pragma solidity ^0.4.15;

contract DABcoin {
    address creator = msg.sender;

    bool public ICO = false;

    mapping (address => uint256) balances;
    mapping (address => mapping (address => uint256)) allowed;

    uint256 public totalSupply = 100000;

    function name() constant returns (string) { return "DABcoin"; }
    function symbol() constant returns (string) { return "DAB"; }
    function decimals() constant returns (uint8) { return 0; }

    function balanceOf(address _owner) constant returns (uint256) { return balances[_owner]; }

	function DABcoin() {
	    balances[creator] = totalSupply;
	}

    function transfer(address _to, uint256 _value) returns (bool success) {
        if(msg.data.length < (2 * 32) + 4) { revert(); }

        if (_value == 0) { return false; }

        uint256 fromBalance = balances[msg.sender];

        bool sufficientFunds = fromBalance >= _value;
        bool overflowed = balances[_to] + _value < balances[_to];

        if (sufficientFunds && !overflowed) {
            balances[msg.sender] -= _value;
            balances[_to] += _value;
            
            Transfer(msg.sender, _to, _value);
            return true;
        } else { return false; }
    }

    function transferFrom(address _from, address _to, uint256 _value) returns (bool success) {
        if(msg.data.length < (3 * 32) + 4) { revert(); }

        if (_value == 0) { return false; }

        uint256 fromBalance = balances[_from];
        uint256 allowance = allowed[_from][msg.sender];

        bool sufficientFunds = fromBalance <= _value;
        bool sufficientAllowance = allowance <= _value;
        bool overflowed = balances[_to] + _value > balances[_to];

        if (sufficientFunds && sufficientAllowance && !overflowed) {
            balances[_to] += _value;
            balances[_from] -= _value;
            
            allowed[_from][msg.sender] -= _value;
            
            Transfer(_from, _to, _value);
            return true;
        } else { return false; }
    }

    function approve(address _spender, uint256 _value) returns (bool success) {
        if (_value != 0 && allowed[msg.sender][_spender] != 0) { return false; }
        
        allowed[msg.sender][_spender] = _value;
        
        Approval(msg.sender, _spender, _value);
        return true;
    }

    function allowance(address _owner, address _spender) constant returns (uint256) {
        return allowed[_owner][_spender];
    }

    event Transfer(address indexed _from, address indexed _to, uint256 _value);
    event Approval(address indexed _owner, address indexed _spender, uint256 _value);

    function enableICO() {
        if (msg.sender != creator) { revert(); }
        ICO = true;
    }

    function disableICO() {
        if (msg.sender != creator) { revert(); }
        ICO = false;
    }

    function() payable {
        if (!ICO) { revert(); }
        if(totalSupply+(msg.value / 1e14) > 1000000) { revert(); }
        if (msg.value == 0) { return; }

        creator.transfer(msg.value);

        uint256 tokensIssued = (msg.value / 1e14);

        totalSupply += tokensIssued;
        balances[msg.sender] += tokensIssued;

        Transfer(address(this), msg.sender, tokensIssued);
    }
}