import SwiftUI
import AppKit
import UniformTypeIdentifiers
import WebKit

struct LauncherRootView: View {
    enum LayoutMode {
        case grid
        case panel
    }

    @EnvironmentObject private var premiumStore: PremiumStore
    @State private var query = ""
    @State private var selectedApp: LauncherApp?
    @State private var showingPremiumScreen = false
    @State private var showingCreateAppSheet = false
    @State private var previouslyPremiumUnlocked = false
    @State private var startupPaywallTask: Task<Void, Never>?
    @State private var customApps: [LauncherApp] = []
    @State private var appOrder: [UUID] = []
    @State private var draggedAppID: UUID?
    @State private var lastDropDestinationAppID: UUID?
    @State private var layoutMode: LayoutMode = .grid
    @AppStorage("customLauncherAppsData") private var customAppsData = ""
    @AppStorage("launcherAppOrderData") private var appOrderData = ""
    @AppStorage("pinnedTileIDsData") private var pinnedTileIDsData = ""
    @AppStorage("statusBarAppIDsData") private var statusBarAppIDsData = ""
    @AppStorage("widgetAppIDsData") private var widgetAppIDsData = ""
    @AppStorage("hiddenLauncherAppIDsData") private var hiddenLauncherAppIDsData = ""

    private var apps: [LauncherApp] {
        let hiddenIDs = decodeUUIDSet(from: hiddenLauncherAppIDsData)
        let visibleApps = (LauncherApp.sampleApps + customApps).filter { !hiddenIDs.contains($0.id) }
        return visibleApps + [LauncherApp.createNewTile]
    }
    private var columns: [GridItem] {
        [GridItem(.adaptive(minimum: 120, maximum: 145), spacing: 22)]
    }

    private var filteredApps: [LauncherApp] {
        let q = query.trimmingCharacters(in: .whitespacesAndNewlines)
        guard !q.isEmpty else { return orderedApps }
        return orderedApps.filter { $0.name.localizedCaseInsensitiveContains(q) }
    }

    private var orderedApps: [LauncherApp] {
        guard !apps.isEmpty else { return [] }

        let defaultIndexByID = Dictionary(
            uniqueKeysWithValues: apps.enumerated().map { ($0.element.id, $0.offset) }
        )
        let rankByID = Dictionary(
            uniqueKeysWithValues: appOrder.enumerated().map { ($0.element, $0.offset) }
        )
        let pinnedIDs = decodeUUIDSet(from: pinnedTileIDsData)

        return apps.sorted { lhs, rhs in
            if lhs.isCreateNew != rhs.isCreateNew {
                return rhs.isCreateNew
            }

            let leftPinned = pinnedIDs.contains(lhs.id)
            let rightPinned = pinnedIDs.contains(rhs.id)
            if leftPinned != rightPinned {
                return leftPinned
            }

            let leftRank = rankByID[lhs.id] ?? Int.max
            let rightRank = rankByID[rhs.id] ?? Int.max

            if leftRank != rightRank {
                return leftRank < rightRank
            }

            return (defaultIndexByID[lhs.id] ?? Int.max) < (defaultIndexByID[rhs.id] ?? Int.max)
        }
    }

    private var hiddenApps: [LauncherApp] {
        let hiddenIDs = decodeUUIDSet(from: hiddenLauncherAppIDsData)
        guard !hiddenIDs.isEmpty else { return [] }
        let allApps = LauncherApp.sampleApps + customApps
        return allApps
            .filter { hiddenIDs.contains($0.id) }
            .sorted { $0.name.localizedCaseInsensitiveCompare($1.name) == .orderedAscending }
    }

    var body: some View {
        ZStack {
            VisualEffectBlur(material: .hudWindow, blendingMode: .behindWindow)
                .ignoresSafeArea()

            Color.black.opacity(0.22)
            .ignoresSafeArea()

