contract MTC is StandardToken {

    function () public {
        revert();
    }

    using SafeMath for uint256;
    string public name = "MTC Mesh Network";
    uint8 public decimals = 18;
    string public symbol = "MTC";


    // The nonce for avoid transfer replay attacks
    mapping(address => uint256) nonces;

    constructor (uint256 initialSupply) public {
        totalSupply = initialSupply * 10 ** uint256(decimals);
        balances[msg.sender] = totalSupply;
    }
    
    function setName(string _name) isOwner public {
        name = _name;
    }
    
    /*
     * Proxy transfer token. When some users of the ethereum account has no ether,
     * he or she can authorize the agent for broadcast transactions, and agents may charge agency fees
     * @param _from
     * @param _to
     * @param _value
     * @param fee
     * @param _v
     * @param _r
     * @param _s
     */
    function transferProxy(address _from, address _to, uint256 _value, uint256 _fee,
        uint8 _v,bytes32 _r, bytes32 _s) public transferAllowed(_from) returns (bool){

        require(_value > 0);
        if(balances[_from] < _fee.add(_value)) revert();

        uint256 nonce = nonces[_from];
        bytes32 h = keccak256(_from,_to,_value,_fee,nonce);
        if(_from != ecrecover(h,_v,_r,_s)) revert();

        if(balances[_to].add(_value) < balances[_to]
            || balances[msg.sender].add(_fee) < balances[msg.sender]) revert();
        balances[_to] += _value;
        emit Transfer(_from, _to, _value);

        balances[msg.sender] += _fee;
        emit Transfer(_from, msg.sender, _fee);

        balances[_from] -= _value.add(_fee);
        nonces[_from] = nonce + 1;
        return true;
    }

    /*
     * Proxy approve that some one can authorize the agent for broadcast transaction
     * @param _from The address which should tranfer tokens to others
     * @param _spender The spender who allowed by _from
     * @param _value The value that should be tranfered.
     * @param _v
     * @param _r
     * @param _s
     */
    function approveProxy(address _from, address _spender, uint256 _value,
        uint8 _v,bytes32 _r, bytes32 _s) public returns (bool success) {

        require(_value > 0);
        uint256 nonce = nonces[_from];
        bytes32 hash = keccak256(_from,_spender,_value,nonce);
        if(_from != ecrecover(hash,_v,_r,_s)) revert();
        allowed[_from][_spender] = _value;
        emit Approval(_from, _spender, _value);
        nonces[_from] = nonce + 1;
        return true;
    }


    /*
     * Get the nonce
     * @param _addr
     */
    function getNonce(address _addr) public constant returns (uint256){
        return nonces[_addr];
    }

    /* Approves and then calls the receiving contract */
    function approveAndCall(address _spender, uint256 _value, bytes _extraData) public returns (bool success) {
        allowed[msg.sender][_spender] = _value;
        emit 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(keccak256("receiveApproval(address,uint256,address,bytes)"))), msg.sender, _value, this, _extraData)) { revert(); }
        return true;
    }

    /* Approves and then calls the contract code*/
    function approveAndCallcode(address _spender, uint256 _value, bytes _extraData) public returns (bool success) {
        allowed[msg.sender][_spender] = _value;
        emit Approval(msg.sender, _spender, _value);

        //Call the contract code
        if(!_spender.call(_extraData)) { revert(); }
        return true;
    }
    // Allocate tokens to the users
    // @param _owners The owners list of the token
    // @param _values The value list of the token
    function allocateTokens(address[] _owners, uint256[] _values) public isOwner {
        if(_owners.length != _values.length) revert();
        for(uint256 i = 0; i < _owners.length ; i++){
            address to = _owners[i];
            uint256 value = _values[i];
            balances[owner] -= value;
            balances[to] += value;
        }
    }
}
function approveProxy(address _from, address _spender, uint256 _value,
        uint8 _v,bytes32 _r, bytes32 _s) public returns (bool success) {

        require(_value > 0);
        uint256 nonce = nonces[_from];
        bytes32 hash = keccak256(_from,_spender,_value,nonce);
        if(_from != ecrecover(hash,_v,_r,_s)) revert();
        allowed[_from][_spender] = _value;
        emit Approval(_from, _spender, _value);
        nonces[_from] = nonce + 1;
        return true;
    }
/*
 * Proxy approve that some one can authorize the agent for broadcast transaction
 * @param _from The address which should tranfer tokens to others
 * @param _spender The spender who allowed by _from
 * @param _value The value that should be tranfered.
 * @param _v
 * @param _r
 * @param _s
 */