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



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (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 anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing 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);
    }
}

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



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (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;
    }
}

// File: contracts/EditionsCounter.sol



// SPDX-License-Identifier: MIT
pragma solidity 0.8.17;

import "@openzeppelin/contracts/access/Ownable.sol";

import "./interfaces/ICounter.sol";

error NotAMarketplace();
error EditionsCantBeZero();

contract EditionsCounter is Ownable, ICounter {
    address marketplace;

    mapping(uint256 => uint256) public override remainingInListing;
    mapping(uint256 => bool) public override isListingFilled;

    mapping(uint256 => uint256) public override remainingInOffer;
    mapping(uint256 => bool) public override isOfferFilled;

    modifier onlyMarketplace() {
        if (msg.sender != marketplace) revert NotAMarketplace();

        _;
    }

    function initListing(
        uint256 listingID,
        uint256 allEditions
    ) external override onlyMarketplace {
        if (allEditions == 0) revert EditionsCantBeZero();
        remainingInListing[listingID] = allEditions;
    }

    function decreaseListing(
        uint256 listingID,
        uint256 selling
    ) external override onlyMarketplace {
        remainingInListing[listingID] -= selling;

        if (remainingInListing[listingID] == 0)
            isListingFilled[listingID] = true;
    }

    function initOffer(
        uint256 offerID,
        uint256 allEditions
    ) external override onlyMarketplace {
        if (allEditions == 0) revert EditionsCantBeZero();
        remainingInOffer[offerID] = allEditions;
    }

    function decreaseOffer(
        uint256 offerID,
        uint256 selling
    ) external override onlyMarketplace {
        remainingInOffer[offerID] -= selling;

        if (remainingInOffer[offerID] == 0) isOfferFilled[offerID] = true;
    }

    function setMarketplace(address newMarketplace) external onlyOwner {
        marketplace = newMarketplace;
    }
}

// File: contracts/interfaces/ICounter.sol



// SPDX-License-Identifier: MIT
pragma solidity 0.8.17;

interface ICounter {
    function remainingInListing(
        uint256 listingID
    ) external view returns (uint256);

    function isListingFilled(uint256 listingID) external view returns (bool);

    function initListing(uint256 listingID, uint256 remainingEditions) external;

    function decreaseListing(uint256 listingID, uint256 selling) external;

    function remainingInOffer(uint256 offerID) external view returns (uint256);

    function isOfferFilled(uint256 offerID) external view returns (bool);

    function initOffer(uint256 offerID, uint256 remainingEditions) external;

    function decreaseOffer(uint256 offerID, uint256 selling) external;
}