import Defaults
import SwiftUI

struct PlayerSettings: View {
    @Default(.instances) private var instances
    @Default(.playerInstanceID) private var playerInstanceID

    @Default(.playerSidebar) private var playerSidebar

    @Default(.showKeywords) private var showKeywords
    #if !os(tvOS)
        @Default(.showScrollToTopInComments) private var showScrollToTopInComments
    #endif
    @Default(.expandVideoDescription) private var expandVideoDescription
    @Default(.collapsedLinesDescription) private var collapsedLinesDescription
    @Default(.pauseOnHidingPlayer) private var pauseOnHidingPlayer
    @Default(.closeVideoOnEOF) private var closeVideoOnEOF
    #if os(iOS)
        @Default(.honorSystemOrientationLock) private var honorSystemOrientationLock
        @Default(.enterFullscreenInLandscape) private var enterFullscreenInLandscape
        @Default(.rotateToLandscapeOnEnterFullScreen) private var rotateToLandscapeOnEnterFullScreen
    #endif
    @Default(.closePiPOnNavigation) private var closePiPOnNavigation
    @Default(.closePiPOnOpeningPlayer) private var closePiPOnOpeningPlayer
    @Default(.closePlayerOnOpeningPiP) private var closePlayerOnOpeningPiP
    #if !os(macOS)
        @Default(.pauseOnEnteringBackground) private var pauseOnEnteringBackground
        @Default(.closePiPAndOpenPlayerOnEnteringForeground) private var closePiPAndOpenPlayerOnEnteringForeground
    #endif

    @Default(.enableReturnYouTubeDislike) private var enableReturnYouTubeDislike

    @Default(.showInspector) private var showInspector
    @Default(.showChapters) private var showChapters
    @Default(.showRelated) private var showRelated

    @ObservedObject private var accounts = AccountsModel.shared

    #if os(iOS)
        private var idiom: UIUserInterfaceIdiom {
            UIDevice.current.userInterfaceIdiom
        }
    #endif

    var body: some View {
        Group {
            #if os(macOS)
                sections

                Spacer()
            #else
                List {
                    sections
                }
            #endif
        }
        #if os(tvOS)
        .frame(maxWidth: 1000)
        #elseif os(iOS)
        .listStyle(.insetGrouped)
        #endif
        .navigationTitle("Player")
    }

    private var sections: some View {
        Group {
            Section(header: SettingsHeader(text: "Playback".localized())) {
                if !accounts.isEmpty {
                    sourcePicker
                }
                pauseOnHidingPlayerToggle
                closeVideoOnEOFToggle
                #if !os(macOS)
                    pauseOnEnteringBackgroundToogle
                #endif
            }

            #if !os(tvOS)
                Section(header: SettingsHeader(text: "Info".localized())) {
                    expandVideoDescriptionToggle
                    collapsedLineDescriptionStepper
                    showChaptersToggle
                    showRelatedToggle
                    #if os(macOS)
                        HStack {
                            Text("Inspector")
                            inspectorVisibilityPicker
                        }
                        .padding(.leading, 20)
                    #else
                        inspectorVisibilityPicker
                    #endif
                }
            #endif

            let interface = Section(header: SettingsHeader(text: "Interface".localized())) {
                #if os(iOS)
                    if idiom == .pad {
                        sidebarPicker
                    }
                #endif

                #if os(macOS)
                    sidebarPicker
                #endif

                if !accounts.isEmpty {
                    keywordsToggle

                    #if !os(tvOS)
                        showScrollToTopInCommentsToggle
                    #endif

                    returnYouTubeDislikeToggle
                }
            }

            #if os(tvOS)
                if !accounts.isEmpty {
                    interface
                }
            #elseif os(macOS)
                interface
            #elseif os(iOS)
                if idiom == .pad || !accounts.isEmpty {
                    interface
                }
            #endif

            #if os(iOS)
                Section(header: SettingsHeader(text: "Orientation".localized())) {
                    if idiom == .pad {
                        enterFullscreenInLandscapeToggle
                    }
                    honorSystemOrientationLockToggle
                    rotateToLandscapeOnEnterFullScreenPicker
                }
            #endif

            Section(header: SettingsHeader(text: "Picture in Picture".localized())) {
                closePiPOnNavigationToggle
                closePiPOnOpeningPlayerToggle
                closePlayerOnOpeningPiPToggle
                #if !os(macOS)
                    closePiPAndOpenPlayerOnEnteringForegroundToggle
                #endif
            }
        }
    }

    private var videoDetailsHeaderPadding: Double {
        #if os(macOS)
            5.0
        #else
            0.0
        #endif
    }

    private var sourcePicker: some View {
        Picker("Source", selection: $playerInstanceID) {
            Text("Instance of current account").tag(String?.none)

