Prebuilt deck purchasing and fixes

SVSim.Database/Repositories/BuildDeck/BuildDeckRepository.cs

@@ -0,0 +1,67 @@
+using Microsoft.EntityFrameworkCore;
+using SVSim.Database.Models;
+
+namespace SVSim.Database.Repositories.BuildDeck;
+
+public class BuildDeckRepository : IBuildDeckRepository
+{
+    private readonly SVSimDbContext _db;
+    public BuildDeckRepository(SVSimDbContext db) { _db = db; }
+
+    public async Task<List<BuildDeckSeriesEntry>> GetEnabledCatalog(int addSeriesId)
+    {
+        var q = _db.BuildDeckSeries
+            .Include(s => s.SeriesRewards)
+            .Include(s => s.Products.Where(p => p.IsEnabled))
+                .ThenInclude(p => p.Cards)
+            .Include(s => s.Products.Where(p => p.IsEnabled))
+                .ThenInclude(p => p.Rewards)
+            .Where(s => s.IsEnabled)
+            .AsSplitQuery();
+
+        if (addSeriesId != 0)
+        {
+            q = q.Where(s => s.Id == addSeriesId);
+        }
+
+        var list = await q.ToListAsync();
+        list.Sort((a, b) => b.OrderIndex.CompareTo(a.OrderIndex));
+        return list;
+    }
+
+    public async Task<BuildDeckProductEntry?> GetProduct(int productId) =>
+        await _db.BuildDeckProducts
+            .Include(p => p.Cards)
+            .Include(p => p.Rewards)
+            .Include(p => p.Series).ThenInclude(s => s!.SeriesRewards)
+            .Include(p => p.Series).ThenInclude(s => s!.Products)
+            .AsSplitQuery()
+            .FirstOrDefaultAsync(p => p.Id == productId);
+
+    public async Task<Dictionary<int, ViewerBuildDeckProductPurchase>> GetPurchasesForViewer(long viewerId)
+    {
+        var viewer = await _db.Viewers
+            .Include(v => v.BuildDeckPurchases)
+            .FirstOrDefaultAsync(v => v.Id == viewerId);
+        return viewer?.BuildDeckPurchases.ToDictionary(p => p.ProductId) ?? new();
+    }
+
+    public async Task<int> IncrementPurchaseCount(long viewerId, int productId)
+    {
+        var viewer = await _db.Viewers
+            .Include(v => v.BuildDeckPurchases)
+            .FirstAsync(v => v.Id == viewerId);
+        var row = viewer.BuildDeckPurchases.FirstOrDefault(p => p.ProductId == productId);
+        if (row is null)
+        {
+            row = new ViewerBuildDeckProductPurchase { ProductId = productId, PurchaseCount = 1 };
+            viewer.BuildDeckPurchases.Add(row);
+        }
+        else
+        {
+            row.PurchaseCount += 1;
+        }
+        await _db.SaveChangesAsync();
+        return row.PurchaseCount;
+    }
+}

SVSim.Database/Repositories/BuildDeck/IBuildDeckRepository.cs

@@ -0,0 +1,29 @@
+using SVSim.Database.Models;
+
+namespace SVSim.Database.Repositories.BuildDeck;
+
+public interface IBuildDeckRepository
+{
+    /// <summary>
+    /// Load enabled series (filtered by addSeriesId when non-zero) with all owned children
+    /// for /build_deck/info. Series and per-series products are sorted by OrderIndex desc.
+    /// </summary>
+    Task<List<BuildDeckSeriesEntry>> GetEnabledCatalog(int addSeriesId);
+
+    /// <summary>
+    /// Load a single product (with Series + Cards + Rewards + Series.SeriesRewards) by id.
+    /// Returns null if absent. Used by /build_deck/buy and /build_deck/get_purchase_count.
+    /// </summary>
+    Task<BuildDeckProductEntry?> GetProduct(int productId);
+
+    /// <summary>
+    /// Per-viewer purchase counter snapshot. Key = product_id.
+    /// </summary>
+    Task<Dictionary<int, ViewerBuildDeckProductPurchase>> GetPurchasesForViewer(long viewerId);
+
+    /// <summary>
+    /// Increment the (ViewerId, ProductId) purchase counter by 1 (insert if absent).
+    /// Returns the new total.
+    /// </summary>
+    Task<int> IncrementPurchaseCount(long viewerId, int productId);
+}