Puzzles

SVSim.Database/Repositories/Viewer/PuzzleClearRepository.cs

@@ -0,0 +1,59 @@
+using Microsoft.EntityFrameworkCore;
+using SVSim.Database.Models;
+
+namespace SVSim.Database.Repositories.Viewer;
+
+public class PuzzleClearRepository : IPuzzleClearRepository
+{
+    private readonly SVSimDbContext _db;
+    public PuzzleClearRepository(SVSimDbContext db) => _db = db;
+
+    public async Task<HashSet<int>> GetClearedPuzzleIds(long viewerId)
+    {
+        var ids = await _db.ViewerPuzzleClears
+            .Where(c => c.ViewerId == viewerId)
+            .Select(c => c.PuzzleId)
+            .ToListAsync();
+        return ids.ToHashSet();
+    }
+
+    public async Task<Dictionary<int, HashSet<int>>> GetClearedPuzzleIdsByGroup(long viewerId)
+    {
+        // Join via Puzzles to resolve each cleared PuzzleId to its GroupId.
+        var rows = await (
+            from c in _db.ViewerPuzzleClears
+            where c.ViewerId == viewerId
+            join p in _db.Puzzles on c.PuzzleId equals p.Id
+            select new { p.GroupId, c.PuzzleId }
+        ).ToListAsync();
+
+        return rows
+            .GroupBy(r => r.GroupId)
+            .ToDictionary(g => g.Key, g => g.Select(r => r.PuzzleId).ToHashSet());
+    }
+
+    public async Task UpsertClearAsync(long viewerId, int puzzleId, int retryCount)
+    {
+        // CONCURRENCY: this read-then-write is not isolated. Two simultaneous /finish calls
+        // for the same (viewer, puzzle) could both insert and one will lose to the PK. The
+        // wider mission-completion concurrency note lives on PuzzleController.Finish.
+        var existing = await _db.ViewerPuzzleClears
+            .FirstOrDefaultAsync(c => c.ViewerId == viewerId && c.PuzzleId == puzzleId);
+
+        if (existing is null)
+        {
+            _db.ViewerPuzzleClears.Add(new ViewerPuzzleClear
+            {
+                ViewerId = viewerId,
+                PuzzleId = puzzleId,
+                ClearedAt = DateTime.UtcNow,
+                BestRetryCount = retryCount,
+            });
+        }
+        else
+        {
+            existing.BestRetryCount = Math.Min(existing.BestRetryCount, retryCount);
+        }
+        await _db.SaveChangesAsync();
+    }
+}