            VStack(spacing: 16) {
                SearchHeader(
                    query: $query,
                    isPanelMode: layoutMode == .panel,
                    hiddenApps: hiddenApps,
                    onToggleLayout: {
                        layoutMode = layoutMode == .grid ? .panel : .grid
                    },
                    onOpenPremium: {
                        showingPremiumScreen = true
                    },
                    onOpenGoogle: {
                        if let url = URL(string: "https://www.google.com") {
                            InAppBrowserWindowManager.shared.open(url: url, title: "Google")
                        }
                    },
                    onRestoreApp: { appID in
                        restoreHiddenApp(id: appID)
                    },
                    onRestoreAll: {
                        restoreAllHiddenApps()
                    }
                )
                .padding(.top, 12)

                PromoBanner(
                    isPremiumUnlocked: premiumStore.isPremiumUnlocked,
                    onCloseTap: {
                        if !premiumStore.isPremiumUnlocked {
                            showingPremiumScreen = true
                        }
                    },
                    onUpgradeTap: { showingPremiumScreen = true },
                    onManageSubscriptionTap: { openManageSubscriptions() }
                )
                .padding(.bottom, 8)
                .zIndex(1)

                appsPage
            }
            .padding(.horizontal, 10)
            .padding(.bottom, 8)
        }
        .sheet(item: $selectedApp) { app in
            AppDetailView(app: app)
                .frame(minWidth: 360, minHeight: 220)
        }
        .sheet(isPresented: $showingPremiumScreen) {
            PremiumFeaturesView()
                .environmentObject(premiumStore)
                .frame(minWidth: 560, minHeight: 690)
        }
        .sheet(isPresented: $showingCreateAppSheet) {
            CreateAppSheetView { input in
                addCustomApp(name: input.name, url: input.url)
            }
            .frame(minWidth: 760, minHeight: 420)
        }
        .task {
            await premiumStore.refreshEntitlements()
        }
        .onChange(of: showingPremiumScreen) { isShowing in
            guard !isShowing else { return }
            Task {
                await premiumStore.refreshEntitlements()
            }
        }
        .onChange(of: premiumStore.isPremiumUnlocked) { unlocked in
            if previouslyPremiumUnlocked && !unlocked {
                showingPremiumScreen = true
            }
            previouslyPremiumUnlocked = unlocked
        }
        .onAppear {
            previouslyPremiumUnlocked = premiumStore.isPremiumUnlocked
            loadCustomAppsFromStorage()
            loadAppOrderFromStorage()
            normalizeAppOrderAndPersist()

            DesktopWidgetWindowManager.shared.restore(appProvider: { id in
                orderedApps.first { $0.id == id }
            })

            NotificationCenter.default.addObserver(
                forName: .openWidgetsPage,
                object: nil,
                queue: .main
            ) { notification in
                let id = notification.userInfo?["appID"] as? UUID
                WidgetsWindowManager.shared.open(
                    apps: orderedApps.filter { !$0.isCreateNew },
                    selectedAppID: id
                )
            }

            startupPaywallTask?.cancel()
            startupPaywallTask = Task {
                try? await Task.sleep(nanoseconds: 2_000_000_000)
                guard !Task.isCancelled else { return }
                await premiumStore.refreshEntitlements()
                guard !premiumStore.isPremiumUnlocked else { return }
                guard !showingPremiumScreen else { return }
                showingPremiumScreen = true
            }
        }
        .onDisappear {
            startupPaywallTask?.cancel()
            startupPaywallTask = nil
        }
    }

