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// Copyright 2025 Shota FUJI
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
// SPDX-License-Identifier: Apache-2.0

import PlacKit
import SwiftUI

struct PlaybackBar<TZone: Zone & Identifiable>: View {
	@Binding var zone_id: String?

	var zones: [String: TZone] = [:]

	private var zone: TZone? {
		zones.first(where: { _, zone in
			zone.id == zone_id
		})?.value
	}

	var onPlaybackActionHandler: ((PlaybackAction) async -> Void)?

	@State private var isPerformingAction = false

	var body: some View {
		HStack {
			HStack {
				Button {
					Task {
						await performAction(.Prev)
					}
				} label: {
					Label("Previous", systemImage: "backward.end.fill")
				}
				.font(.title3)
				.disabled(isPerformingAction)
				.disabled(zone?.isAllowedTo(.Prev) != true)

				if zone?.playback == PlacKit.PLAC_TRANSPORT_PLAYBACK_PLAYING {
					Button {
						Task {
							await performAction(.Pause)
						}
					} label: {
						Label("Pause", systemImage: "pause.fill")
					}
					.font(.title)
					.disabled(isPerformingAction)
					.disabled(zone?.isAllowedTo(.Pause) != true)
				} else {
					Button {
						Task {
							await performAction(.Play)
						}
					} label: {
						Label("Play", systemImage: "play.fill")
					}
					.font(.title)
					.disabled(isPerformingAction)
					.disabled(zone?.isAllowedTo(.Play) != true)
				}

				Button {
					Task {
						await performAction(.Next)
					}
				} label: {
					Label("Next", systemImage: "forward.end.fill")
				}
				.font(.title3)
				.disabled(isPerformingAction)
				.disabled(zone?.isAllowedTo(.Next) != true)
			}
			.labelStyle(.iconOnly)
			.buttonStyle(.borderless)

			VStack {
				let line1 = zone?.nowPlaying?.twoline.0 ?? " "
				let line2 = zone?.nowPlaying?.twoline.1 ?? " "

				Text(line1)
					.font(.headline)
					.lineLimit(1)

				Text(line2)
					.font(.subheadline)
					.lineLimit(1)
			}
			.frame(maxWidth: .infinity)

			if zones.count > 0 && zone_id != nil {
				Picker("Zone", selection: $zone_id) {
					ForEach(
						zones.values.sorted(by: {
							$0.id < $1.id
						})
					) { zone in
						Text(zone.name).tag(zone.id as String?)
					}
				}
				.scaledToFit()
			}
		}
		.padding([.horizontal], 10)
		.padding([.vertical], 6)
	}

	private func performAction(_ action: PlaybackAction) async {
		guard let handler = onPlaybackActionHandler else {
			return
		}

		isPerformingAction = true

		await handler(action)

		isPerformingAction = false
	}
}

extension PlaybackBar {
	func onPlaybackAction(_ handler: @escaping (PlaybackAction) async -> Void)
		-> PlaybackBar
	{
		var new = self
		new.onPlaybackActionHandler = handler
		return new
	}
}

#Preview("PlaybackBar") {
	@Previewable @State var zone_id: String? = "foo"

	let zones: [String: MockZone] = [
		"foo": MockZone(
			id: "foo",
			name: "Foo",
			playback: PlacKit.PLAC_TRANSPORT_PLAYBACK_PLAYING,
			nowPlaying: MockNowPlaying(
				line1: "My great song",
				line2: "Some untrusted artist",
				seek: (5, 3 * 60 + 30)
			),
			allowedActions: [.Play, .Pause, .Prev]
		),
		"bar": MockZone(
			id: "bar",
			name: "Bar",
			playback: PlacKit.PLAC_TRANSPORT_PLAYBACK_STOPPED,
			allowedActions: [.Play, .Pause, .Prev, .Next]
		),
	]

	PlaybackBar(zone_id: $zone_id, zones: zones)
		.onPlaybackAction { action in
			do {
				try await Task.sleep(for: .seconds(1))
				print(action)
			} catch {}
		}
}