2Pair(pair).mint(to);
    }
    function addLiquidityETH(
        address token,
        uint amountTokenDesired,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline
    ) external virtual override payable ensure(deadline) returns (uint amountToken, uint amountETH, uint liquidity) {
        (amountToken, amountETH) = _addLiquidity(
            token,
            WETH,
            amountTokenDesired,
            msg.value,
            amountTokenMin,
            amountETHMin
        );
        address pair = UniswapV2Library.pairFor(factory, token, WETH);
        TransferHelper.safeTransferFrom(token, msg.sender, pair, amountToken);
        IWETH(WETH).deposit{value: amountETH}();
        assert(IWETH(WETH).transfer(pair, amountETH));
        liquidity = IUniswapV2Pair(pair).mint(to);
        // refund dust eth, if any
        if (msg.value > amountETH) TransferHelper.safeTransferETH(msg.sender, msg.value - amountETH);
    }
    
    function addLiquidityALMandUSDC(
        address USDC,
        address WALM,
        uint idOfALM,
        uint amountUSDCDesired,
        uint amountALMDesired,
        uint amountUSDCMin,
        uint amountALMMin,
        address to,
        uint deadline
    ) external virtual override ensure(deadline) returns (uint amountUSDC, uint amountALM, uint liquidity) {
        (amountUSDC, amountALM) = _addLiquidity(
            USDC,
            WALM,
            amountUSDCDesired,
            amountALMDesired,
            amountUSDCMin,
            amountALMMin
        );
        address pair = UniswapV2Library.pairFor(factory, USDC, WALM);

        TransferHelper.safeTransferFrom(USDC, msg.sender, pair, amountUSDC);

        // IERC20(WETH).deposit{value: amountETH}();
        //need to make an appropriate TrasnsferHelper function that supports ERC1155 trasnfer
        IERC1155(ALM).safeTransferFrom(msg.sender, WALM, idOfALM, amountALM, " ");
        
        // assert(IERC20(WETH).transfer(pair, amountETH));
        TransferHelper.safeTransfer(WALM, pair, amountALM);

        liquidity = IUniswapV2Pair(pair).mint(to);
    }
    
    // **** REMOVE LIQUIDITY ****
    function removeLiquidity(
        address tokenA,
        address tokenB,
        uint liquidity,
        uint amountAMin,
        uint amountBMin,
        address to,
        uint deadline
    ) public virtual override ensure(deadline) returns (uint amountA, uint amountB) {
        address pair = UniswapV2Library.pairFor(factory, tokenA, tokenB);
        IUniswapV2Pair(pair).transferFrom(msg.sender, pair, liquidity); // send liquidity to pair
        (uint amount0, uint amount1) = IUniswapV2Pair(pair).burn(to);
        (address token0,) = UniswapV2Library.sortTokens(tokenA, tokenB);
        (amountA, amountB) = tokenA == token0 ? (amount0, amount1) : (amount1, amount0);
        require(amountA >= amountAMin, 'UniswapV2Router: INSUFFICIENT_A_AMOUNT');
        require(amountB >= amountBMin, 'UniswapV2Router: INSUFFICIENT_B_AMOUNT');
    }
    function removeLiquidityETH(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline
    ) public virtual override ensure(deadline) returns (uint amountToken, uint amountETH) {
        (amountToken, amountETH) = removeLiquidity(
            token,
            WETH,
            liquidity,
            amountTokenMin,
            amountETHMin,
            address(this),
            deadline
        );
        TransferHelper.safeTransfer(token, to, amountToken);
        IWETH(WETH).withdraw(amountETH);
        TransferHelper.safeTransferETH(to, amountETH);
    }
    function removeLiquidityUSDCandALM(
        address USDC,
        address WALM,
        uint idOfALM,
        uint liquidity,
        uint amountUSDCMin,
        uint amountALMMin,
        address to,
        uint deadline
    ) public virtual override ensure(deadline) returns (uint amountUSDC, uint amountALM) {
        (amountUSDC, amountALM) = removeLiquidity(
            USDC,
            WALM,
            liquidity,
            amountUSDCMin,
            amountALMMin,
            address(this),
            deadline
        );
        TransferHelper.safeTransfer(USDC, to, amountUSDC);
        //IWETH(WETH).withdraw(amountETH);
        IERC20(WALM).withdraw(amountALM);
        //TransferHelper.safeTransferETH(to, amountETH);
        IERC1155(ALM).safeTransferFrom(address(this), to, idOfALM, amountALM, " ");
    }
    function removeLiquidityWithPermit(
        address tokenA,
        address tokenB,
        uint liquidity,
        uint amountAMin,
        uint amountBMin,
        address to,
        uint deadline,
        bool approveMax, uint8 v, bytes32 r, bytes32 s
    ) external virtual override returns (uint amountA, uint amountB) {
        address pair = UniswapV2Library.pairFor(factory, tokenA, tokenB);
        uint value = approveMax ? uint(-1) : liquidity;
        IUniswapV2Pair(pair).permit(msg.sender, address(this), value, deadline, v, r, s);
        (amountA, amountB) = removeLiquidity(tokenA, tokenB, liquidity, amountAMin, amountBMin, to, deadline);
    }
    function removeLiquidityETHWithPermit(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline,
        bool approveMax, uint8 v, bytes32 r, bytes32 s
    ) external virtual override returns (uint amountToken, uint amountETH) {
        address pair = UniswapV2Library.pairFor(factory, token, WETH);
        uint value = approveMax ? uint(-1) : liquidity;
        IUniswapV2Pair(pair).permit(msg.sender, address(this), value, deadline, v, r, s);
        (amountToken, amountETH) = removeLiquidityETH(token, liquidity, amountTokenMin, amountETHMin, to, deadline);
    }

