Add flashcards feature with spaced repetition scheduling

Adds a full flashcards system: FSRS-based scheduling, cloze/basic card types, CSV import/export, media storage, and study UI, wired into navigation and the dashboard alongside existing question flows.
2026-07-21 15:08:52 -05:00
parent 29b89dc404
commit 48a8c8361d
41 changed files with 4458 additions and 8 deletions
@@ -0,0 +1,41 @@
+using MongoDB.Bson;
+using MongoDB.Driver;
+using QuestionsApi.Models;
+
+namespace QuestionsApi.Services.Flashcards;
+
+public sealed class FlashcardMediaStore
+{
+    private readonly IMongoCollection<FlashcardMediaAsset> _assets;
+
+    public FlashcardMediaStore(MongoDatabaseProvider mongo)
+    {
+        _assets = mongo.Database.GetCollection<FlashcardMediaAsset>("FlashcardMediaAssets");
+        _assets.Indexes.CreateOne(new CreateIndexModel<FlashcardMediaAsset>(
+            Builders<FlashcardMediaAsset>.IndexKeys.Ascending(v => v.UserId),
+            new CreateIndexOptions { Name = "flashcard_media_user" }));
+    }
+
+    public async Task<FlashcardMediaAsset> CreateAsync(string userId, string fileName, string contentType, byte[] bytes)
+    {
+        var asset = new FlashcardMediaAsset
+        {
+            UserId = userId,
+            FileName = fileName,
+            ContentType = contentType,
+            Bytes = bytes,
+            CreatedUtc = DateTime.UtcNow
+        };
+        await _assets.InsertOneAsync(asset);
+        return asset;
+    }
+
+    public async Task<FlashcardMediaAsset?> GetAsync(string userId, string id)
+    {
+        if (!ObjectId.TryParse(id, out _)) return null;
+        return await _assets.Find(v => v.UserId == userId && v.Id == id).FirstOrDefaultAsync();
+    }
+
+    public Task<long> DeleteAsync(string userId, string id) =>
+        _assets.DeleteOneAsync(v => v.UserId == userId && v.Id == id).ContinueWith(t => t.Result.DeletedCount);
+}