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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 OSLog
import RoonKit
import SwiftUI

struct Browser: View {
	private let logger = Logger()

	private let model: BrowsingDataModel
	private let item: BrowseService.Item?

	private var page: BrowsePage? {
		if let item = item {
			model.pages[item]
		} else {
			model.rootPage
		}
	}

	var body: some View {
		HStack {
			switch page {
			case .none, .some(.loading):
				ProgressView()
					.frame(maxWidth: .infinity, maxHeight: .infinity)
					.background(.background)
			case .some(.failed(_)):
				// TODO: Tidy
				ContentUnavailableView {
					Label("Load error", systemImage: "exclamationmark.triangle")
				} description: {
					Text("An error occurred when loading the page.")
				} actions: {
					Button("Retry") {
						model.reload()
					}
				}
			case .some(.loaded(let list, let items)):
				List(items, id: \.itemKey) { item in
					switch item.hint {
					case .list, .actionList:
						NavigationLink(value: item) {
							Row(item)
						}
					case .action:
						Button {
							model.loadPage(item: item)
						} label: {
							Row(item)
								.frame(maxWidth: .infinity, alignment: .leading)

							if model.pages[item]?.isLoading() ?? false {
								ProgressView()
									// Row height in macOS is way shorter than other platforms.
									#if os(macOS)
										.controlSize(.small)
									#endif
							}
						}
						.buttonStyle(.borderless)
						// ".borderless" on macOS somehow renders in gray foreground color,
						// which looks like the button is disabled.
						#if os(macOS)
							.foregroundStyle(.foreground)
						#endif
						.disabled(model.pages[item]?.isLoading() ?? false)
					default:
						Row(item)
					}
				}
				.navigationTitle(list.title)
				#if os(macOS)
					.navigationSubtitle(list.subtitle ?? "")
				#endif
			}
		}
		// As the page title can't be available until the data is loaded,
		// the newly created navigation stack fallbacks to the application
		// name ("Plac".) This causes <previous title> -> "Plac" -> <title>
		// sequence in a very short period, which results in glitchy-looking
		// title flash. To prevent this, the stack itself sets empty title
		// when an item is not available (= root page of a hierarchy) so the
		// title "blinks" instead of "rapidly changes."
		.navigationTitle(item?.title ?? "")
	}

	init(model: BrowsingDataModel, item: BrowseService.Item? = nil) {
		self.model = model
		self.item = item
	}
}

private struct Row: View {
	private let item: BrowseService.Item

	fileprivate init(_ item: BrowseService.Item) {
		self.item = item
	}

	var body: some View {
		HStack {
			if let imageKey = item.imageKey {
				Artwork(imageKey: imageKey, width: 64, height: 64)
					.frame(width: 32, height: 32)
			}

			VStack(alignment: .leading) {
				Text(item.title)
					.font(.headline)
					.lineLimit(1)

				if let subtitle = item.subtitle {
					Text(subtitle)
						.font(.subheadline)
						.lineLimit(1)
				}
			}
			.frame(maxWidth: .infinity, alignment: .leading)
		}
		.padding(.vertical, 2)
	}
}