//
//  SceneDelegate.swift
//  Mastodon
//
//  Created by MainasuK Cirno on 2021/1/22.
//

import UIKit
import Combine
import CoreDataStack

#if DEBUG
import FPSIndicator
#endif

class SceneDelegate: UIResponder, UIWindowSceneDelegate {

    var disposeBag = Set<AnyCancellable>()
    var observations = Set<NSKeyValueObservation>()
    
    var window: UIWindow?
    var coordinator: SceneCoordinator?

    #if DEBUG
    var fpsIndicator: FPSIndicator?
    #endif


    func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) {
        guard let windowScene = scene as? UIWindowScene else { return }
        
        let window = UIWindow(windowScene: windowScene)
        self.window = window

        // set tint color
        window.tintColor = Asset.Colors.brandBlue.color

        ThemeService.shared.currentTheme
            .receive(on: RunLoop.main)
            .dropFirst()
            .sink { [weak self] theme in
                guard let self = self else { return }
                guard let window = self.window else { return }
                window.subviews.forEach { view in
                    view.removeFromSuperview()
                    window.addSubview(view)
                }
            }
            .store(in: &disposeBag)
        
        let appContext = AppContext.shared
        let sceneCoordinator = SceneCoordinator(scene: scene, sceneDelegate: self, appContext: appContext)
        self.coordinator = sceneCoordinator
        
        sceneCoordinator.setup()
        sceneCoordinator.setupOnboardingIfNeeds(animated: false)
        window.makeKeyAndVisible()
        
        UserDefaults.shared.observe(\.customUserInterfaceStyle, options: [.initial, .new]) { [weak self] defaults, _ in
            guard let self = self else { return }
            self.window?.overrideUserInterfaceStyle = defaults.customUserInterfaceStyle
        }
        .store(in: &observations)

        #if DEBUG
        fpsIndicator = FPSIndicator(windowScene: windowScene)
        #endif
    }

    func sceneDidDisconnect(_ scene: UIScene) {
        // Called as the scene is being released by the system.
        // This occurs shortly after the scene enters the background, or when its session is discarded.
        // Release any resources associated with this scene that can be re-created the next time the scene connects.
        // The scene may re-connect later, as its session was not necessarily discarded (see `application:didDiscardSceneSessions` instead).
    }

    func sceneDidBecomeActive(_ scene: UIScene) {
        // Called when the scene has moved from an inactive state to an active state.
        // Use this method to restart any tasks that were paused (or not yet started) when the scene was inactive.

        // reset notification badge
        UserDefaults.shared.notificationBadgeCount = 0
        UIApplication.shared.applicationIconBadgeNumber = 0

        // trigger status filter update
        AppContext.shared.statusFilterService.filterUpdatePublisher.send()
    }

    func sceneWillResignActive(_ scene: UIScene) {
        // Called when the scene will move from an active state to an inactive state.
        // This may occur due to temporary interruptions (ex. an incoming phone call).
    }

    func sceneWillEnterForeground(_ scene: UIScene) {
        // Called as the scene transitions from the background to the foreground.
        // Use this method to undo the changes made on entering the background.
    }

    func sceneDidEnterBackground(_ scene: UIScene) {
        // Called as the scene transitions from the foreground to the background.
        // Use this method to save data, release shared resources, and store enough scene-specific state information
        // to restore the scene back to its current state.
        AppContext.shared.audioPlaybackService.pauseIfNeed()
    }


}

#if DEBUG
class TestWindow: UIWindow {
    
    override func sendEvent(_ event: UIEvent) {
        event.allTouches?.forEach({ (touch) in
            let location = touch.location(in: self)
            let view = hitTest(location, with: event)
            print(view.debugDescription)
        })
        
        super.sendEvent(event)
    }
}
#endif