//
//  PlayerQueueView.swift
//  Mobile Music Assistant
//
//  Created by Sven Hanold on 06.04.26.
//

import SwiftUI

struct PlayerQueueView: View {
    @Environment(MAService.self) private var service
    let playerId: String

    @State private var isLoading = false

    private var queueItems: [MAQueueItem] {
        service.playerManager.queues[playerId] ?? []
    }

    private var currentIndex: Int? {
        service.playerManager.playerQueues[playerId]?.currentIndex
    }

    private var currentItemId: String? {
        service.playerManager.playerQueues[playerId]?.currentItem?.queueItemId
    }

    var body: some View {
        Group {
            if isLoading && queueItems.isEmpty {
                VStack {
                    Spacer()
                    ProgressView()
                    Spacer()
                }
            } else if queueItems.isEmpty {
                VStack {
                    Spacer()
                    Text("Queue is empty")
                        .font(.subheadline)
                        .foregroundStyle(.secondary)
                    Spacer()
                }
            } else {
                ScrollViewReader { proxy in
                    ScrollView {
                        LazyVStack(spacing: 0) {
                            ForEach(Array(queueItems.enumerated()), id: \.element.id) { index, item in
                                let isCurrent = currentIndex == index
                                    || item.queueItemId == currentItemId

                                QueueItemRow(item: item, isCurrent: isCurrent)
                                    .id(item.queueItemId)
                                    .contentShape(Rectangle())
                                    .onTapGesture {
                                        Task {
                                            try? await service.playerManager.playIndex(
                                                playerId: playerId,
                                                index: index
                                            )
                                        }
                                    }

                                if index < queueItems.count - 1 {
                                    Divider()
                                        .padding(.leading, 76)
                                }
                            }
                        }
                        .padding(.bottom, 8)
                    }
                    .onAppear {
                        if let id = currentItemId {
                            proxy.scrollTo(id, anchor: .center)
                        }
                    }
                    .onChange(of: currentItemId) { _, newId in
                        if let newId {
                            withAnimation {
                                proxy.scrollTo(newId, anchor: .center)
                            }
                        }
                    }
                }
            }
        }
        .task {
            isLoading = true
            try? await service.playerManager.loadQueue(playerId: playerId)
            isLoading = false
        }
    }
}

// MARK: - Queue Item Row

private struct QueueItemRow: View {
    @Environment(MAService.self) private var service
    let item: MAQueueItem
    let isCurrent: Bool

    var body: some View {
        HStack(spacing: 12) {
            // Thumbnail
            CachedAsyncImage(url: service.imageProxyURL(
                path: item.mediaItem?.imageUrl,
                provider: item.mediaItem?.imageProvider,
                size: 96
            )) { image in
                image.resizable().scaledToFill()
            } placeholder: {
                RoundedRectangle(cornerRadius: 6)
                    .fill(Color.gray.opacity(0.2))
                    .overlay {
                        Image(systemName: "music.note")
                            .font(.caption)
                            .foregroundStyle(.secondary)
                    }
            }
            .frame(width: 48, height: 48)
            .clipShape(RoundedRectangle(cornerRadius: 6))

            // Track info
            VStack(alignment: .leading, spacing: 3) {
                HStack(spacing: 5) {
                    if isCurrent {
                        Image(systemName: "waveform")
                            .font(.caption2)
                            .foregroundStyle(.green)
                    }
                    Text(item.name)
                        .font(.body)
                        .fontWeight(isCurrent ? .semibold : .regular)
                        .foregroundStyle(.primary)
                        .lineLimit(1)
                }

                if let artists = item.mediaItem?.artists, !artists.isEmpty {
                    Text(artists.map { $0.name }.joined(separator: ", "))
                        .font(.caption)
                        .foregroundStyle(.secondary)
                        .lineLimit(1)
                }
            }

            Spacer()

            // Duration
            if let duration = item.duration ?? item.mediaItem?.duration {
                Text(formatDuration(duration))
                    .font(.caption)
                    .foregroundStyle(.secondary)
                    .monospacedDigit()
            }
        }
        .padding(.vertical, 8)
        .padding(.horizontal, 16)
        .background(isCurrent ? Color.primary.opacity(0.08) : Color.clear)
    }

    private func formatDuration(_ seconds: Int) -> String {
        let minutes = seconds / 60
        let remainingSeconds = seconds % 60
        return String(format: "%d:%02d", minutes, remainingSeconds)
    }
}