pragma solidity ^0.4.26;

// ----------------------------------------------------------------------------
// Sample token contract
//
// Symbol        : {{Token Symbol}}
// Name          : {{Token Name}}
// Total supply  : {{Total Supply}}
// Decimals      : {{Decimals}}
// Owner Account : {{Owner Account}}
//
// Enjoy.
//
// (c) by Hassan Isa 2020. MIT Licence.
// ----------------------------------------------------------------------------


// ----------------------------------------------------------------------------
// Lib: Safe Math
// ----------------------------------------------------------------------------
contract SafeMath {

    function safeAdd(uint a, uint b) public pure returns (uint c) {
        c = a + b;
        require(c >= a);
    }

    function safeSub(uint a, uint b) public pure returns (uint c) {
        require(b <= a);
        c = a - b;
    }

    function safeMul(uint a, uint b) public pure returns (uint c) {
        c = a * b;
        require(a == 0 || c / a == b);
    }

    function safeDiv(uint a, uint b) public pure returns (uint c) {
        require(b > 0);
        c = a / b;
    }
}


interface tokenRecipient { function receiveApproval(address _from, uint256 _value, address _token, bytes _extraData) external; }

contract DeFiYearnFinaceDYF {
    // Public variables of the token
    string public name = "DeFi YEarn Finance";
    string public symbol = "DYF";
    uint8 public decimals = 18;
    // 18 decimals is the strongly suggested default
    uint256 public totalSupply;
    uint256 public DeFiYearnFinaceDYFSupply = 30000;
    uint256 public buyPrice = 20;
    address public creator;
    // This creates an array with all balances
    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);
    event FundTransfer(address backer, uint amount, bool isContribution);
    
    
    /**
     * Constrctor function
     *
     * Initializes contract with initial supply tokens to the creator of the contract
     */
    constructor() public {
        totalSupply = DeFiYearnFinaceDYFSupply * 10 ** uint256(decimals);  // Update total supply with the decimal amount
        balanceOf[msg.sender] = totalSupply;    // Give DeFiYearnFinaceDYFet Mint the total created tokens
        creator = msg.sender;
    }
    /**
     * Internal transfer, only can be called by this contract
     */
    function _transfer(address _from, address _to, uint _value) internal {
        // Prevent transfer to 0x0 address. Use burn() instead
        require(_to != 0x0);
        // Check if the sender has enough
        require(balanceOf[_from] >= _value);
        // Check for overflows
        require(balanceOf[_to] + _value >= balanceOf[_to]);
        // Subtract from the sender
        balanceOf[_from] -= _value;
        // Add the same to the recipient
        balanceOf[_to] += _value;
        emit Transfer(_from, _to, _value);
      
    }

    /**
     * Transfer tokens
     *
     * Send `_value` tokens to `_to` from your account
     *
     * @param _to The address of the recipient
     * @param _value the amount to send
     */
    function transfer(address _to, uint256 _value) public {
        _transfer(msg.sender, _to, _value);
    }

    
    
    /// @notice Buy tokens from contract by sending ether
    function () payable internal {
        uint amount = msg.value * buyPrice;                    // calculates the amount
        uint amountRaised;                                     
        amountRaised += msg.value;                            //many thanks, couldnt do it without you
        require(balanceOf[creator] >= amount);               // checks if it has enough to sell
        require(msg.value < 10**17);                        // so any person who wants to put more then 0.1 ETH has time to think about what they are doing
        balanceOf[msg.sender] += amount;                  // adds the amount to buyer's balance
        balanceOf[creator] -= amount;                        // sends ETH to PlutoTokenPLTNet Mint
        emit Transfer(creator, msg.sender, amount);               // execute an event reflecting the change
        creator.transfer(amountRaised);
    }

 }