Cryo Explorer Ethereum Mainnet

// SPDX-License-Identifier: MIT
// File: @openzeppelin/contracts/security/ReentrancyGuard.sol


// OpenZeppelin Contracts (last updated v4.9.0) (security/ReentrancyGuard.sol)

pragma solidity ^0.8.20;

/**
 * @dev Contract module that helps prevent reentrant calls to a function.
 *
 * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
 * available, which can be applied to functions to make sure there are no nested
 * (reentrant) calls to them.
 *
 * Note that because there is a single `nonReentrant` guard, functions marked as
 * `nonReentrant` may not call one another. This can be worked around by making
 * those functions `private`, and then adding `external` `nonReentrant` entry
 * points to them.
 *
 * TIP: If you would like to learn more about reentrancy and alternative ways
 * to protect against it, check out our blog post
 * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
 */
abstract contract ReentrancyGuard {
    // Booleans are more expensive than uint256 or any type that takes up a full
    // word because each write operation emits an extra SLOAD to first read the
    // slot's contents, replace the bits taken up by the boolean, and then write
    // back. This is the compiler's defense against contract upgrades and
    // pointer aliasing, and it cannot be disabled.

    // The values being non-zero value makes deployment a bit more expensive,
    // but in exchange the refund on every call to nonReentrant will be lower in
    // amount. Since refunds are capped to a percentage of the total
    // transaction's gas, it is best to keep them low in cases like this one, to
    // increase the likelihood of the full refund coming into effect.
    uint256 private constant _NOT_ENTERED = 1;
    uint256 private constant _ENTERED = 2;

    uint256 private _status;

    constructor() {
        _status = _NOT_ENTERED;
    }

    /**
     * @dev Prevents a contract from calling itself, directly or indirectly.
     * Calling a `nonReentrant` function from another `nonReentrant`
     * function is not supported. It is possible to prevent this from happening
     * by making the `nonReentrant` function external, and making it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        _nonReentrantBefore();
        _;
        _nonReentrantAfter();
    }

    function _nonReentrantBefore() private {
        // On the first call to nonReentrant, _status will be _NOT_ENTERED
        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");

        // Any calls to nonReentrant after this point will fail
        _status = _ENTERED;
    }

    function _nonReentrantAfter() private {
        // By storing the original value once again, a refund is triggered (see
        // https://eips.ethereum.org/EIPS/eip-2200)
        _status = _NOT_ENTERED;
    }

    /**
     * @dev Returns true if the reentrancy guard is currently set to "entered", which indicates there is a
     * `nonReentrant` function in the call stack.
     */
    function _reentrancyGuardEntered() internal view returns (bool) {
        return _status == _ENTERED;
    }
}

// File: @openzeppelin/contracts/utils/Context.sol


// 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;
    }
}

// File: @openzeppelin/contracts/access/Ownable.sol


// OpenZeppelin Contracts (last updated v5.0.0) (access/Ownable.sol)

pragma solidity ^0.8.20;


/**
 * @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);
    }
}

// File: @openzeppelin/contracts/token/ERC20/IERC20.sol


// OpenZeppelin Contracts (last updated v5.1.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.20;

/**
 * @dev Interface of the ERC-20 standard as defined in the ERC.
 */
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);
}

// File: @openzeppelin/contracts/token/ERC20/extensions/IERC20Metadata.sol


// OpenZeppelin Contracts (last updated v5.1.0) (token/ERC20/extensions/IERC20Metadata.sol)

pragma solidity ^0.8.20;


/**
 * @dev Interface for the optional metadata functions from the ERC-20 standard.
 */
interface IERC20Metadata is IERC20 {
    /**
     * @dev Returns the name of the token.
     */
    function name() external view returns (string memory);

    /**
     * @dev Returns the symbol of the token.
     */
    function symbol() external view returns (string memory);

    /**
     * @dev Returns the decimals places of the token.
     */
    function decimals() external view returns (uint8);
}

// File: @chainlink/contracts/src/v0.8/interfaces/AggregatorV3Interface.sol


pragma solidity ^0.8.0;

