yattee/Shared/Player/Controls/ControlsOverlay.swift

import Defaults
import SwiftUI

struct ControlsOverlay: View {
    @ObservedObject private var player = PlayerModel.shared
    private var model = PlayerControlsModel.shared

    @State private var contentSize: CGSize = .zero

    @Default(.showMPVPlaybackStats) private var showMPVPlaybackStats
    @Default(.qualityProfiles) private var qualityProfiles

    #if os(tvOS)
        enum Field: Hashable {
            case qualityProfile
            case stream
            case increaseRate
            case decreaseRate
            case captions
            case audioTrack
        }

        @FocusState private var focusedField: Field?
        @State private var presentingQualityProfileMenu = false
        @State private var presentingStreamMenu = false
        @State private var presentingCaptionsMenu = false
        @State private var presentingAudioTrackMenu = false
    #endif

    var body: some View {
        ScrollView {
            VStack {
                Section(header: controlsHeader(rateAndCaptionsLabel.localized())) {
                    HStack(spacing: rateButtonsSpacing) {
                        decreaseRateButton
                        #if os(tvOS)
                        .focused($focusedField, equals: .decreaseRate)
                        #endif
                        rateButton
                        increaseRateButton
                        #if os(tvOS)
                        .focused($focusedField, equals: .increaseRate)
                        #endif
                    }

                    if player.activeBackend == .mpv {
                        captionsButton
                        #if os(tvOS)
                        .focused($focusedField, equals: .captions)
                        #endif

                        #if os(iOS)
                        .foregroundColor(.white)
                        #endif
                    }
                }

                Section(header: controlsHeader("Quality Profile".localized())) {
                    qualityProfileButton
                    #if os(tvOS)
                    .focused($focusedField, equals: .qualityProfile)
                    #endif
                }

                if !player.availableAudioTracks.isEmpty {
                    Section(header: controlsHeader("Audio Track".localized())) {
                        audioTrackButton
                        #if os(tvOS)
                        .focused($focusedField, equals: .audioTrack)
                        #endif
                    }
                }

                Section(header: controlsHeader("Stream & Player".localized())) {
                    qualityButton
                    #if os(tvOS)
                    .focused($focusedField, equals: .stream)
                    #endif

                    HStack(spacing: 8) {
                        backendButtons
                    }
                }

                if player.activeBackend == .mpv,
                   showMPVPlaybackStats
                {
                    Section(header: controlsHeader("Statistics".localized())) {
                        PlaybackStatsView()
                    }
                    #if os(tvOS)
                    .frame(width: 400)
                    #else
                    .frame(width: 240)
                    #endif
                }
            }
            .overlay(
                GeometryReader { geometry in
                    Color.clear.onAppear {
                        contentSize = geometry.size
                    }
                }
            )
            #if os(tvOS)
            .padding(.horizontal, 40)
            #endif
        }
        .frame(maxHeight: contentSize.height)
        #if os(tvOS)
            .onAppear {
                focusedField = .qualityProfile
            }
        #endif
    }

    private var rateAndCaptionsLabel: String {
        player.activeBackend == .mpv ? "Rate & Captions" : "Playback Rate"
    }

    private func controlsHeader(_ text: String) -> some View {
        Text(text)
            .font(.system(.caption))
            .foregroundColor(.secondary)
    }

    private var backendButtons: some View {
        ForEach(PlayerBackendType.allCases, id: \.self) { backend in
            backendButton(backend)
            #if !os(tvOS)
                .frame(height: 40)
            #endif
            #if os(iOS)
            .frame(maxWidth: 115)
            .modifier(ControlBackgroundModifier())
            .clipShape(RoundedRectangle(cornerRadius: 4))
            #endif
        }
    }

    private func backendButton(_ backend: PlayerBackendType) -> some View {
        Button {
            player.saveTime {
                player.changeActiveBackend(from: player.activeBackend, to: backend)
                model.resetTimer()
            }
        } label: {
            Text(backend.label)
                .foregroundColor(player.activeBackend == backend ? .accentColor : .secondary)
        }
        #if os(macOS)
        .buttonStyle(.bordered)
        #endif
    }

