import SwiftUI
import AVKit
@preconcurrency import MediaPlayer

// Global video player state
class SharedVideoManager: ObservableObject {
    static let shared = SharedVideoManager()
    
    @Published var currentVideoURL: URL?
    @Published var showFullScreenPlayer = false
    @Published var isInPiPMode = false
    
    // Track the current player to force PiP stop
    weak var currentPlayerController: AVPlayerViewController?
    
    // Store current media info for lock screen controls
    var currentTitle: String?
    var currentArtworkURL: String?
    
    private init() {

    }
    
    func playVideo(url: URL, title: String? = nil, artworkURL: String? = nil) {
        // Store media info for lock screen controls
        currentTitle = title
        currentArtworkURL = artworkURL
        
        // If we already have a video playing, we need to switch to the new one
        if currentVideoURL != nil {
            if isInPiPMode {
                // Force stop PiP if it's active
                if let playerController = currentPlayerController {
                    // Force stop the player to close PiP
                    playerController.player?.pause()
                    playerController.player = nil
                }
            }
            
            // Clear the old video first to ensure proper cleanup
            currentVideoURL = nil
            showFullScreenPlayer = false
            isInPiPMode = false
            currentPlayerController = nil
            
            // Small delay to let old player fully cleanup before starting new one
            DispatchQueue.main.asyncAfter(deadline: .now() + 0.2) {
                self.currentVideoURL = url
                self.showFullScreenPlayer = true
                self.isInPiPMode = false
                
            }
        } else {
            // No existing video, start immediately
            currentVideoURL = url
            showFullScreenPlayer = true
            isInPiPMode = false
            
        }
    }
    
    func hideFullScreenPlayer() {
        showFullScreenPlayer = false
    }
    
    func stopVideo() {
        // Stop the actual player first
        if let playerController = currentPlayerController {
            playerController.player?.pause()
            playerController.player = nil
        }
        
        // Clear all state
        currentVideoURL = nil
        showFullScreenPlayer = false
        isInPiPMode = false
        currentPlayerController = nil
        currentTitle = nil
        currentArtworkURL = nil
        
    }
    
    func setPiPMode(_ isPiP: Bool) {
        isInPiPMode = isPiP
        if isPiP {
            // When PiP starts, hide full screen but DON'T touch currentVideoURL
            showFullScreenPlayer = false
        } else {
            // When PiP ends, show full screen again
            showFullScreenPlayer = true
        }
    }
    
}

// Shared video overlay that exists at app level - GLOBAL PERSISTENT PLAYER
struct SharedVideoOverlay: View {
    @StateObject private var videoManager = SharedVideoManager.shared
    @State private var currentPlayerURL: URL?
    
    var body: some View {
        ZStack {
            // ALWAYS render the persistent player when we have a URL
            // Force recreate when URL changes to ensure old player is destroyed
            if let url = videoManager.currentVideoURL {
                PersistentVideoPlayer(url: url)
                    .id(url.absoluteString) // Force recreate when URL changes
                    .opacity(videoManager.showFullScreenPlayer ? 1 : 0) // Show/hide but never destroy
                    .allowsHitTesting(videoManager.showFullScreenPlayer) // Only interactive when visible
                    .background(videoManager.showFullScreenPlayer ? Color.black : Color.clear)
                    .ignoresSafeArea()
                    .onAppear {
                
                    }
            }
        }
        .onChange(of: videoManager.showFullScreenPlayer) { _, isVisible in
    
        }
        .onChange(of: videoManager.currentVideoURL) { oldURL, newURL in
            if let old = oldURL, let new = newURL, old != new {
        
            } else if newURL == nil {
        
            }
        }
    }
}

// Persistent video player that stays alive
struct PersistentVideoPlayer: View {
    let url: URL
    
    var body: some View {
        VideoPlayerView(url: url)
            .onAppear {
        
            }
            .onDisappear {
        
            }
    }
}