import SwiftUI
import AVFoundation

@main
struct MiniPlayerApp: App {
    @StateObject private var bridge = PlayerBridge()
    
    var body: some Scene {
        WindowGroup {
            ContentView(bridge: bridge)
                .frame(minWidth: 900, minHeight: 600)
                .onAppear { bridge.setup() }
        }
        #if os(macOS)
        .commands {
            CommandGroup(replacing: .newItem) {}
            CommandMenu("播放") {
                Button("播放/暂停") { bridge.togglePlayPause() }
                    .keyboardShortcut(" ", modifiers: [])
                Divider()
                Button("上一首") { bridge.playPrev() }
                    .keyboardShortcut("[", modifiers: [])
                Button("下一首") { bridge.playNext() }
                    .keyboardShortcut("]", modifiers: [])
                Divider()
                Button("全屏") { bridge.toggleFullscreen() }
                    .keyboardShortcut("f", modifiers: .command)
                Divider()
                Button("音量+") { bridge.adjustVolume(by: 0.1) }
                    .keyboardShortcut("=", modifiers: .command)
                Button("音量-") { bridge.adjustVolume(by: -0.1) }
                    .keyboardShortcut("-", modifiers: .command)
                Divider()
                Button("循环模式") { bridge.cycleRepeatMode() }
                    .keyboardShortcut("r", modifiers: .command)
            }
            CommandMenu("文件") {
                Button("打开文件...") { bridge.openFileDialog() }
                    .keyboardShortcut("o", modifiers: .command)
                Divider()
                Button("添加URL...") { bridge.showURLDialog = true }
                    .keyboardShortcut("u", modifiers: .command)
            }
        }
        #endif
    }
}

// MARK: - 主内容视图（直接SwiftUI，不经过BricksView）
struct ContentView: View {
    @ObservedObject var bridge: PlayerBridge
    
    var body: some View {
        ZStack {
            // 视频占满全部
            VideoPlayerRepresentable(player: bridge.player)
                .background(Color.black)
                .frame(maxWidth: .infinity, maxHeight: .infinity)
                .ignoresSafeArea()
            
            // 单击播放/暂停 + 双击全屏
            Color.clear
                .contentShape(Rectangle())
                .onTapGesture { bridge.togglePlayPause() }
                #if os(macOS)
                .onTapGesture(count: 2) { bridge.toggleFullscreen() }
                #endif
                .ignoresSafeArea()
            
            // Logo（左上角，始终显示）
            VStack {
                HStack {
                    Button(action: { bridge.showToolbar.toggle() }) {
                        Text("🎬")
                            .font(.system(size: 28))
                            .padding(8)
                            .background(.black.opacity(0.4))
                            .cornerRadius(10)
                    }
                    .buttonStyle(.plain)
                    Spacer()
                }
                .padding(.leading, 16)
                .padding(.top, 12)
                Spacer()
            }
            
            // 底部 Toolbar（半透明，点击logo才显示）
            if bridge.showToolbar {
                VStack {
                    Spacer()
                    ControlToolbar(bridge: bridge)
                        .transition(.move(edge: .bottom).combined(with: .opacity))
                }
            }
            
            // Toast
            if let msg = bridge.toastMessage {
                VStack {
                    Spacer()
                    Text(msg)
                        .padding(8)
                        .background(.black.opacity(0.7))
                        .foregroundColor(.white)
                        .cornerRadius(6)
                        .padding(.bottom, 100)
                }
            }
        }
        .sheet(isPresented: $bridge.showURLDialog) {
            URLInputDialog(bridge: bridge)
        }
        .sheet(isPresented: $bridge.showTrackDialog) {
            TrackSelectDialog(bridge: bridge)
        }
        .sheet(isPresented: $bridge.showPlaylistSheet) {
            PlaylistWindowView(bridge: bridge)
        }
        .animation(.easeInOut(duration: 0.25), value: bridge.showToolbar)
        .onReceive(NotificationCenter.default.publisher(for: .init("ExitFullscreen"))) { _ in
            bridge.toggleFullscreen()
        }
    }
}

// MARK: - 底部控制栏
struct ControlToolbar: View {
    @ObservedObject var bridge: PlayerBridge
    
    var body: some View {
        VStack(spacing: 6) {
            // 进度条行
            HStack(spacing: 8) {
                Text(bridge.currentTimeText)
                    .font(.system(size: 12, design: .monospaced))
                    .foregroundColor(.white)
                    .frame(width: 50, alignment: .trailing)
                
                ProgressSlider(player: bridge.player, bridge: bridge)
                    .frame(height: 20)
                
                Text(bridge.totalTimeText)
                    .font(.system(size: 12, design: .monospaced))
                    .foregroundColor(.white)
                    .frame(width: 50, alignment: .leading)
            }
            
            // 按钮行
            HStack(spacing: 10) {
                #if os(macOS)
                ToolbarButton(label: "📂 打开") { bridge.openFileDialog() }
                #endif
                ToolbarButton(label: "⏮") { bridge.playPrev() }
                ToolbarButton(label: bridge.isPlaying ? "⏸" : "▶️") { bridge.togglePlayPause() }
                ToolbarButton(label: "⏭") { bridge.playNext() }
                
                Spacer()
                
                // 音量控制
                ToolbarButton(label: "🔈") { bridge.adjustVolume(by: -0.1) }
                