    // **** REMOVE LIQUIDITY (supporting fee-on-transfer tokens) ****
    function removeLiquidityETHSupportingFeeOnTransferTokens(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline
    ) public virtual override ensure(deadline) returns (uint amountETH) {
        (, amountETH) = removeLiquidity(
            token,
            WETH,
            liquidity,
            amountTokenMin,
            amountETHMin,
            address(this),
            deadline
        );
        TransferHelper.safeTransfer(token, to, IERC20(token).balanceOf(address(this)));
        IWETH(WETH).withdraw(amountETH);
        TransferHelper.safeTransferETH(to, amountETH);
    }
    function removeLiquidityETHWithPermitSupportingFeeOnTransferTokens(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline,
        bool approveMax, uint8 v, bytes32 r, bytes32 s
    ) external virtual override returns (uint amountETH) {
        address pair = UniswapV2Library.pairFor(factory, token, WETH);
        uint value = approveMax ? uint(-1) : liquidity;
        IUniswapV2Pair(pair).permit(msg.sender, address(this), value, deadline, v, r, s);
        amountETH = removeLiquidityETHSupportingFeeOnTransferTokens(
            token, liquidity, amountTokenMin, amountETHMin, to, deadline
        );
    }

    // **** SWAP ****
    // requires the initial amount to have already been sent to the first pair
    function _swap(uint[] memory amounts, address[] memory path, address _to) internal virtual {
        for (uint i; i < path.length - 1; i++) {
            (address input, address output) = (path[i], path[i + 1]);
            (address token0,) = UniswapV2Library.sortTokens(input, output);
            uint amountOut = amounts[i + 1];
            (uint amount0Out, uint amount1Out) = input == token0 ? (uint(0), amountOut) : (amountOut, uint(0));
            address to = i < path.length - 2 ? UniswapV2Library.pairFor(factory, output, path[i + 2]) : _to;
            IUniswapV2Pair(UniswapV2Library.pairFor(factory, input, output)).swap(
                amount0Out, amount1Out, to, new bytes(0)
            );
        }
    }
    function swapExactTokensForTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external virtual override ensure(deadline) returns (uint[] memory amounts) {
        amounts = UniswapV2Library.getAmountsOut(factory, amountIn, path);
        require(amounts[amounts.length - 1] >= amountOutMin, 'UniswapV2Router: INSUFFICIENT_OUTPUT_AMOUNT');
        TransferHelper.safeTransferFrom(
            path[0], msg.sender, UniswapV2Library.pairFor(factory, path[0], path[1]), amounts[0]
        );
        _swap(amounts, path, to);
    }
    function swapTokensForExactTokens(
        uint amountOut,
        uint amountInMax,
        address[] calldata path,
        address to,
        uint deadline
    ) external virtual override ensure(deadline) returns (uint[] memory amounts) {
        amounts = UniswapV2Library.getAmountsIn(factory, amountOut, path);
        require(amounts[0] <= amountInMax, 'UniswapV2Router: EXCESSIVE_INPUT_AMOUNT');
        TransferHelper.safeTransferFrom(
            path[0], msg.sender, UniswapV2Library.pairFor(factory, path[0], path[1]), amounts[0]
        );
        _swap(amounts, path, to);
    }
    function swapExactETHForTokens(uint amountOutMin, address[] calldata path, address to, uint deadline)
        external
        virtual
        override
        payable
        ensure(deadline)
        returns (uint[] memory amounts)
    {
        require(path[0] == WETH, 'UniswapV2Router: INVALID_PATH');
        amounts = UniswapV2Library.getAmountsOut(factory, msg.value, path);
        require(amounts[amounts.length - 1] >= amountOutMin, 'UniswapV2Router: INSUFFICIENT_OUTPUT_AMOUNT');
        IWETH(WETH).deposit{value: amounts[0]}();
        assert(IWETH(WETH).transfer(UniswapV2Library.pairFor(factory, path[0], path[1]), amounts[0]));
        _swap(amounts, path, to);
    }
    function swapExactALMforUSDC(
        uint amountOutMin,
        address[] calldata path, 
        address to, 
        uint deadline, 
        uint idOfALM, 
        address WALM,
        uint amountIn
        )
        external
        virtual
        override
        ensure(deadline)
        returns (uint[] memory amounts)
    {
        require(path[0] == WALM, 'UniswapV2Router: INVALID_PATH');
        amounts = UniswapV2Library.getAmountsOut(factory, amountIn, path);
        require(amounts[amounts.length - 1] >= amountOutMin, 'UniswapV2Router: INSUFFICIENT_OUTPUT_AMOUNT');
        //IWETH(WETH).deposit{value: amounts[0]}();
        IERC1155(ALM).safeTransferFrom(msg.sender, WALM, idOfALM, amounts[0], " ");
        //assert(IWETH(WETH).transfer(UniswapV2Library.pairFor(factory, path[0], path[1]), amounts[0]));
        TransferHelper.safeTransfer(WALM, UniswapV2Library.pairFor(factory, path[0], path[1]), amounts[0]);
        _swap(amounts, path, to);
    }
    function swapTokensForExactETH(uint amountOut, uint amountInMax, address[] calldata path, address to, uint deadline)
        external
        virtual
        override
        ensure(deadline)
        returns (uint[] memory amounts)
    {
        require(path[path.length - 1] == WETH, 'UniswapV2Router: INVALID_PATH');
        amounts = UniswapV2Library.getAmountsIn(factory, amountOut, path);
        require(amounts[0] <= amountInMax, 'UniswapV2Router: EXCESSIVE_INPUT_AMOUNT');
        TransferHelper.safeTransferFrom(
            path[0], msg.sender, UniswapV2Library.pairFor(factory, path[0], path[1]), amounts[0]
        );
        _swap(amounts, path, address(this));
        IWETH(WETH).withdraw(amounts[amounts.length - 1]);
        TransferHelper.safeTransferETH(to, amounts[amounts.length - 1]);
    }
    function swapExactTokensForETH(uint amountIn, uint amountOutMin, address[] calldata path, address to, uint deadline)
        external
        virtual
        override
        ensure(deadline)
        returns (uint[] memory amounts)
    {
        require(path[path.length - 1] == WETH, 'UniswapV2Router: INVALID_PATH');
        amounts = UniswapV2Library.getAmountsOut(factory, amountIn, path);
        require(amounts[amounts.length - 1] >= amountOutMin, 'UniswapV2Router: INSUFFICIENT_OUTPUT_AMOUNT');
        TransferHelper.safeTransferFrom(
            path[0], msg.sender, UniswapV2Library.pairFor(factory, path[0], path[1]), amounts[0]
        );
        _swap(amounts, path, address(this));
        IWETH(WETH).withdraw(amounts[amounts.length - 1]);
        TransferHelper.safeTransferETH(to, amounts[amounts.length - 1]);
    }
    function swapExactUSDCForALM(
        uint amountIn, 
        uint amountOutMin, 
        address[] calldata path, 
        address to,
        uint deadline,
        uint idOfALM, 
        address WALM
        )
        external
        virtual
        override
        ensure(deadline)
        returns (uint[] memory amounts)
    {
        require(path[path.length - 1] == WALM, 'UniswapV2Router: INVALID_PATH');
        amounts = UniswapV2Library.getAmountsOut(factory, amountIn, path);
        require(amounts[amounts.length - 1] >= amountOutMin, 'UniswapV2Router: INSUFFICIENT_OUTPUT_AMOUNT');
        TransferHelper.safeTransferFrom(
            path[0], msg.sender, UniswapV2Library.pairFor(factory, path[0], path[1]), amounts[0]
        );
        _swap(amounts, path, address(this));
        //IWETH(WETH).withdraw(amounts[amounts.length - 1]);
        IERC20(WALM).withdraw(amounts[amounts.length - 1]);
        //TransferHelper.safeTransferETH(to, amounts[amounts.length - 1]);
        IERC1155(ALM).safeTransferFrom(address(this), to, idOfALM, amounts[amounts.length - 1], " ");
    }
    function swapETHForExactTokens(uint amountOut, address[] calldata path, address to, uint deadline)
        external
        virtual
        override
        payable
        ensure(deadline)
        returns (uint[] memory amounts)
    {
        require(path[0] == WETH, 'UniswapV2Router: INVALID_PATH');
        amounts = UniswapV2Library.getAmountsIn(factory, amountOut, path);
        require(amounts[0] <= msg.value, 'UniswapV2Router: EXCESSIVE_INPUT_AMOUNT');
        IWETH(WETH).deposit{value: amounts[0]}();
        assert(IWETH(WETH).transfer(UniswapV2Library.pairFor(factory, path[0], path[1]), amounts[0]));
        _swap(amounts, path, to);
        // refund dust eth, if any
        if (msg.value > amounts[0]) TransferHelper.safeTransferETH(msg.sender, msg.value - amounts[0]);
    }

