refactor to unify data fetching and define abstract API for re-use

Jellyfin.Plugin.SRFPlay/Services/Interfaces/ICategoryService.cs

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+using System.Collections.Generic;
+using System.Threading;
+using System.Threading.Tasks;
+using Jellyfin.Plugin.SRFPlay.Api.Models;
+
+namespace Jellyfin.Plugin.SRFPlay.Services.Interfaces;
+
+/// <summary>
+/// Interface for managing topic/category data and filtering.
+/// </summary>
+public interface ICategoryService
+{
+    /// <summary>
+    /// Gets all topics for a business unit.
+    /// </summary>
+    /// <param name="businessUnit">The business unit.</param>
+    /// <param name="cancellationToken">The cancellation token.</param>
+    /// <returns>List of topics.</returns>
+    Task<List<PlayV3Topic>> GetTopicsAsync(string businessUnit, CancellationToken cancellationToken = default);
+
+    /// <summary>
+    /// Gets a topic by ID.
+    /// </summary>
+    /// <param name="topicId">The topic ID.</param>
+    /// <param name="businessUnit">The business unit.</param>
+    /// <param name="cancellationToken">The cancellation token.</param>
+    /// <returns>The topic, or null if not found.</returns>
+    Task<PlayV3Topic?> GetTopicByIdAsync(string topicId, string businessUnit, CancellationToken cancellationToken = default);
+
+    /// <summary>
+    /// Filters shows by topic ID.
+    /// </summary>
+    /// <param name="shows">The shows to filter.</param>
+    /// <param name="topicId">The topic ID to filter by.</param>
+    /// <returns>Filtered list of shows.</returns>
+    IReadOnlyList<PlayV3Show> FilterShowsByTopic(IReadOnlyList<PlayV3Show> shows, string topicId);
+
+    /// <summary>
+    /// Groups shows by their topics.
+    /// </summary>
+    /// <param name="shows">The shows to group.</param>
+    /// <returns>Dictionary mapping topic IDs to shows.</returns>
+    IReadOnlyDictionary<string, List<PlayV3Show>> GroupShowsByTopics(IReadOnlyList<PlayV3Show> shows);
+
+    /// <summary>
+    /// Gets shows for a specific topic, sorted by number of episodes.
+    /// </summary>
+    /// <param name="topicId">The topic ID.</param>
+    /// <param name="businessUnit">The business unit.</param>
+    /// <param name="maxResults">Maximum number of results to return.</param>
+    /// <param name="cancellationToken">The cancellation token.</param>
+    /// <returns>List of shows for the topic.</returns>
+    Task<List<PlayV3Show>> GetShowsByTopicAsync(
+        string topicId,
+        string businessUnit,
+        int maxResults = 50,
+        CancellationToken cancellationToken = default);
+
+    /// <summary>
+    /// Gets video count for each topic.
+    /// </summary>
+    /// <param name="shows">The shows to analyze.</param>
+    /// <returns>Dictionary mapping topic IDs to video counts.</returns>
+    IReadOnlyDictionary<string, int> GetVideoCountByTopic(IReadOnlyList<PlayV3Show> shows);
+
+    /// <summary>
+    /// Clears the topics cache.
+    /// </summary>
+    void ClearCache();
+}

Jellyfin.Plugin.SRFPlay/Services/Interfaces/IContentExpirationService.cs

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+using System.Threading;
+using System.Threading.Tasks;
+
+namespace Jellyfin.Plugin.SRFPlay.Services.Interfaces;
+
+/// <summary>
+/// Interface for managing content expiration.
+/// </summary>
+public interface IContentExpirationService
+{
+    /// <summary>
+    /// Checks for expired content and removes it from the library.
+    /// </summary>
+    /// <param name="cancellationToken">The cancellation token.</param>
+    /// <returns>The number of items removed.</returns>
+    Task<int> CheckAndRemoveExpiredContentAsync(CancellationToken cancellationToken);
+
+    /// <summary>
+    /// Gets statistics about content expiration.
+    /// </summary>
+    /// <param name="cancellationToken">The cancellation token.</param>
+    /// <returns>Tuple with total count, expired count, and items expiring soon.</returns>
+    Task<(int Total, int Expired, int ExpiringSoon)> GetExpirationStatisticsAsync(CancellationToken cancellationToken);
+}