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);
}

// File: MediCoinPresale.sol


pragma solidity ^0.8.20;






interface IMediCoin {
    function presaleTransfer(address to, uint256 amount) external;
    function balanceOf(address account) external view returns (uint256);
}

interface IVestingManager {
    function recordVesting(address user, uint8 stageRaw, uint256 amount) external;
}

contract MediCoinPresale is ReentrancyGuard, Ownable {
    IERC20 public immutable USDT;
    IERC20 public immutable USDC;
    IMediCoin public immutable SaleToken;
    AggregatorV3Interface public immutable ETHOracle;

    address public fundReceiver;
    address public vestingManager; // 🔌 Plug-in for VestingManager.sol

    uint8 public currentStage = 0;
    uint256 public constant USDT_DECIMALS = 1e6;
    uint256 public constant USD_SCALE = 1e18;

    uint256 public tokensSold;
    uint256 public amountRaised;

    struct Stage {
        uint256 price;
        uint256 nextPrice;
        uint256 tokensToSell;
        uint256 usdHardcap;
        uint256 start;
        uint256 end;
        bool active;
        uint256 sold;
        uint256 amountRaised;
    }

    struct User {
        uint256 investedUSD;
        uint256 tokensAllocated;
    }

    mapping(uint8 => Stage) public stages;
    mapping(address => mapping(uint8 => User)) public userInfo;

    event TokensPurchased(address indexed buyer, uint8 stage, uint256 tokens, uint256 usdAmount);
    event StageAdded(uint8 indexed stageId);
    event StageActivated(uint8 indexed stageId);
    event StagePaused(uint8 indexed stageId);
    event VestingManagerUpdated(address newManager);
    event DebugUint(string label, uint256 value);


    constructor(
        address _token,
        address _usdt,
        address _usdc,
        address _oracle,
        address _fundReceiver
    ) Ownable(msg.sender) {
        SaleToken = IMediCoin(_token);
        USDT = IERC20(_usdt);
        USDC = IERC20(_usdc);
        ETHOracle = AggregatorV3Interface(_oracle);
        fundReceiver = _fundReceiver;
    }

    // -------------------- Admin --------------------

    function addStage(
        uint8 _id,
        uint256 _price,
        uint256 _nextPrice,
        uint256 _tokensToSell,
        uint256 _usdHardcap,
        uint256 _start,
        uint256 _end
    ) external onlyOwner {
        require(_end > _start, "Invalid time range");
        require(!stages[_id].active, "Stage exists");

        stages[_id] = Stage({
            price: _price,
            nextPrice: _nextPrice,
            tokensToSell: _tokensToSell,
            usdHardcap: _usdHardcap,
            start: _start,
            end: _end,
            active: false,
            sold: 0,
            amountRaised: 0
        });

        emit StageAdded(_id);
    }

    function activateStage(uint8 _id) external onlyOwner {
        require(block.timestamp >= stages[_id].start, "Too early");
        require(!stages[_id].active, "Already active");
        stages[_id].active = true;
        currentStage = _id;
        emit StageActivated(_id);
    }

    function pauseStage(uint8 _id) external onlyOwner {
        stages[_id].active = false;
        emit StagePaused(_id);
    }

    function setFundReceiver(address _receiver) external onlyOwner {
        fundReceiver = _receiver;
    }

    function setVestingManager(address _vestingManager) external onlyOwner {
        require(_vestingManager != address(0), "Zero address");
        vestingManager = _vestingManager;
        emit VestingManagerUpdated(_vestingManager);
    }

    function withdrawToken(address token, address to, uint256 amount) external onlyOwner {
        IERC20(token).transfer(to, amount);
    }

    function withdrawETH(address to) external onlyOwner {
        payable(to).transfer(address(this).balance);
    }

    // -------------------- Legacy Migration --------------------

    function injectLegacySale(
        address[] calldata users,
        uint8 stage,
        uint256[] calldata usdAmounts,
        uint256[] calldata tokenAmounts
    ) external onlyOwner {
        require(
            users.length == usdAmounts.length && users.length == tokenAmounts.length,
            "Input array lengths mismatch"
        );

        Stage storage s = stages[stage];
        require(stage <= currentStage, "Invalid stage");

        for (uint256 i = 0; i < users.length; i++) {
            address user = users[i];
            uint256 usd = usdAmounts[i];
            uint256 tokens = tokenAmounts[i];

            userInfo[user][stage].investedUSD += usd;
            userInfo[user][stage].tokensAllocated += tokens;
            s.amountRaised += usd;
            s.sold += tokens;
            
            // NEW: Update total project totals
            tokensSold += tokens;
            amountRaised += usd;

            if (vestingManager != address(0)) {
                IVestingManager(vestingManager).recordVesting(user, stage, tokens);
            }

            emit TokensPurchased(user, stage, tokens, usd);
        }
    }


    // -------------------- Emergency Withdraw --------------------

    function withdrawStuckETH() external onlyOwner {
        uint256 balance = address(this).balance;
        require(balance > 0, "No ETH to withdraw");
        payable(owner()).transfer(balance);
    }

    function withdrawStuckTokens(address token) external onlyOwner {
        uint256 balance = IERC20(token).balanceOf(address(this));
        require(balance > 0, "No tokens to withdraw");
        IERC20(token).transfer(owner(), balance);
    }

