.sol

/*
Implements EIP20 token standard: https://github.com/ethereum/EIPs/issues/20
.*/
pragma solidity >=0.4.21 <0.7.0;

import "../installed_contracts/tokens/contracts/eip20/EIP20Interface.sol";

contract WWTtoken is EIP20Interface {

    uint256 constant MAX_UINT256 = 2**256 - 1;

    /*
    NOTE:
    The following variables are OPTIONAL vanities. One does not have to include them.
    They allow one to customise the token contract & in no way influences the core functionality.
    Some wallets/interfaces might not even bother to look at this information.
    */
    string public name;                   //fancy name: eg Simon Bucks
    uint8 public decimals;                //How many decimals to show.
    string public symbol;                 //An identifier: eg SBX

     constructor(
        uint256 _initialAmount,
        string memory _tokenName,
        uint8 _decimalUnits,
        string memory _tokenSymbol
        ) public {
        balances[msg.sender] = _initialAmount;               // Give the creator all initial tokens
        totalSupply = _initialAmount;                        // Update total supply
        name = _tokenName;                                   // Set the name for display purposes
        decimals = _decimalUnits;                            // Amount of decimals for display purposes
        symbol = _tokenSymbol;                               // Set the symbol for display purposes
    }

    function transfer(address _to, uint256 _value) public returns (bool success) {
        //Default assumes totalSupply can't be over max (2^256 - 1).
        //If your token leaves out totalSupply and can issue more tokens as time goes on, you need to check if it doesn't wrap.
        //Replace the if with this one instead.
        //require(balances[msg.sender] >= _value && balances[_to] + _value > balances[_to]);
        require(balances[msg.sender] >= _value);
        balances[msg.sender] -= _value;
        balances[_to] += _value;
        emit Transfer(msg.sender, _to, _value);
        return true;
    }

    function transferFrom(address _from, address _to, uint256 _value) public returns (bool success) {
        //same as above. Replace this line with the following if you want to protect against wrapping uints.
        //require(balances[_from] >= _value && allowed[_from][msg.sender] >= _value && balances[_to] + _value > balances[_to]);
        // need to invoke approve first
        // It allows a delegate approved for withdrawal to transfer owner/_from funds to a third-party account _to
        // in our case it will essentially allow the contract address/creator and holder of original tokens to send tokens from one address to another
        uint256 allowance = allowed[_from][msg.sender];
        require(balances[_from] >= _value && allowance >= _value);
        balances[_to] += _value;
        balances[_from] -= _value;
        if (allowance < MAX_UINT256) {
            allowed[_from][msg.sender] -= _value;
        }
        emit Transfer(_from, _to, _value);
        return true;
    }

    function balanceOf(address _owner) view public returns (uint256 balance) {
        return balances[_owner];
    }

    // need t
    function approve(address _delegate, uint256 _value) public returns (bool success) {
        allowed[msg.sender][_delegate] = _value;
        emit Approval(msg.sender, _delegate, _value);
        return true;
    }

    function allowance(address _owner, address _delegate)
    view public returns (uint256 remaining) {
      return allowed[_owner][_delegate];
    }

    function getTotalSupply() public view returns (uint256) {
        return totalSupply;
    }

    mapping (address => uint256) balances;
    mapping (address => mapping (address => uint256)) allowed;
}