            ForEach(instances) { instance in
                Text(instance.description).tag(Optional(instance.id))
            }
        }
        .modifier(SettingsPickerModifier())
    }

    private var sidebarPicker: some View {
        Picker("Sidebar", selection: $playerSidebar) {
            #if os(macOS)
                Text("Show sidebar").tag(PlayerSidebarSetting.always)
            #endif

            #if os(iOS)
                Text("Show sidebar when space permits").tag(PlayerSidebarSetting.whenFits)
            #endif

            Text("Hide sidebar").tag(PlayerSidebarSetting.never)
        }
        .modifier(SettingsPickerModifier())
    }

    #if !os(tvOS)
        private var showScrollToTopInCommentsToggle: some View {
            Toggle("Show scroll to top button in comments", isOn: $showScrollToTopInComments)
        }
    #endif

    private var keywordsToggle: some View {
        Toggle("Show keywords", isOn: $showKeywords)
    }

    private var expandVideoDescriptionToggle: some View {
        Toggle("Open video description expanded", isOn: $expandVideoDescription)
    }

    private var collapsedLineDescriptionStepper: some View {
        Stepper(value: $collapsedLinesDescription, in: 0 ... 10) {
            Text("Description preview")
            if collapsedLinesDescription == 0 {
                Text("No preview")
            } else if collapsedLinesDescription == 1 {
                Text("\(collapsedLinesDescription) line")
            } else {
                Text("\(collapsedLinesDescription) lines")
            }
        }
    }

    private var returnYouTubeDislikeToggle: some View {
        Toggle("Enable Return YouTube Dislike", isOn: $enableReturnYouTubeDislike)
    }

    private var pauseOnHidingPlayerToggle: some View {
        Toggle("Pause when player is closed", isOn: $pauseOnHidingPlayer)
    }

    private var closeVideoOnEOFToggle: some View {
        Toggle("Close video and player on end", isOn: $closeVideoOnEOF)
    }

    #if !os(macOS)
        private var pauseOnEnteringBackgroundToogle: some View {
            Toggle("Pause when entering background", isOn: $pauseOnEnteringBackground)
        }
    #endif

    #if os(iOS)
        private var honorSystemOrientationLockToggle: some View {
            Toggle("Honor orientation lock", isOn: $honorSystemOrientationLock)
                .disabled(!enterFullscreenInLandscape)
        }

        private var enterFullscreenInLandscapeToggle: some View {
            Toggle("Enter fullscreen in landscape", isOn: $enterFullscreenInLandscape)
        }

        private var rotateToLandscapeOnEnterFullScreenPicker: some View {
            Picker("Rotate when entering fullscreen on landscape video", selection: $rotateToLandscapeOnEnterFullScreen) {
                Text("Landscape left").tag(FullScreenRotationSetting.landscapeRight)
                Text("Landscape right").tag(FullScreenRotationSetting.landscapeLeft)
                Text("No rotation").tag(FullScreenRotationSetting.disabled)
            }
            .modifier(SettingsPickerModifier())
        }
    #endif

    private var closePiPOnNavigationToggle: some View {
        Toggle("Close PiP when starting playing other video", isOn: $closePiPOnNavigation)
    }

    private var closePiPOnOpeningPlayerToggle: some View {
        Toggle("Close PiP when player is opened", isOn: $closePiPOnOpeningPlayer)
    }

    private var closePlayerOnOpeningPiPToggle: some View {
        Toggle("Close player when starting PiP", isOn: $closePlayerOnOpeningPiP)
    }

    #if !os(macOS)
        private var closePiPAndOpenPlayerOnEnteringForegroundToggle: some View {
            Toggle("Close PiP and open player when application enters foreground", isOn: $closePiPAndOpenPlayerOnEnteringForeground)
        }
    #endif

    #if !os(tvOS)
        private var inspectorVisibilityPicker: some View {
            Picker("Inspector", selection: $showInspector) {
                Text("Always").tag(ShowInspectorSetting.always)
                Text("Only for local files and URLs").tag(ShowInspectorSetting.onlyLocal)
            }
            #if os(macOS)
            .labelsHidden()
            #endif
        }

        private var showChaptersToggle: some View {
            Toggle("Chapters", isOn: $showChapters)
        }

        private var showRelatedToggle: some View {
            Toggle("Related", isOn: $showRelated)
        }
    #endif
}

struct PlayerSettings_Previews: PreviewProvider {
    static var previews: some View {
        VStack(alignment: .leading) {
            PlayerSettings()
        }
        .frame(minHeight: 800)
        .injectFixtureEnvironmentObjects()
    }
}