//
//  Copyright (c) 2023 Touch Instinct
//
//  Permission is hereby granted, free of charge, to any person obtaining a copy
//  of this software and associated documentation files (the Software), to deal
//  in the Software without restriction, including without limitation the rights
//  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
//  copies of the Software, and to permit persons to whom the Software is
//  furnished to do so, subject to the following conditions:
//
//  The above copyright notice and this permission notice shall be included in
//  all copies or substantial portions of the Software.
//
//  THE SOFTWARE IS PROVIDED AS IS, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
//  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
//  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
//  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
//  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
//  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
//  THE SOFTWARE.
//

import Foundation
import TISwiftUtils
import UIKit

open class BaseNavigationStackDeeplinkHandler<Deeplink>: DeeplinkHandler {

    public var rootViewController: UIViewController
    public var asAnyHandlerClosure: Closure<UIViewController, AnyDeeplinkHandler<Deeplink>?>

    public init(rootViewController: UIViewController,
                asAnyHandlerClosure: @escaping Closure<UIViewController, AnyDeeplinkHandler<Deeplink>?>) {

        self.rootViewController = rootViewController
        self.asAnyHandlerClosure = asAnyHandlerClosure
    }

    // MARK: - DeeplinkHandler

    open func handle(deeplink: Deeplink) -> Operation? {
        if let handler = asAnyHandlerClosure(rootViewController),
           let operation = handler.handle(deeplink: deeplink) {
            return operation
        }

        let (_, operation) = findHandler(for: deeplink, in: rootViewController)

        return operation
    }

    // MARK: - Open methods

    open func findHandler(for deeplink: Deeplink,
                          in viewController: UIViewController) -> (AnyDeeplinkHandler<Deeplink>?, Operation?) {

        switch viewController {
        case let navController as UINavigationController:
            for controllerInNavigationStack in navController.viewControllers.reversed() {
                if let handler = asAnyHandlerClosure(controllerInNavigationStack),
                   let operation = handler.handle(deeplink: deeplink) {
                    return (handler, operation)
                }
            }

        case let tabController as UITabBarController:
            if let selectedController = tabController.selectedViewController,
               let handler = asAnyHandlerClosure(selectedController),
               let operation = handler.handle(deeplink: deeplink) {
                return (handler, operation)

            } else if var tabControllers = tabController.viewControllers {
                if tabController.selectedIndex != NSNotFound {
                    tabControllers.remove(at: tabController.selectedIndex)
                }

                for tabController in tabControllers {
                    if let handler = asAnyHandlerClosure(tabController),
                       let operation = handler.handle(deeplink: deeplink) {
                        return (handler, operation)
                    }
                }
            }

        default:
            let handler = asAnyHandlerClosure(viewController)
            let operation = handler?.handle(deeplink: deeplink)

            return (handler, operation)
        }

        return (nil, nil)
    }
}