Extend language code handling

3 files changed, 53 insertions, 34 deletions

diff --git a/Emby.Server.Implementations/Localization/LocalizationManager.cs b/Emby.Server.Implementations/Localization/LocalizationManager.cs
index 6e2a33fd5..166b71b4a 100644
--- a/Emby.Server.Implementations/Localization/LocalizationManager.cs
+++ b/Emby.Server.Implementations/Localization/LocalizationManager.cs
@@ -184,10 +184,19 @@ namespace Emby.Server.Implementations.Localization
         /// <inheritdoc />
         public IEnumerable<ParentalRating> GetParentalRatings()
         {
-            var ratings = GetParentalRatingsDictionary().Values.ToList();
+            // Use server default language for ratings
+            // Fall back to empty list if there are no parental ratings for that language
+            var ratings = GetParentalRatingsDictionary()?.Values.ToList()
+                ?? new List<ParentalRating>();
 
-            // Add common ratings to ensure them being available for selection.
+            // Add common ratings to ensure them being available for selection
             // Based on the US rating system due to it being the main source of rating in the metadata providers
+            // Unrated
+            if (!ratings.Any(x => x.Value is null))
+            {
+                ratings.Add(new ParentalRating("Unrated", null));
+            }
+
             // Minimum rating possible
             if (!ratings.Any(x => x.Value == 0))
             {
@@ -237,36 +246,26 @@ namespace Emby.Server.Implementations.Localization
         /// <summary>
         /// Gets the parental ratings dictionary.
         /// </summary>
+        /// <param name="countryCode">The optional two letter ISO language string.</param>
         /// <returns><see cref="Dictionary{String, ParentalRating}" />.</returns>
-        private Dictionary<string, ParentalRating> GetParentalRatingsDictionary()
+        private Dictionary<string, ParentalRating>? GetParentalRatingsDictionary(string? countryCode = null)
         {
-            var countryCode = _configurationManager.Configuration.MetadataCountryCode;
-
-            // Fall back to US ratings if no country code is specified or country code does not exist.
+            // Fallback to server default if no country code is specified.
             if (string.IsNullOrEmpty(countryCode))
             {
-                countryCode = "us";
+                countryCode = _configurationManager.Configuration.MetadataCountryCode;
             }
 
-            return GetRatings(countryCode)
-                ?? GetRatings("us")
-                ?? throw new InvalidOperationException($"Invalid resource path: '{CountriesPath}'");
-        }
-
-        /// <summary>
-        /// Gets the ratings for a country.
-        /// </summary>
-        /// <param name="countryCode">The country code.</param>
-        /// <returns>The ratings.</returns>
-        private Dictionary<string, ParentalRating>? GetRatings(string countryCode)
-        {
-            _allParentalRatings.TryGetValue(countryCode, out var countryValue);
+            if (_allParentalRatings.TryGetValue(countryCode, out var countryValue))
+            {
+                return countryValue;
+            }
 
-            return countryValue;
+            return null;
         }
 
         /// <inheritdoc />
-        public int? GetRatingLevel(string rating)
+        public int? GetRatingLevel(string rating, string? countryCode = null)
         {
             ArgumentException.ThrowIfNullOrEmpty(rating);
 
@@ -280,32 +279,51 @@ namespace Emby.Server.Implementations.Localization
             rating = rating.Replace("Rated :", string.Empty, StringComparison.OrdinalIgnoreCase);
             rating = rating.Replace("Rated ", string.Empty, StringComparison.OrdinalIgnoreCase);
 
-            var ratingsDictionary = GetParentalRatingsDictionary();
-
-            if (ratingsDictionary.TryGetValue(rating, out ParentalRating? value))
+            // Use rating system matching the language
+            if (!string.IsNullOrEmpty(countryCode))
+            {
+                var ratingsDictionary = GetParentalRatingsDictionary(countryCode);
+                if (ratingsDictionary is not null && ratingsDictionary.TryGetValue(rating, out ParentalRating? value))
+                {
+                    return value.Value;
+                }
+            }
+            else
             {
-                return value.Value;
+                // Fall back to server default language for ratings check
+                // If it has no ratings, use the US ratings
+                var ratingsDictionary = GetParentalRatingsDictionary() ?? GetParentalRatingsDictionary("us");
+                if (ratingsDictionary is not null && ratingsDictionary.TryGetValue(rating, out ParentalRating? value))
+                {
+                    return value.Value;
+                }
             }
 
