class DemoShareDelegate: NSObject, ShareDelegate {
    func makeLink(queryItems: [URLQueryItem]) -> String {
        return "https://demo?" + queryItems
            .filter { $0.value != nil }
            .map { "\($0.name)=\($0.value!)" }
            .joined(separator: "&")
    }
}

//  let extensionDelegate = GRVExtensionDelegate()
extensionDelegate.shareDelegate = DemoShareDelegate();

class DemoShareDelegate: NSObject, ShareDelegate {

    func makeLink(queryItems: [URLQueryItem]) -> String {
        return "https://demo?" + queryItems
            .filter { $0.value != nil }
            .map { "\($0.name)=\($0.value!)" }
            .joined(separator: "&")
    }
   
    func items(for appId: String) -> [ShareItem] {
        let channel = "Custom"
        let custom = ShareItem(channel: channel, icon: nil) { context, viewController, completion in
            // do your share actionshare
            completion(true, channel)
        }
        return [custom, .system, .copyLink, .messages]
    }
}

class DemoNewShareDelegate: NSObject, ShareDelegate {
    var items: [ShareItem]?

    func makeLink(queryItems: [URLQueryItem]) -> String {
        return "https://demo?" + queryItems
            .filter { $0.value != nil }
            .map { "\($0.name)=\($0.value!)" }
            .joined(separator: "&")
    }
   
    func items(for appId: String) -> [ShareItem] {
        let channel = "Custom"
        let custom = ShareItem(channel: channel, icon: nil) { context, viewController, completion in
            // do your share actionshare
            completion(true, channel)
        }
        return [custom, .system, .copyLink, .messages]
    }

    func showPanel(items: [ShareItem], context: ShareContext, visibleViewController: UIViewController?, completion: @escaping Completion) {
        self.items = items

        let alertController = UIAlertController(title: context.title, message: context.desc, preferredStyle: .actionSheet)
        items
            .map { item in
                UIAlertAction(title: item.channel, style: .default) { [weak alertController] action in
                    // do your share action
                    guard let alertController else { return }
                    alertController.dismiss(animated: true) {
                        item.handler?(context, visibleViewController, completion)
                    }
                }
            }
            .forEach(alertController.addAction(_:))

        let cancelAction = UIAlertAction(title: "Cancel", style: .cancel)
        alertController.addAction(cancelAction)
        visibleViewController?.present(alertController, animated: true)
    }
}

@objc
public protocol ShareDelegate: NSObjectProtocol {
    typealias Completion = (_ result: Bool, _ channel: String?) -> Void

    /// Generates a URL string for sharing with additional query items included in the URL.
    /// - Parameters:
    ///    - queryItems: An array of `URLQueryItem` to add to the URL.
    /// - Returns: The URL string
    func makeLink(queryItems: [URLQueryItem]) -> String

    /// Retrieves an array of `ShareItem` objects for a given mini program ID.
    /// - Parameter appId: The ID of the mini program for which to retrieve sharing items.
    /// - Returns: An array of `ShareItem` objects.
    @objc optional
    func items(for appId: String) -> [ShareItem]

    /// Presents a sharing panel to the user, allowing them to share the given items in the given context.
    /// - Parameters:
    ///    - items: An array of `ShareItem` objects to display in the sharing panel.
    ///    - context: A `ShareContext` object that defines the context in which the sharing panel is being displayed.
    ///    - visibleViewController: The view controller from which to present the sharing panel. If none is specified, the topmost view controller will be used.
    ///    - completion: A completion handler that is called when sharing is complete or canceled.
    ///         - result: A boolean value indicating whether the sharing operation was successful.
    ///         - channel: An optional string value indicating the channel through which the item was shared.
    @objc optional
    func showPanel(items: [ShareItem], context: ShareContext, visibleViewController: UIViewController?, completion: @escaping Completion)
}

/// An object that represents a sharing channel.
@objcMembers
open class ShareItem: NSObject {
    
    public typealias Handler = (_ context: ShareContext, _ visibleViewController: UIViewController?, _ completion: @escaping ShareDelegate.Completion) -> Void
    
    /// The name of the sharing channel.
    public let channel: String
    
    /// The icon for the sharing channel.
    public let icon: UIImage?
    
    /// A boolean value indicating whether to use a short link for sharing.
    public let useShortLink: Bool
    
    /// A completion handler that is called when the sharing channel is selected.
    public var handler: Handler?
    
    /// Initializes a new `ShareItem` object.
    ///
    /// - Parameters:
    ///   - channel: The name of the sharing channel.
    ///   - icon: The icon for the sharing channel.
    ///   - useShortLink: A boolean value indicating whether to use a short link for sharing. Default is `false`.
    ///   - handler: A completion handler that is called when the sharing channel is selected. Default is `nil`.
    public init(channel: String, icon: UIImage?, useShortLink: Bool = false, handler: Handler? = nil) {
        self.channel = channel
        self.icon = icon
        self.useShortLink = useShortLink
        self.handler = handler
    }
}

public extension ShareItem {

    public static var messages: ShareItem { get }

    public static var copyLink: ShareItem { get }

    public static var system: ShareItem { get }
}