import SwiftUI
import SwiftData
import AVKit

// MARK: - Constants
private enum MediaURLs {
    static let videoURL = "https://cdn.memorywake.com/users/7363409620351717377/files/7366657553935241216/39C069E1-7C3E-4261-8486-12058F855B38.mov"
    static let imageURL = "https://cdn.fairclip.cn/files/7343228671693557760/20250604-164000.jpg"
    static let VideoBlindURL = "https://cdn.memorywake.com/users/7363409620351717377/files/7366658779259211776/AD970D28-9D1E-4817-A245-F11967441B8F.mp4"
}

extension Notification.Name {
    static let navigateToMediaViewer = Notification.Name("navigateToMediaViewer")
}

// MARK: - 主视图
struct VisualEffectView: UIViewRepresentable {
    var effect: UIVisualEffect?
    
    func makeUIView(context: Context) -> UIVisualEffectView {
        let view = UIVisualEffectView(effect: nil)
        
        // Use a simpler approach without animator
        let blurEffect = UIBlurEffect(style: .systemUltraThinMaterialLight)
        
        // Create a custom blur effect with reduced intensity
        let blurView = UIVisualEffectView(effect: blurEffect)
        blurView.alpha = 0.3 // Reduce intensity
        
        // Add a white background with low opacity for better frosted effect
        let backgroundView = UIView()
        backgroundView.backgroundColor = UIColor.white.withAlphaComponent(0.1)
        backgroundView.autoresizingMask = [.flexibleWidth, .flexibleHeight]
        
        view.contentView.addSubview(backgroundView)
        view.contentView.addSubview(blurView)
        blurView.frame = view.bounds
        blurView.autoresizingMask = [.flexibleWidth, .flexibleHeight]
        
        return view
    }
    
    func updateUIView(_ uiView: UIVisualEffectView, context: Context) {
        // No need to update the effect
    }
}

struct AVPlayerController: UIViewControllerRepresentable {
    @Binding var player: AVPlayer?
    
    func makeUIViewController(context: Context) -> AVPlayerViewController {
        let controller = AVPlayerViewController()
        controller.player = player
        controller.showsPlaybackControls = false
        controller.videoGravity = .resizeAspect
        controller.view.backgroundColor = .clear
        return controller
    }
    
    func updateUIViewController(_ uiViewController: AVPlayerViewController, context: Context) {
        uiViewController.player = player
    }
}

struct BlindBoxView: View {
    enum BlindBoxMediaType {
        case video
        case image
    }
    
    let mediaType: BlindBoxMediaType
    @State private var showLottieAnimation = true
    @State private var showScalingOverlay = false
    @State private var scale: CGFloat = 0.1
    @State private var videoPlayer: AVPlayer?
    @State private var showControls = false
    @State private var isAnimating = true
    @State private var aspectRatio: CGFloat = 1.0
    @State private var isPortrait: Bool = false
    @State private var displayImage: UIImage?
    
    init(mediaType: BlindBoxMediaType) {
        self.mediaType = mediaType
    }

    private func loadMedia() {
        switch mediaType {
        case .video:
            loadVideo()
        case .image:
            loadImage()
        }
    }
    
    private func loadImage() {
        guard let url = URL(string: MediaURLs.imageURL) else { return }
        URLSession.shared.dataTask(with: url) { data, _, _ in
            if let data = data, let image = UIImage(data: data) {
                DispatchQueue.main.async {
                    self.displayImage = image
                    self.aspectRatio = image.size.width / image.size.height
                    self.isPortrait = image.size.height > image.size.width
                }
            }
        }.resume()
    }
    
    private func loadVideo() {
        guard let url = URL(string: MediaURLs.videoURL) else { return }
        let asset = AVAsset(url: url)
        let playerItem = AVPlayerItem(asset: asset)
        let player = AVPlayer(playerItem: playerItem)
        
        let videoTracks = asset.tracks(withMediaType: .video)
        if let videoTrack = videoTracks.first {
            let size = videoTrack.naturalSize.applying(videoTrack.preferredTransform)
            let width = abs(size.width)
            let height = abs(size.height)
            
            aspectRatio = width / height
            isPortrait = height > width
        }
        
        player.isMuted = true
        self.videoPlayer = player
    }
    
    private func startScalingAnimation() {
        self.scale = 0.1
        self.showScalingOverlay = true
        
        withAnimation(.spring(response: 2.0, dampingFraction: 0.5, blendDuration: 0.8)) {
            self.scale = 1.0
        }
    }
    
    // MARK: - Computed Properties
    private var scaledWidth: CGFloat {
        if isPortrait {
            return UIScreen.main.bounds.height * scale * 1/aspectRatio
        } else {
            return UIScreen.main.bounds.width * scale
        }
    }
    
    private var scaledHeight: CGFloat {
        if isPortrait {
            return UIScreen.main.bounds.height * scale
        } else {
            return UIScreen.main.bounds.width * scale * 1/aspectRatio
        }
    }
    
    var body: some View {
        ZStack {
            Color.themeTextWhiteSecondary.ignoresSafeArea()
            
            if showScalingOverlay {
                ZStack {
                    VisualEffectView(effect: UIBlurEffect(style: .systemUltraThinMaterialLight))
                        .opacity(0.3)
                        .edgesIgnoringSafeArea(.all)
                    