    // **** SWAP (supporting fee-on-transfer tokens) ****
    // requires the initial amount to have already been sent to the first pair
    function _swapSupportingFeeOnTransferTokens(address[] memory path, address _to) internal virtual {
        for (uint i; i < path.length - 1; i++) {
            (address input, address output) = (path[i], path[i + 1]);
            (address token0,) = UniswapV2Library.sortTokens(input, output);
            IUniswapV2Pair pair = IUniswapV2Pair(UniswapV2Library.pairFor(factory, input, output));
            uint amountInput;
            uint amountOutput;
            { // scope to avoid stack too deep errors
            (uint reserve0, uint reserve1,) = pair.getReserves();
            (uint reserveInput, uint reserveOutput) = input == token0 ? (reserve0, reserve1) : (reserve1, reserve0);
            amountInput = IERC20(input).balanceOf(address(pair)).sub(reserveInput);
            amountOutput = UniswapV2Library.getAmountOut(amountInput, reserveInput, reserveOutput);
            }
            (uint amount0Out, uint amount1Out) = input == token0 ? (uint(0), amountOutput) : (amountOutput, uint(0));
            address to = i < path.length - 2 ? UniswapV2Library.pairFor(factory, output, path[i + 2]) : _to;
            pair.swap(amount0Out, amount1Out, to, new bytes(0));
        }
    }
    function swapExactTokensForTokensSupportingFeeOnTransferTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external virtual override ensure(deadline) {
        TransferHelper.safeTransferFrom(
            path[0], msg.sender, UniswapV2Library.pairFor(factory, path[0], path[1]), amountIn
        );
        uint balanceBefore = IERC20(path[path.length - 1]).balanceOf(to);
        _swapSupportingFeeOnTransferTokens(path, to);
        require(
            IERC20(path[path.length - 1]).balanceOf(to).sub(balanceBefore) >= amountOutMin,
            'UniswapV2Router: INSUFFICIENT_OUTPUT_AMOUNT'
        );
    }
    function swapExactETHForTokensSupportingFeeOnTransferTokens(
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    )
        external
        virtual
        override
        payable
        ensure(deadline)
    {
        require(path[0] == WETH, 'UniswapV2Router: INVALID_PATH');
        uint amountIn = msg.value;
        IWETH(WETH).deposit{value: amountIn}();
        assert(IWETH(WETH).transfer(UniswapV2Library.pairFor(factory, path[0], path[1]), amountIn));
        uint balanceBefore = IERC20(path[path.length - 1]).balanceOf(to);
        _swapSupportingFeeOnTransferTokens(path, to);
        require(
            IERC20(path[path.length - 1]).balanceOf(to).sub(balanceBefore) >= amountOutMin,
            'UniswapV2Router: INSUFFICIENT_OUTPUT_AMOUNT'
        );
    }
    function swapExactTokensForETHSupportingFeeOnTransferTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    )
        external
        virtual
        override
        ensure(deadline)
    {
        require(path[path.length - 1] == WETH, 'UniswapV2Router: INVALID_PATH');
        TransferHelper.safeTransferFrom(
            path[0], msg.sender, UniswapV2Library.pairFor(factory, path[0], path[1]), amountIn
        );
        _swapSupportingFeeOnTransferTokens(path, address(this));
        uint amountOut = IERC20(WETH).balanceOf(address(this));
        require(amountOut >= amountOutMin, 'UniswapV2Router: INSUFFICIENT_OUTPUT_AMOUNT');
        IWETH(WETH).withdraw(amountOut);
        TransferHelper.safeTransferETH(to, amountOut);
    }