Jellyfin.Plugin.SRFPlay/Services/Interfaces/IContentRefreshService.cs

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+using System.Collections.Generic;
+using System.Threading;
+using System.Threading.Tasks;
+
+namespace Jellyfin.Plugin.SRFPlay.Services.Interfaces;
+
+/// <summary>
+/// Interface for refreshing content from SRF API.
+/// </summary>
+public interface IContentRefreshService
+{
+    /// <summary>
+    /// Refreshes latest content from SRF API using Play v3.
+    /// </summary>
+    /// <param name="cancellationToken">The cancellation token.</param>
+    /// <returns>List of URNs for new content.</returns>
+    Task<List<string>> RefreshLatestContentAsync(CancellationToken cancellationToken);
+
+    /// <summary>
+    /// Refreshes trending content from SRF API using Play v3.
+    /// </summary>
+    /// <param name="cancellationToken">The cancellation token.</param>
+    /// <returns>List of URNs for trending content.</returns>
+    Task<List<string>> RefreshTrendingContentAsync(CancellationToken cancellationToken);
+
+    /// <summary>
+    /// Refreshes all content (latest and trending).
+    /// </summary>
+    /// <param name="cancellationToken">The cancellation token.</param>
+    /// <returns>Tuple with counts of latest and trending items.</returns>
+    Task<(int LatestCount, int TrendingCount)> RefreshAllContentAsync(CancellationToken cancellationToken);
+
+    /// <summary>
+    /// Gets content recommendations (combines latest and trending).
+    /// </summary>
+    /// <param name="cancellationToken">The cancellation token.</param>
+    /// <returns>List of recommended URNs.</returns>
+    Task<List<string>> GetRecommendedContentAsync(CancellationToken cancellationToken);
+}

Jellyfin.Plugin.SRFPlay/Services/Interfaces/IMediaCompositionFetcher.cs

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+using System.Threading;
+using System.Threading.Tasks;
+using Jellyfin.Plugin.SRFPlay.Api.Models;
+
+namespace Jellyfin.Plugin.SRFPlay.Services.Interfaces;
+
+/// <summary>
+/// Interface for fetching media composition with caching support.
+/// </summary>
+public interface IMediaCompositionFetcher
+{
+    /// <summary>
+    /// Gets media composition by URN, using cache if available.
+    /// </summary>
+    /// <param name="urn">The URN to fetch.</param>
+    /// <param name="cancellationToken">Cancellation token.</param>
+    /// <param name="cacheDurationOverride">Optional override for cache duration (e.g., 5 min for livestreams).</param>
+    /// <returns>The media composition, or null if not found.</returns>
+    Task<MediaComposition?> GetMediaCompositionAsync(
+        string urn,
+        CancellationToken cancellationToken,
+        int? cacheDurationOverride = null);
+}

Jellyfin.Plugin.SRFPlay/Services/Interfaces/IMetadataCache.cs

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+using Jellyfin.Plugin.SRFPlay.Api.Models;
+
+namespace Jellyfin.Plugin.SRFPlay.Services.Interfaces;
+
+/// <summary>
+/// Interface for caching metadata from SRF API.
+/// </summary>
+public interface IMetadataCache
+{
+    /// <summary>
+    /// Gets cached media composition by URN.
+    /// </summary>
+    /// <param name="urn">The URN.</param>
+    /// <param name="cacheDurationMinutes">The cache duration in minutes.</param>
+    /// <returns>The cached media composition, or null if not found or expired.</returns>
+    MediaComposition? GetMediaComposition(string urn, int cacheDurationMinutes);
+
+    /// <summary>
+    /// Sets media composition in cache.
+    /// </summary>
+    /// <param name="urn">The URN.</param>
+    /// <param name="mediaComposition">The media composition to cache.</param>
+    void SetMediaComposition(string urn, MediaComposition mediaComposition);
+
+    /// <summary>
+    /// Removes media composition from cache.
+    /// </summary>
+    /// <param name="urn">The URN.</param>
+    void RemoveMediaComposition(string urn);
+
+    /// <summary>
+    /// Clears all cached data.
+    /// </summary>
+    void Clear();
+
+    /// <summary>
+    /// Gets the cache statistics.
+    /// </summary>
+    /// <returns>A tuple with cache count and size estimate.</returns>
+    (int Count, long SizeEstimate) GetStatistics();
+}

