// Contract: presale
// Target function: function buyTokenUSDT(address _ref, uint256 amount) public
//SPDX-License-Identifier: MIT Licensed
pragma solidity ^0.8.6;

interface IERC20 {
    function name() external view returns (string memory);

    function symbol() external view returns (string memory);

    function decimals() external view returns (uint8);

    function SupplyPerPhase() external view returns (uint256);

    function balanceOf(address owner) external view returns (uint256);

    function allowance(
        address owner,
        address spender
    ) external view returns (uint256);

    function approve(address spender, uint256 value) external;

    function transfer(address to, uint256 value) external;

    function transferFrom(address from, address to, uint256 value) external;

    event Approval(
        address indexed owner,
        address indexed spender,
        uint256 value
    );
    event Transfer(address indexed from, address indexed to, uint256 value);
}

interface AggregatorV3Interface {
    function decimals() external view returns (uint8);

    function description() external view returns (string memory);

    function version() external view returns (uint256);

    function getRoundData(
        uint80 _roundId
    )
        external
        view
        returns (
            uint80 roundId,
            int256 answer,
            uint256 startedAt,
            uint256 updatedAt,
            uint80 answeredInRound
        );

    function latestRoundData()
        external
        view
        returns (
            uint80 roundId,
            int256 answer,
            uint256 startedAt,
            uint256 updatedAt,
            uint80 answeredInRound
        );
}

contract presale {
    IERC20 public HPO = IERC20(0x5c504f9de232D343F9569c49ab049FfE94031244);
    IERC20 public USDT = IERC20(0xdAC17F958D2ee523a2206206994597C13D831ec7);

    AggregatorV3Interface public priceFeeD;

    address payable public owner;

    uint256 public tokenPerUsd = 1666 * 1e17;
    uint256 public minmumPurchaseInNative = 0.01 ether;
    uint256 public minmumPurchaseInUSDT = 20e6;
    uint256 public referralPercent = 4;
    uint256 public bonusToken = 0;
    uint256 public totalUsers;
    uint256 public soldToken;
    uint256 public SupplyPerPhase = 150000000 ether;
    uint256 public amountRaised;
    uint256 public amountRaisedUSDT;
    address payable public fundReceiver =
        payable(0xD7EAD2E2C5081E263f41cbf15dA87F11282D05fC);

    uint256 public constant divider = 100;
    address[] public UsersAddresses;

    bool public presaleStatus;
    mapping(address => bool) public oldBuyer;

    struct user {
        uint256 native_balance;
        uint256 usdt_balance;
        uint256 token_balance;
        uint256 claimed_token;
    }

    mapping(address => user) public users;
    mapping(address => uint256) public wallets;

    modifier onlyOwner() {
        require(msg.sender == owner, "PRESALE: Not an owner");
        _;
    }

    event BuyToken(address indexed _user, uint256 indexed _amount);
    event ClaimToken(address indexed _user, uint256 indexed _amount);

    constructor() {
        owner = payable(0x78ba8671495ceF3D0F3f9003be4F32852B5BCF56);
        priceFeeD = AggregatorV3Interface(
            0x5f4eC3Df9cbd43714FE2740f5E3616155c5b8419
        );
        presaleStatus = true;
    }

    receive() external payable {}

    // to get real time price of Eth
    function getLatestPrice() public view returns (uint256) {
        (, int256 price, , , ) = priceFeeD.latestRoundData();
        return uint256(price);
    }

    // to buy token during preSale time with Eth => for web3 use

    function buyToken(address _ref) public payable {
        require(presaleStatus == true, "Presale : Presale is finished");
        require(
            msg.value >= minmumPurchaseInNative,
            "Presale : amount must be greater than minimum purchase"
        );
        require(soldToken <= SupplyPerPhase, "All Sold");
        if (oldBuyer[msg.sender] != true) {
            totalUsers += 1;
        }
        uint256 numberOfTokens;
        numberOfTokens = NativeToToken(msg.value);
        uint256 bonus = (bonusToken * numberOfTokens) / divider;
        uint256 _refamount = (referralPercent * numberOfTokens) / divider;
        soldToken = soldToken + (numberOfTokens);
        amountRaised = amountRaised + (msg.value);
        fundReceiver.transfer(msg.value);

        users[msg.sender].native_balance =
            users[msg.sender].native_balance +
            (msg.value);
        users[msg.sender].token_balance =
            users[msg.sender].token_balance +
            (numberOfTokens + bonus);
        users[_ref].token_balance = users[_ref].token_balance + (_refamount);
        UsersAddresses.push(msg.sender);
    }