    // **** LIBRARY FUNCTIONS ****
    function quote(uint amountA, uint reserveA, uint reserveB) public pure virtual override returns (uint amountB) {
        return UniswapV2Library.quote(amountA, reserveA, reserveB);
    }

    function getAmountOut(uint amountIn, uint reserveIn, uint reserveOut)
        public
        pure
        virtual
        override
        returns (uint amountOut)
    {
        return UniswapV2Library.getAmountOut(amountIn, reserveIn, reserveOut);
    }

    function getAmountIn(uint amountOut, uint reserveIn, uint reserveOut)
        public
        pure
        virtual
        override
        returns (uint amountIn)
    {
        return UniswapV2Library.getAmountIn(amountOut, reserveIn, reserveOut);
    }

    function getAmountsOut(uint amountIn, address[] memory path)
        public
        view
        virtual
        override
        returns (uint[] memory amounts)
    {
        return UniswapV2Library.getAmountsOut(factory, amountIn, path);
    }

    function getAmountsIn(uint amountOut, address[] memory path)
        public
        view
        virtual
        override
        returns (uint[] memory amounts)
    {
        return UniswapV2Library.getAmountsIn(factory, amountOut, path);
    }

    //code to receive 1155
    function onERC1155Received(
        address operator,
        address from,
        uint256 id,
        uint256 value,
        bytes calldata data
    )
    external
    override
    returns(bytes4)
    {
        return ERC1155_ACCEPTED;
    }
       
    // will not accept batch tokens
    function onERC1155BatchReceived(
        address operator,
        address from,
        uint256[] calldata ids,
        uint256[] calldata values,
        bytes calldata data
    )
    external
    override
    returns(bytes4)
    {
        //ERC1155_BATCH_ACCEPTED;
    }   
    
    function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
        return  interfaceId == 0x01ffc9a7 || interfaceId == 0x4e2312e0;
    }
 }
diff --git a/Migrations.sol b/Migrations.sol
 // SPDX-License-Identifier: MIT

 pragma solidity ^0.8.0;

 contract Migrations {
  address public owner = msg.sender;
  uint public last_completed_migration;

  modifier restricted() {
    require(
      msg.sender == owner,
      "This function is restricted to the contract's owner"
    );
    _;
  }

  function setCompleted(uint completed) public restricted {
    last_completed_migration = completed;
  }
 }
diff --git a/Presale.sol b/Presale.sol
 // SPDX-License-Identifier: MIT

 pragma solidity ^0.8.0;

 import "./ALMToken.sol";
 import '@uniswap/lib/contracts/libraries/TransferHelper.sol';
 import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
 import "@openzeppelin/contracts/utils/math/SafeMath.sol";
 import "./Constants.sol";
 import "@openzeppelin/contracts/token/ERC1155/IERC1155Receiver.sol";

 contract Presale is IERC1155Receiver, CommonConstants{
    using SafeMath for uint256;
    
    event InitialOfferingCreated(uint256 tokenID, uint256 totalTokenOfferingAmount, uint256 pricePerTokenInUSDC, uint256 offeringStartTime, uint256 offeringEndTime);
    event InitalOfferingCancelled(uint256 tokenID, uint256 remainingTokenOfferingAmount, uint256 pricePerTokenInUSDC, uint256 offeringCancellationUnixTime);
    event RedeemedRemainingALM(uint256 tokenID, uint256 remainingTokenOfferingAmount, uint256 pricePerTokenInUSDC, uint256 redeemUnixTime);
    event ALMBought(uint256 tokenID, uint256 ALMAmount);

    address public USDCAddress;
    ALM public immutable ALMContract;
    
    address public preSaleOwner; //address that gets commision on sale
    uint256 public preSaleCommision; //can define these as immutable as Vuze will always take 5% commision
    uint256 public artistCommision; //can defined these as immutable 95% as Vuze will always take 5% commision
    
    struct Sale{
        bool onSale; //is offering still ongoing
        uint256 tokenPrice;
        uint256 offeringEndTime;
    }
    
    mapping(uint256 => Sale) public ALMSales; //ALM tokenID to sale
    
    /*
    @dev: _preSaleCommision and _artistCommision are padded with 100 as decimals.
        For 5% PreSale commision and 95% artistCommision params must be
        500 and 9500
    */

    constructor(address _USDCAddress, address _ALMContract, uint256 _preSaleCommision, uint256 _artistCommision) public {
        USDCAddress = _USDCAddress;
        ALMContract = ALM(_ALMContract);
        preSaleOwner = msg.sender;
        require(_preSaleCommision + _artistCommision == 10000, "PreSale: Sum of commisions must be 100%");
        preSaleCommision = _preSaleCommision;
        artistCommision = _artistCommision;
    }
    
    // LIMIT OF MINIM AMOUNT?
    //For now price != 0
    modifier checkPrice(uint256 _pricePerTokenInUSDC) {
        require(_pricePerTokenInUSDC != 0, "PreSale: VZEPrice should be greater than 1");
        _;
    }
    
    ///@notice create album tokens offer
    ///@param _tokenID tokenID to initilize presale offer 
    ///@param _pricePerTokenInUSDC price of the token for presale
    ///@param _offeringEndUnixTime ending time of token presale
    function initializeOffering(
        uint256 _tokenID, 
        uint256 _pricePerTokenInUSDC, 
        uint256 _offeringEndUnixTime
        ) public checkPrice(_pricePerTokenInUSDC) {
            
        //CurrentTime time is stored and used so the increase of block.timestamp while txn is processing is removed.
        uint256 currentTime = block.timestamp;
        ALM.AlbumExtraInfo memory albumInfo = ALMContract.getAlbumExtraInfo(_tokenID);

        require(
            currentTime < _offeringEndUnixTime,
            "PreSale: OfferingEndUnixTime cannot be a time of the past i.e _offeringEndUnixTime < currentTime"
            );
        
        // check if the sender is artist .
        require(
            albumInfo.artist == msg.sender,
            "PreSale: Sender is not artist."
            );
        
        // check if offering has already been created
        require(
            ALMSales[_tokenID].tokenPrice == 0,
            "PreSale: Offering for this tokenID has already been created."
            );