Jellyfin.Plugin.SRFPlay/Services/Interfaces/IStreamProxyService.cs

@@ -0,0 +1,56 @@
+using System.Threading;
+using System.Threading.Tasks;
+
+namespace Jellyfin.Plugin.SRFPlay.Services.Interfaces;
+
+/// <summary>
+/// Interface for proxying SRF Play streams and managing authentication.
+/// </summary>
+public interface IStreamProxyService
+{
+    /// <summary>
+    /// Registers a stream for proxying.
+    /// </summary>
+    /// <param name="itemId">The item ID.</param>
+    /// <param name="authenticatedUrl">The authenticated stream URL.</param>
+    /// <param name="urn">The SRF URN for this content (used for re-fetching fresh URLs).</param>
+    /// <param name="isLiveStream">Whether this is a livestream (livestreams always fetch fresh URLs).</param>
+    void RegisterStream(string itemId, string authenticatedUrl, string? urn = null, bool isLiveStream = false);
+
+    /// <summary>
+    /// Gets stream metadata for an item (URN and isLiveStream flag).
+    /// </summary>
+    /// <param name="itemId">The item ID.</param>
+    /// <returns>A tuple of (URN, IsLiveStream), or null if not found.</returns>
+    (string? Urn, bool IsLiveStream)? GetStreamMetadata(string itemId);
+
+    /// <summary>
+    /// Gets the authenticated URL for an item.
+    /// </summary>
+    /// <param name="itemId">The item ID.</param>
+    /// <returns>The authenticated URL, or null if not found or expired.</returns>
+    string? GetAuthenticatedUrl(string itemId);
+
+    /// <summary>
+    /// Fetches and rewrites an HLS manifest to use proxy URLs.
+    /// </summary>
+    /// <param name="itemId">The item ID.</param>
+    /// <param name="baseProxyUrl">The base proxy URL.</param>
+    /// <param name="cancellationToken">Cancellation token.</param>
+    /// <returns>The rewritten manifest content.</returns>
+    Task<string?> GetRewrittenManifestAsync(string itemId, string baseProxyUrl, CancellationToken cancellationToken = default);
+
+    /// <summary>
+    /// Fetches a segment from the original source.
+    /// </summary>
+    /// <param name="itemId">The item ID.</param>
+    /// <param name="segmentPath">The segment path.</param>
+    /// <param name="cancellationToken">Cancellation token.</param>
+    /// <returns>The segment content as bytes.</returns>
+    Task<byte[]?> GetSegmentAsync(string itemId, string segmentPath, CancellationToken cancellationToken = default);
+
+    /// <summary>
+    /// Cleans up old and expired stream mappings.
+    /// </summary>
+    void CleanupOldMappings();
+}

Jellyfin.Plugin.SRFPlay/Services/Interfaces/IStreamUrlResolver.cs

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+using System.Threading;
+using System.Threading.Tasks;
+using Jellyfin.Plugin.SRFPlay.Api.Models;
+using Jellyfin.Plugin.SRFPlay.Configuration;
+
+namespace Jellyfin.Plugin.SRFPlay.Services.Interfaces;
+
+/// <summary>
+/// Interface for resolving stream URLs from media composition resources.
+/// </summary>
+public interface IStreamUrlResolver
+{
+    /// <summary>
+    /// Gets the best stream URL from a chapter based on quality preference.
+    /// </summary>
+    /// <param name="chapter">The chapter containing resources.</param>
+    /// <param name="qualityPreference">The quality preference.</param>
+    /// <returns>The stream URL, or null if no suitable stream found.</returns>
+    string? GetStreamUrl(Chapter chapter, QualityPreference qualityPreference);
+
+    /// <summary>
+    /// Checks if a chapter has non-DRM playable content.
+    /// </summary>
+    /// <param name="chapter">The chapter to check.</param>
+    /// <returns>True if playable content is available.</returns>
+    bool HasPlayableContent(Chapter chapter);
+
+    /// <summary>
+    /// Checks if content is expired based on ValidTo date.
+    /// </summary>
+    /// <param name="chapter">The chapter to check.</param>
+    /// <returns>True if the content is expired.</returns>
+    bool IsContentExpired(Chapter chapter);
+
+    /// <summary>
+    /// Authenticates a stream URL by fetching an Akamai token.
+    /// </summary>
+    /// <param name="streamUrl">The unauthenticated stream URL.</param>
+    /// <param name="cancellationToken">Cancellation token.</param>
+    /// <returns>The authenticated stream URL with token.</returns>
+    Task<string> GetAuthenticatedStreamUrlAsync(string streamUrl, CancellationToken cancellationToken = default);
+}