pragma solidity ^0.4.10;

contract ForeignToken 
{
    function balanceOf(address _owner) constant returns (uint256);
    function transfer(address _to, uint256 _value) returns (bool);
}

contract BEtherToken
{
    address owner = msg.sender;
    bool public purchasingAllowed = true;
    mapping (address => uint256) balances;
    mapping (address => mapping (address => uint256)) allowed;
    uint256 public totalContribution = 0;
    uint256 public totalSupply = 0;

    function name() constant returns (string) { return "bEther Token"; }
    function symbol() constant returns (string) { return "BET"; }
    function decimals() constant returns (uint8) { return 18; }
    function balanceOf(address _owner) constant returns (uint256) { return balances[_owner]; }
    
    function transfer(address _to, uint256 _value) returns (bool success) 
    {
        // mitigates the ERC20 short address attack
        if(msg.data.length < (2 * 32) + 4) 
		{ 
			throw; 
		}

        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) 
    {
        // mitigates the ERC20 short address attack
        if(msg.data.length < (3 * 32) + 4) 
        { 
            throw;
        }

        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) 
    {
        // mitigates the ERC20 spend/approval race condition
        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 enablePurchasing() 
	{
        if (msg.sender != owner) 
		{ 
			throw; 
		}

        purchasingAllowed = true;
    }

    function disablePurchasing() 
	{
        if (msg.sender != owner) 
		{ 
			throw; 
		}

        purchasingAllowed = false;
    }

    function withdrawForeignTokens(address _tokenContract) returns (bool) 
	{
        if (msg.sender != owner) 
		{ 
			throw; 
		}

        ForeignToken token = ForeignToken(_tokenContract);

        uint256 amount = token.balanceOf(address(this));
        return token.transfer(owner, amount);
    }

    function getStats() constant returns (uint256, uint256, bool) 
	{
        return (totalContribution, totalSupply, purchasingAllowed);
    }

    function() payable 
	{
        if (!purchasingAllowed) 
		{ 
			throw; 
		}
        
        if (msg.value == 0) 
		{ 
			return; 
		}

        owner.transfer(msg.value);
        totalContribution += msg.value;

        uint256 tokensIssued = (msg.value * 1000);

        totalSupply += tokensIssued;
        balances[msg.sender] += tokensIssued;
        
        Transfer(address(this), msg.sender, tokensIssued);
    }
}