                    Group {
                        if mediaType == .video, let player = videoPlayer {
                            // Video Player
                            AVPlayerController(player: $videoPlayer)
                                .frame(width: scaledWidth, height: scaledHeight)
                                .opacity(scale == 1 ? 1 : 0.7)
                                .onAppear { player.play() }
                                
                        } else if mediaType == .image, let image = displayImage {
                            // Image View
                            Image(uiImage: image)
                                .resizable()
                                .scaledToFit()
                                .frame(width: scaledWidth, height: scaledHeight)
                                .opacity(scale == 1 ? 1 : 0.7)
                        }
                    }
                    .onTapGesture {
                        withAnimation(.easeInOut(duration: 0.1)) {
                            showControls.toggle()
                        }
                    }
                    
                    // 返回按钮
                    if showControls {
                        VStack {
                            HStack {
                                Button(action: {
                                    // 导航到BlindOutcomeView
                                    if mediaType == .video, let videoURL = URL(string: MediaURLs.videoURL) {
                                        Router.shared.navigate(to: .blindOutcome(media: .video(videoURL, nil)))
                                    } else if mediaType == .image, let image = displayImage {
                                        Router.shared.navigate(to: .blindOutcome(media: .image(image)))
                                    }
                                }) {
                                    Image(systemName: "chevron.left.circle.fill")
                                        .font(.system(size: 36))
                                        .foregroundColor(.black)
                                        .padding(12)
                                        .clipShape(Circle())
                                }
                                Spacer()
                            }
                            Spacer()
                        }
                        .frame(maxWidth: .infinity, maxHeight: .infinity)
                        .padding(.top, 50)
                        .padding(.leading, 20)
                        .zIndex(1000)
                        .transition(.opacity)
                        .onAppear {
                            // 2秒后显示按钮
                            DispatchQueue.main.asyncAfter(deadline: .now() + 2) {
                                withAnimation(.easeInOut(duration: 0.3)) {
                                    showControls = true
                                }
                            }
                        }
                    }
                }
                .frame(maxWidth: .infinity, maxHeight: .infinity)
                .animation(.easeInOut(duration: 1.0), value: scale)
                .ignoresSafeArea()
                .onAppear {
                    DispatchQueue.main.asyncAfter(deadline: .now() + 0.2) {
                        withAnimation(.spring(response: 2.5, dampingFraction: 0.6, blendDuration: 1.0)) {
                            self.scale = 1.0
                        }
                    }
                }
            } else {
                // Original content
                VStack {
                    VStack(spacing: 20) {
                        // 标题
                        VStack(alignment: .leading, spacing: 4) { 
                            Text("Hi! Click And")
                            Text("Open Your First Box~")
                        }
                        .font(Typography.font(for: .smallLargeTitle))
                        .fontWeight(.bold)
                        .foregroundColor(Color.themeTextMessageMain)
                        .frame(maxWidth: .infinity, alignment: .leading)
                        .padding(.horizontal)
                        .opacity(showScalingOverlay ? 0 : 1)
                        .offset(y: showScalingOverlay ? -UIScreen.main.bounds.height * 0.2 : 0)
                        .animation(.easeInOut(duration: 0.5), value: showScalingOverlay)
                        
                        // 盲盒
                        ZStack {
                            // 1. 背景SVG
                            if !showScalingOverlay {
                                SVGImage(svgName: "BlindBoxBg")
                                    .frame(
                                        width: UIScreen.main.bounds.width * 1.8,
                                        height: UIScreen.main.bounds.height * 0.85
                                    )
                                    .position(x: UIScreen.main.bounds.width / 2, 
                                            y: UIScreen.main.bounds.height * 0.325)
                                    .opacity(showScalingOverlay ? 0 : 1)
                                    .animation(.easeOut(duration: 1.5), value: showScalingOverlay)
                            }
                            
                            if !showScalingOverlay {
                                VStack(spacing: 20) {
                                    let player = AVPlayer(url: URL(string: MediaURLs.VideoBlindURL)!)
                                    VideoPlayer(player: player)
                                        .background(TransparentVideoPlayer())
                                        .frame(width: 300, height: 300)
                                        .onAppear {
                                            player.play()
                                            player.isMuted = true
                                        }
                                        .onDisappear {
                                            player.pause()
                                        }
                                }
                                .compositingGroup()
                                .padding()
                            }
                        }
                        .frame(
                            maxWidth: .infinity,
                            maxHeight: UIScreen.main.bounds.height * 0.65
                        )
                        .opacity(showScalingOverlay ? 0 : 1)
                        .animation(.easeOut(duration: 1.5), value: showScalingOverlay)
                        .offset(y: showScalingOverlay ? -100 : 0)
                        .animation(.easeInOut(duration: 1.5), value: showScalingOverlay)
                    }
                    .frame(maxWidth: .infinity, maxHeight: .infinity)
                    .background(Color.themeTextWhiteSecondary)
                    .edgesIgnoringSafeArea(.all)
                }
            }
        }
        .navigationBarBackButtonHidden(true)
        .onAppear {
            self.loadMedia()
            // Start animation after media is loaded
            DispatchQueue.main.asyncAfter(deadline: .now() + 5) {
                self.startScalingAnimation()
            }
        }
    }
}

// MARK: - 预览
#Preview {
    BlindBoxView(mediaType: .video)
}

struct TransparentVideoPlayer: UIViewRepresentable {
    func makeUIView(context: Context) -> UIView {
        let view = UIView()
        view.backgroundColor = .clear
        view.isOpaque = false
        return view
    }
    
    func updateUIView(_ uiView: UIView, context: Context) {}
}