Flaro/Flixy/Views/Player/TrackPickerSheet.swift

import SwiftUI
import FlixyDesign
import FlixyPlayback

/// Auswahl einer Spur — Ton **oder** Untertitel, nicht beides.
///
/// Getrennt, weil es zwei verschiedene Fragen sind: die Tonspur wechselt man
/// einmal am Anfang, die Untertitel mitten im Film. Beide in einem Blatt
/// bedeutete jedes Mal Scrollen an der anderen Liste vorbei.
struct TrackPickerSheet: View {
    enum Kind: Identifiable {
        case audio
        case subtitles

        var id: Self { self }

        var title: LocalizedStringKey {
            switch self {
            case .audio: "player.audioTracks"
            case .subtitles: "player.subtitleTracks"
            }
        }
    }

    let model: PlayerModel
    let kind: Kind

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

    var body: some View {
        NavigationStack {
            List {
                switch kind {
                case .audio:
                    ForEach(model.audioTracks) { track in
                        row(
                            title: track.displayName,
                            isSelected: model.selectedAudioTrack == track
                        ) {
                            model.selectAudioTrack(track)
                            dismiss()
                        }
                    }

                case .subtitles:
                    // „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)
                        dismiss()
                    }

                    ForEach(model.subtitleTracks) { track in
                        row(
                            title: track.displayName,
                            isSelected: model.selectedSubtitleTrack == track
                        ) {
                            model.selectSubtitleTrack(track)
                            dismiss()
                        }
                    }
                }
            }
            .scrollContentBackground(.hidden)
            .background(Color.flixyCanvas)
            .navigationTitle(Text(kind.title))
            .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)
    }
}