-            // If we don't find anything check all ratings systems
+            // If we don't find anything, check all ratings systems
             foreach (var dictionary in _allParentalRatings.Values)
             {
-                if (dictionary.TryGetValue(rating, out value))
+                if (dictionary.TryGetValue(rating, out var value))
                 {
                     return value.Value;
                 }
             }
 
-            // Try splitting by : to handle "Germany: FSK 18"
+            // Try splitting by : to handle "Germany: FSK-18"
             if (rating.Contains(':', StringComparison.OrdinalIgnoreCase))
             {
                 return GetRatingLevel(rating.AsSpan().RightPart(':').ToString());
             }
 
-            // Remove prefix country code to handle "DE-18"
+            // Handle prefix country code to handle "DE-18"
             if (rating.Contains('-', StringComparison.OrdinalIgnoreCase))
             {
-                return GetRatingLevel(rating.AsSpan().RightPart('-').ToString());
+                var ratingSpan = rating.AsSpan();
+
+                // Extract culture from country prefix
+                var culture = FindLanguageInfo(ratingSpan.LeftPart('-').ToString());
+
+                // Check rating system of culture
+                return GetRatingLevel(ratingSpan.RightPart('-').ToString(), culture?.TwoLetterISOLanguageName);
             }
 
             return null;
diff --git a/MediaBrowser.Model/Globalization/ILocalizationManager.cs b/MediaBrowser.Model/Globalization/ILocalizationManager.cs
index e00157dce..02a29e7fa 100644
--- a/MediaBrowser.Model/Globalization/ILocalizationManager.cs
+++ b/MediaBrowser.Model/Globalization/ILocalizationManager.cs
@@ -30,8 +30,9 @@ namespace MediaBrowser.Model.Globalization
         /// Gets the rating level.
         /// </summary>
         /// <param name="rating">The rating.</param>
+        /// <param name="countryCode">The optional two letter ISO language string.</param>
         /// <returns><see cref="int" /> or <c>null</c>.</returns>
-        int? GetRatingLevel(string rating);
+        int? GetRatingLevel(string rating, string? countryCode = null);
 
         /// <summary>
         /// Gets the localized string.
diff --git a/tests/Jellyfin.Server.Implementations.Tests/Localization/LocalizationManagerTests.cs b/tests/Jellyfin.Server.Implementations.Tests/Localization/LocalizationManagerTests.cs
index ab3682ccf..7fabe9904 100644
--- a/tests/Jellyfin.Server.Implementations.Tests/Localization/LocalizationManagerTests.cs
+++ b/tests/Jellyfin.Server.Implementations.Tests/Localization/LocalizationManagerTests.cs
@@ -83,7 +83,7 @@ namespace Jellyfin.Server.Implementations.Tests.Localization
             await localizationManager.LoadAll();
             var ratings = localizationManager.GetParentalRatings().ToList();
 
-            Assert.Equal(53, ratings.Count);
+            Assert.Equal(54, ratings.Count);
 
             var tvma = ratings.FirstOrDefault(x => x.Name.Equals("TV-MA", StringComparison.Ordinal));
             Assert.NotNull(tvma);
@@ -100,7 +100,7 @@ namespace Jellyfin.Server.Implementations.Tests.Localization
             await localizationManager.LoadAll();
             var ratings = localizationManager.GetParentalRatings().ToList();
 
-            Assert.Equal(18, ratings.Count);
+            Assert.Equal(19, ratings.Count);
 
             var fsk = ratings.FirstOrDefault(x => x.Name.Equals("FSK-12", StringComparison.Ordinal));
             Assert.NotNull(fsk);