//
//  MobileMALiveActivityLiveActivity.swift
//  MobileMALiveActivity
//

import ActivityKit
import MobileMAShared
import SwiftUI
import UIKit
import WidgetKit

private let activityTeal = Color(red: 0.0, green: 0.82, blue: 0.75)

// MARK: - Artwork View

private struct ArtworkView: View {
    let artworkData: Data?
    let size: CGFloat
    let cornerRadius: CGFloat
    let isPlaying: Bool

    var body: some View {
        Group {
            if let artworkData, let uiImage = UIImage(data: artworkData) {
                Image(uiImage: uiImage)
                    .resizable()
                    .aspectRatio(contentMode: .fill)
            } else {
                fallbackIcon
            }
        }
        .frame(width: size, height: size)
        .clipShape(RoundedRectangle(cornerRadius: cornerRadius))
    }

    private var fallbackIcon: some View {
        ZStack {
            activityTeal.opacity(0.2)
            Image(systemName: "speaker.wave.3.fill")
                .symbolEffect(
                    .variableColor.iterative.dimInactiveLayers.reversing,
                    isActive: isPlaying
                )
                .font(.system(size: size * 0.4, weight: .semibold))
                .foregroundStyle(activityTeal)
        }
    }
}

// MARK: - Widget

struct MobileMALiveActivityLiveActivity: Widget {
    var body: some WidgetConfiguration {
        ActivityConfiguration(for: MusicActivityAttributes.self) { context in
            LockScreenView(state: context.state)
                .activityBackgroundTint(activityTeal.opacity(0.2))
        } dynamicIsland: { context in
            DynamicIsland {
                DynamicIslandExpandedRegion(.leading) {
                    ArtworkView(
                        artworkData: context.state.artworkData,
                        size: 50,
                        cornerRadius: 10,
                        isPlaying: context.state.isPlaying
                    )
                    .padding(.leading, 4)
                }
                DynamicIslandExpandedRegion(.trailing) {
                    Image(systemName: context.state.isPlaying ? "pause.circle.fill" : "play.circle.fill")
                        .font(.title)
                        .foregroundStyle(activityTeal)
                        .padding(.trailing, 4)
                }
                DynamicIslandExpandedRegion(.center) {
                    VStack(alignment: .leading, spacing: 2) {
                        Text(context.state.trackTitle)
                            .font(.headline)
                            .lineLimit(1)
                        Text(context.state.artistName)
                            .font(.subheadline)
                            .lineLimit(1)
                            .foregroundStyle(.secondary)
                    }
                }
                DynamicIslandExpandedRegion(.bottom) {
                    HStack(spacing: 4) {
                        Image(systemName: "hifispeaker.fill")
                            .font(.caption2)
                            .foregroundStyle(activityTeal)
                        Text(context.state.playerName)
                            .font(.caption)
                            .foregroundStyle(.secondary)
                        Spacer()
                    }
                    .padding(.horizontal, 8)
                }
            } compactLeading: {
                ArtworkView(
                    artworkData: context.state.artworkData,
                    size: 28,
                    cornerRadius: 6,
                    isPlaying: context.state.isPlaying
                )
                .padding(.leading, 2)
            } compactTrailing: {
                Image(systemName: context.state.isPlaying ? "pause.circle.fill" : "play.circle.fill")
                    .font(.body)
                    .foregroundStyle(activityTeal)
                    .padding(.trailing, 2)
            } minimal: {
                ArtworkView(
                    artworkData: context.state.artworkData,
                    size: 24,
                    cornerRadius: 12,
                    isPlaying: context.state.isPlaying
                )
            }
            .keylineTint(activityTeal)
        }
    }
}

// MARK: - Lock Screen View

private struct LockScreenView: View {
    let state: MusicActivityAttributes.ContentState

    var body: some View {
        HStack(spacing: 12) {
            ArtworkView(artworkData: state.artworkData, size: 54, cornerRadius: 10, isPlaying: state.isPlaying)

            VStack(alignment: .leading, spacing: 2) {
                Text(state.trackTitle.isEmpty ? "Now Playing" : state.trackTitle)
                    .font(.headline)
                    .lineLimit(1)
                if !state.artistName.isEmpty {
                    Text(state.artistName)
                        .font(.subheadline)
                        .lineLimit(1)
                        .foregroundStyle(.secondary)
                }
                HStack(spacing: 4) {
                    Image(systemName: "hifispeaker.fill")
                        .font(.caption2)
                        .foregroundStyle(activityTeal)
                    Text(state.playerName)
                        .font(.caption)
                        .foregroundStyle(.secondary)
                }
            }

            Spacer()

            Image(systemName: state.isPlaying ? "pause.circle.fill" : "play.circle.fill")
                .font(.system(size: 32))
                .foregroundStyle(activityTeal)
        }
        .padding(16)
    }
}

// MARK: - Preview

#Preview("Notification", as: .content, using: MusicActivityAttributes()) {
    MobileMALiveActivityLiveActivity()
} contentStates: {
    MusicActivityAttributes.ContentState(
        trackTitle: "Bohemian Rhapsody", artistName: "Queen",
        artworkData: nil, isPlaying: true, playerName: "Living Room")
    MusicActivityAttributes.ContentState(
        trackTitle: "Bohemian Rhapsody", artistName: "Queen",
        artworkData: nil, isPlaying: false, playerName: "Living Room")
}