import SwiftUI

struct BookmarkRow: View {
    let bookmark: Bookmark
    var readingProgress: Double = 0
    var onPodcast: (() -> Void)? = nil

    @State private var podcastTapCount = 0
    @State private var podcastCached = false

    /// Compact, static relative date ("6 min ago"). Using a formatter instead of
    /// `Text(_, style: .relative)` avoids the live per-second ticking timer.
    private static let relativeFormatter: RelativeDateTimeFormatter = {
        let f = RelativeDateTimeFormatter()
        f.unitsStyle = .abbreviated
        f.dateTimeStyle = .named
        return f
    }()

    var body: some View {
        VStack(alignment: .leading, spacing: 6) {
            HStack(alignment: .top, spacing: 11) {
                FaviconView(url: bookmark.faviconUrl)
                    .overlay(alignment: .topLeading) {
                        if bookmark.unread {
                            Circle()
                                .fill(.blue)
                                .frame(width: 8, height: 8)
                                .offset(x: -3, y: -3)
                        }
                    }
                    .padding(.top, 1)

                VStack(alignment: .leading, spacing: 4) {
                    Text(bookmark.displayTitle)
                        .font(.headline)
                        .foregroundStyle(.primary)
                        .lineLimit(2)
                        .fixedSize(horizontal: false, vertical: true)

                    HStack(spacing: 4) {
                        Text(bookmark.domain)
                        Text("·")
                        Text(Self.relativeFormatter.localizedString(for: bookmark.dateAdded, relativeTo: Date()))
                    }
                    .font(.footnote)
                    .foregroundStyle(.secondary)
                }

                Spacer()

                if let onPodcast {
                    Button {
                        podcastTapCount += 1
                        onPodcast()
                    } label: {
                        Image(systemName: podcastCached ? "headphones.circle.fill" : "headphones.circle")
                            .font(.title3)
                            .foregroundStyle(podcastCached ? .blue : Color(.systemGray3))
                    }
                    .buttonStyle(.plain)
                    .padding(.top, 1)
                    .sensoryFeedback(.impact(weight: .medium), trigger: podcastTapCount)
                }
            }

            if let excerpt = rowExcerpt {
                Text(excerpt.text)
                    .font(.subheadline)
                    .italic(excerpt.isAI)
                    .foregroundStyle(.secondary)
                    .lineLimit(2)
                    .padding(.leading, 44)
            }

            if !effectiveTags.isEmpty {
                ScrollView(.horizontal, showsIndicators: false) {
                    HStack(spacing: 6) {
                        ForEach(effectiveTags, id: \.self) { tag in
                            Text(tag)
                                .font(.caption.weight(.medium))
                                .foregroundStyle(.secondary)
                                .padding(.horizontal, 8)
                                .padding(.vertical, 3)
                                .background(Color(.systemGray6))
                                .clipShape(Capsule())
                        }
                    }
                }
                .padding(.leading, 44)
            }

        }
        .padding(.vertical, 14)
        .contentShape(Rectangle())
        .overlay(alignment: .bottom) {
            if readingProgress > 0.02 {
                GeometryReader { geo in
                    ZStack(alignment: .leading) {
                        Rectangle()
                            .fill(Color(.systemGray5))
                        Rectangle()
                            .fill(Color(.systemGreen))
                            .frame(width: geo.size.width * min(readingProgress, 1))
                    }
                }
                .frame(height: 2)
            }
        }
        .task(id: bookmark.url) {
            // Stat the podcast cache off the render path: once per appearance
            // (and when the URL changes), not on every `body` recomputation.
            let path = ClaudeService.cachedPodcastURL(for: bookmark.url).path
            podcastCached = await Task.detached { FileManager.default.fileExists(atPath: path) }.value
        }
    }

    /// Excerpt shown under the title: prefer the AI summary (italic), else the
    /// page's scraped description / user note. nil hides the line entirely.
    private var rowExcerpt: (text: String, isAI: Bool)? {
        if let s = bookmark.aiSummary?.trimmingCharacters(in: .whitespacesAndNewlines), !s.isEmpty {
            return (s, true)
        }
        if let e = bookmark.contentExcerpt {
            return (e, false)
        }
        return nil
    }

    private var effectiveTags: [String] {
        let base = bookmark.tagNames
        let ai = bookmark.aiTags ?? []
        let extra = ai.filter { !base.contains($0) }.prefix(3)
        return (base + extra).prefix(6).map { $0 }
    }
}

struct FaviconView: View {
    let url: String?

    var body: some View {
        Group {
            if let urlString = url, let faviconUrl = URL(string: urlString) {
                AsyncImage(url: faviconUrl) { phase in
                    switch phase {
                    case .success(let image):
                        image.resizable().scaledToFit()
                    default:
                        placeholder
                    }
                }
            } else {
                placeholder
            }
        }
        .frame(width: 32, height: 32)
        .clipShape(RoundedRectangle(cornerRadius: 7))
    }

    private var placeholder: some View {
        RoundedRectangle(cornerRadius: 6)
            .fill(Color(.systemGray5))
            .overlay {
                Image(systemName: "bookmark")
                    .font(.system(size: 11, weight: .medium))
                    .foregroundStyle(Color(.systemGray2))
            }
    }
}