pragma solidity ^0.4.21;

contract BasicToken {
    uint256 public totalSupply;
    bool public allowTransfer;

    function balanceOf(address _owner) constant returns (uint256 balance);

    function transfer(address _to, uint256 _value) returns (bool success);

    function transferFrom(
        address _from,
        address _to,
        uint256 _value
    ) returns (bool success);

    function approve(address _spender, uint256 _value) returns (bool success);

    function allowance(address _owner, address _spender)
        constant
        returns (uint256 remaining);

    event Transfer(address indexed _from, address indexed _to, uint256 _value);
    event Approval(
        address indexed _owner,
        address indexed _spender,
        uint256 _value
    );
}

contract StandardToken is BasicToken {
    function transfer(address _to, uint256 _value) returns (bool success) {
        require(allowTransfer);
        require(balances[msg.sender] >= _value);
        balances[msg.sender] -= _value;
        balances[_to] += _value;
        Transfer(msg.sender, _to, _value);
        return true;
    }

    function transferFrom(
        address _from,
        address _to,
        uint256 _value
    ) returns (bool success) {
        require(allowTransfer);
        require(
            balances[_from] >= _value && allowed[_from][msg.sender] >= _value
        );
        balances[_to] += _value;
        balances[_from] -= _value;
        allowed[_from][msg.sender] -= _value;
        Transfer(_from, _to, _value);
        return true;
    }

    function balanceOf(address _owner) constant returns (uint256 balance) {
        return balances[_owner];
    }

    function approve(address _spender, uint256 _value) returns (bool success) {
        require(allowTransfer);
        allowed[msg.sender][_spender] = _value;
        Approval(msg.sender, _spender, _value);
        return true;
    }

    function allowance(address _owner, address _spender)
        constant
        returns (uint256 remaining)
    {
        return allowed[_owner][_spender];
    }

    mapping(address => uint256) balances;
    mapping(address => mapping(address => uint256)) allowed;
}

contract Medicoinswiss is StandardToken {
    string public name = "Medicoinswiss";
    uint8 public decimals = 18;
    string public symbol = "MCSS";
    string public version = "ICO";
    address public mintableAddress;

    function Token(address sale_address) {
        balances[msg.sender] = 0;
        totalSupply = 0;
        name = name;
        decimals = decimals;
        symbol = symbol;
        mintableAddress = sale_address;
        allowTransfer = true;
        createTokens();
    }

    function createTokens() internal {
        uint256 total = 337500000000000000000000000;
        balances[this] = total;
        totalSupply = total;
    }

    function changeTransfer(bool allowed) external {
        require(msg.sender == mintableAddress);
        allowTransfer = allowed;
    }

    function mintToken(address to, uint256 amount)
        external
        returns (bool success)
    {
        require(msg.sender == mintableAddress);
        require(balances[this] >= amount);
        balances[this] -= amount;
        balances[to] += amount;
        Transfer(this, to, amount);
        return true;
    }

    function approveAndCall(
        address _spender,
        uint256 _value,
        bytes _extraData
    ) returns (bool success) {
        allowed[msg.sender][_spender] = _value;
        Approval(msg.sender, _spender, _value);

        require(
            _spender.call(
                bytes4(
                    bytes32(
                        sha3("receiveApproval(address,uint256,address,bytes)")
                    )
                ),
                msg.sender,
                _value,
                this,
                _extraData
            )
        );
        return true;
    }
}