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| 1 | +/* |
| 2 | + * ThreadPilot - Advanced Windows Process and Power Plan Manager |
| 3 | + * Copyright (C) 2025 Prime Build |
| 4 | + * |
| 5 | + * This program is free software: you can redistribute it and/or modify |
| 6 | + * it under the terms of the GNU Affero General Public License as published by |
| 7 | + * the Free Software Foundation, version 3 only. |
| 8 | + * |
| 9 | + * This program is distributed in the hope that it will be useful, |
| 10 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 12 | + * GNU Affero General Public License for more details. |
| 13 | + * |
| 14 | + * You should have received a copy of the GNU Affero General Public License |
| 15 | + * along with this program. If not, see <https://www.gnu.org/licenses/>. |
| 16 | + */ |
| 17 | +namespace ThreadPilot.Services |
| 18 | +{ |
| 19 | + using System; |
| 20 | + using System.Collections.Generic; |
| 21 | + using System.Windows; |
| 22 | + using Microsoft.Extensions.Logging; |
| 23 | + |
| 24 | + /// <summary> |
| 25 | + /// Service for managing application localization and display language. |
| 26 | + /// </summary> |
| 27 | + public class LocalizationService : ILocalizationService |
| 28 | + { |
| 29 | + public const string DefaultLanguage = "en-US"; |
| 30 | + public const string SimplifiedChineseLanguage = "zh-CN"; |
| 31 | + |
| 32 | + private const string EnUsDictionaryPath = "Locales/en-US.xaml"; |
| 33 | + private const string ZhCnDictionaryPath = "Locales/zh-CN.xaml"; |
| 34 | + |
| 35 | + private readonly ILogger<LocalizationService> logger; |
| 36 | + private readonly IReadOnlyDictionary<string, string>? englishStrings; |
| 37 | + private readonly IReadOnlyDictionary<string, string>? chineseStrings; |
| 38 | + private ResourceDictionary? activeLocaleDictionary; |
| 39 | + private ResourceDictionary? englishFallbackDictionary; |
| 40 | + private Uri? activeLocaleUri; |
| 41 | + |
| 42 | + public string CurrentLanguage { get; private set; } = DefaultLanguage; |
| 43 | + |
| 44 | + public event EventHandler<string>? LanguageChanged; |
| 45 | + |
| 46 | + public LocalizationService(ILogger<LocalizationService> logger) |
| 47 | + : this(logger, englishStrings: null, chineseStrings: null) |
| 48 | + { |
| 49 | + } |
| 50 | + |
| 51 | + public LocalizationService( |
| 52 | + ILogger<LocalizationService> logger, |
| 53 | + IReadOnlyDictionary<string, string>? englishStrings, |
| 54 | + IReadOnlyDictionary<string, string>? chineseStrings) |
| 55 | + { |
| 56 | + this.logger = logger ?? throw new ArgumentNullException(nameof(logger)); |
| 57 | + this.englishStrings = englishStrings; |
| 58 | + this.chineseStrings = chineseStrings; |
| 59 | + } |
| 60 | + |
| 61 | + public static string NormalizeLanguage(string? language) |
| 62 | + { |
| 63 | + if (string.Equals(language, SimplifiedChineseLanguage, StringComparison.OrdinalIgnoreCase)) |
| 64 | + { |
| 65 | + return SimplifiedChineseLanguage; |
| 66 | + } |
| 67 | + |
| 68 | + return DefaultLanguage; |
| 69 | + } |
| 70 | + |
| 71 | + public void ApplyLanguage(string? language) |
| 72 | + { |
| 73 | + var normalizedLanguage = NormalizeLanguage(language); |
| 74 | + var targetUri = new Uri(GetDictionaryPath(normalizedLanguage), UriKind.Relative); |
| 75 | + |
| 76 | + this.CurrentLanguage = normalizedLanguage; |