    @ViewBuilder
    private var appsPage: some View {
        if filteredApps.isEmpty {
            VStack(spacing: 10) {
                Image(systemName: "magnifyingglass")
                    .font(.system(size: 28, weight: .semibold))
                    .foregroundStyle(.white.opacity(0.75))
                Text("No apps found")
                    .font(.title3.weight(.semibold))
                    .foregroundStyle(.white.opacity(0.9))
                Text("Try a different search term.")
                    .font(.subheadline)
                    .foregroundStyle(.white.opacity(0.7))
            }
            .frame(maxWidth: .infinity, maxHeight: .infinity)
        } else {
            if layoutMode == .panel {
                IconPanelView(
                    apps: filteredApps,
                    onAppTap: { app in
                        handleAppTap(app)
                    },
                    draggedAppID: $draggedAppID,
                    lastDropDestinationAppID: $lastDropDestinationAppID,
                    onMove: moveApp,
                    onHideApp: hideApp
                )
            } else {
                ScrollView {
                    LazyVGrid(columns: columns, spacing: 20) {
                        ForEach(filteredApps) { app in
                            AppTileView(
                                app: app,
                                onTap: { handleAppTap(app) },
                                onHide: { hideApp(id: app.id) }
                            )
                            .onDrag {
                                draggedAppID = app.id
                                lastDropDestinationAppID = nil
                                return NSItemProvider(object: app.id.uuidString as NSString)
                            }
                            .onDrop(
                                of: [UTType.text],
                                delegate: TileReorderDropDelegate(
                                    destinationAppID: app.id,
                                    draggedAppID: $draggedAppID,
                                    lastDropDestinationAppID: $lastDropDestinationAppID,
                                    onMove: moveApp
                                )
                            )
                        }
                    }
                    .padding(.top, 10)
                    .padding(.horizontal, 14)
                    .padding(.bottom, 18)
                }
            }
        }
    }

    private func handleAppTap(_ app: LauncherApp) {
        if app.isCreateNew {
            showingCreateAppSheet = true
            return
        }

        if let webURL = app.webURL {
            InAppBrowserWindowManager.shared.open(url: webURL, title: app.name)
            return
        }

        selectedApp = app
    }

    private func addCustomApp(name: String, url: URL) {
        let newApp = LauncherApp(
            name: name,
            assetIconName: "",
            fallbackSymbolName: "globe",
            description: "Custom app shortcut.",
            isCreateNew: false,
            webURL: url
        )
        customApps.append(newApp)
        saveCustomAppsToStorage()
        normalizeAppOrderAndPersist()
    }

    private func loadCustomAppsFromStorage() {
        guard !customAppsData.isEmpty else {
            customApps = []
            return
        }

        guard let data = customAppsData.data(using: .utf8) else {
            customApps = []
            return
        }

        do {
            let persisted = try JSONDecoder().decode([PersistedCustomApp].self, from: data)
            customApps = persisted.compactMap { item in
                guard let parsedURL = URL(string: item.urlString) else { return nil }
                return LauncherApp(
                    id: item.id,
                    name: item.name,
                    assetIconName: "",
                    fallbackSymbolName: "globe",
                    description: "Custom app shortcut.",
                    isCreateNew: false,
                    webURL: parsedURL
                )
            }
        } catch {
            customApps = []
        }
    }

    private func saveCustomAppsToStorage() {
        let persisted = customApps.compactMap { app -> PersistedCustomApp? in
            guard !app.isCreateNew, let urlString = app.webURL?.absoluteString else { return nil }
            return PersistedCustomApp(id: app.id, name: app.name, urlString: urlString)
        }

        do {
            let encoded = try JSONEncoder().encode(persisted)
            customAppsData = String(decoding: encoded, as: UTF8.self)
        } catch {
            // Keep UI responsive even if persistence fails.
        }
    }

    private func moveApp(from sourceID: UUID, to destinationID: UUID) {
        guard sourceID != destinationID else { return }
        guard let sourceIndex = appOrder.firstIndex(of: sourceID),
              let destinationIndex = appOrder.firstIndex(of: destinationID) else {
            return
        }

        var updated = appOrder
        let movedID = updated.remove(at: sourceIndex)
        let insertionIndex = destinationIndex > sourceIndex ? destinationIndex - 1 : destinationIndex
        updated.insert(movedID, at: insertionIndex)
        appOrder = updated
        saveAppOrderToStorage()
    }

