pragma solidity ^0.4.4;

contract Token {

    function totalSupply() constant returns (uint256 supply) {}
    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);           
    event Burn(address indexed from, uint256 value);
}

contract StandardToken is Token {

    function transfer(address _to, uint256 _value) returns (bool success) {
        require(_to != 0x0);                                                    /////////// Prevent transfer to 0X0 adress. We can use burn. ///////////
        if (balances[msg.sender] >= _value && _value > 0) {
            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 (balances[_from] >= _value && allowed[_from][msg.sender] >= _value && _value > 0) {  
            balances[_to] += _value;
            balances[_from] -= _value;
            allowed[_from][msg.sender] -= _value;
            Transfer(_from, _to, _value);
            return true;
        } else { return false; }
    }

    function balanceOf(address _owner) constant returns (uint256 balance) {
        return balances[_owner];
    }

    function approve(address _spender, uint256 _value) returns (bool success) {
        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;
    uint256 public totalSupply;
}

contract PUMPNDUMP is StandardToken { 

    string public name;
    uint8 public decimals;
    string public symbol;
    string public version = '1.0';
    uint256 public unitsOneEthCanBuy;
    uint256 public totalEthInWei;
    address public fundsWallet;

    function PUMPNDUMP() {
        balances[msg.sender] = 400000000000000000000000;
        totalSupply = 400000000000000000000000;
        name = "Pump and Dump";
        decimals = 18;
        symbol = "PUMPNDUMP";
        unitsOneEthCanBuy = 200;
        fundsWallet = msg.sender;
    }

    function() payable{
        totalEthInWei = totalEthInWei + msg.value;
        uint256 amount = msg.value * unitsOneEthCanBuy;
        require(balances[fundsWallet] >= amount);					            /////////// With this function you receive your ETH back when you there are no tokens left in the contract. ///////////
        if (balances[fundsWallet] < amount) {
            return;
        }

        balances[fundsWallet] = balances[fundsWallet] - amount;
        balances[msg.sender] = balances[msg.sender] + amount;
        Transfer(fundsWallet, msg.sender, amount);
        fundsWallet.transfer(msg.value);                               
    }

    function approveAndCall(address _spender, uint256 _value, bytes _extraData) returns (bool success) {
        allowed[msg.sender][_spender] = _value;
        Approval(msg.sender, _spender, _value);

        if(!_spender.call(bytes4(bytes32(sha3("receiveApproval(address,uint256,address,bytes)"))), msg.sender, _value, this, _extraData)) { throw; }
        return true;
    }

    function burn(uint256 _value) public returns (bool success) {
        require(balances[msg.sender] >= _value*1000000000000000000);
        balances[msg.sender] -= _value*1000000000000000000;
        totalSupply -= _value*1000000000000000000;
        Burn(msg.sender, _value*1000000000000000000);
        return true;
    }
}