// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/introspection/IERC165.sol)

pragma solidity ^0.8.13;

// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)

/**
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }
}

// OpenZeppelin Contracts v4.4.1 (access/Ownable.sol)

/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract Ownable is Context {
    address private _owner;

    event OwnershipTransferred(
        address indexed previousOwner,
        address indexed newOwner
    );

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor() {
        _transferOwnership(_msgSender());
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(owner() == _msgSender(), "You are not the owner");
        _;
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        _transferOwnership(address(0));
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(
            newOwner != address(0),
            "Ownable: new owner is the zero address"
        );
        _transferOwnership(newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}

contract VerifySignature {
    /* 1. Unlock MetaMask account
    ethereum.enable()
    */

    /* 2. Get message hash to sign
    getMessageHash(
        0x14723A09ACff6D2A60DcdF7aA4AFf308FDDC160C,
        123,
        "coffee and donuts",
        1
    )

    hash = "0xcf36ac4f97dc10d91fc2cbb20d718e94a8cbfe0f82eaedc6a4aa38946fb797cd"
    */
    function getMessageHash(
        address _to,
        uint256 _payment,
        uint256 _amount,
        uint256 _usdAmount,
        uint256 _nonce,
        uint256 _tokenPrice
    ) public pure returns (bytes32) {
        return
            keccak256(
                abi.encodePacked(_to, _payment, _amount, _usdAmount, _nonce, _tokenPrice)
            );
    }

    /* 3. Sign message hash
    # using browser
    account = "copy paste account of signer here"
    ethereum.request({ method: "personal_sign", params: [account, hash]}).then(console.log)

    # using web3
    web3.personal.sign(hash, web3.eth.defaultAccount, console.log)

    Signature will be different for different accounts
    0x993dab3dd91f5c6dc28e17439be475478f5635c92a56e17e82349d3fb2f166196f466c0b4e0c146f285204f0dcb13e5ae67bc33f4b888ec32dfe0a063e8f3f781b
    */
    function getEthSignedMessageHash(
        bytes32 _messageHash
    ) public pure returns (bytes32) {
        /*
        Signature is produced by signing a keccak256 hash with the following format:
        "\x19Ethereum Signed Message\n" + len(msg) + msg
        */
        return
            keccak256(
                abi.encodePacked(
                    "\x19Ethereum Signed Message:\n32",
                    _messageHash
                )
            );
    }

    /* 4. Verify signature
    signer = 0xB273216C05A8c0D4F0a4Dd0d7Bae1D2EfFE636dd
    to = 0x14723A09ACff6D2A60DcdF7aA4AFf308FDDC160C
    amount = 123
    message = "coffee and donuts"
    nonce = 1
    signature =
        0x993dab3dd91f5c6dc28e17439be475478f5635c92a56e17e82349d3fb2f166196f466c0b4e0c146f285204f0dcb13e5ae67bc33f4b888ec32dfe0a063e8f3f781b
    */
    function verify(
        address _signer,
        address _to,
        uint256 _payment,
        uint256 _amount,
        uint256 _usdAmount,
        uint256 _nonce,
        uint256 _tokenPrice,
        bytes memory signature
    ) public pure returns (bool) {
        bytes32 messageHash = getMessageHash(
            _to,
            _payment,
            _amount,
            _usdAmount,
            _nonce,
            _tokenPrice
        );
        bytes32 ethSignedMessageHash = getEthSignedMessageHash(messageHash);

        return recoverSigner(ethSignedMessageHash, signature) == _signer;
    }

    function recoverSigner(
        bytes32 _ethSignedMessageHash,
        bytes memory _signature
    ) public pure returns (address) {
        (bytes32 r, bytes32 s, uint8 v) = splitSignature(_signature);

        return ecrecover(_ethSignedMessageHash, v, r, s);
    }

    function splitSignature(
        bytes memory sig
    ) public pure returns (bytes32 r, bytes32 s, uint8 v) {
        require(sig.length == 65, "invalid signature length");

        assembly {
            /*
            First 32 bytes stores the length of the signature

            add(sig, 32) = pointer of sig + 32
            effectively, skips first 32 bytes of signature

            mload(p) loads next 32 bytes starting at the memory address p into memory
            */

            // first 32 bytes, after the length prefix
            r := mload(add(sig, 32))
            // second 32 bytes
            s := mload(add(sig, 64))
            // final byte (first byte of the next 32 bytes)
            v := byte(0, mload(add(sig, 96)))
        }

