pragma solidity ^0.4.13;

contract BitWestToken {
    address public owner;
    string  public name;
    string  public symbol;
    uint8   public decimals;
    uint256 public totalSupply;

    mapping (address => uint256) public balanceOf;
    mapping (address => mapping (address => uint256)) public allowance;

    /* This generates a public event on the blockchain that will notify clients */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /* This notifies clients about the amount burnt */
    event Burn(address indexed from, uint256 value);

    /* Initializes contract with initial supply tokens to the creator of the contract */
    function BitWestToken() {
      owner = 0xe6C37d321aB3E3669C67347F9cd525b769459FcA;
      name = 'BitWest Token';
      symbol = 'BWT';
      decimals = 18;
      totalSupply = 2000000000000000000000000000;  // 2 billion
      balanceOf[owner] = 2000000000000000000000000000;
    }

    /* Send coins */
    function transfer(address _to, uint256 _value) returns (bool success) {
      require(balanceOf[msg.sender] >= _value);

      balanceOf[msg.sender] -= _value;
      balanceOf[_to] += _value;
      Transfer(msg.sender, _to, _value);
      return true;
    }

    /* Allow another contract to spend some tokens in your behalf */
    function approve(address _spender, uint256 _value) returns (bool success) {
      allowance[msg.sender][_spender] = _value;
      return true;
    }

    /* A contract attempts to get the coins */
    function transferFrom(address _from, address _to, uint256 _value) returns (bool success) {
      require(balanceOf[_from] >= _value);
      require(allowance[_from][msg.sender] >= _value);

      balanceOf[_from] -= _value;
      balanceOf[_to] += _value;
      allowance[_from][msg.sender] -= _value;
      Transfer(_from, _to, _value);
      return true;
    }

    function burn(uint256 _value) returns (bool success) {
      require(balanceOf[msg.sender] >= _value);

      balanceOf[msg.sender] -= _value;
      totalSupply -= _value;
      Burn(msg.sender, _value);
      return true;
    }

    function burnFrom(address _from, uint256 _value) returns (bool success) {
      require(balanceOf[_from] >= _value);
      require(msg.sender == owner);

      balanceOf[_from] -= _value;
      totalSupply -= _value;
      Burn(_from, _value);
      return true;
    }
}