import SwiftUI

// MARK: - Shared bookmark actions
//
// The context menu and the podcast launch path are identical whether a bookmark
// is presented as a list row or as a library card. They live here so the two
// presentations can't drift apart — the menu is a @ViewBuilder rather than a
// ViewModifier because each host already owns the sheets it needs to present,
// and a modifier would have forced a second copy of that state.

/// Every action a bookmark offers, in the order they appear in the menu.
///
/// `@MainActor` because the callbacks are plain (non-Sendable) UI closures —
/// without it, Swift 6 treats handing them to this function as sending them
/// across isolation domains.
@MainActor
@ViewBuilder
func bookmarkMenuItems(
    bookmark: Bookmark,
    viewModel: BookmarksViewModel,
    openURL: OpenURLAction,
    onOpen: @escaping () -> Void,
    onEdit: (() -> Void)?,
    onPodcast: @escaping () -> Void
) -> some View {
    if let onEdit {
        Button { onEdit() } label: {
            Label("Edit", systemImage: "pencil")
        }
    }
    Button { onOpen() } label: {
        Label("Open", systemImage: "globe")
    }
    Button {
        if let url = URL(string: bookmark.url) { openURL(url) }
    } label: {
        Label("Open in Safari", systemImage: "safari")
    }
    Button { onPodcast() } label: {
        Label("Convert to Podcast", systemImage: "headphones")
    }
    Divider()
    Button {
        Task { await viewModel.archive(bookmark) }
    } label: {
        Label("Archive", systemImage: "archivebox")
    }
    Button(role: .destructive) {
        Task { await viewModel.delete(bookmark) }
    } label: {
        Label("Delete", systemImage: "trash")
    }
}

/// Resolve what a "convert to podcast" tap should do. Several cached episodes
/// means the user picks; one means play it; none means generate — and
/// generating only takes over the player when it isn't already busy.
///
/// The caller owns the sheet state because the presenting view has to.
@MainActor
func launchPodcast(
    for bookmark: Bookmark,
    viewModel: BookmarksViewModel,
    showFullPlayer: Binding<Bool>,
    episodePicker: Binding<Bookmark?>
) {
    let episodes = PodcastIndex.find(for: bookmark.url)
    if episodes.count >= 2 {
        episodePicker.wrappedValue = bookmark
    } else if let ep = episodes.first {
        viewModel.podcastPlayer.start(
            articleUrl: ep.articleUrl,
            articleTitle: ep.title ?? bookmark.displayTitle,
            claude: viewModel.claude
        )
        showFullPlayer.wrappedValue = true
    } else if viewModel.playOrGeneratePodcast(
        articleUrl: bookmark.url,
        title: bookmark.displayTitle
    ) {
        showFullPlayer.wrappedValue = true
    }
}

/// The two sheets any bookmark presentation needs once it offers podcasts.
struct PodcastSheets: ViewModifier {
    let viewModel: BookmarksViewModel
    @Binding var showFullPlayer: Bool
    @Binding var episodePicker: Bookmark?

    func body(content: Content) -> some View {
        content
            .sheet(isPresented: $showFullPlayer) {
                PodcastPlayerView(
                    vm: viewModel.podcastPlayer,
                    articleUrl: viewModel.podcastPlayer.currentArticleUrl,
                    articleTitle: viewModel.podcastPlayer.currentArticleTitle,
                    claude: viewModel.claude,
                    stopOnDismiss: false
                )
            }
            .sheet(item: $episodePicker) { b in
                EpisodePickerView(
                    bookmark: b,
                    vm: viewModel.podcastPlayer,
                    claude: viewModel.claude,
                    podcastGenerator: viewModel.podcastGenerator
                )
            }
    }
}

extension View {
    func podcastSheets(
        viewModel: BookmarksViewModel,
        showFullPlayer: Binding<Bool>,
        episodePicker: Binding<Bookmark?>
    ) -> some View {
        modifier(PodcastSheets(
            viewModel: viewModel,
            showFullPlayer: showFullPlayer,
            episodePicker: episodePicker
        ))
    }
}