Build flashsharp flashcard app

src/Flashsharp/Pages/Search.cshtml.cs

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+using Flashsharp.Auth;
+using Flashsharp.Data;
+using Flashsharp.Domain;
+using Microsoft.AspNetCore.Mvc.RazorPages;
+
+namespace Flashsharp.Pages;
+
+public sealed class SearchModel(Store store) : PageModel
+{
+    public string? Q { get; private set; }
+
+    public string? Tag { get; private set; }
+
+    public long? CourseId { get; private set; }
+
+    public long? LessonId { get; private set; }
+
+    public long? DeckId { get; private set; }
+
+    public string? ScopeName { get; private set; }
+
+    public IReadOnlyList<CardRef> Results { get; private set; } = [];
+
+    public async Task OnGetAsync(
+        string? q,
+        string? tag,
+        long? courseId,
+        long? lessonId,
+        long? deckId,
+        CancellationToken cancellationToken)
+    {
+        Q = q?.Trim();
+        Tag = tag?.Trim();
+        CourseId = courseId > 0 ? courseId : null;
+        LessonId = lessonId > 0 ? lessonId : null;
+        DeckId = deckId > 0 ? deckId : null;
+
+        if (DeckId is not null)
+        {
+            var deck = await store.GetDeckContextAsync(DeckId.Value, cancellationToken);
+            ScopeName = deck is null ? null : $"{deck.CourseName} / {deck.LessonName} / {deck.Name}";
+        }
+        else if (LessonId is not null)
+        {
+            var lesson = await store.GetLessonAsync(LessonId.Value, User.GetUserId(), cancellationToken);
+            ScopeName = lesson?.Name;
+        }
+        else if (CourseId is not null)
+        {
+            var course = await store.GetCourseAsync(CourseId.Value, User.GetUserId(), cancellationToken);
+            ScopeName = course?.Name;
+        }
+
+        Results = await store.SearchCardsAsync(
+            Q,
+            CourseId,
+            LessonId,
+            DeckId,
+            Tag,
+            50,
+            cancellationToken);
+    }
+}