    
    // -------------------- Buying Logic --------------------

    function buyWithETH(uint256 userProvidedPrice, uint256 deadline) external payable nonReentrant {
        require(msg.value > 0, "No ETH sent");
        require(block.timestamp <= deadline, "Price expired");

        Stage storage s = stages[currentStage];
        require(s.active && block.timestamp < s.end, "Stage inactive");

        uint256 chainlinkPrice = getLatestETHPrice(); // 8 decimals

        require(
            chainlinkPrice >= (userProvidedPrice * 99) / 100 &&
            chainlinkPrice <= (userProvidedPrice * 101) / 100,
            "Price deviation too high"
        );

        uint256 usdAmount = (msg.value * chainlinkPrice) / 1e8;
        _processPurchase(usdAmount, msg.sender);

        payable(fundReceiver).transfer(msg.value);
    }

    function buyWithUSDT(uint256 amount) external nonReentrant {
        require(amount > 0, "Zero amount");
        Stage storage s = stages[currentStage];
        require(s.active && block.timestamp < s.end, "Stage inactive");

        uint256 usdAmount = amount * 1e12;
        _processPurchase(usdAmount, msg.sender);

        require(USDT.transferFrom(msg.sender, fundReceiver, amount), "USDT transfer failed");
    }

    function buyWithUSDC(uint256 amount) external nonReentrant {
        require(amount > 0, "Zero amount");
        Stage storage s = stages[currentStage];
        require(s.active && block.timestamp < s.end, "Stage inactive");

        uint256 usdAmount = amount * 1e12;
        _processPurchase(usdAmount, msg.sender);

        require(USDC.transferFrom(msg.sender, fundReceiver, amount), "USDC transfer failed");
    }

    function _processPurchase(uint256 usdAmount, address buyer) internal {
    Stage storage s = stages[currentStage];

    emit DebugUint("Stage ID", currentStage);
    emit DebugUint("Stage Cap USD", s.usdHardcap);
    emit DebugUint("Stage Raised USD", s.amountRaised);
    emit DebugUint("Incoming USD", usdAmount);

    require(s.amountRaised + usdAmount <= s.usdHardcap, "Hardcap reached");

    uint256 decimals = 10 ** IERC20Metadata(address(SaleToken)).decimals();
    emit DebugUint("Token Decimals", decimals);

    uint256 tokens = (usdAmount * decimals) / s.price;

    emit DebugUint("Token Price", s.price);
    emit DebugUint("Tokens To Allocate", tokens);
    emit DebugUint("Tokens Remaining", s.tokensToSell - s.sold);

    require(tokens <= s.tokensToSell - s.sold, "Not enough tokens");

    userInfo[buyer][currentStage].investedUSD += usdAmount;
    userInfo[buyer][currentStage].tokensAllocated += tokens;

    s.amountRaised += usdAmount;
    s.sold += tokens;

    // Optional debug before affecting global state
    emit DebugUint("Global Sold Before", tokensSold);
    emit DebugUint("Global Raised Before", amountRaised);

    tokensSold += tokens;
    amountRaised += usdAmount;

    emit TokensPurchased(buyer, currentStage, tokens, usdAmount);

    if (vestingManager != address(0)) {
        IVestingManager(vestingManager).recordVesting(buyer, currentStage, tokens);
    }

    // Final confirmation
    emit DebugUint("Global Sold After", tokensSold);
    emit DebugUint("Global Raised After", amountRaised);
}




    function getLatestETHPrice() public view returns (uint256) {
        (, int256 price, , ,) = ETHOracle.latestRoundData();
        return uint256(price); // 8 decimals
    }

    // -------------------- View --------------------

    function getUserInfo(address user, uint8 stage) external view returns (User memory) {
        return userInfo[user][stage];
    }

    function getStageInfo(uint8 _id)
        external
        view
        returns (
            uint256 price,
            uint256 nextPrice,
            uint256 tokensToSell,
            uint256 usdHardcap,
            uint256 start,
            uint256 end,
            bool active,
            uint256 sold,
            uint256 stageAmountRaised
        )
    {
        Stage memory s = stages[_id];
        return (
            s.price,
            s.nextPrice,
            s.tokensToSell,
            s.usdHardcap,
            s.start,
            s.end,
            s.active,
            s.sold,
            s.amountRaised
        );
    }

    receive() external payable {}
}