import SwiftUI

/// Compact track row for lists — adapts to current skin.
/// Shows 3 quick-add mix buttons on the right side.
struct TrackRow: View {
    let track: Track
    @EnvironmentObject private var theme: AppTheme
    @Environment(PlayerViewModel.self) private var playerVM
    @Environment(PlaylistViewModel.self) private var playlistVM
    @Environment(\.modelContext) private var modelContext

    private var isCurrentlyPlaying: Bool {
        playerVM.currentTrack?.id == track.id
    }

    private static let mixColors: [Color] = [
        Color(red: 0.95, green: 0.3, blue: 0.3),   // Red
        Color(red: 0.3, green: 0.75, blue: 0.95),   // Blue
        Color(red: 0.95, green: 0.75, blue: 0.2),   // Yellow/Gold
    ]

    var body: some View {
        HStack(spacing: 10) {
            // Album art
            ArtworkThumbnail(track: track)
                .frame(width: 44, height: 44)

            // Track info
            VStack(alignment: .leading, spacing: 2) {
                Text(track.title)
                    .font(.system(size: theme.dataFontSize, weight: isCurrentlyPlaying ? .semibold : .regular))
                    .foregroundStyle(isCurrentlyPlaying ? theme.playingHighlight : theme.primaryText)
                    .lineLimit(1)

                HStack(spacing: 6) {
                    if !track.artist.isEmpty {
                        Text(track.artist)
                            .font(.system(size: theme.smallFontSize))
                            .foregroundStyle(isCurrentlyPlaying ? theme.playingHighlight.opacity(0.7) : theme.secondaryText)
                            .lineLimit(1)
                    }

                    if let bpm = track.bpm {
                        Text("•")
                            .foregroundStyle(theme.tertiaryText)
                        Text("\(String(format: "%.0f", bpm)) BPM")
                            .font(.system(size: theme.smallFontSize, design: .monospaced))
                            .foregroundStyle(theme.tertiaryText)
                    }

                    if let key = track.musicalKey {
                        Text(key)
                            .font(.system(size: theme.smallFontSize, design: .monospaced))
                            .foregroundStyle(theme.tertiaryText)
                    }
                }
            }

            Spacer(minLength: 4)

            // 3 Mix buttons
            HStack(spacing: 4) {
                ForEach(0..<3, id: \.self) { slot in
                    Button {
                        _ = playlistVM.quickAddToMix(slot: slot, track: track, context: modelContext)
                    } label: {
                        Text("\(slot + 1)")
                            .font(.system(size: 11, weight: .bold, design: .rounded))
                            .frame(width: 26, height: 26)
                            .foregroundStyle(
                                playlistVM.mixTargets[slot] != nil
                                    ? Self.mixColors[slot]
                                    : theme.tertiaryText
                            )
                            .background(
                                playlistVM.mixTargets[slot] != nil
                                    ? Self.mixColors[slot].opacity(0.15)
                                    : theme.tertiaryText.opacity(0.08)
                            )
                            .clipShape(RoundedRectangle(cornerRadius: 6))
                    }
                    .buttonStyle(.plain)
                }
            }

            // Duration + format
            VStack(alignment: .trailing, spacing: 2) {
                Text(track.formattedDuration)
                    .font(.system(size: theme.smallFontSize, design: .monospaced))
                    .foregroundStyle(theme.secondaryText)

                Text(track.fileFormat)
                    .font(.system(size: 9, weight: .medium, design: .monospaced))
                    .foregroundStyle(theme.tertiaryText)
                    .padding(.horizontal, 4)
                    .padding(.vertical, 1)
                    .background(theme.tertiaryText.opacity(0.15))
                    .clipShape(RoundedRectangle(cornerRadius: 3))
            }

            if isCurrentlyPlaying && playerVM.isPlaying {
                Image(systemName: "speaker.wave.2.fill")
                    .font(.caption)
                    .foregroundStyle(theme.playingHighlight)
            }
        }
        .padding(.vertical, 4)
        .contextMenu {
            Button {
                playerVM.loadAndPlay(track)
                playerVM.showNowPlaying = true
            } label: {
                Label("Play Now", systemImage: "play.fill")
            }
            Button {
                playerVM.playNextInQueue(QueueEntry.from(track: track))
            } label: {
                Label("Play Next", systemImage: "text.insert")
            }
            Button {
                playerVM.addToQueue(QueueEntry.from(track: track))
            } label: {
                Label("Add to Queue", systemImage: "text.append")
            }
        }
    }
}

// MARK: - Artwork Thumbnail

struct ArtworkThumbnail: View {
    let track: Track
    @EnvironmentObject private var theme: AppTheme
    @State private var artwork: UIImage?

    var body: some View {
        Group {
            if let image = artwork {
                Image(uiImage: image)
                    .resizable()
                    .aspectRatio(contentMode: .fill)
            } else {
                ZStack {
                    RoundedRectangle(cornerRadius: theme.cornerRadius / 2)
                        .fill(theme.cardBackground)
                    Image(systemName: "music.note")
                        .font(.system(size: 16))
                        .foregroundStyle(theme.tertiaryText)
                }
            }
        }
        .clipShape(RoundedRectangle(cornerRadius: theme.cornerRadius / 2))
        .task {
            let url = track.fileURL
            artwork = await ArtworkService.shared.artwork(for: url)
        }
    }
}