    private func hideApp(id: UUID) {
        var hiddenIDs = decodeUUIDSet(from: hiddenLauncherAppIDsData)
        guard hiddenIDs.insert(id).inserted else { return }
        hiddenLauncherAppIDsData = encodeUUIDSetGlobal(hiddenIDs)
        removeIDFromLinkedCollections(id)
    }

    private func restoreHiddenApp(id: UUID) {
        var hiddenIDs = decodeUUIDSet(from: hiddenLauncherAppIDsData)
        guard hiddenIDs.remove(id) != nil else { return }
        hiddenLauncherAppIDsData = encodeUUIDSetGlobal(hiddenIDs)
    }

    private func restoreAllHiddenApps() {
        hiddenLauncherAppIDsData = ""
    }

    private func removeIDFromLinkedCollections(_ id: UUID) {
        var pinnedIDs = decodeUUIDSet(from: pinnedTileIDsData)
        pinnedIDs.remove(id)
        pinnedTileIDsData = encodeUUIDSetGlobal(pinnedIDs)

        var statusBarIDs = decodeUUIDSet(from: statusBarAppIDsData)
        if statusBarIDs.remove(id) != nil {
            statusBarAppIDsData = encodeUUIDSetGlobal(statusBarIDs)
            LauncherApp.notifyStatusBarShortcutIdentifiersChanged()
        }

        var widgetIDs = decodeUUIDSet(from: widgetAppIDsData)
        widgetIDs.remove(id)
        widgetAppIDsData = encodeUUIDSetGlobal(widgetIDs)
    }

    private func loadAppOrderFromStorage() {
        guard !appOrderData.isEmpty else {
            appOrder = []
            return
        }

        guard let data = appOrderData.data(using: .utf8) else {
            appOrder = []
            return
        }

        do {
            let decoded = try JSONDecoder().decode([String].self, from: data)
            appOrder = decoded.compactMap { UUID(uuidString: $0) }
        } catch {
            appOrder = []
        }
    }

    private func normalizeAppOrderAndPersist() {
        let currentIDs = apps.map(\.id)
        var seen = Set<UUID>()
        var normalized: [UUID] = []

        for id in appOrder where currentIDs.contains(id) {
            if seen.insert(id).inserted {
                normalized.append(id)
            }
        }

        for id in currentIDs where seen.insert(id).inserted {
            normalized.append(id)
        }

        appOrder = normalized
        saveAppOrderToStorage()
    }

    private func saveAppOrderToStorage() {
        do {
            let payload = appOrder.map(\.uuidString)
            let encoded = try JSONEncoder().encode(payload)
            appOrderData = String(decoding: encoded, as: UTF8.self)
        } catch {
            // Ignore persistence failure and keep local order.
        }
    }

    private func decodeUUIDSet(from dataString: String) -> Set<UUID> {
        guard !dataString.isEmpty, let data = dataString.data(using: .utf8) else { return [] }
        do {
            let strings = try JSONDecoder().decode([String].self, from: data)
            return Set(strings.compactMap(UUID.init(uuidString:)))
        } catch {
            return []
        }
    }

    private func openManageSubscriptions() {
        let appStoreURL = URL(string: "macappstore://apps.apple.com/account/subscriptions")!
        if NSWorkspace.shared.open(appStoreURL) {
            return
        }
        let webURL = URL(string: "https://apps.apple.com/account/subscriptions")!
        _ = NSWorkspace.shared.open(webURL)
    }
}

private struct TileReorderDropDelegate: DropDelegate {
    let destinationAppID: UUID
    @Binding var draggedAppID: UUID?
    @Binding var lastDropDestinationAppID: UUID?
    let onMove: (UUID, UUID) -> Void

    func dropEntered(info: DropInfo) {
        guard let draggedAppID else { return }
        guard draggedAppID != destinationAppID else { return }
        // SwiftUI may call `dropEntered` multiple times while hovering the same tile.
        // Avoid reordering repeatedly to keep drag-to-reorder stable.
        guard lastDropDestinationAppID != destinationAppID else { return }
        lastDropDestinationAppID = destinationAppID
        onMove(draggedAppID, destinationAppID)
    }

