feature: NEWS2 Composite Scoring Engine

2026-06-18 17:39:31 +08:00
parent c3fbc20ddc
commit e6f7989298
31 changed files with 3118 additions and 45 deletions
@@ -0,0 +1,50 @@
+using Microsoft.EntityFrameworkCore;
+
+public class News2Service : INews2Service
+{
+    private readonly AppDbContext _db;
+
+    public News2Service(AppDbContext db) => _db = db;
+
+    public async Task<News2Score?> GetCurrentAsync(Guid encounterId)
+    {
+        return await _db.News2Scores
+            .AsNoTracking()
+            .Where(s => s.EncounterId == encounterId)
+            .OrderByDescending(s => s.CalculatedAt)
+            .FirstOrDefaultAsync();
+    }
+
+    public async Task<CursorPage<News2Score>> GetHistoryAsync(
+        Guid encounterId, int limit, string? cursorToken)
+    {
+        limit = Math.Clamp(limit, 1, 100);
+        var cursor = News2ScoreCursor.Decode(cursorToken);
+
+        var query = _db.News2Scores
+            .AsNoTracking()
+            .Where(s => s.EncounterId == encounterId);
+
+        if (cursor is not null)
+        {
+            query = query.Where(s =>
+                s.CalculatedAt < cursor.CalculatedAt ||
+                (s.CalculatedAt == cursor.CalculatedAt && s.Id.CompareTo(cursor.Id) < 0));
+        }
+
+        var items = await query
+            .OrderByDescending(s => s.CalculatedAt)
+            .ThenByDescending(s => s.Id)
+            .Take(limit + 1)
+            .ToListAsync();
+
+        var hasMore = items.Count > limit;
+        if (hasMore) items.RemoveAt(limit);
+
+        var nextCursor = hasMore
+            ? new News2ScoreCursor(items[^1].CalculatedAt, items[^1].Id).Encode()
+            : null;
+
+        return new CursorPage<News2Score>(items, nextCursor, hasMore);
+    }
+}