    @ViewBuilder private var rateButton: some View {
        #if os(macOS)
            ratePicker
                .labelsHidden()
                .frame(maxWidth: 100)
        #elseif os(iOS)
            Menu {
                ratePicker
            } label: {
                Text(player.rateLabel(player.currentRate))
                    .foregroundColor(.primary)
                    .frame(width: 123)
            }
            .transaction { t in t.animation = .none }
            .buttonStyle(.plain)
            .foregroundColor(.primary)
            .frame(width: 123, height: 40)
            .modifier(ControlBackgroundModifier())
            .mask(RoundedRectangle(cornerRadius: 3))
        #else
            Text(player.rateLabel(player.currentRate))
                .frame(minWidth: 120)
        #endif
    }

    var ratePicker: some View {
        Picker("Rate", selection: $player.currentRate) {
            ForEach(player.backend.suggestedPlaybackRates, id: \.self) { rate in
                Text(player.rateLabel(rate)).tag(rate)
            }
        }
        .transaction { t in t.animation = .none }
    }

    private var increaseRateButton: some View {
        let increasedRate = player.backend.suggestedPlaybackRates.first { $0 > player.currentRate }
        return Button {
            if let rate = increasedRate {
                player.currentRate = rate
            }
        } label: {
            Label("Increase rate", systemImage: "plus")
                .foregroundColor(.primary)
                .labelStyle(.iconOnly)
                .padding(8)
                .frame(width: 50, height: 40)
                .contentShape(Rectangle())
        }
        #if os(macOS)
        .buttonStyle(.bordered)
        #elseif os(iOS)
        .modifier(ControlBackgroundModifier())
        .clipShape(RoundedRectangle(cornerRadius: 4))
        #endif
        .disabled(increasedRate.isNil)
    }

    private var decreaseRateButton: some View {
        let decreasedRate = player.backend.suggestedPlaybackRates.last { $0 < player.currentRate }

        return Button {
            if let rate = decreasedRate {
                player.currentRate = rate
            }
        } label: {
            Label("Decrease rate", systemImage: "minus")
                .foregroundColor(.primary)
                .labelStyle(.iconOnly)
                .padding(8)
                .frame(width: 50, height: 40)
                .contentShape(Rectangle())
        }
        #if os(macOS)
        .buttonStyle(.bordered)
        #elseif os(iOS)
        .modifier(ControlBackgroundModifier())
        .clipShape(RoundedRectangle(cornerRadius: 4))
        #endif
        .disabled(decreasedRate.isNil)
    }

    private var rateButtonsSpacing: Double {
        #if os(tvOS)
            10
        #else
            8
        #endif
    }

    @ViewBuilder private var qualityProfileButton: some View {
        #if os(macOS)
            qualityProfilePicker
                .labelsHidden()
                .frame(maxWidth: 300)
        #elseif os(iOS)
            Menu {
                qualityProfilePicker
            } label: {
                Text(player.qualityProfileSelection?.description ?? "Automatic".localized())
                    .frame(maxWidth: 240)
            }
            .transaction { t in t.animation = .none }
            .buttonStyle(.plain)
            .foregroundColor(.primary)
            .frame(maxWidth: 240)
            .frame(height: 40)
            .modifier(ControlBackgroundModifier())
            .mask(RoundedRectangle(cornerRadius: 3))
        #else
            ControlsOverlayButton(
                focusedField: $focusedField,
                field: .qualityProfile,
                onSelect: { presentingQualityProfileMenu = true }
            ) {
                Text(player.qualityProfileSelection?.description ?? "Automatic".localized())
                    .lineLimit(1)
                    .frame(maxWidth: 320)
            }
            .alert("Quality Profile", isPresented: $presentingQualityProfileMenu) {
                Button("Automatic") { player.qualityProfileSelection = nil }

                ForEach(qualityProfiles) { qualityProfile in
                    Button(qualityProfile.description) {
                        player.qualityProfileSelection = qualityProfile
                    }
                }

                Button("Cancel", role: .cancel) {}
            }
        #endif
    }

    private var qualityProfilePicker: some View {
        Picker("Quality Profile", selection: $player.qualityProfileSelection) {
            Text("Automatic").tag(QualityProfile?.none)
            ForEach(qualityProfiles) { qualityProfile in
                Text(qualityProfile.description).tag(qualityProfile as QualityProfile?)
            }
        }
        .transaction { t in t.animation = .none }
    }

    @ViewBuilder private var qualityButton: some View {
        #if os(macOS)
            StreamControl()
                .labelsHidden()
                .frame(maxWidth: 300)
        #elseif os(iOS)
            Menu {
                StreamControl()
            } label: {
                Text(player.streamSelection?.resolutionAndFormat ?? "loading")
                    .frame(width: 140, height: 40)
                    .foregroundColor(.primary)
            }
            .transaction { t in t.animation = .none }
            .buttonStyle(.plain)
            .foregroundColor(.primary)
            .frame(width: 240, height: 40)
            .modifier(ControlBackgroundModifier())
            .mask(RoundedRectangle(cornerRadius: 3))
        #else
            StreamControl(focusedField: $focusedField, presentingStreamMenu: $presentingStreamMenu)
        #endif
    }

