//
//  Werkout_iosApp.swift
//  Werkout_ios
//
//  Created by Trey Tartt on 6/13/23.
//

import SwiftUI
import Combine

@main
struct Werkout_iosApp: App {
    let persistenceController = PersistenceController.shared
    @ObservedObject var bridgeModule = BridgeModule.shared
    @State var additionalWindows: [UIWindow] = []
    
    private var screenDidConnectPublisher: AnyPublisher<UIScreen, Never> {
        NotificationCenter.default
            .publisher(for: UIScreen.didConnectNotification)
            .compactMap { $0.object as? UIScreen }
            .receive(on: RunLoop.main)
            .eraseToAnyPublisher()
    }
    
    private var screenDidDisconnectPublisher: AnyPublisher<UIScreen, Never> {
        NotificationCenter.default
            .publisher(for: UIScreen.didDisconnectNotification)
            .compactMap { $0.object as? UIScreen }
            .receive(on: RunLoop.main)
            .eraseToAnyPublisher()
    }
    
    var body: some Scene {
        WindowGroup {
            MainView()
                .environmentObject(bridgeModule)
                .onReceive(
                    screenDidConnectPublisher,
                    perform: screenDidConnect
                )
                .onReceive(
                    screenDidDisconnectPublisher,
                    perform: screenDidDisconnect
                )
        }
    }

    private func screenDidDisconnect(_ screen: UIScreen) {
        additionalWindows.removeAll { $0.screen == screen }
        bridgeModule.isShowingOnExternalDisplay = false
    }
    
    private func screenDidConnect(_ screen: UIScreen) {
        let window = UIWindow(frame: screen.bounds)
        
        window.windowScene = UIApplication.shared.connectedScenes
            .first { ($0 as? UIWindowScene)?.screen == screen }
        as? UIWindowScene
        
        let view = ExternalWorkoutDetailView()
            .environmentObject(bridgeModule)
        let controller = UIHostingController(rootView: view)
        window.rootViewController = controller
        window.isHidden = false
        additionalWindows.append(window)
        bridgeModule.isShowingOnExternalDisplay = true
    }
}