// 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
// 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
// Compatible with OpenZeppelin Contracts ^5.0.0
pragma solidity ^0.8.20;

import {Ownable} from "@openzeppelin/contracts/access/Ownable.sol";

contract IdleArenaContract is Ownable {
    // Mapping to store campaign stage ID for each user
    mapping(address => uint256) public userCampaignStage;

    // Mapping to store gold balance for each user
    mapping(address => uint256) public userGold;

    // Mapping to store gem balance for each user
    mapping(address => uint256) public userGems;

    // Events
    event GoldChanged(
        address indexed user,
        uint256 oldAmount,
        uint256 newAmount,
        bool isReceived
    );
    event GemsChanged(
        address indexed user,
        uint256 oldAmount,
        uint256 newAmount,
        bool isReceived
    );
    event CampaignStageUpdated(
        address indexed user,
        uint256 oldStage,
        uint256 newStage
    );

    constructor(address initialOwner) Ownable(initialOwner) {}

    /**
     * @dev Updates the current campaign stage for the caller
     * @param stageId The ID of the campaign stage
     * @return The new campaign stage ID
     */
    function updateCampaignStage(uint256 stageId) external returns (uint256) {
        uint256 oldStage = userCampaignStage[msg.sender];
        require(
            stageId > oldStage,
            "New stage must be higher than current stage"
        );
        userCampaignStage[msg.sender] = stageId;

        emit CampaignStageUpdated(msg.sender, oldStage, stageId);

        return stageId;
    }

    /**
     * @dev Adds gold to the user's balance
     * @param amount The amount of gold to add
     * @return The new gold balance
     */
    function receiveGold(uint256 amount) external returns (uint256) {
        uint256 oldAmount = userGold[msg.sender];
        uint256 newAmount = oldAmount + amount;
        userGold[msg.sender] = newAmount;

        emit GoldChanged(msg.sender, oldAmount, newAmount, true);

        return newAmount;
    }

    /**
     * @dev Subtracts gold from the user's balance
     * @param amount The amount of gold to subtract
     * @return The new gold balance
     */
    function consumeGold(uint256 amount) external returns (uint256) {
        uint256 oldAmount = userGold[msg.sender];
        require(oldAmount >= amount, "Insufficient gold balance");
        uint256 newAmount = oldAmount - amount;
        userGold[msg.sender] = newAmount;

        emit GoldChanged(msg.sender, oldAmount, newAmount, false);

        return newAmount;
    }

    /**
     * @dev Adds gems to the user's balance
     * @param amount The amount of gems to add
     * @return The new gem balance
     */
    function receiveGems(uint256 amount) external returns (uint256) {
        uint256 oldAmount = userGems[msg.sender];
        uint256 newAmount = oldAmount + amount;
        userGems[msg.sender] = newAmount;

        emit GemsChanged(msg.sender, oldAmount, newAmount, true);

        return newAmount;
    }

    /**
     * @dev Subtracts gems from the user's balance
     * @param amount The amount of gems to subtract
     * @return The new gem balance
     */
    function consumeGems(uint256 amount) external returns (uint256) {
        uint256 oldAmount = userGems[msg.sender];
        require(oldAmount >= amount, "Insufficient gem balance");
        uint256 newAmount = oldAmount - amount;
        userGems[msg.sender] = newAmount;

        emit GemsChanged(msg.sender, oldAmount, newAmount, false);

        return newAmount;
    }
}