        // Assumption that the offering period starts as soon as the this txm is completed. Can be changed accordingly.
        ALMSales[_tokenID] = Sale({
            onSale: true,
            tokenPrice: _pricePerTokenInUSDC,
            offeringEndTime:_offeringEndUnixTime
        });
        
        emit InitialOfferingCreated(_tokenID, albumInfo.totalCap, _pricePerTokenInUSDC, currentTime, _offeringEndUnixTime);
            
    }

    ///@notice cancel the Album token sale Offer
    ///@param _tokenID tokenID to cancel offer 
    function cancelOffering(uint256 _tokenID) public {
        
        Sale storage sale = ALMSales[_tokenID];
        uint256 currentTime = block.timestamp;
        ALM.AlbumExtraInfo memory albumInfo = ALMContract.getAlbumExtraInfo(_tokenID);    

        require(
            currentTime < sale.offeringEndTime,
            "PreSale: Offering already ended, cannot cancel closed offering"
        );
            
        require(
            sale.onSale == true,
            "PreSale: Offering already cancelled"
        );

        require(
            albumInfo.artist == msg.sender,
            "PreSale: Sender is not artist."
        );
    
        //Do we need to address delay in txn processing? If so we can do block.timestamp < sale.offeringEndTime -10 sec, assuming it takes 10 sec after this for txn to complete.
        sale.onSale = false;
        
        uint256 remainingALM = ALMContract.balanceOf(address(this), _tokenID);

        //transfer reamaining ALM back to the artist
        ALMContract.safeTransferFrom(address(this), msg.sender, _tokenID, remainingALM, " ");

        emit InitalOfferingCancelled(_tokenID, remainingALM, sale.tokenPrice, currentTime);
        
    }

    ///@notice redeem remaining ALM after presale ended
    ///@param _tokenID tokenID to cancel offer 
    function redeemRemainingALM(uint256 _tokenID) public {
        
        Sale storage sale = ALMSales[_tokenID];
        uint256 currentTime = block.timestamp;
        ALM.AlbumExtraInfo memory albumInfo = ALMContract.getAlbumExtraInfo(_tokenID);    

        require(
            currentTime > sale.offeringEndTime,
            "PreSale: Offering not yet ended"
        );
            
        require(
            albumInfo.artist == msg.sender,
            "PreSale: Sender is not artist."
        );
    
        sale.onSale = false;
        
        uint256 remainingALM = ALMContract.balanceOf(address(this), _tokenID);

        //transfer reamaining ALM back to the artist
        ALMContract.safeTransferFrom(address(this), msg.sender, _tokenID, remainingALM, " ");

        emit RedeemedRemainingALM(_tokenID, remainingALM, sale.tokenPrice, currentTime);
        
    }

    ///@notice create album tokens offer instantly after minintg the nft
    ///@param _tokenID tokenID to initilize presale offer 
    ///@param _pricePerTokenInUSDC price of the token for presale
    ///@param _offeringEndUnixTime ending time of token presale
    function instantInitializeOffering(
        uint256 _tokenID, 
        uint256 _pricePerTokenInUSDC, 
        uint256 _offeringEndUnixTime,
        uint256 _tokenTotalCap
        ) public checkPrice(_pricePerTokenInUSDC) returns(bool){

            uint256 currentTime = block.timestamp;

            require(
            msg.sender == address(ALMContract),
            "PreSale: Only ALM contract can call this function"
            );

            require(
            currentTime < _offeringEndUnixTime,
            "PreSale: OfferingEndUnixTime cannot be a time of the past i.e _offeringEndUnixTime < currentTime"
            );

            // check if offering has already been created
            require(
            ALMSales[_tokenID].tokenPrice == 0,
            "PreSale: Offering for this tokenID has already been created."
            );

            ALMSales[_tokenID] = Sale({
            onSale: true,
            tokenPrice: _pricePerTokenInUSDC,
            offeringEndTime:_offeringEndUnixTime
            });

            emit InitialOfferingCreated(_tokenID, _tokenTotalCap, _pricePerTokenInUSDC, currentTime, _offeringEndUnixTime);
            return true;
    }

    ///@notice buy ALM tokens
    ///@param _tokenID tokenID 
    ///@param _amountOfUSDCToBuyWith amount of USDC tokens to spend
    function buyALM(uint256 _tokenID, uint256 _amountOfUSDCToBuyWith) public {
        
        Sale storage sale = ALMSales[_tokenID];
        ALM.AlbumExtraInfo memory albumInfo = ALMContract.getAlbumExtraInfo(_tokenID);    
           
        require(
            sale.onSale != false,
            "PreSale: Offering not initialized"
        );     
        
        require(
            block.timestamp < sale.offeringEndTime,
            "PreSale: Offering already ended"
        );
        
        //Offering can be cancelled earlier to offeringEndTime so need to check if cancelled
        require(
            ALMSales[_tokenID].onSale == true,
            "PreSale: Offering already over/canceled"
        );
        
        require(
            IERC20(USDCAddress).allowance(msg.sender, address(this)) >= _amountOfUSDCToBuyWith,
            "PreSale: PreSale not set as approved address for USDc token"
        );
        
        //calculate ALM amount that can be bought with USDC amount
        uint256 ALMToBuy = _amountOfUSDCToBuyWith.div(sale.tokenPrice);
        
        require(
            ALMToBuy >= 1,
            "PreSale: PreSale insufficient USDC token to buy ALM"
        );        

        //checks if ALMToBuy with is available i.e checkBalanceOf(address(this))
        //but this will adds more gas

        //calucate portion of amount used to purchase ALM
        uint256 _amountOfUSDCToUse = (_amountOfUSDCToBuyWith.div(sale.tokenPrice)).mul(sale.tokenPrice);
        
        // calculate commissions
        (
            uint256 _preSaleCommission,
            uint256 _artistUSDCTokens
        ) = calculateCommissions(_amountOfUSDCToUse); 
        
        //transfer ALM to msg.sender
        ALMContract.safeTransferFrom(address(this), msg.sender, _tokenID, ALMToBuy, " ");
        // ALMContract.mintAlbumTokens(msg.sender, ALMToBuy, _tokenID);
        
        //transfer USDC to artist from msg.sender
        TransferHelper.safeTransferFrom(USDCAddress, msg.sender, albumInfo.artist, _artistUSDCTokens);

