// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.4) (utils/Context.sol)

pragma solidity ^0.8.0;

/**
 * @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 v4.9.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

/**
 * @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 amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

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

    /**
     * @dev Moves `amount` 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 amount) 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 `amount` 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 amount) external returns (bool);

    /**
     * @dev Moves `amount` tokens from `from` to `to` using the
     * allowance mechanism. `amount` 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 amount) external returns (bool);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (access/Ownable.sol)

pragma solidity ^0.8.0;

import "../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.
 *
 * 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 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 {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
    }

    /**
     * @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 {
        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);
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (security/Pausable.sol)

pragma solidity ^0.8.0;

import "../utils/Context.sol";

/**
 * @dev Contract module which allows children to implement an emergency stop
 * mechanism that can be triggered by an authorized account.
 *
 * This module is used through inheritance. It will make available the
 * modifiers `whenNotPaused` and `whenPaused`, which can be applied to
 * the functions of your contract. Note that they will not be pausable by
 * simply including this module, only once the modifiers are put in place.
 */
abstract contract Pausable is Context {
    /**
     * @dev Emitted when the pause is triggered by `account`.
     */
    event Paused(address account);

    /**
     * @dev Emitted when the pause is lifted by `account`.
     */
    event Unpaused(address account);

    bool private _paused;

    /**
     * @dev Initializes the contract in unpaused state.
     */
    constructor() {
        _paused = false;
    }

    /**
     * @dev Modifier to make a function callable only when the contract is not paused.
     *
     * Requirements:
     *
     * - The contract must not be paused.
     */
    modifier whenNotPaused() {
        _requireNotPaused();
        _;
    }

    /**
     * @dev Modifier to make a function callable only when the contract is paused.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    modifier whenPaused() {
        _requirePaused();
        _;
    }

    /**
     * @dev Returns true if the contract is paused, and false otherwise.
     */
    function paused() public view virtual returns (bool) {
        return _paused;
    }

    /**
     * @dev Throws if the contract is paused.
     */
    function _requireNotPaused() internal view virtual {
        require(!paused(), "Pausable: paused");
    }

    /**
     * @dev Throws if the contract is not paused.
     */
    function _requirePaused() internal view virtual {
        require(paused(), "Pausable: not paused");
    }

    /**
     * @dev Triggers stopped state.
     *
     * Requirements:
     *
     * - The contract must not be paused.
     */
    function _pause() internal virtual whenNotPaused {
        _paused = true;
        emit Paused(_msgSender());
    }

    /**
     * @dev Returns to normal state.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    function _unpause() internal virtual whenPaused {
        _paused = false;
        emit Unpaused(_msgSender());
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (security/ReentrancyGuard.sol)

pragma solidity ^0.8.0;

/**
 * @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;
    }
}

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

import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/security/ReentrancyGuard.sol";
import "@openzeppelin/contracts/security/Pausable.sol";
import "@openzeppelin/contracts/access/Ownable.sol";

contract VeniumCasesV2 is ReentrancyGuard, Pausable, Ownable {
    IERC20 public paymentToken;
    IERC20 public rewardToken;

    struct Reward {
        uint256 amount;
        uint256 weight;
    }

    struct Case {
        uint256 price;
        Reward[] rewards;
        uint256 totalWeight;
        bool isActive;
    }

mapping(address => mapping(uint256 => uint256[])) public lastReward; 

    mapping(uint256 => Case) public cases;
    uint256 public caseCount;

    uint256 public totalOpened;

    mapping(address => mapping(uint256 => uint256)) public casesOpenedByAddress;

    event CaseCreated(uint256 indexed caseId, uint256 price);
    event CaseOpened(
        address indexed opener,
        uint256 indexed caseId,
        uint256 rewardAmount,
        uint256 totalCasesOpened
    );
    event RewardAdded(uint256 indexed caseId, uint256 amount, uint256 weight);
    event CaseStatusChanged(uint256 indexed caseId, bool isActive);
    event TokensWithdrawn(address token, uint256 amount);

    constructor(address _paymentToken, address _rewardToken) {
        paymentToken = IERC20(_paymentToken);
        rewardToken = IERC20(_rewardToken);
    }

    function createCase(uint256 _price) external onlyOwner {
        uint256 newCaseId = caseCount;
        cases[newCaseId].price = _price;
        cases[newCaseId].isActive = true;
        caseCount++;
        emit CaseCreated(newCaseId, _price);
    }

    function addRewardToCase(
        uint256 _caseId,
        uint256 _amount,
        uint256 _weight
    ) external onlyOwner {
        require(_caseId < caseCount, "Case does not exist");
        require(_weight > 0, "Weight must be greater than 0");

