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 QuestionsApi.Services.Flashcards;
+using Xunit;
+
+namespace QuestionsApi.Tests;
+
+public sealed class FlashcardSchedulingTests
+{
+    [Fact]
+    public void NextStudyDayStart_IsMidnightOfTheFollowingDay()
+    {
+        var studyDayStart = new DateTime(2026, 3, 5, 0, 0, 0, DateTimeKind.Utc);
+
+        var next = FlashcardScheduling.NextStudyDayStart(studyDayStart);
+
+        Assert.Equal(new DateTime(2026, 3, 6, 0, 0, 0, DateTimeKind.Utc), next);
+    }
+
+    [Fact]
+    public void NextStudyDayStart_TruncatesTimeOfDayBeforeAdvancing()
+    {
+        // A session that started mid-day still buries siblings until the *next calendar day*,
+        // not exactly 24h later.
+        var studyDayStart = new DateTime(2026, 3, 5, 14, 30, 0, DateTimeKind.Utc);
+
+        var next = FlashcardScheduling.NextStudyDayStart(studyDayStart);
+
+        Assert.Equal(new DateTime(2026, 3, 6, 0, 0, 0, DateTimeKind.Utc), next);
+    }
+
+    [Theory]
+    [InlineData(20, null, 0, 20)]
+    [InlineData(20, null, 15, 5)]
+    [InlineData(20, null, 25, 0)]
+    [InlineData(20, 5, 0, 5)]
+    [InlineData(20, 0, 0, 0)]
+    public void ResolveDailyBudget_DeckOverrideWinsOverGlobal_ClampedAtZero(
+        int globalLimit, int? deckOverride, int consumedToday, int expected)
+    {
+        Assert.Equal(expected, FlashcardScheduling.ResolveDailyBudget(globalLimit, deckOverride, consumedToday));
+    }
+}