        //transfer USDC to preSaleOwner from msg.sender
        TransferHelper.safeTransferFrom(USDCAddress, msg.sender, preSaleOwner, _preSaleCommission);

        emit ALMBought(_tokenID, ALMToBuy);
    }
      
    function calculateCommissions(uint256 _amount)
        internal
        view
        returns (
            uint256 _preSaleCommission,
            uint256 _artistUSDCTokens
        )
    {
        uint256 _preSaleCommission = cutPer10000(preSaleCommision, _amount); 
        return (
            _preSaleCommission,
            _amount.sub(_preSaleCommission)
        );
    }

    function cutPer10000(uint256 _cut, uint256 _total)
        internal
        pure
        returns (uint256)
    {
        uint256 cutAmount = _total.mul(_cut).div(10000);
        return cutAmount;
    }

    //Fallback functions that allows contract to accept incoming 1155

    function onERC1155Received(
        address operator,
        address from,
        uint256 id,
        uint256 value,
        bytes calldata data
    )
    external
    override
    returns(bytes4)
    {
        return ERC1155_ACCEPTED;
    }
        
    function onERC1155BatchReceived(
        address operator,
        address from,
        uint256[] calldata ids,
        uint256[] calldata values,
        bytes calldata data
    )
    external
    override
    returns(bytes4)
    {
        ERC1155_BATCH_ACCEPTED;
    }
        
    function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
        return  interfaceId == 0x01ffc9a7 || interfaceId == 0x4e2312e0;
    }
 }
diff --git a/WALM.sol b/WALM.sol
 // SPDX-License-Identifier: MIT

 pragma solidity ^0.8.0;

 import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
 import "@openzeppelin/contracts/token/ERC1155/IERC1155Receiver.sol";
 import "@openzeppelin/contracts/token/ERC1155/IERC1155.sol";
 import "./Constants.sol";

 contract WALM is ERC20, IERC1155Receiver, CommonConstants {

    event  Withdrawal(address indexed src, uint wad, uint idOfALM);

    address public ALM;
    uint256 public idOfALM;
    
    constructor(string memory _name, string memory _symbol, address _ALM, uint _id) public ERC20(_name, _symbol) {
        ALM = _ALM;
        idOfALM = _id;
    }

    function decimals() public view virtual override returns (uint8) {
        return 0;
    }

    function mint(address operator, uint256 amount) public virtual {
        _mint(operator, amount);
    }

    function burn(address operator, uint256 amount) public virtual {
        _burn(operator, amount);
    }

    function withdraw(uint amountALM) public {
        require(
            balanceOf(msg.sender) >= amountALM,
            "WALM: Insufficeint withdrawal"
        );
        burn(msg.sender, amountALM);
        //transfer 1155
        IERC1155(ALM).safeTransferFrom(address(this), msg.sender, idOfALM, amountALM, " ");
        emit Withdrawal(msg.sender, amountALM, idOfALM);
    }
    //Fallback functions that allows contract to accept incoming 1155

    function onERC1155Received(
        address operator,
        address from,
        uint256 id,
        uint256 value,
        bytes calldata data
    )
    external
    override
    returns(bytes4)
    {
        //operator == msg.sender
        mint(operator, value);
        return ERC1155_ACCEPTED;
    }
        
    function onERC1155BatchReceived(
        address operator,
        address from,
        uint256[] calldata ids,
        uint256[] calldata values,
        bytes calldata data
    )
    external
    override
    returns(bytes4)
    {
        ERC1155_BATCH_ACCEPTED;
    }
        
    function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
        return  interfaceId == 0x01ffc9a7 || interfaceId == 0x4e2312e0;
    }

 }
diff --git a/weth.sol b/weth.sol
 pragma solidity ^0.4.18;

 contract WETH9 {
    string public name     = "Wrapped Ether";
    string public symbol   = "WETH";
    uint8  public decimals = 18;

    event  Approval(address indexed src, address indexed guy, uint wad);
    event  Transfer(address indexed src, address indexed dst, uint wad);
    event  Deposit(address indexed dst, uint wad);
    event  Withdrawal(address indexed src, uint wad);

    mapping (address => uint)                       public  balanceOf;
    mapping (address => mapping (address => uint))  public  allowance;

    function() public payable {
        deposit();
    }
    function deposit() public payable {
        balanceOf[msg.sender] += msg.value;
        Deposit(msg.sender, msg.value);
    }
    function withdraw(uint wad) public {
        require(balanceOf[msg.sender] >= wad);
        balanceOf[msg.sender] -= wad;
        msg.sender.transfer(wad);
        Withdrawal(msg.sender, wad);
    }

    function totalSupply() public view returns (uint) {
        return this.balance;
    }

    function approve(address guy, uint wad) public returns (bool) {
        allowance[msg.sender][guy] = wad;
        Approval(msg.sender, guy, wad);
        return true;
    }

    function transfer(address dst, uint wad) public returns (bool) {
        return transferFrom(msg.sender, dst, wad);
    }

    function transferFrom(address src, address dst, uint wad)
        public
        returns (bool)
    {
        require(balanceOf[src] >= wad);

        if (src != msg.sender && allowance[src][msg.sender] != uint(-1)) {
            require(allowance[src][msg.sender] >= wad);
            allowance[src][msg.sender] -= wad;
        }

        balanceOf[src] -= wad;
        balanceOf[dst] += wad;

        Transfer(src, dst, wad);

        return true;
    }
 }
	pragma solidity ^0.8.0;

	import "@openzeppelin/contracts/token/ERC1155/ERC1155.sol";
	import "@openzeppelin/contracts/utils/Counters.sol";
	import "@openzeppelin/contracts/access/AccessControl.sol";
	import "@openzeppelin/contracts/utils/math/SafeMath.sol";
	import "./WALM.sol";
	import "./Presale.sol";
	import "@openzeppelin/contracts/token/ERC20/IERC20.sol";

	contract ALM is ERC1155, AccessControl{
	using Counters for Counters.Counter;
	using SafeMath for uint256;

	event AlbumCreated(address owner, uint256 tokenId, uint256 totalMarketCap, string _albumId, address ercTokenAddress);
	event AlbumTokenMinted(address user, uint256 tokenId, uint256 amount);

