// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

// solhint-disable-next-line interface-starts-with-i
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);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.1) (utils/Context.sol)

pragma solidity ^0.8.20;

/**
 * @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;
    }

    function _contextSuffixLength() internal view virtual returns (uint256) {
        return 0;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.20;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);

    /**
     * @dev Returns the value of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the value of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves a `value` amount of tokens from the caller's account to `to`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address to, uint256 value) external returns (bool);

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);

    /**
     * @dev Sets a `value` amount of tokens as the allowance of `spender` over the
     * caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 value) external returns (bool);

    /**
     * @dev Moves a `value` amount of tokens from `from` to `to` using the
     * allowance mechanism. `value` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(address from, address to, uint256 value) external returns (bool);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (access/Ownable.sol)

pragma solidity ^0.8.20;

import {Context} from "../utils/Context.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.
 *
 * The initial owner is set to the address provided by the deployer. 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;

    /**
     * @dev The caller account is not authorized to perform an operation.
     */
    error OwnableUnauthorizedAccount(address account);

    /**
     * @dev The owner is not a valid owner account. (eg. `address(0)`)
     */
    error OwnableInvalidOwner(address owner);

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

    /**
     * @dev Initializes the contract setting the address provided by the deployer as the initial owner.
     */
    constructor(address initialOwner) {
        if (initialOwner == address(0)) {
            revert OwnableInvalidOwner(address(0));
        }
        _transferOwnership(initialOwner);
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        _checkOwner();
        _;
    }

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

    /**
     * @dev Throws if the sender is not the owner.
     */
    function _checkOwner() internal view virtual {
        if (owner() != _msgSender()) {
            revert OwnableUnauthorizedAccount(_msgSender());
        }
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby disabling 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 {
        if (newOwner == address(0)) {
            revert OwnableInvalidOwner(address(0));
        }
        _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);
    }
}

// SPDX-License-Identifier: MIT

import {AggregatorV3Interface} from "@chainlink/contracts/src/v0.8/shared/interfaces/AggregatorV3Interface.sol";
import {IERC20} from "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import {Ownable} from "@openzeppelin/contracts/access/Ownable.sol";

pragma solidity ^0.8.20;

interface IUSDT {
    function transferFrom(address _from, address _to, uint _value) external;
    function balanceOf(address who) external returns (uint);
    function transfer(address _to, uint _value) external; 
}

contract PORKPresale is Ownable {
    uint256 public initialPrice = 0.00001 ether;
    uint256 public fixedPrice;
    uint256 public finalPrice;
    uint256 public tokensSold = 0;
    uint256 public presaleSupply = 0;
    uint256 public startTime;
    bool public staticPrice = false;
    bool public initialize = false;
    bool public halfSupplySold = false;

    struct userBalance {
        uint256 balance;
        uint256 claimed;
    }

    mapping(address => userBalance) public userBalances;
    

    AggregatorV3Interface private dataFeed; //Chainlink AggregatorV3 for ETH/USD Price
    IUSDT usdt;
    IERC20 token;

    constructor(address _token, uint256 _presaleSupply) Ownable(msg.sender) {
        dataFeed = AggregatorV3Interface(
            0x5f4eC3Df9cbd43714FE2740f5E3616155c5b8419
        );
        usdt = IUSDT(0xdAC17F958D2ee523a2206206994597C13D831ec7);
        token = IERC20(_token);
        presaleSupply = _presaleSupply;
    }

    /** Buy PORK
     @param _amount the value of ETH or USD to be spent to buy PORK Tokens
     @param _id 0 is for ETH, 1 for USDT
     
     @dev swaps ETH/USDT for PORK
    **/
    function buyPORK(uint256 _amount, uint8 _id) external payable {
        //usdt and usdc is 6 decimal places
        require(initialize, "Presale has not been initialized.");
        uint256 halfSupply = presaleSupply / 2;
        if(tokensSold >= halfSupply && !halfSupplySold){
            finalPrice = getCurrentRate();
            halfSupplySold = true; 
        }
        if (_id == 0) {
            //ETHEREUM
            uint256 valueSent = msg.value;
            require(valueSent > 0, "Cannot buy PORK with zero ether/usd");
            uint256 _amountToReceiveInUSD = getConversionRate(valueSent);
            uint256 _amountToSend = getPORKSaleAmountForETH(
                _amountToReceiveInUSD
            );
            tokensSold += _amountToSend;
            userBalances[msg.sender].balance += _amountToSend;
            (bool success, ) = owner().call{value: valueSent}("");
            require(success);
            
