feat: 商品列表查询改为数据库分页过滤

src/Infrastructure/TakeoutSaaS.Infrastructure/App/Repositories/EfProductRepository.cs

@@ -60,6 +60,93 @@ public sealed class EfProductRepository(TakeoutAppDbContext context) : IProductR
         return products;
     }
 
+    /// <inheritdoc />
+    public async Task<(IReadOnlyList<Product> Items, int Total)> SearchPagedAsync(
+        ProductSearchFilter filter,
+        CancellationToken cancellationToken = default)
+    {
+        if (filter.TenantId <= 0)
+        {
+            throw new InvalidOperationException("TenantId 不能为空且必须大于 0");
+        }
+
+        var page = filter.Page <= 0 ? 1 : filter.Page;
+        var pageSize = filter.PageSize <= 0 ? 20 : filter.PageSize;
+
+        var query = context.Products
+            .AsNoTracking()
+            .Where(x => x.TenantId == filter.TenantId);
+
+        if (filter.StoreId.HasValue)
+        {
+            query = query.Where(x => x.StoreId == filter.StoreId.Value);
+        }
+
+        if (filter.CategoryId.HasValue)
+        {
+            query = query.Where(x => x.CategoryId == filter.CategoryId.Value);
+        }
+
+        if (filter.Status.HasValue)
+        {
+            query = query.Where(x => x.Status == filter.Status.Value);
+        }
+
+        if (!string.IsNullOrWhiteSpace(filter.Keyword))
+        {
+            var keyword = $"%{filter.Keyword.Trim()}%";
+            query = query.Where(x =>
+                EF.Functions.ILike(x.Name, keyword) ||
+                EF.Functions.ILike(x.SpuCode, keyword));
+        }
+
+        if (filter.Kind.HasValue)
+        {
+            query = query.Where(x => x.Kind == filter.Kind.Value);
+        }
+
+        if (filter.IsSoldOut == true)
+        {
+            query = query.Where(x => x.SoldoutMode.HasValue);
+        }
+        else if (filter.Status == ProductStatus.OffShelf)
+        {
+            // 状态为 OffShelf 时，排除“沽清”以保持前台“下架”口径。
+            query = query.Where(x => !x.SoldoutMode.HasValue);
+        }
+
+        var sorted = ApplySearchSort(query, filter.SortBy, filter.SortDescending);
+        var total = await sorted.CountAsync(cancellationToken);
+        var items = await sorted
+            .Skip((page - 1) * pageSize)
+            .Take(pageSize)
+            .ToListAsync(cancellationToken);
+
+        return (items, total);
+    }
+
+    private static IOrderedQueryable<Product> ApplySearchSort(
+        IQueryable<Product> query,
+        string? sortBy,
+        bool sortDescending)
+    {
+        return sortBy?.ToLowerInvariant() switch
+        {
+            "name" => sortDescending
+                ? query.OrderByDescending(x => x.Name).ThenByDescending(x => x.Id)
+                : query.OrderBy(x => x.Name).ThenBy(x => x.Id),
+            "price" => sortDescending
+                ? query.OrderByDescending(x => x.Price).ThenByDescending(x => x.Id)
+                : query.OrderBy(x => x.Price).ThenBy(x => x.Id),
+            "status" => sortDescending
+                ? query.OrderByDescending(x => x.Status).ThenByDescending(x => x.Id)
+                : query.OrderBy(x => x.Status).ThenBy(x => x.Id),
+            _ => sortDescending
+                ? query.OrderByDescending(x => x.CreatedAt).ThenByDescending(x => x.Id)
+                : query.OrderBy(x => x.CreatedAt).ThenBy(x => x.Id)
+        };
+    }
+
     /// <inheritdoc />
     public async Task<IReadOnlyList<ProductCategory>> GetCategoriesAsync(long tenantId, CancellationToken cancellationToken = default)
     {