pragma solidity ^0.4.4;

	contract Token {

		/// @return total amount of tokens
		function totalSupply() constant returns (uint256 supply) {}

		/// @param _owner The address from which the balance will be retrieved
		/// @return The balance
		function balanceOf(address _owner) constant returns (uint256 balance) {}

		/// @notice send `_value` token to `_to` from `msg.sender`
		/// @param _to The address of the recipient
		/// @param _value The amount of token to be transferred
		/// @return Whether the transfer was successful or not
		function transfer(address _to, uint256 _value) returns (bool success) {}

		/// @notice send `_value` token to `_to` from `_from` on the condition it is approved by `_from`
		/// @param _from The address of the sender
		/// @param _to The address of the recipient
		/// @param _value The amount of token to be transferred
		/// @return Whether the transfer was successful or not
		function transferFrom(address _from, address _to, uint256 _value) returns (bool success) {}

		/// @notice `msg.sender` approves `_addr` to spend `_value` tokens
		/// @param _spender The address of the account able to transfer the tokens
		/// @param _value The amount of wei to be approved for transfer
		/// @return Whether the approval was successful or not
		function approve(address _spender, uint256 _value) returns (bool success) {}

		/// @param _owner The address of the account owning tokens
		/// @param _spender The address of the account able to transfer the tokens
		/// @return Amount of remaining tokens allowed to spent
		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 Token {

		function transfer(address _to, uint256 _value) returns (bool success) {
			//Default assumes totalSupply can't be over max (2^256 - 1).
			//If your token leaves out totalSupply and can issue more tokens as time goes on, you need to check if it doesn't wrap.
			//Replace the if with this one instead.
			//if (balances[msg.sender] >= _value && balances[_to] + _value > balances[_to]) {
			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) {
			//same as above. Replace this line with the following if you want to protect against wrapping uints.
			//if (balances[_from] >= _value && allowed[_from][msg.sender] >= _value && balances[_to] + _value > balances[_to]) {
			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;
	}


	//name this contract whatever you'd like
	contract Wanchain is StandardToken {

		function () {
			//if ether is sent to this address, send it back.
			throw;
		}

		/* Public variables of the token */

		/*
		NOTE:
		The following variables are OPTIONAL vanities. One does not have to include them.
		They allow one to customise the token contract & in no way influences the core functionality.
		Some wallets/interfaces might not even bother to look at this information.
		*/
		string public name;                   //fancy name: eg Simon Bucks
		uint8 public decimals;                //How many decimals to show. ie. There could 1000 base units with 3 decimals. Meaning 0.980 SBX = 980 base units. It's like comparing 1 wei to 1 ether.
		string public symbol;                 //An identifier: eg SBX
		string public version = 'H1.0';       //human 0.1 standard. Just an arbitrary versioning scheme.

	//
	// CHANGE THESE VALUES FOR YOUR TOKEN
	//

	//make sure this function name matches the contract name above. So if you're token is called TutorialToken, make sure the //contract name above is also TutorialToken instead of ERC20Token

		function Wanchain(
			) {
			balances[msg.sender] = 210000000000000000000000000;               // Give the creator all initial tokens (100000 for example)
			totalSupply = 210000000000000000000000000;                        // Update total supply (100000 for example)
			name = "Wanchain";                                   // Set the name for display purposes
			decimals = 18;                            // Amount of decimals for display purposes
			symbol = "WAN";                               // Set the symbol for display purposes
		}

		/* Approves and then calls the receiving contract */
		function approveAndCall(address _spender, uint256 _value, bytes _extraData) returns (bool success) {
			allowed[msg.sender][_spender] = _value;
			Approval(msg.sender, _spender, _value);

			//call the receiveApproval function on the contract you want to be notified. This crafts the function signature manually so one doesn't have to include a contract in here just for this.
			//receiveApproval(address _from, uint256 _value, address _tokenContract, bytes _extraData)
			//it is assumed that when does this that the call *should* succeed, otherwise one would use vanilla approve instead.
			if(!_spender.call(bytes4(bytes32(sha3("receiveApproval(address,uint256,address,bytes)"))), msg.sender, _value, this, _extraData)) { throw; }
			return true;
		}
	}