        // implicitly return (r, s, v)
    }
}

interface IERC20 {
    function decimals() external view returns (uint8);
}

contract DeboardTokenLP is VerifySignature, Ownable {
    event Buy(
        address indexed sender,
        address indexed rerecipient,
        uint256 amount,
        uint256 tokenAmount,
        address indexed ref,
        uint256 refAmount
    );

    uint256 public tokenPrice = 0.003 ether; // x dollar per token
    address public devAddress = 0x6018Bf3073EcfD69ad49033E01dB3b6F7f61eD96;

    address public usdt = address(0);
    address public usdc = address(0);

    uint256 public refPercent = 10;

    uint256 public refTokenPercent = 5;

    struct Ref {
        uint256 usdAmount;
        uint256 count;
        uint256 tokenAmount;
    }

    struct Buyer {
        uint256 tokenAmount;
        uint256 usdAmount;
        uint256 totalUsd;
    }

    mapping(address => Ref) public refs;

    mapping(address => uint256) public specialRefs;

    mapping(address => Buyer) public buyers;

    uint256 public totalToken;
    uint256 public totalUsd;

    constructor(address _usdt, address _usdc) {
        require(_usdc != address(0) && _usdt != address(0));
        usdt = _usdt;
        usdc = _usdc;
        devAddress = devAddress == address(0) ? msg.sender : devAddress;
        require(devAddress != address(0));
    }

    function safeTransferETH(address to, uint256 value) internal {
        (bool success, ) = to.call{value: value}(new bytes(0));
        require(success, "TransferHelper: ETH_TRANSFER_FAILED");
    }
    function safeTransferFrom(
        address token,
        address from,
        address to,
        uint256 value
    ) internal {
        (bool success, bytes memory data) = token.call(
            abi.encodeWithSelector(0x23b872dd, from, to, value)
        );
        require(
            success && (data.length == 0 || abi.decode(data, (bool))),
            "TransferHelper: TRANSFER_FROM_FAILED"
        );
    }

    function withdraw() public onlyOwner {
        require(address(this).balance > 0, "Invalid amount");
        safeTransferETH(msg.sender, address(this).balance);
    }

    function setRefPercent(uint256 _percent) public onlyOwner {
        refPercent = _percent;
    }

    function setRefTokenPercent(uint256 _refTokenPercent) public  onlyOwner{
        refTokenPercent = _refTokenPercent;
    }

    function setSpecialRef(address _ref, uint256 _percent) public onlyOwner {
        specialRefs[_ref] = _percent;
    }

    function setTokenPrice(uint256 _price) public onlyOwner {
        tokenPrice = _price;
    }
    mapping(uint256 => bool) public usedNonce;

    function buy(
        address _ref,
        uint256 _amount,
        uint256 _usdAmount,
        uint256 _payment,
        uint256 _nonce,
        address _recipient,
        uint256 _tokenPrice,
        bytes calldata _signature
    ) public payable {
        require(
            verify(
                owner(),
                msg.sender,
                _payment,
                _amount,
                _usdAmount,
                _nonce,
                _tokenPrice,
                _signature
            ) && usedNonce[_nonce] == false,
            "Invalid mint"
        );
        if (_tokenPrice == 0) {
            _tokenPrice = tokenPrice;
        }

        if (_recipient == address(0)) {
            _recipient = msg.sender;
        }

        uint256 tokenAmount = 10**18 * 10**18 * _usdAmount / (_tokenPrice * 10**6);
        uint256 refAmount = 0;
        refAmount += transferToRef(_ref, _amount, _payment, msg.sender, _usdAmount, tokenAmount);
        safeTransfer(_amount - refAmount, _payment, msg.sender, devAddress);
        
        buyers[_recipient].usdAmount +=_usdAmount;
        buyers[_recipient].tokenAmount += tokenAmount;
        
        totalToken += tokenAmount;

        totalUsd += _usdAmount; //10**6
        buyers[_recipient].totalUsd += _usdAmount; //10**6

        emit Buy(msg.sender, _recipient, _amount, tokenAmount, _ref, refAmount);
    }

    function safeTransfer(
        uint256 _amount,
        uint256 _payment,
        address _sender,
        address _receiver
    ) internal {
        if (_payment == 1) {
            safeTransferETH(_receiver, _amount);
        } else {
            safeTransferFrom(
                _payment == 2 ? usdt : usdc,
                _sender,
                _receiver,
                _amount
            );
        }
    }

    function transferToRef(
        address _ref,
        uint256 _amount,
        uint256 _payment,
        address _sender,
        uint256 _usdAmount,
        uint256 _tokenAmount
    ) internal returns (uint256 refAmount) {
        if (_ref != address(0) && _ref != _sender) {
            uint256 percent = specialRefs[_ref] > 0
                ? specialRefs[_ref]
                : refPercent;
            if (percent > 0) {
                refAmount = _amount * percent / 100;
                refs[_ref].usdAmount += _usdAmount* percent / 100;
                refs[_ref].count += 1;
                safeTransfer(refAmount, _payment, _sender, _ref);
            }
            
            refs[_ref].tokenAmount += (_tokenAmount * refTokenPercent/100);
            return refAmount;
        }
    }

    receive() external payable {}
}

{
  "compilationTarget": {
    "DeboardTokenLP.sol": "DeboardTokenLP"
  },
  "evmVersion": "london",
  "libraries": {},
  "metadata": {
    "bytecodeHash": "ipfs"
  },
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "remappings": []
}