    func performDrop(info: DropInfo) -> Bool {
        draggedAppID = nil
        lastDropDestinationAppID = nil
        return true
    }
}

private struct SearchHeader: View {
    @Binding var query: String
    let isPanelMode: Bool
    let hiddenApps: [LauncherApp]
    let onToggleLayout: () -> Void
    let onOpenPremium: () -> Void
    let onOpenGoogle: () -> Void
    let onRestoreApp: (UUID) -> Void
    let onRestoreAll: () -> Void

    var body: some View {
        HStack {
            HStack(spacing: 10) {
                Image(systemName: "magnifyingglass")
                    .foregroundStyle(.white.opacity(0.82))
                TextField("Search", text: $query)
                    .textFieldStyle(.plain)
                    .foregroundStyle(.white.opacity(0.94))
            }
            .padding(.horizontal, 12)
            .padding(.vertical, 8)
            .background(
                RoundedRectangle(cornerRadius: 15, style: .continuous)
                    .fill(Color.black.opacity(0.28))
            )
            .overlay(
                RoundedRectangle(cornerRadius: 15, style: .continuous)
                    .stroke(Color.white.opacity(0.08), lineWidth: 1)
            )

            Spacer(minLength: 8)

            HStack(spacing: 12) {
                Button(action: onToggleLayout) {
                    Image(systemName: isPanelMode ? "square.grid.2x2" : "list.bullet")
                }
                .buttonStyle(.plain)

                Menu {
                    Button("Clear Search") {
                        query = ""
                    }
                    Button("Open Premium") {
                        onOpenPremium()
                    }
                    Button("Open Google") {
                        onOpenGoogle()
                    }
                    if !hiddenApps.isEmpty {
                        Divider()
                        Menu("Manage Hidden Apps") {
                            ForEach(hiddenApps) { app in
                                Button("Add Back \(app.name)") {
                                    onRestoreApp(app.id)
                                }
                            }
                            Divider()
                            Button("Restore All Hidden Apps") {
                                onRestoreAll()
                            }
                        }
                    }
                } label: {
                    Image(systemName: "ellipsis")
                }
                .menuStyle(.borderlessButton)
            }
            .font(.system(size: 15, weight: .semibold))
            .foregroundStyle(.white.opacity(0.82))
            .padding(.trailing, 4)
        }
    }
}

private struct IconPanelView: View {
    let apps: [LauncherApp]
    let onAppTap: (LauncherApp) -> Void
    @Binding var draggedAppID: UUID?
    @Binding var lastDropDestinationAppID: UUID?
    let onMove: (UUID, UUID) -> Void
    let onHideApp: (UUID) -> Void

    var body: some View {
        ScrollView {
            VStack(alignment: .leading, spacing: 12) {
                ForEach(apps) { app in
                    PanelAppRowView(
                        app: app,
                        onAppTap: onAppTap,
                        draggedAppID: $draggedAppID,
                        lastDropDestinationAppID: $lastDropDestinationAppID,
                        onMove: onMove,
                        onHideApp: onHideApp
                    )
                }
            }
            .padding(.horizontal, 10)
            .padding(.bottom, 18)
        }
    }
}

private struct PanelAppRowView: View {
    let app: LauncherApp
    let onAppTap: (LauncherApp) -> Void
    @Binding var draggedAppID: UUID?
    @Binding var lastDropDestinationAppID: UUID?
    let onMove: (UUID, UUID) -> Void
    let onHideApp: (UUID) -> Void

    @ObservedObject private var premiumStore = PremiumStore.shared
    @AppStorage("pinnedTileIDsData") private var pinnedTileIDsData = ""
    @AppStorage("statusBarAppIDsData") private var statusBarAppIDsData = ""
    @AppStorage("widgetAppIDsData") private var widgetAppIDsData = ""

