import SwiftUI
import FlixyDesign
import FlixyPlayback

/// Auswahl von Ton- und Untertitelspur.
struct TrackPickerSheet: View {
    let model: PlayerModel

    @Environment(\.dismiss) private var dismiss
    @Environment(\.flixyAccent) private var accent

    var body: some View {
        NavigationStack {
            List {
                if !model.audioTracks.isEmpty {
                    Section("player.audioTracks") {
                        ForEach(model.audioTracks) { track in
                            row(
                                title: track.displayName,
                                isSelected: model.selectedAudioTrack == track
                            ) {
                                model.selectAudioTrack(track)
                            }
                        }
                    }
                }

                if !model.subtitleTracks.isEmpty {
                    Section("player.subtitleTracks") {
                        // „Aus" gehört in dieselbe Liste wie die Spuren, nicht
                        // als eigener Schalter daneben: es ist eine Auswahl
                        // unter mehreren, keine getrennte Eigenschaft.
                        row(
                            title: String(localized: "player.subtitlesOff"),
                            isSelected: model.selectedSubtitleTrack == nil
                        ) {
                            model.selectSubtitleTrack(nil)
                        }

                        ForEach(model.subtitleTracks) { track in
                            row(
                                title: track.displayName,
                                isSelected: model.selectedSubtitleTrack == track
                            ) {
                                model.selectSubtitleTrack(track)
                            }
                        }
                    }
                }
            }
            .scrollContentBackground(.hidden)
            .background(Color.flixyCanvas)
            .navigationTitle(Text("player.tracks"))
            .navigationBarTitleDisplayMode(.inline)
            .toolbar {
                ToolbarItem(placement: .confirmationAction) {
                    Button("action.close") { dismiss() }
                }
            }
        }
        .presentationDetents([.medium])
    }

    private func row(title: String, isSelected: Bool, action: @escaping () -> Void) -> some View {
        Button(action: action) {
            HStack {
                Text(title)
                    .foregroundStyle(Color.flixyTextPrimary)
                Spacer()
                if isSelected {
                    Image(systemName: "checkmark").foregroundStyle(accent)
                }
            }
            .contentShape(.rect)
        }
        .buttonStyle(.plain)
        .listRowBackground(Color.flixySurface)
        .accessibilityAddTraits(isSelected ? [.isButton, .isSelected] : .isButton)
    }
}