	Counters.Counter private _tokenIds; // tracks the token ids

	struct AlbumExtraInfo{
	address artist;
	uint256 totalCap;
	address ercTokenAddress;
	}
	/// maps the token id to the total cap
	mapping(uint256 => AlbumExtraInfo) public albumMetadata;

	Presale public preSaleContract;

	constructor() ERC1155("https://game.example/api/item/{id}.json") {
	_setupRole(DEFAULT_ADMIN_ROLE, msg.sender);
	}

	function supportsInterface(bytes4 interfaceId) public view virtual override(ERC1155, AccessControl) returns (bool) {
	return super.supportsInterface(interfaceId);
	}

	///@notice checks if caller has admin role
	modifier IsAdmin {
	require(
	this.hasRole(this.DEFAULT_ADMIN_ROLE(), msg.sender),
	"ALM: Caller must have ADMIN role"
	);
	_;
	}

	///@notice grants admin role to account
	///@param _account adress to be granted role
	function addAdmin(address _account) public IsAdmin {
	grantRole(DEFAULT_ADMIN_ROLE, _account);
	}

	///@notice set up the preSaleContract address
	///@param _preSale adress of the presale
	function setPreSaleContractAddress(
	address _preSale
	) public IsAdmin returns (bool){
	preSaleContract = Presale(_preSale);
	}


	///@notice creates album ALM token of an album
	///@param _owner address of the artist or album owner
	///@param _tokenTotalCap supply of ALM to be minted for presale
	///@param _albumId albumID of the album in spotify
	function createAlbum(
	address _owner,
	uint256 _tokenTotalCap,
	string memory _albumId,
	string memory _name,
	string memory _symbol
	) public returns (uint256){
	_tokenIds.increment();
	uint256 newItemId = _tokenIds.current();
	uint256 totalALM = 1000000;
	address _ercTokenAddress = deploy(_name, _symbol, newItemId);

	albumMetadata[newItemId] = AlbumExtraInfo({
	artist: _owner,
	totalCap: _tokenTotalCap,
	ercTokenAddress: _ercTokenAddress
	});
	address _preSaleContract = address(preSaleContract);
	_mint(_preSaleContract, newItemId, _tokenTotalCap, " ");
	_mint(_owner, newItemId, totalALM.sub(_tokenTotalCap), " ");
	emit AlbumCreated(_owner, newItemId, _tokenTotalCap, _albumId, _ercTokenAddress);
	return newItemId;
	}

	///@notice creates album ALM token of an album and initialized presale immediately
	///@param _owner address of the artist or album owner
	///@param _tokenTotalCap supply of ALM to be minted for presale
	///@param _albumId albumID of the album in spotify
	function createAlbumAndInitializePresale(
	address _owner,
	uint256 _tokenTotalCap,
	string memory _albumId,
	string memory _name,
	string memory _symbol,
	uint256 _pricePerTokenInUSDC,
	uint256 _offeringEndUnixTime
	) public returns (uint256){
	_tokenIds.increment();
	uint256 newItemId = _tokenIds.current();
	uint256 totalALM = 1000000;
	address _ercTokenAddress = deploy(_name, _symbol, newItemId);

	albumMetadata[newItemId] = AlbumExtraInfo({
	artist: _owner,
	totalCap: _tokenTotalCap,
	ercTokenAddress: _ercTokenAddress
	});

	address _preSaleContract = address(preSaleContract);
	_mint(_preSaleContract, newItemId, _tokenTotalCap, " ");
	_mint(_owner, newItemId, totalALM.sub(_tokenTotalCap), " ");

	require(preSaleContract.instantInitializeOffering(newItemId, _pricePerTokenInUSDC, _offeringEndUnixTime, _tokenTotalCap),"ALM: Unable to initialize offering");
	emit AlbumCreated(_owner, newItemId, _tokenTotalCap, _albumId, _ercTokenAddress );
	return newItemId;
	}

	/*
	///@notice create ERC20 token for an album and deploy
	///@dev Create and Deploy ERC20 tokens for an album and deploys it.
	///It set's the marketplace as the approved address for the tokenTotal supply.
	///@param _tokenTotalCap total ERC20 to be minted
	///@param _name name for the ERC20 token
	///@param _symbol symbol for the ERC20 token
	*/
	function deploy(string memory _name, string memory _symbol, uint256 _id) internal returns (address){
	WALM fungibleToken = new WALM(_name, _symbol, address(this), _id);
	return address(fungibleToken);
	}

	///@notice returns extra info about the album
	///@param _tokenId tokenId of the ALM token
	function getAlbumExtraInfo(
	uint256 _tokenId
	) public view returns (AlbumExtraInfo memory){
	AlbumExtraInfo memory album = albumMetadata[_tokenId];
	return album;
	}

	function getAlbumERC20Token(uint256 _tokenId) public view returns(address){
	AlbumExtraInfo memory album = albumMetadata[_tokenId];
	address ad = album.ercTokenAddress;
	return ad;
	}

	function testCheckWALMBalance(address wal, address user) public view returns(uint256){
	uint256 balance = IERC20(wal).balanceOf(user);
	return balance;
	}

	///@notice returns number of tokens minted
	function getcurrentNFTCount() public view returns (uint256){
	uint256 currentItemId = _tokenIds.current();
	return currentItemId;
	}

	}
	// SPDX-License-Identifier: MIT

	pragma solidity >=0.6.6;