                // 音量条
                GeometryReader { geo in
                    ZStack(alignment: .leading) {
                        RoundedRectangle(cornerRadius: 2)
                            .fill(Color.white.opacity(0.2))
                            .frame(height: 4)
                        RoundedRectangle(cornerRadius: 2)
                            .fill(Color.accentColor)
                            .frame(width: geo.size.width * CGFloat(bridge.volume), height: 4)
                    }
                    .contentShape(Rectangle())
                    .gesture(
                        DragGesture(minimumDistance: 0)
                            .onChanged { value in
                                let ratio = max(0, min(1, value.location.x / geo.size.width))
                                bridge.setVolume(Float(ratio))
                            }
                    )
                }
                .frame(width: 80, height: 20)
                
                Text("\(Int(bridge.volume * 100))")
                    .font(.system(size: 11, design: .monospaced))
                    .foregroundColor(.white.opacity(0.7))
                    .frame(width: 30)
                
                ToolbarButton(label: "🔊") { bridge.adjustVolume(by: 0.1) }
                
                Spacer()
                
                Text(bridge.currentTrackLabel)
                    .font(.system(size: 11))
                    .foregroundColor(.white.opacity(0.7))
                
                ToolbarButton(label: "🎵 音轨") { bridge.showTrackDialog = true }
                ToolbarButton(label: "\(bridge.repeatMode.icon) \(bridge.repeatMode.rawValue)") { bridge.cycleRepeatMode() }
                ToolbarButton(label: "⛶") { bridge.toggleFullscreen() }
                ToolbarButton(label: "📋 列表 (\(bridge.queue.count))") { bridge.togglePlaylistWindow() }
            }
        }
        .padding(.horizontal, 16)
        .padding(.vertical, 8)
        .background(.black.opacity(0.55))
    }
}

// MARK: - 半透明按钮
struct ToolbarButton: View {
    let label: String
    let action: () -> Void
    @State private var hovering = false
    
    var body: some View {
        Button(action: action) {
            Text(label)
                .font(.system(size: 13))
                .foregroundColor(.white)
                .padding(.horizontal, 8)
                .padding(.vertical, 4)
                .background(hovering ? .white.opacity(0.15) : .clear)
                .cornerRadius(4)
        }
        .buttonStyle(.plain)
        .onHover { hovering = $0 }
    }
}

// MARK: - 播放列表弹窗
struct PlaylistWindowView: View {
    @ObservedObject var bridge: PlayerBridge
    
    var body: some View {
        VStack(spacing: 0) {
            HStack {
                Button("📂 添加文件") { bridge.openFileDialog() }
                Button("🔗 添加URL") { bridge.showURLDialog = true }
                Spacer()
                Text("\(bridge.queue.count) 项")
                    .font(.caption).foregroundColor(.secondary)
            }
            .padding(12)
            .background(.regularMaterial)
            
            Divider()
            
            if bridge.queue.isEmpty {
                VStack { Spacer(); Text("暂无媒体").foregroundColor(.secondary); Spacer() }
            } else {
                ScrollView {
                    LazyVStack(spacing: 2) {
                        ForEach(Array(bridge.queue.enumerated()), id: \.element.id) { idx, item in
                            HStack {
                                if idx == bridge.currentIndex {
                                    Text("▶").foregroundColor(.accentColor).font(.caption)
                                }
                                VStack(alignment: .leading, spacing: 2) {
                                    Text(item.name).font(.system(size: 13)).lineLimit(1)
                                    Text(item.mediaType).font(.caption).foregroundColor(.secondary)
                                }
                                Spacer()
                                Button(role: .destructive) { bridge.removeItem(at: idx) } label: {
                                    Image(systemName: "trash").font(.caption)
                                }.buttonStyle(.plain)
                            }
                            .padding(.horizontal, 12).padding(.vertical, 8)
                            .background(idx == bridge.currentIndex ? Color.accentColor.opacity(0.15) : .clear)
                            .contentShape(Rectangle())
                            .onTapGesture { bridge.playIndex(idx) }
                        }
                    }
                }
            }
        }
        .frame(minWidth: 350, minHeight: 400)
    }
}

// MARK: - URL输入弹窗
struct URLInputDialog: View {
    @ObservedObject var bridge: PlayerBridge
    @State private var url = ""
    @Environment(\.dismiss) private var dismiss
    
    var body: some View {
        VStack(spacing: 16) {
            Text("添加媒体URL").font(.headline)
            TextField("https://example.com/video.m3u8", text: $url)
                .textFieldStyle(.roundedBorder)
            HStack {
                Button("取消") { dismiss() }
                Spacer()
                Button("添加") {
                    if !url.isEmpty { bridge.addURL(url); dismiss() }
                }
                .keyboardShortcut(.defaultAction)
                .disabled(url.isEmpty)
            }
        }
        .padding(20)
        .frame(width: 400)
    }
}

// MARK: - 音轨选择弹窗
struct TrackSelectDialog: View {
    @ObservedObject var bridge: PlayerBridge
    @Environment(\.dismiss) private var dismiss
    
    var body: some View {
        VStack(spacing: 12) {
            Text("选择音轨").font(.headline)
            ForEach(Array(bridge.availableTracks.enumerated()), id: \.offset) { idx, track in
                Button(action: { bridge.selectTrack(index: idx); dismiss() }) {
                    HStack {
                        Text("Track \(idx + 1)")
                        Spacer()
                        if idx == bridge.currentTrackIndex {
                            Text("✓").foregroundColor(.green)
                        }
                    }
                    .padding(8).contentShape(Rectangle())
                }.buttonStyle(.plain)
            }
            Divider()
            Button("关闭") { dismiss() }
        }
        .padding(20)
        .frame(minWidth: 250)
    }
}