feat: prioritise and blacklist media and overview in setting page of progress in adding info

Jellyfin.Plugin.JRay/Services/MediaPolicyStore.cs

@@ -0,0 +1,139 @@
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Text.Json;
+using System.Text.Json.Serialization;
+using Jellyfin.Plugin.JRay.Models;
+using Jellyfin.Plugin.JRay.Services.Interfaces;
+using MediaBrowser.Common.Configuration;
+using Microsoft.Extensions.Logging;
+
+namespace Jellyfin.Plugin.JRay.Services;
+
+/// <summary>
+/// Persists the prioritise/ignore rules to a single JSON file under the
+/// plugin's configuration directory, and keeps an in-memory copy for fast
+/// reads. All access is synchronised so the work-discovery API and the
+/// config page can touch it concurrently.
+/// </summary>
+public sealed class MediaPolicyStore : IMediaPolicyStore
+{
+    private static readonly JsonSerializerOptions JsonOptions = new(JsonSerializerDefaults.Web)
+    {
+        WriteIndented = true,
+        Converters = { new JsonStringEnumConverter() }
+    };
+
+    private readonly IApplicationPaths _applicationPaths;
+    private readonly ILogger<MediaPolicyStore> _logger;
+    private readonly object _gate = new();
+    private List<MediaPolicyRule>? _rules;
+
+    /// <summary>
+    /// Initializes a new instance of the <see cref="MediaPolicyStore"/> class.
+    /// </summary>
+    /// <param name="applicationPaths">The Jellyfin application paths.</param>
+    /// <param name="logger">The logger.</param>
+    public MediaPolicyStore(IApplicationPaths applicationPaths, ILogger<MediaPolicyStore> logger)
+    {
+        _applicationPaths = applicationPaths;
+        _logger = logger;
+    }
+
+    /// <inheritdoc />
+    public IReadOnlyList<MediaPolicyRule> GetRules()
+    {
+        lock (_gate)
+        {
+            return EnsureLoaded().ToList();
+        }
+    }
+
+    /// <inheritdoc />
+    public void SetRule(MediaPolicyRule rule)
+    {
+        ArgumentNullException.ThrowIfNull(rule);
+
+        lock (_gate)
+        {
+            var rules = EnsureLoaded();
+            rules.RemoveAll(r => r.Scope == rule.Scope && ValueEquals(r.Value, rule.Value));
+            rules.Add(rule);
+            Save(rules);
+        }
+    }
+
+    /// <inheritdoc />
+    public bool RemoveRule(PolicyScope scope, string value)
+    {
+        lock (_gate)
+        {
+            var rules = EnsureLoaded();
+            var removed = rules.RemoveAll(r => r.Scope == scope && ValueEquals(r.Value, value));
+            if (removed > 0)
+            {
+                Save(rules);
+                return true;
+            }
+
+            return false;
+        }
+    }
+
+    private static bool ValueEquals(string a, string b)
+    {
+        // Genre names are matched case-insensitively; ids happen to be
+        // case-insensitive too (GUID strings), so a single comparison suffices.
+        return string.Equals(a, b, StringComparison.OrdinalIgnoreCase);
+    }
+
+    private List<MediaPolicyRule> EnsureLoaded()
+    {
+        if (_rules is not null)
+        {
+            return _rules;
+        }
+
+        var path = GetPath();
+        if (!File.Exists(path))
+        {
+            _rules = new List<MediaPolicyRule>();
+            return _rules;
+        }
+
+        try
+        {
+            using var stream = File.OpenRead(path);
+            _rules = JsonSerializer.Deserialize<List<MediaPolicyRule>>(stream, JsonOptions)
+                     ?? new List<MediaPolicyRule>();
+        }
+        catch (Exception ex) when (ex is IOException or JsonException)
+        {
+            _logger.LogWarning(ex, "JRay: failed to read media policy file {Path}; starting empty", path);
+            _rules = new List<MediaPolicyRule>();
+        }
+
+        return _rules;
+    }
+
+    private void Save(List<MediaPolicyRule> rules)
+    {
+        var path = GetPath();
+        var directory = Path.GetDirectoryName(path) ?? throw new InvalidOperationException("Media policy path has no directory.");
+        Directory.CreateDirectory(directory);
+
+        var tempPath = path + ".tmp";
+        using (var stream = File.Create(tempPath))
+        {
+            JsonSerializer.Serialize(stream, rules, JsonOptions);
+        }
+
+        File.Move(tempPath, path, overwrite: true);
+    }
+
+    private string GetPath()
+    {
+        return Path.Combine(_applicationPaths.PluginConfigurationsPath, "JRay", "policy.json");
+    }
+}