    @ViewBuilder private var captionsButton: some View {
        #if os(macOS)
            captionsPicker
                .labelsHidden()
                .frame(maxWidth: 300)
        #elseif os(iOS)
            Menu {
                captionsPicker
            } label: {
                HStack(spacing: 4) {
                    Image(systemName: "text.bubble")
                    if let captions = captionsBinding.wrappedValue,
                       let language = LanguageCodes(rawValue: captions.code)
                    {
                        Text("\(language.description.capitalized) (\(language.rawValue))")
                            .foregroundColor(.accentColor)
                    } else {
                        if captionsBinding.wrappedValue == nil {
                            Text("Not available")
                        } else {
                            Text("Disabled")
                                .foregroundColor(.accentColor)
                        }
                    }
                }
                .frame(width: 240)
                .frame(height: 40)
            }
            .transaction { t in t.animation = .none }
            .buttonStyle(.plain)
            .foregroundColor(.primary)
            .frame(width: 240)
            .modifier(ControlBackgroundModifier())
            .mask(RoundedRectangle(cornerRadius: 3))
        #else
            ControlsOverlayButton(
                focusedField: $focusedField,
                field: .captions,
                onSelect: { presentingCaptionsMenu = true }
            ) {
                HStack(spacing: 8) {
                    Image(systemName: "text.bubble")
                    if let captions = captionsBinding.wrappedValue,
                       let language = LanguageCodes(rawValue: captions.code)
                    {
                        Text("\(language.description.capitalized) (\(language.rawValue))")
                    } else {
                        if player.currentVideo?.captions.isEmpty == false {
                            Text("Disabled")
                        } else {
                            Text("Not available")
                        }
                    }
                }
                .frame(maxWidth: 320)
            }
            .alert("Captions", isPresented: $presentingCaptionsMenu) {
                Button("Disabled") { captionsBinding.wrappedValue = nil }

                ForEach(player.currentVideo?.captions ?? []) { caption in
                    Button(caption.description) { captionsBinding.wrappedValue = caption }
                }
                Button("Cancel", role: .cancel) {}
            }
        #endif
    }

    @ViewBuilder private var captionsPicker: some View {
        let captions = player.currentVideo?.captions ?? []
        Picker("Captions", selection: captionsBinding) {
            if captions.isEmpty {
                Text("Not available").tag(Captions?.none)
            } else {
                Text("Disabled").tag(Captions?.none)
                ForEach(captions) { caption in
                    Text(caption.description).tag(Optional(caption))
                }
            }
        }
        .disabled(captions.isEmpty)
    }

    private var captionsBinding: Binding<Captions?> {
        .init(
            get: { player.mpvBackend.captions },
            set: {
                player.mpvBackend.captions = $0
                Defaults[.captionsLanguageCode] = $0?.code
            }
        )
    }

    @ViewBuilder private var audioTrackButton: some View {
        #if os(macOS)
            audioTrackPicker
                .labelsHidden()
                .frame(maxWidth: 300)
        #elseif os(iOS)
            Menu {
                audioTrackPicker
            } label: {
                Text(player.selectedAudioTrack?.displayLanguage ?? "Original")
                    .frame(maxWidth: 240, alignment: .trailing)
            }
            .transaction { t in t.animation = .none }
            .buttonStyle(.plain)
            .foregroundColor(.accentColor)
            .frame(maxWidth: 240, alignment: .trailing)
            .frame(height: 40)
        #else
            ControlsOverlayButton(
                focusedField: $focusedField,
                field: .audioTrack,
                onSelect: { presentingAudioTrackMenu = true }
            ) {
                Text(player.selectedAudioTrack?.displayLanguage ?? "Original")
                    .frame(maxWidth: 320)
            }
            .alert("Audio Track", isPresented: $presentingAudioTrackMenu) {
                ForEach(Array(player.availableAudioTracks.enumerated()), id: \.offset) { index, track in
                    Button(track.description) { player.selectedAudioTrackIndex = index }
                }
                Button("Cancel", role: .cancel) {}
            }
        #endif
    }

    private var audioTrackPicker: some View {
        Picker("", selection: $player.selectedAudioTrackIndex) {
            ForEach(Array(player.availableAudioTracks.enumerated()), id: \.offset) { index, track in
                Text(track.description).tag(index)
            }
        }
        .transaction { t in t.animation = .none }
    }
}

struct ControlsOverlay_Previews: PreviewProvider {
    static var previews: some View {
        ControlsOverlay()
    }
}