    @State private var isHovering = false

    private var pinnedIDs: Set<UUID> {
        decodeUUIDSetGlobal(from: pinnedTileIDsData)
    }

    private var isPinned: Bool {
        pinnedIDs.contains(app.id)
    }

    private var statusBarIDs: Set<UUID> {
        decodeUUIDSetGlobal(from: statusBarAppIDsData)
    }

    private var isInStatusBar: Bool {
        statusBarIDs.contains(app.id)
    }

    var body: some View {
        ZStack(alignment: .topTrailing) {
            Button(action: { onAppTap(app) }) {
                HStack(spacing: 14) {
                    AppIconGlyph(app: app)
                    Text(app.name)
                        .font(.system(size: 18, weight: .medium))
                        .foregroundStyle(.white.opacity(0.94))
                        .lineLimit(1)
                        .truncationMode(.tail)
                    Spacer(minLength: 0)
                }
                .frame(maxWidth: .infinity, alignment: .leading)
                .contentShape(Rectangle())
            }
            .buttonStyle(.plain)

            if isPinned && !app.isCreateNew {
                Image(systemName: "pin.fill")
                    .font(.system(size: 12, weight: .semibold))
                    .foregroundStyle(.white.opacity(0.92))
                    .frame(width: 26, height: 26)
                    .background(
                        Circle()
                            .fill(Color.black.opacity(isHovering ? 0.35 : 0.2))
                    )
                    .overlay(
                        Circle()
                            .stroke(Color.white.opacity(isHovering ? 0.18 : 0.12), lineWidth: 1)
                    )
                    .shadow(color: .black.opacity(0.22), radius: 10, x: 0, y: 6)
                    .padding(8)
                    .frame(maxWidth: .infinity, maxHeight: .infinity, alignment: .topLeading)
                    .allowsHitTesting(false)
            }

            if !app.isCreateNew {
                Menu {
                    Button(isPinned ? "Unpin" : "Pin") { togglePin() }
                    Divider()
                    if isInStatusBar {
                        Button("Remove from StatusBar") { removeFromStatusBar() }
                    } else {
                        Button("Add to StatusBar") { addToStatusBar() }
                            .disabled(!premiumStore.isPremiumUnlocked)
                    }
                    Button("Add to desktop") { addToDesktop() }
                        .disabled(!premiumStore.isPremiumUnlocked)
                    Button("Add Widget") { addWidget() }
                    Divider()
                    Button("Remove from View") { onHideApp(app.id) }
                } label: {
                    Image(systemName: "ellipsis")
                        .font(.system(size: 13, weight: .semibold))
                        .rotationEffect(.degrees(90))
                        .foregroundStyle(.white.opacity(isHovering ? 0.92 : 0.75))
                        .frame(width: 26, height: 26)
                        .background(
                            Circle()
                                .fill(Color.black.opacity(isHovering ? 0.35 : 0.2))
                        )
                        .overlay(
                            Circle()
                                .stroke(Color.white.opacity(isHovering ? 0.18 : 0.12), lineWidth: 1)
                        )
                        .shadow(color: .black.opacity(0.25), radius: 10, x: 0, y: 6)
                }
                .menuStyle(.borderlessButton)
                .modifier(HideMenuIndicatorIfAvailable())
                .padding(8)
                .opacity(isHovering ? 1 : 0.0)
                .animation(.easeOut(duration: 0.12), value: isHovering)
            }
        }
        .onHover { hovering in
            isHovering = hovering
        }
        .contextMenu {
            if !app.isCreateNew {
                Button(isPinned ? "Unpin" : "Pin") { togglePin() }
                Divider()
                if isInStatusBar {
                    Button("Remove from StatusBar") { removeFromStatusBar() }
                } else {
                    Button("Add to StatusBar") { addToStatusBar() }
                        .disabled(!premiumStore.isPremiumUnlocked)
                }
                Button("Add to desktop") { addToDesktop() }
                    .disabled(!premiumStore.isPremiumUnlocked)
                Button("Add Widget") { addWidget() }
                Divider()
                Button("Remove from View") { onHideApp(app.id) }
            }
        }
        .padding(.vertical, 3)
        .onDrag {
            draggedAppID = app.id
            lastDropDestinationAppID = nil
            return NSItemProvider(object: app.id.uuidString as NSString)
        }
        .onDrop(
            of: [UTType.text],
            delegate: TileReorderDropDelegate(
                destinationAppID: app.id,
                draggedAppID: $draggedAppID,
                lastDropDestinationAppID: $lastDropDestinationAppID,
                onMove: onMove
            )
        )
    }

