1. 1
2. 2
3. 3
4. 4
5. 5
6. 6
7. 7
8. 8
9. 9
10. 10
11. 11
12. 12
13. 13
14. 14
15. 15
16. 16
17. 17
18. 18
19. 19
20. 20
21. 21
22. 22
23. 23
24. 24
25. 25
26. 26
27. 27
28. 28
29. 29
30. 30
31. 31
32. 32
33. 33
34. 34
35. 35
36. 36
37. 37
38. 38
39. 39
40. 40
41. 41
42. 42
43. 43
44. 44
45. 45
46. 46
47. 47
48. 48
49. 49
50. 50
51. 51
52. 52
53. 53
54. 54
55. 55
56. 56
57. 57
58. 58
59. 59
60. 60
61. 61
62. 62
63. 63
64. 64
65. 65
66. 66
67. 67
68. 68
69. 69
70. 70
71. 71
72. 72
73. 73
74. 74
75. 75
76. 76
77. 77
78. 78
79. 79
80. 80
81. 81
82. 82
83. 83
84. 84
85. 85
86. 86
87. 87
88. 88
89. 89
90. 90
91. 91
92. 92
93. 93
94. 94
95. 95
96. 96
97. 97
98. 98
99. 99
100. 100
101. 101
102. 102
103. 103
104. 104
105. 105
106. 106
107. 107
108. 108
109. 109
110. 110
111. 111
112. 112
113. 113
114. 114
115. 115
116. 116
117. 117
118. 118
119. 119
120. 120
121. 121
122. 122
123. 123
124. 124
125. 125
126. 126
127. 127
128. 128
129. 129
130. 130
131. 131
132. 132
133. 133
134. 134
135. 135
136. 136
137. 137
138. 138
139. 139
140. 140
141. 141
142. 142
143. 143
144. 144
145. 145
146. 146
147. 147
148. 148
149. 149

// 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 groups)):
				List {
					ForEach(groups) { group in
						Section {
							ForEach(group.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)
								}
							}
						} header: {
							if let title = group.title {
								Text(title)
							} else {
								EmptyView()
							}
						}
					}
				}
				.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)
	}
}