	/**
	Note: Simple contract to use as base for const vals
	*/
	contract CommonConstants {

	bytes4 constant internal ERC1155_ACCEPTED = 0xf23a6e61; // bytes4(keccak256("onERC1155Received(address,address,uint256,uint256,bytes)"))
	bytes4 constant internal ERC1155_BATCH_ACCEPTED = 0xbc197c81; // bytes4(keccak256("onERC1155BatchReceived(address,address,uint256[],uint256[],bytes)"))
	}
	pragma solidity >=0.5.0;

	interface IERC20 {
	event Approval(address indexed owner, address indexed spender, uint value);
	event Transfer(address indexed from, address indexed to, uint value);

	function name() external view returns (string memory);
	function symbol() external view returns (string memory);
	function decimals() external view returns (uint8);
	function totalSupply() external view returns (uint);
	function balanceOf(address owner) external view returns (uint);
	function allowance(address owner, address spender) external view returns (uint);

	function approve(address spender, uint value) external returns (bool);
	function transfer(address to, uint value) external returns (bool);
	function transferFrom(address from, address to, uint value) external returns (bool);
	}
	pragma solidity >=0.5.0;

	interface IUniswapV2Callee {
	function uniswapV2Call(address sender, uint amount0, uint amount1, bytes calldata data) external;
	}
	pragma solidity >=0.5.0;

	interface IUniswapV2ERC20 {
	event Approval(address indexed owner, address indexed spender, uint value);
	event Transfer(address indexed from, address indexed to, uint value);

	function name() external pure returns (string memory);
	function symbol() external pure returns (string memory);
	function decimals() external pure returns (uint8);
	function totalSupply() external view returns (uint);
	function balanceOf(address owner) external view returns (uint);
	function allowance(address owner, address spender) external view returns (uint);

	function approve(address spender, uint value) external returns (bool);
	function transfer(address to, uint value) external returns (bool);
	function transferFrom(address from, address to, uint value) external returns (bool);

	function DOMAIN_SEPARATOR() external view returns (bytes32);
	function PERMIT_TYPEHASH() external pure returns (bytes32);
	function nonces(address owner) external view returns (uint);

	function permit(address owner, address spender, uint value, uint deadline, uint8 v, bytes32 r, bytes32 s) external;
	}
	pragma solidity >=0.5.0;

	interface IUniswapV2Factory {
	event PairCreated(address indexed token0, address indexed token1, address pair, uint);

	function feeTo() external view returns (address);
	function feeToSetter() external view returns (address);

	function getPair(address tokenA, address tokenB) external view returns (address pair);
	function allPairs(uint) external view returns (address pair);
	function allPairsLength() external view returns (uint);

	function createPair(address tokenA, address tokenB) external returns (address pair);

	function setFeeTo(address) external;
	function setFeeToSetter(address) external;
	}
	pragma solidity >=0.5.0;

	interface IUniswapV2Pair {
	event Approval(address indexed owner, address indexed spender, uint value);
	event Transfer(address indexed from, address indexed to, uint value);

	function name() external pure returns (string memory);
	function symbol() external pure returns (string memory);
	function decimals() external pure returns (uint8);
	function totalSupply() external view returns (uint);
	function balanceOf(address owner) external view returns (uint);
	function allowance(address owner, address spender) external view returns (uint);

	function approve(address spender, uint value) external returns (bool);
	function transfer(address to, uint value) external returns (bool);
	function transferFrom(address from, address to, uint value) external returns (bool);

	function DOMAIN_SEPARATOR() external view returns (bytes32);
	function PERMIT_TYPEHASH() external pure returns (bytes32);
	function nonces(address owner) external view returns (uint);

	function permit(address owner, address spender, uint value, uint deadline, uint8 v, bytes32 r, bytes32 s) external;

	event Mint(address indexed sender, uint amount0, uint amount1);
	event Burn(address indexed sender, uint amount0, uint amount1, address indexed to);
	event Swap(
	address indexed sender,
	uint amount0In,
	uint amount1In,
	uint amount0Out,
	uint amount1Out,
	address indexed to
	);
	event Sync(uint112 reserve0, uint112 reserve1);

	function MINIMUM_LIQUIDITY() external pure returns (uint);
	function factory() external view returns (address);
	function token0() external view returns (address);
	function token1() external view returns (address);
	function getReserves() external view returns (uint112 reserve0, uint112 reserve1, uint32 blockTimestampLast);
	function price0CumulativeLast() external view returns (uint);
	function price1CumulativeLast() external view returns (uint);
	function kLast() external view returns (uint);

	function mint(address to) external returns (uint liquidity);
	function burn(address to) external returns (uint amount0, uint amount1);
	function swap(uint amount0Out, uint amount1Out, address to, bytes calldata data) external;
	function skim(address to) external;
	function sync() external;

	function initialize(address, address) external;
	}
	pragma solidity >=0.5.0;
	//pragma solidity =0.5.16;

	// a library for performing various math operations

	library Math {
	function min(uint x, uint y) internal pure returns (uint z) {
	z = x < y ? x : y;
	}

	// babylonian method (https://en.wikipedia.org/wiki/Methods_of_computing_square_roots#Babylonian_method)
	function sqrt(uint y) internal pure returns (uint z) {
	if (y > 3) {
	z = y;
	uint x = y / 2 + 1;
	while (x < z) {
	z = x;
	x = (y / x + x) / 2;
	}
	} else if (y != 0) {
	z = 1;
	}
	}
	}
	pragma solidity >=0.5.0;
	//pragma solidity =0.5.16;

	// a library for performing overflow-safe math, courtesy of DappHub (https://github.com/dapphub/ds-math)

	library SafeMath {
	function add(uint x, uint y) internal pure returns (uint z) {
	require((z = x + y) >= x, 'ds-math-add-overflow');
	}

	function sub(uint x, uint y) internal pure returns (uint z) {
	require((z = x - y) <= x, 'ds-math-sub-underflow');
	}

	function mul(uint x, uint y) internal pure returns (uint z) {
	require(y == 0 \|\| (z = x * y) / y == x, 'ds-math-mul-overflow');
	}
	}
	pragma solidity >=0.5.0;
	//pragma solidity =0.5.16;

	// a library for handling binary fixed point numbers (https://en.wikipedia.org/wiki/Q_(number_format))

	// range: [0, 2**112 - 1]
	// resolution: 1 / 2**112

	library UQ112x112 {
	uint224 constant Q112 = 2**112;

	// encode a uint112 as a UQ112x112
	function encode(uint112 y) internal pure returns (uint224 z) {
	z = uint224(y) * Q112; // never overflows
	}

	// divide a UQ112x112 by a uint112, returning a UQ112x112
	function uqdiv(uint224 x, uint112 y) internal pure returns (uint224 z) {
	z = x / uint224(y);
	}
	}