| 77 | + |
| 78 | + var appResources = System.Windows.Application.Current?.Resources; |
| 79 | + if (appResources == null) |
| 80 | + { |
| 81 | + this.activeLocaleUri = targetUri; |
| 82 | + this.LanguageChanged?.Invoke(this, normalizedLanguage); |
| 83 | + return; |
| 84 | + } |
| 85 | + |
| 86 | + try |
| 87 | + { |
| 88 | + ResourceDictionary? matchingDictionary = null; |
| 89 | + for (var i = appResources.MergedDictionaries.Count - 1; i >= 0; i--) |
| 90 | + { |
| 91 | + var dictionary = appResources.MergedDictionaries[i]; |
| 92 | + var source = dictionary.Source?.OriginalString; |
| 93 | + if (IsLocaleDictionary(source)) |
| 94 | + { |
| 95 | + if (matchingDictionary == null && |
| 96 | + string.Equals(source, targetUri.OriginalString, StringComparison.OrdinalIgnoreCase)) |
| 97 | + { |
| 98 | + matchingDictionary = dictionary; |
| 99 | + continue; |
| 100 | + } |
| 101 | + |
| 102 | + appResources.MergedDictionaries.RemoveAt(i); |
| 103 | + } |
| 104 | + } |
| 105 | + |
| 106 | + if (matchingDictionary != null) |
| 107 | + { |
| 108 | + appResources.MergedDictionaries.Remove(matchingDictionary); |
| 109 | + appResources.MergedDictionaries.Insert(0, matchingDictionary); |
| 110 | + this.activeLocaleDictionary = matchingDictionary; |
| 111 | + } |
| 112 | + else |
| 113 | + { |
| 114 | + var nextDictionary = new ResourceDictionary { Source = targetUri }; |
| 115 | + appResources.MergedDictionaries.Insert(0, nextDictionary); |
| 116 | + this.activeLocaleDictionary = nextDictionary; |
| 117 | + } |
| 118 | + |
| 119 | + this.activeLocaleUri = targetUri; |
| 120 | + this.logger.LogInformation("Applied display language {Language}", normalizedLanguage); |
| 121 | + this.LanguageChanged?.Invoke(this, normalizedLanguage); |
| 122 | + } |
| 123 | + catch (Exception ex) |
| 124 | + { |
| 125 | + this.logger.LogError(ex, "Failed to apply language {Language}", normalizedLanguage); |
| 126 | + } |
| 127 | + } |
| 128 | + |
| 129 | + public string GetString(string key) |
| 130 | + { |
| 131 | + if (string.IsNullOrWhiteSpace(key)) |
| 132 | + { |
| 133 | + return string.Empty; |
| 134 | + } |
| 135 | + |
| 136 | + if (this.TryGetStringFromOverrides(this.CurrentLanguage, key, out var localized)) |
| 137 | + { |
| 138 | + return localized; |
| 139 | + } |
| 140 | + |
| 141 | + if (this.TryGetStringFromApplicationResources(key, out localized)) |
| 142 | + { |
| 143 | + return localized; |
| 144 | + } |
| 145 | + |
| 146 | + if (this.activeLocaleDictionary != null && TryGetString(this.activeLocaleDictionary, key, out localized)) |
| 147 | + { |
| 148 | + return localized; |
| 149 | + } |
| 150 | + |
| 151 | + if (this.CurrentLanguage != DefaultLanguage && |
| 152 | + this.TryGetStringFromOverrides(DefaultLanguage, key, out localized)) |
| 153 | + { |
| 154 | + return localized; |
| 155 | + } |
| 156 | + |
| 157 | + if (this.CurrentLanguage != DefaultLanguage && |
| 158 | + this.TryGetStringFromEnglishFallbackDictionary(key, out localized)) |
| 159 | + { |
| 160 | + return localized; |
| 161 | + } |
| 162 | + |
| 163 | + return key; |
| 164 | + } |
| 165 | + |
| 166 | + private static string GetDictionaryPath(string language) |
| 167 | + { |
| 168 | + return language == SimplifiedChineseLanguage ? ZhCnDictionaryPath : EnUsDictionaryPath; |
| 169 | + } |
| 170 | + |
