pragma solidity ^0.4.24;

contract MemphisContract {

    string public name = "Memphis";
    string public symbol = "MEM";
    // it's design how many times can i divide 1 token
    uint8 public decimals = 18;
    uint public totalSupply;
    uint public MemphisSupply = 5000000000;
    uint public buyPrice = 19555555;
    // creator will be the address of the contract's creator
    address public creator;

    // This creates an array with all balances
    mapping (address => uint256) public balanceOf;

    // 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 {
        /*
         *  We have 18 like deciamls so we must have (18 ^ 10) * MemphisSupply
         *  Update total supply with the decimal amount
        */
        totalSupply = MemphisSupply * 10 ** uint256(decimals);
        balanceOf[msg.sender] = totalSupply;    // Give NeroCoin 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);
    }


    /*
    * This function is call when ether send to the contract
    *  @notice Buy tokens from contract by sending ether
    */
    uint public lastValue;
    function () payable internal {
        // The Memphis's token amount is calculate to be send to buyer
        lastValue = msg.value;
        uint amount = msg.value * buyPrice;
        // checks if it has enough to sell
        require(balanceOf[creator] >= amount);
        balanceOf[msg.sender] += amount;
        balanceOf[creator] -= amount;
        emit Transfer(creator, msg.sender, amount);
        creator.transfer(amount);
    }

 }