        Case storage c = cases[_caseId];
        c.rewards.push(Reward(_amount, _weight));
        c.totalWeight += _weight;

        emit RewardAdded(_caseId, _amount, _weight);
    }

    function openCase(uint256 _caseId, uint256 _count) external nonReentrant whenNotPaused {
        require(_caseId < caseCount, "Case does not exist");
        Case storage c = cases[_caseId];
        require(c.isActive, "Case is not active");
        require(c.totalWeight > 0, "Case is empty");

        require(_count > 0 && _count <= 5, "You can open a maximum of 5 cases at a time");

        uint256 totalRewardAmount = 0;

        // Reset the lastReward array for the current caseId
        lastReward[msg.sender][_caseId] = new uint256[](0); // Reset the array

        for (uint256 j = 0; j < _count; j++) {
            require(
                paymentToken.transferFrom(msg.sender, address(this), c.price),
                "Payment failed"
            );

            // Generate a unique random number for each case opening
            uint256 randomNumber = uint256(
                keccak256(
                    abi.encodePacked(
                        block.timestamp,
                        msg.sender,
                        blockhash(block.number - 1),
                        j // Use the loop index to add uniqueness
                    )
                )
            ) % c.totalWeight;

            uint256 rewardAmount;
            for (uint256 i = 0; i < c.rewards.length; i++) {
                if (randomNumber < c.rewards[i].weight) {
                    rewardAmount = c.rewards[i].amount;
                    break;
                }
                randomNumber -= c.rewards[i].weight;
            }

            require(
                rewardToken.balanceOf(address(this)) >= rewardAmount,
                "Insufficient reward balance"
            );
            require(
                rewardToken.transfer(msg.sender, rewardAmount),
                "Reward transfer failed"
            );

            casesOpenedByAddress[msg.sender][_caseId]++;
            
            // Store the most recent reward
            lastReward[msg.sender][_caseId].push(rewardAmount); // Store the new reward

            totalOpened++;
            totalRewardAmount += rewardAmount;
        }

        emit CaseOpened(
            msg.sender,
            _caseId,
            totalRewardAmount,
            _count
        );
    }

    function getLastReward(address _opener, uint256 _caseId) external view returns (uint256[] memory) {
        return lastReward[_opener][_caseId];
    }

    function setCaseStatus(uint256 _caseId, bool _isActive) external onlyOwner {
        require(_caseId < caseCount, "Case does not exist");
        cases[_caseId].isActive = _isActive;
        emit CaseStatusChanged(_caseId, _isActive);
    }

    function setCasePrice(
        uint256 _caseId,
        uint256 _newPrice
    ) external onlyOwner {
        require(_caseId < caseCount, "Case does not exist");
        cases[_caseId].price = _newPrice;
    }

    function depositRewardTokens(uint256 amount) external onlyOwner {
        require(
            rewardToken.transferFrom(msg.sender, address(this), amount),
            "Token transfer failed"
        );
    }

    function getRewardTokenBalance() external view returns (uint256) {
        return rewardToken.balanceOf(address(this));
    }

    function withdrawTokens(address _token) external onlyOwner {
        uint256 balance = IERC20(_token).balanceOf(address(this));
        require(balance > 0, "No balance to withdraw");
        require(
            IERC20(_token).transfer(msg.sender, balance),
            "Transfer failed"
        );
        emit TokensWithdrawn(_token, balance);
    }

    function pause() external onlyOwner {
        _pause();
    }

    function unpause() external onlyOwner {
        _unpause();
    }

    function getCaseDetails(
        uint256 _caseId
    )
        external
        view
        returns (
            uint256 price,
            uint256 totalWeight,
            bool isActive,
            Reward[] memory rewards
        )
    {
        require(_caseId < caseCount, "Case does not exist");
        Case storage c = cases[_caseId];
        return (c.price, c.totalWeight, c.isActive, c.rewards);
    }

    function getMaxReward(uint256 _caseId) public view returns (uint256) {
        require(_caseId < caseCount, "Case does not exist");
        Case storage c = cases[_caseId];
        uint256 maxReward = 0;
        for (uint256 i = 0; i < c.rewards.length; i++) {
            if (c.rewards[i].amount > maxReward) {
                maxReward = c.rewards[i].amount;
            }
        }
        return maxReward;
    }

    function getCasesOpenedByAddress(
        address _address,
        uint256 _caseId
    ) external view returns (uint256) {
        return casesOpenedByAddress[_address][_caseId];
    }
}

{
  "compilationTarget": {
    "contracts/VeniumCase.sol": "VeniumCasesV2"
  },
  "evmVersion": "london",
  "libraries": {},
  "metadata": {
    "bytecodeHash": "ipfs"
  },
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "remappings": []
}