| 171 | + private static bool IsLocaleDictionary(string? source) |
| 172 | + { |
| 173 | + return !string.IsNullOrWhiteSpace(source) && |
| 174 | + (source.EndsWith(EnUsDictionaryPath, StringComparison.OrdinalIgnoreCase) || |
| 175 | + source.EndsWith(ZhCnDictionaryPath, StringComparison.OrdinalIgnoreCase)); |
| 176 | + } |
| 177 | + |
| 178 | + private static bool TryGetString(ResourceDictionary dictionary, string key, out string value) |
| 179 | + { |
| 180 | + if (dictionary.Contains(key) && dictionary[key] is string text && !string.IsNullOrEmpty(text)) |
| 181 | + { |
| 182 | + value = text; |
| 183 | + return true; |
| 184 | + } |
| 185 | + |
| 186 | + value = string.Empty; |
| 187 | + return false; |
| 188 | + } |
| 189 | + |
| 190 | + private bool TryGetStringFromOverrides(string language, string key, out string value) |
| 191 | + { |
| 192 | + var source = language == SimplifiedChineseLanguage ? this.chineseStrings : this.englishStrings; |
| 193 | + if (source != null && source.TryGetValue(key, out var text) && !string.IsNullOrEmpty(text)) |
| 194 | + { |
| 195 | + value = text; |
| 196 | + return true; |
| 197 | + } |
| 198 | + |
| 199 | + value = string.Empty; |
| 200 | + return false; |
| 201 | + } |
| 202 | + |
| 203 | + private bool TryGetStringFromApplicationResources(string key, out string value) |
| 204 | + { |
| 205 | + value = string.Empty; |
| 206 | + var app = System.Windows.Application.Current; |
| 207 | + if (app == null) |
| 208 | + { |
| 209 | + return false; |
| 210 | + } |
| 211 | + |
| 212 | + try |
| 213 | + { |
| 214 | + if (app.Dispatcher.CheckAccess()) |
| 215 | + { |
| 216 | + return TryGetApplicationResourceValue(app, key, out value); |
| 217 | + } |
| 218 | + |
| 219 | + var found = false; |
| 220 | + var dispatcherValue = string.Empty; |
| 221 | + app.Dispatcher.Invoke(() => |
| 222 | + { |
| 223 | + found = TryGetApplicationResourceValue(app, key, out dispatcherValue); |
| 224 | + }); |
| 225 | + value = dispatcherValue; |
| 226 | + return found; |
| 227 | + } |
| 228 | + catch (Exception ex) |
| 229 | + { |
| 230 | + this.logger.LogDebug(ex, "Failed to read localized resource {Key}", key); |
| 231 | + return false; |
| 232 | + } |
| 233 | + } |
| 234 | + |
| 235 | + private static bool TryGetApplicationResourceValue(System.Windows.Application app, string key, out string value) |
| 236 | + { |
| 237 | + if (app.Resources.Contains(key) && app.Resources[key] is string text && !string.IsNullOrEmpty(text)) |
| 238 | + { |
| 239 | + value = text; |
| 240 | + return true; |
| 241 | + } |
| 242 | + |
| 243 | + value = string.Empty; |
| 244 | + return false; |
| 245 | + } |
| 246 | + |
| 247 | + private bool TryGetStringFromEnglishFallbackDictionary(string key, out string value) |
| 248 | + { |
| 249 | + value = string.Empty; |
| 250 | + try |
| 251 | + { |
| 252 | + this.englishFallbackDictionary ??= new ResourceDictionary |
| 253 | + { |
| 254 | + Source = new Uri(EnUsDictionaryPath, UriKind.Relative), |
| 255 | + }; |
| 256 | + return TryGetString(this.englishFallbackDictionary, key, out value); |
| 257 | + } |
| 258 | + catch (Exception ex) |
| 259 | + { |
| 260 | + this.logger.LogDebug(ex, "Failed to load English fallback localization dictionary"); |
| 261 | + return false; |
| 262 | + } |
| 263 | + } |
| 264 | + } |
| 265 | +} |
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