    private func togglePin() {
        var updated = pinnedIDs
        if updated.contains(app.id) {
            updated.remove(app.id)
        } else {
            updated.insert(app.id)
        }
        pinnedTileIDsData = encodeUUIDSetGlobal(updated)
    }

    private func addToStatusBar() {
        var updated = decodeUUIDSetGlobal(from: statusBarAppIDsData)
        guard updated.insert(app.id).inserted else {
            showAlert(title: "Already added", message: "“\(app.name)” is already in the menu bar.")
            return
        }
        statusBarAppIDsData = encodeUUIDSetGlobal(updated)
        LauncherApp.notifyStatusBarShortcutIdentifiersChanged()
        showAlert(
            title: "Added to Status Bar",
            message: "“\(app.name)” now has its own icon in the menu bar. Click it to open, or right‑click to remove."
        )
    }

    private func removeFromStatusBar() {
        var updated = decodeUUIDSetGlobal(from: statusBarAppIDsData)
        guard updated.remove(app.id) != nil else { return }
        statusBarAppIDsData = encodeUUIDSetGlobal(updated)
        LauncherApp.notifyStatusBarShortcutIdentifiersChanged()
    }

    private func addWidget() {
        var updated = decodeUUIDSetGlobal(from: widgetAppIDsData)
        updated.insert(app.id)
        widgetAppIDsData = encodeUUIDSetGlobal(updated)
        NotificationCenter.default.post(
            name: .openWidgetsPage,
            object: nil,
            userInfo: ["appID": app.id]
        )
    }

    private func addToDesktop() {
        guard let webURL = app.webURL else {
            showAlert(title: "Unavailable", message: "Desktop shortcuts need a web address.")
            return
        }
        DesktopWeblocShortcutPresenter.beginSavePanel(forAppNamed: app.name, webURL: webURL)
    }

    private func showAlert(title: String, message: String) {
        let alert = NSAlert()
        alert.messageText = title
        alert.informativeText = message
        alert.addButton(withTitle: "OK")
        alert.alertStyle = .informational
        alert.runModal()
    }
}

private struct AppIconGlyph: View {
    let app: LauncherApp

    var body: some View {
        ZStack {
            RoundedRectangle(cornerRadius: 12, style: .continuous)
                .fill(Color.white.opacity(0.08))
                .frame(width: 48, height: 48)

            if let webURL = app.webURL {
                WebSiteFaviconView(
                    webURL: webURL,
                    size: 32,
                    assetIconName: app.assetIconName,
                    fallbackSymbolName: app.fallbackSymbolName,
                    iconPaddingFactor: 0.08
                )
            } else if let icon = NSImage(named: app.assetIconName) {
                Image(nsImage: icon)
                    .resizable()
                    .scaledToFit()
                    .frame(width: 32, height: 32)
            } else {
                Image(systemName: app.fallbackSymbolName)
                    .font(.system(size: 20, weight: .semibold))
                    .foregroundStyle(.white)
            }
        }
    }
}

