//
//  PlayerNowPlayingView.swift
//  Mobile Music Assistant
//
//  Created by Sven Hanold on 05.04.26.
//

import SwiftUI

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

    // Auto-tracks live updates via @Observable
    private var player: MAPlayer? {
        service.playerManager.players[playerId]
    }

    private var mediaItem: MAMediaItem? {
        player?.currentItem?.mediaItem
    }

    var body: some View {
        ZStack {
            // Blurred artwork background
            CachedAsyncImage(url: service.imageProxyURL(
                path: mediaItem?.imageUrl,
                provider: mediaItem?.imageProvider,
                size: 64
            )) { image in
                image
                    .resizable()
                    .aspectRatio(contentMode: .fill)
            } placeholder: {
                Color.clear
            }
            .ignoresSafeArea()
            .blur(radius: 80)
            .scaleEffect(1.4)
            .opacity(0.5)

            Rectangle()
                .fill(.ultraThinMaterial)
                .ignoresSafeArea()

            // Content
            VStack(spacing: 0) {
                // Drag indicator
                Capsule()
                    .fill(.secondary.opacity(0.4))
                    .frame(width: 36, height: 4)
                    .padding(.top, 12)
                    .padding(.bottom, 8)

                // Player name
                HStack {
                    Button { dismiss() } label: {
                        Image(systemName: "chevron.down")
                            .font(.title3)
                            .fontWeight(.semibold)
                            .foregroundStyle(.primary)
                            .frame(width: 44, height: 44)
                            .contentShape(Rectangle())
                    }

                    Spacer()

                    VStack(spacing: 2) {
                        Text("Now Playing")
                            .font(.caption)
                            .foregroundStyle(.secondary)
                        Text(player?.name ?? "")
                            .font(.subheadline)
                            .fontWeight(.semibold)
                            .lineLimit(1)
                    }

                    Spacer()

                    // Balance chevron button
                    Color.clear
                        .frame(width: 44, height: 44)
                }
                .padding(.horizontal, 20)
                .padding(.bottom, 8)

                // Album art
                GeometryReader { geo in
                    let size = min(geo.size.width - 64, geo.size.height)
                    CachedAsyncImage(url: service.imageProxyURL(
                        path: mediaItem?.imageUrl,
                        provider: mediaItem?.imageProvider,
                        size: 512
                    )) { image in
                        image
                            .resizable()
                            .aspectRatio(1, contentMode: .fill)
                    } placeholder: {
                        RoundedRectangle(cornerRadius: 16)
                            .fill(Color.gray.opacity(0.2))
                            .overlay {
                                Image(systemName: "music.note")
                                    .font(.system(size: 56))
                                    .foregroundStyle(.secondary)
                            }
                    }
                    .frame(width: size, height: size)
                    .clipShape(RoundedRectangle(cornerRadius: 16))
                    .shadow(color: .black.opacity(0.35), radius: 24, y: 12)
                    .frame(maxWidth: .infinity, maxHeight: .infinity)
                }
                .padding(.horizontal, 32)
                .padding(.vertical, 24)

                // Track info
                VStack(spacing: 6) {
                    Text(player?.currentItem?.name ?? "–")
                        .font(.title2)
                        .fontWeight(.bold)
                        .lineLimit(2)
                        .multilineTextAlignment(.center)

                    if let artists = mediaItem?.artists, !artists.isEmpty {
                        Text(artists.map { $0.name }.joined(separator: ", "))
                            .font(.body)
                            .foregroundStyle(.secondary)
                            .lineLimit(1)
                    } else if let album = mediaItem?.album {
                        Text(album.name)
                            .font(.body)
                            .foregroundStyle(.secondary)
                            .lineLimit(1)
                    }
                }
                .padding(.horizontal, 32)

                Spacer(minLength: 24)

                // Transport controls
                if let player {
                    HStack(spacing: 48) {
                        Button {
                            Task { try? await service.playerManager.previousTrack(playerId: playerId) }
                        } label: {
                            Image(systemName: "backward.fill")
                                .font(.system(size: 30))
                                .foregroundStyle(.primary)
                        }

                        Button {
                            Task {
                                if player.state == .playing {
                                    try? await service.playerManager.pause(playerId: playerId)
                                } else {
                                    try? await service.playerManager.play(playerId: playerId)
                                }
                            }
                        } label: {
                            Image(systemName: player.state == .playing ? "pause.circle.fill" : "play.circle.fill")
                                .font(.system(size: 72))
                                .foregroundStyle(.primary)
                                .symbolEffect(.bounce, value: player.state == .playing)
                        }

                        Button {
                            Task { try? await service.playerManager.nextTrack(playerId: playerId) }
                        } label: {
                            Image(systemName: "forward.fill")
                                .font(.system(size: 30))
                                .foregroundStyle(.primary)
                        }
                    }
                    .buttonStyle(.plain)
                }

                Spacer(minLength: 24)

                // Volume
                if let volume = player?.volume {
                    HStack(spacing: 10) {
                        Image(systemName: "speaker.fill")
                            .font(.caption)
                            .foregroundStyle(.secondary)
                            .frame(width: 20)

                        Slider(
                            value: Binding(
                                get: { Double(volume) },
                                set: { newValue in
                                    Task {
                                        try? await service.playerManager.setVolume(
                                            playerId: playerId,
                                            level: Int(newValue)
                                        )
                                    }
                                }
                            ),
                            in: 0...100,
                            step: 1
                        )

                        Image(systemName: "speaker.wave.3.fill")
                            .font(.caption)
                            .foregroundStyle(.secondary)
                            .frame(width: 20)
                    }
                    .padding(.horizontal, 32)
                }

                Spacer(minLength: 32)
            }
        }
        .presentationDetents([.large])
        .presentationDragIndicator(.hidden) // using custom indicator
    }
}