import SwiftUI

private let defaultConfig = ServerConfig(
    host: "linkding-production-f7e0.up.railway.app",
    port: nil,
    path: "",
    token: "04c3388f543a6f4401ae41958b4a459a0125c4bf",
    useHttps: true
)

@main
struct MarksApp: App {
    @State private var serverConfig: ServerConfig = ServerConfig.load() ?? defaultConfig

    var body: some Scene {
        WindowGroup {
            MainContainer(config: serverConfig) {
                defaultConfig.save()
                serverConfig = defaultConfig
            }
            .task { serverConfig.save() }
        }
    }
}

private struct IdentifiableURL: Identifiable {
    let id = UUID()
    let url: URL
}

// Holds the API + ViewModel so they survive re-renders
struct MainContainer: View {
    let config: ServerConfig
    let onDisconnect: () -> Void

    @State private var viewModel: BookmarksViewModel
    @State private var deepLinkBrowser: IdentifiableURL?
    @State private var showDeepLinkPlayer = false
    @State private var selectedTab: AppTab = .bookmarks
    @State private var router = IntentRouter.shared
    @Environment(\.scenePhase) private var scenePhase

    init(config: ServerConfig, onDisconnect: @escaping () -> Void) {
        self.config = config
        self.onDisconnect = onDisconnect
        let api = LinkdingAPI(config: config)
        _viewModel = State(wrappedValue: BookmarksViewModel(api: api, cacheKey: config.host))
    }

    var body: some View {
        TabView(selection: $selectedTab) {
            Tab("Bookmarks", systemImage: "bookmark", value: AppTab.bookmarks) {
                BookmarksView(viewModel: viewModel, onDisconnect: onDisconnect)
            }
            Tab("Tags", systemImage: "tag", value: AppTab.tags) {
                TagsView(viewModel: viewModel)
            }
            Tab("Podcasts", systemImage: "headphones", value: AppTab.podcasts) {
                PodcastLibraryView(vm: viewModel.podcastPlayer, claude: viewModel.claude)
            }
            Tab(value: AppTab.search, role: .search) {
                SearchView(viewModel: viewModel)
            }
        }
        .onOpenURL { url in
            handleDeepLink(url)
        }
        .task { applyPendingIntent() }
        .onChange(of: router.openBookmarkURL) { _, _ in applyPendingIntent() }
        .onChange(of: router.searchRequest) { _, _ in applyPendingIntent() }
        .onChange(of: scenePhase) { old, new in
            // Refresh when returning to the foreground (cold launch is already
            // covered by BookmarksView's .task, so only react to a real re-entry).
            if new == .active && old != .active {
                Task { await viewModel.load() }
            }
        }
        .sheet(item: $deepLinkBrowser) { item in
            BrowserView(url: item.url, title: item.url.host ?? "", claude: viewModel.claude, podcastPlayer: viewModel.podcastPlayer)
        }
        .sheet(isPresented: $showDeepLinkPlayer) {
            PodcastPlayerView(
                vm: viewModel.podcastPlayer,
                articleUrl: viewModel.podcastPlayer.currentArticleUrl,
                articleTitle: viewModel.podcastPlayer.currentArticleTitle,
                claude: viewModel.claude,
                stopOnDismiss: false
            )
        }
    }

    /// Reacts to requests an App Intent placed on `IntentRouter` (opening a
    /// bookmark, or searching). Also runs once at launch so cold-starts via an
    /// intent are honored.
    private func applyPendingIntent() {
        if let urlString = router.openBookmarkURL {
            router.openBookmarkURL = nil
            if let url = URL(string: urlString) {
                deepLinkBrowser = IdentifiableURL(url: url)
            }
        }
        if let query = router.searchRequest {
            selectedTab = .search
            Task {
                viewModel.searchQuery = query
                await viewModel.search()
            }
            // SearchView consumes the text from the router on appear; leave it
            // set until then, then SearchView clears it.
        }
    }

    private func handleDeepLink(_ url: URL) {
        guard url.scheme == "marks",
              let comps = URLComponents(url: url, resolvingAgainstBaseURL: false),
              let articleUrl = comps.queryItems?.first(where: { $0.name == "url" })?.value
        else { return }

        switch url.host {
        case "bookmark":
            if let browserURL = URL(string: articleUrl) {
                deepLinkBrowser = IdentifiableURL(url: browserURL)
            }
        case "podcast":
            let podcasts = WidgetDataStore.loadPodcasts()
            let found = podcasts.first { $0.articleUrl == articleUrl }
            viewModel.podcastPlayer.start(
                articleUrl: articleUrl,
                articleTitle: found?.title ?? "",
                claude: viewModel.claude
            )
            showDeepLinkPlayer = true
        default:
            break
        }
    }
}