sharedaccount.sol

pragma solidity ^0.4.18;

contract SharedAccount {
    // Owner takes all the money.
    // Owner can close account and share the balance with all accounts.
    // Owner can change owner.
    
    struct AccountBalance {
        address addr;
        uint balance;
        bool isActive;
    }
    
    mapping(address => AccountBalance) accounts;
    
    uint maxAccountCount;
    uint public numberOfAccounts;
    
    function SharedAccount(uint _maxAccountCount) public {
        if(_maxAccountCount != 0) {
            maxAccountCount = _maxAccountCount;
        } else {
            maxAccountCount = 128;
        }
    }
    
    function openAccount() payable public {
        require(!isAccountExists(msg.sender)); // modifier ile yapilir mi?
        require(numberOfAccounts < maxAccountCount); // modifier ile yapilir mi?
        
        accounts[msg.sender] = AccountBalance(msg.sender, msg.value, true);
        numberOfAccounts++;
    }
    
    function withdrawMoney(uint amount) public {
        require(isAccountExists(msg.sender)); // modifier ile yapilir mi?
        require(accounts[msg.sender].balance >= amount); // modifier ile yapilir mi?
        
        msg.sender.transfer(amount);
        accounts[msg.sender].balance -= amount;
    }
    
    function depositMoney() payable public {
        require(isAccountExists(msg.sender));  // modifier ile yapilir mi?
        accounts[msg.sender].balance += msg.value;
    }
    
    function isAccountExists(address accountOwner) private returns (bool) {
        return accounts[accountOwner].addr != address(0) && accounts[accountOwner].isActive;
    }
}