// MARK: - Pinned app persistence helpers (panel mode)
private func decodeUUIDSetGlobal(from dataString: String) -> Set<UUID> {
    guard !dataString.isEmpty, let data = dataString.data(using: .utf8) else { return [] }
    do {
        let strings = try JSONDecoder().decode([String].self, from: data)
        return Set(strings.compactMap(UUID.init(uuidString:)))
    } catch {
        return []
    }
}

private func encodeUUIDSetGlobal(_ set: Set<UUID>) -> String {
    do {
        let strings = set.map(\.uuidString).sorted()
        let data = try JSONEncoder().encode(strings)
        return String(decoding: data, as: UTF8.self)
    } catch {
        return ""
    }
}

private struct PromoBanner: View {
    let isPremiumUnlocked: Bool
    let onCloseTap: () -> Void
    let onUpgradeTap: () -> Void
    let onManageSubscriptionTap: () -> Void

    var body: some View {
        HStack(spacing: 10) {
            Button(action: onCloseTap) {
                Image(systemName: "xmark")
                    .foregroundStyle(.blue.opacity(0.95))
                    .font(.system(size: 14, weight: .semibold))
            }
            .buttonStyle(.plain)

            Text(isPremiumUnlocked ? "Premium is active. Manage your subscription any time." : "Update to Premium to unlock all features and remove ads")
                .font(.system(size: 13, weight: .medium))
                .foregroundStyle(.blue.opacity(0.95))
                .lineLimit(1)

            Spacer()

            Button(action: isPremiumUnlocked ? onManageSubscriptionTap : onUpgradeTap) {
                Text(isPremiumUnlocked ? "Manage Subscription" : "Upgrade")
                    .font(.system(size: 13, weight: .semibold))
                    .foregroundStyle(.white)
                    .padding(.horizontal, 12)
                    .padding(.vertical, 6)
                    .background(
                        Capsule(style: .continuous)
                            .fill(Color.blue.opacity(0.92))
                    )
            }
            .buttonStyle(.plain)
        }
        .padding(.horizontal, 11)
        .padding(.vertical, 8)
        .background(
            RoundedRectangle(cornerRadius: 12, style: .continuous)
                .fill(Color.white.opacity(0.03))
        )
        .overlay(
            RoundedRectangle(cornerRadius: 12, style: .continuous)
                .stroke(Color.white.opacity(0.05), lineWidth: 1)
        )
    }
}

private struct ManageSubscriptionSheet: View {
    @Environment(\.dismiss) private var dismiss
    let activePremiumProductID: PremiumProductID?
    let onUpgradeTap: () -> Void
    private let url = URL(string: "https://apps.apple.com/account/subscriptions")!

    var body: some View {
        VStack(spacing: 0) {
            HStack {
                Text("Manage Subscription")
                    .font(.system(size: 15, weight: .semibold))
                    .foregroundStyle(.white.opacity(0.92))
                Spacer()
                Button("Done") { dismiss() }
                    .buttonStyle(.borderedProminent)
                    .controlSize(.small)
            }
            .padding(12)
            .background(Color.black.opacity(0.25))

            if activePremiumProductID == .yearly {
                HStack(spacing: 10) {
                    Text("You are on the yearly plan. Upgrade to Lifetime for permanent access.")
                        .font(.system(size: 12.5, weight: .medium))
                        .foregroundStyle(.white.opacity(0.9))
                    Spacer()
                    Button("Upgrade Package") {
                        onUpgradeTap()
                    }
                    .buttonStyle(.borderedProminent)
                    .controlSize(.small)
                }
                .padding(.horizontal, 12)
                .padding(.vertical, 10)
                .background(Color.blue.opacity(0.18))
            }

            SubscriptionWebView(url: url)
        }
        .background(Color.black.opacity(0.3))
    }
}

private struct SubscriptionWebView: NSViewRepresentable {
    let url: URL

    func makeNSView(context: Context) -> WKWebView {
        let webView = WKWebView()
        webView.allowsBackForwardNavigationGestures = true
        webView.load(URLRequest(url: url))
        return webView
    }

    func updateNSView(_ webView: WKWebView, context: Context) {}
}

private struct HideMenuIndicatorIfAvailable: ViewModifier {
    func body(content: Content) -> some View {
        if #available(macOS 13.0, *) {
            content.menuIndicator(.hidden)
        } else {
            content
        }
    }
}

#Preview {
    LauncherRootView()
        .environmentObject(PremiumStore.shared)
}