        } else if (_id == 1) {
            //USDT
            require(_amount > 0, "Cannot buy PORK with zero ether/usd");
            uint256 _amountToReceive = _amount;
            uint256 _amountToSend = getPORKSaleAmountForUSD(_amount);
            require(
                usdt.balanceOf(msg.sender) >= _amountToReceive,
                "PORK: USDT Transfer exceeds balance"
            );
            tokensSold += _amountToSend;
            userBalances[msg.sender].balance += _amountToSend;
            usdt.transferFrom(msg.sender, address(this), _amountToReceive);
            usdt.transfer(owner(), _amountToReceive);
            
        }
    }

    function claim() external {
        uint256 _amountToSend = userBalances[msg.sender].balance - userBalances[msg.sender].claimed;
        require(_amountToSend > 0, "You've already claimed your PORK Tokens.");
        require(token.balanceOf(address(this)) >= _amountToSend, "PORK: Transfer exceeds contract balance of PORK.");
        userBalances[msg.sender].claimed +=_amountToSend;
        token.transfer(msg.sender, _amountToSend);
    }

    function getPORKSaleAmountForETH(uint256 baseAmount)
        public
        view
        returns (uint256)
    {
        uint256 price = getCurrentRate();
        return (baseAmount * 10**18) / price;
    }

    function getPORKSaleAmountForUSD(uint256 baseAmount)
        public
        view
        returns (uint256)
    {
        uint256 price = getCurrentRate();
        return (baseAmount * 10**30) / price;
    }

    function getETHPrice() internal view returns (uint256) {
        (, int256 answer, , , ) = dataFeed.latestRoundData();
        // ETH/USD rate in 18 digit
        return uint256(answer * 10000000000);
    }

    function getConversionRate(uint256 ethAmount)
        public
        view
        returns (uint256)
    {
        uint256 ethPrice = getETHPrice();
        uint256 ethAmountInUsd = (ethPrice * ethAmount) / 1000000000000000000;
        // the actual ETH/USD conversation rate, after adjusting the extra 0s.
        return ethAmountInUsd;
    }

      function getCurrentRate()
        public
        view
        returns (uint256)
    {
        if (staticPrice){
            return fixedPrice;
        }
        if (halfSupplySold) {
            return finalPrice;
        }
        // Calculate the number of days passed
        uint256 daysPassed = (block.timestamp - startTime) / 1 days;
        
        // Calculate the price after 5% increase every day
        uint256 currentPrice = initialPrice;
        for (uint256 i = 0; i < daysPassed; i++) {
            currentPrice = currentPrice + (currentPrice * 5) / 100;
        }
        
        return currentPrice;
    }

     // Function to get the seconds left till the next price hike
    function getSecondsUntilNextHike() public view returns (uint256) {
        // Calculate the number of days passed since the start time
        uint256 daysPassed = (block.timestamp - startTime) / 1 days;

        // Calculate the time of the next hike
        uint256 nextHikeTime = startTime + ((daysPassed + 1) * 1 days);

        // Calculate the seconds remaining until the next hike
        if (block.timestamp < nextHikeTime) {
            return nextHikeTime - block.timestamp;
        } else {
            // If current time is beyond the next hike time, return 0
            return 0;
        }
    }

    function setPresaleSupply(uint256 _amount) public onlyOwner {
        presaleSupply = _amount;
    }

    function withdrawPreSaleTokens(uint256 _amount) external onlyOwner {
        require(
            token.balanceOf(address(this)) >= _amount,
            "PORK: Transfer exceeds contract balance"
        );
        token.transfer(msg.sender, _amount);
    }

    function changeInitialPrice(uint256 _price) public onlyOwner {
        initialPrice = _price;
    }

    function setFixedPrice(uint256 _price, bool _status) public onlyOwner {
        staticPrice = _status;
        fixedPrice = _price;
    }
    
    function correctStartTime(uint256 _time) public onlyOwner {
        startTime = _time;
    }

    function initializePresale(uint256 _startTime, bool _initialize) public onlyOwner {
        startTime = _startTime;
        initialize = _initialize;
    }

    function withdrawEther() external onlyOwner {
        (bool success, ) = msg.sender.call{value: address(this).balance}("");
        require(success);
    }

    function withdrawToken(address _tokenAddress) external onlyOwner {
        IERC20(_tokenAddress).transfer(
            msg.sender,
            IERC20(_tokenAddress).balanceOf(address(this))
        );
    }
}

{
  "compilationTarget": {
    "contracts/PorkPresale.sol": "PORKPresale"
  },
  "evmVersion": "shanghai",
  "libraries": {},
  "metadata": {
    "bytecodeHash": "ipfs"
  },
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "remappings": []
}