import SwiftUI
import AVFoundation
import Combine

@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(L.playback) {
                Button(L.playPause) { bridge.togglePlayPause() }
                    .keyboardShortcut(" ", modifiers: [])
                Divider()
                Button(L.prev) { bridge.playPrev() }
                    .keyboardShortcut("[", modifiers: [])
                Button(L.next) { bridge.playNext() }
                    .keyboardShortcut("]", modifiers: [])
                Divider()
                Button(L.fullscreen) { bridge.toggleFullscreen() }
                    .keyboardShortcut("f", modifiers: .command)
                Divider()
                Button(L.volUp) { bridge.adjustVolume(by: 0.1) }
                    .keyboardShortcut("=", modifiers: .command)
                Button(L.volDown) { bridge.adjustVolume(by: -0.1) }
                    .keyboardShortcut("-", modifiers: .command)
                Divider()
                Button(L.repeatMode) { bridge.cycleRepeatMode() }
                    .keyboardShortcut("r", modifiers: .command)
            }
            CommandMenu(L.file) {
                Button(L.openFile) { bridge.openFileDialog() }
                    .keyboardShortcut("o", modifiers: .command)
                Divider()
                Button(L.addURL) { bridge.showURLDialog = true }
                    .keyboardShortcut("u", modifiers: .command)
            }
        }
        #endif
    }
}

// MARK: - 主内容视图
struct ContentView: View {
    @ObservedObject var bridge: PlayerBridge
    // 自动隐藏：本地状态，不经过 bridge 的 @Published
    @State private var toolbarVisible = false
    @State private var isHoveringToolbar = false
    @State private var lastInteraction = Date()
    private let hideTimer = Timer.publish(every: 2, on: .main, in: .common).autoconnect()
    private let autoHideInterval: TimeInterval = 60
    
    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()
                    touchInteraction()
                }
                #if os(macOS)
                .onTapGesture(count: 2) { bridge.toggleFullscreen() }
                #endif
                .ignoresSafeArea()
            
            // Logo（左上角，始终显示）
            VStack {
                HStack {
                    Button(action: {
                        toolbarVisible.toggle()
                        if toolbarVisible { touchInteraction() }
                    }) {
                        MiniPlayerIcon()
                            .frame(width: 36, height: 36)
                            .padding(6)
                            .background(.black.opacity(0.4))
                            .cornerRadius(10)
                    }
                    .buttonStyle(.plain)
                    Spacer()
                }
                .padding(.leading, 16)
                .padding(.top, 12)
                Spacer()
            }
            
            // 底部 Toolbar（半透明）
            if toolbarVisible {
                VStack {
                    Spacer()
                    ControlToolbar(bridge: bridge, isHovering: $isHoveringToolbar, onTouch: touchInteraction)
                        .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: toolbarVisible)
        // 自动隐藏 Timer：每2秒检查一次
        .onReceive(hideTimer) { _ in
            guard toolbarVisible else { return }
            if isHoveringToolbar { lastInteraction = Date(); return }
            if Date().timeIntervalSince(lastInteraction) >= autoHideInterval {
                toolbarVisible = false
            }
        }
        // 全屏退出通知 — async 避免在 SwiftUI 更新周期内操作 NSWindow
        .onReceive(NotificationCenter.default.publisher(for: .init("ExitFullscreen"))) { _ in
            DispatchQueue.main.async { [bridge] in
                bridge.toggleFullscreen()
            }
        }
    }
    
    private func touchInteraction() {
        lastInteraction = Date()
    }
}

// MARK: - 底部控制栏
struct ControlToolbar: View {
    @ObservedObject var bridge: PlayerBridge
    @Binding var isHovering: Bool
    let onTouch: () -> Void
    
    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: "📂 \(L.open)") { bridge.openFileDialog(); onTouch() }
                #endif
                ToolbarButton(label: "⏮") { bridge.playPrev(); onTouch() }
                ToolbarButton(label: bridge.isPlaying ? "⏸" : "▶️") { bridge.togglePlayPause(); onTouch() }
                ToolbarButton(label: "⏭") { bridge.playNext(); onTouch() }
                
                Spacer()
                
                // 音量控制
                ToolbarButton(label: "🔈") { bridge.adjustVolume(by: -0.1); onTouch() }
                
                // 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))
                                onTouch()
                            }
                    )
                }
                .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); onTouch() }
                
                Spacer()
                
                Text(bridge.currentTrackLabel)
                    .font(.system(size: 11))
                    .foregroundColor(.white.opacity(0.7))
                
                ToolbarButton(label: L.audioTrack) { bridge.showTrackDialog = true; onTouch() }
                ToolbarButton(label: "\(bridge.repeatMode.icon) \(bridge.repeatMode.displayName)") { bridge.cycleRepeatMode(); onTouch() }
                ToolbarButton(label: "⛶") { bridge.toggleFullscreen(); onTouch() }
                ToolbarButton(label: "📋 \(L.list) (\(bridge.queue.count))") { bridge.togglePlaylistWindow(); onTouch() }
            }
        }
        .padding(.horizontal, 16)
        .padding(.vertical, 8)
        .background(.black.opacity(0.55))
        .onHover { hovering in
            isHovering = hovering
            if hovering { onTouch() }
        }
    }
}

// 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(L.addFile) { bridge.openFileDialog() }
                Button(L.addURLBtn) { bridge.showURLDialog = true }
                Spacer()
                Text("\(bridge.queue.count) \(L.itemsCount)")
                    .font(.caption).foregroundColor(.secondary)
            }
            .padding(12)
            .background(.regularMaterial)
            
            Divider()
            
            if bridge.queue.isEmpty {
                VStack { Spacer(); Text(L.noMedia).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(L.addMediaURL).font(.headline)
            TextField("https://example.com/video.m3u8", text: $url)
                .textFieldStyle(.roundedBorder)
            HStack {
                Button(L.cancel) { dismiss() }
                Spacer()
                Button(L.add) {
                    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(L.selectTrack).font(.headline)
            ForEach(Array(bridge.availableTracks.enumerated()), id: \.offset) { idx, track in
                Button(action: { bridge.selectTrack(index: idx); dismiss() }) {
                    HStack {
                        Text("\(L.track) \(idx + 1)")
                        Spacer()
                        if idx == bridge.currentTrackIndex {
                            Text("✓").foregroundColor(.green)
                        }
                    }
                    .padding(8).contentShape(Rectangle())
                }.buttonStyle(.plain)
            }
            Divider()
            Button(L.close) { dismiss() }
        }
        .padding(20)
        .frame(minWidth: 250)
    }
}