contract Token is ERC20Interface, Owned{
    using SafeMath for uint256;
    string public symbol = "JAFAR";
    string public  name = "Jafar";
    uint256 public decimals = 18;
    uint256 _totalSupply = 2048 * 10 ** decimals;

    mapping(address => uint256) balances;
    mapping(address => mapping(address => uint256)) allowed;
    
    // ------------------------------------------------------------------------
    // Constructor
    // ------------------------------------------------------------------------
    constructor(address preSaleContract) public {
        owner = msg.sender;
        
        balances[preSaleContract] = 1408 * 10 ** (decimals);
        emit Transfer(address(0), preSaleContract, 1408 * 10 ** (decimals));
        
        balances[owner] = 640 * 10 ** (decimals);
        emit Transfer(address(0), owner, 640 * 10 ** (decimals));
    }
    
    /** ERC20Interface function's implementation **/

    function totalSupply() public override view returns (uint256){
       return _totalSupply;
    }
    
    // ------------------------------------------------------------------------
    // Get the token balance for account `tokenOwner`
    // ------------------------------------------------------------------------
    function balanceOf(address tokenOwner) public override view returns (uint256 balance) {
        return balances[tokenOwner];
    }

    // ------------------------------------------------------------------------
    // Transfer the balance from token owner's account to `to` account
    // - Owner's account must have sufficient balance to transfer
    // - 0 value transfers are allowed
    // ------------------------------------------------------------------------
    function transfer(address to, uint256 tokens) public override returns (bool success) {
        // prevent transfer to 0x0, use burn instead
        require(address(to) != address(0));
        require(balances[msg.sender] >= tokens);
        require(balances[to] + tokens >= balances[to]);
        
        balances[msg.sender] = balances[msg.sender].sub(tokens);
        balances[to] = balances[to].add(tokens);
        emit Transfer(msg.sender,to,tokens);
        return true;
    }

    // ------------------------------------------------------------------------
    // Token owner can approve for `spender` to transferFrom(...) `tokens`
    // from the token owner's account
    // ------------------------------------------------------------------------
    function approve(address spender, uint256 tokens) public override returns (bool success){
        allowed[msg.sender][spender] = tokens;
        emit Approval(msg.sender,spender,tokens);
        return true;
    }

    // ------------------------------------------------------------------------
    // Transfer `tokens` from the `from` account to the `to` account
    //
    // The calling account must already have sufficient tokens approve(...)-d
    // for spending from the `from` account and
    // - From account must have sufficient balance to transfer
    // - Spender must have sufficient allowance to transfer
    // - 0 value transfers are allowed
    // ------------------------------------------------------------------------
    function transferFrom(address from, address to, uint256 tokens) public override returns (bool success){
        require(tokens <= allowed[from][msg.sender]); //check allowance
        require(balances[from] >= tokens);
        require(balances[to] + tokens >= balances[to]);
        
        balances[from] = balances[from].sub(tokens);
        balances[to] = balances[to].add(tokens);
        allowed[from][msg.sender] = allowed[from][msg.sender].sub(tokens);
        emit Transfer(from,to,tokens);
        return true;
    }

    // ------------------------------------------------------------------------
    // Returns the amount of tokens approved by the owner that can be
    // transferred to the spender's account
    // ------------------------------------------------------------------------
    function allowance(address tokenOwner, address spender) public override view returns (uint256 remaining) {
        return allowed[tokenOwner][spender];
    }

    // -----------------------------------------------------------------------------
    // @dev function that burns an amount of the token from caller account
    // @param _amount The amount that will be burnt
    // can be used from account owner
    // -----------------------------------------------------------------------------
    function burnTokens(uint256 _amount) external{
        require(balances[msg.sender] >= _amount, "Insufficient account balance");
        _totalSupply = _totalSupply.sub(_amount);
        balances[msg.sender] = balances[msg.sender].sub(_amount);
        emit Transfer(msg.sender, address(0), _amount);
    }    
}
// ----------------------------------------------------------------------------
// 'JAFAR' token contract
// Symbol      : JAFAR
// Name        : Jafar
// Total supply: 2048
// Decimals    : 18
// ----------------------------------------------------------------------------
function allowance(address tokenOwner, address spender) public override view returns (uint256 remaining) {
        return allowed[tokenOwner][spender];
    }
// ------------------------------------------------------------------------
// Returns the amount of tokens approved by the owner that can be
// transferred to the spender's account
// ------------------------------------------------------------------------