Practice/deck editing mostly there

SVSim.EmulatedEntrypoint/Controllers/ConfigController.cs

@@ -0,0 +1,31 @@
+using Microsoft.AspNetCore.Mvc;
+using SVSim.EmulatedEntrypoint.Models.Dtos.Common;
+using SVSim.EmulatedEntrypoint.Models.Dtos.Requests;
+
+namespace SVSim.EmulatedEntrypoint.Controllers;
+
+/// <summary>
+/// /config/* — viewer-scoped preference toggles. Fired by the client as fire-and-forget
+/// after the deck-builder save flow (and from settings screens). Currently acknowledge-only:
+/// UserConfig is stubbed in load/index + mypage/index until a viewer-config persistence
+/// layer lands. Mirrors the set_deck_redis precedent (no-op accept).
+/// </summary>
+public class ConfigController : SVSimController
+{
+    [HttpPost("update_foil_preferred")]
+    public ActionResult<EmptyResponse> UpdateFoilPreferred(ConfigUpdateFoilPreferredRequest request)
+    {
+        if (!TryGetViewerId(out long _)) return Unauthorized();
+        // TODO(viewer-config-persist): write request.IsFoilPreferred onto the viewer's config row
+        // and read it back in load/index + mypage/index instead of `new UserConfig()`.
+        return new EmptyResponse();
+    }
+
+    [HttpPost("update_prize_preferred")]
+    public ActionResult<EmptyResponse> UpdatePrizePreferred(ConfigUpdatePrizePreferredRequest request)
+    {
+        if (!TryGetViewerId(out long _)) return Unauthorized();
+        // TODO(viewer-config-persist): see UpdateFoilPreferred.
+        return new EmptyResponse();
+    }
+}

SVSim.EmulatedEntrypoint/Controllers/DeckController.cs

@@ -1,10 +1,12 @@
 using Microsoft.AspNetCore.Mvc;
 using Microsoft.EntityFrameworkCore;
+using Microsoft.Extensions.Options;
 using SVSim.Database;
 using SVSim.Database.Enums;
 using SVSim.Database.Models;
 using SVSim.Database.Repositories.Deck;
 using SVSim.Database.Repositories.Globals;
+using SVSim.EmulatedEntrypoint.Configuration;
 using SVSim.EmulatedEntrypoint.Constants;
 using SVSim.EmulatedEntrypoint.Extensions;
 using SVSim.EmulatedEntrypoint.Models.Dtos;
@@ -20,6 +22,7 @@ public class DeckController : SVSimController
     private readonly IDeckRepository _deckRepository;
     private readonly IGlobalsRepository _globalsRepository;
     private readonly SVSimDbContext _dbContext;
+    private readonly DeckOptions _deckOptions;
 
     private static readonly System.Text.Json.JsonSerializerOptions JsonbReadOptions = new()
     {
@@ -27,11 +30,32 @@ public class DeckController : SVSimController
         NumberHandling = System.Text.Json.Serialization.JsonNumberHandling.AllowReadingFromString,
     };
 
-    public DeckController(IDeckRepository deckRepository, IGlobalsRepository globalsRepository, SVSimDbContext dbContext)
+    public DeckController(IDeckRepository deckRepository, IGlobalsRepository globalsRepository, SVSimDbContext dbContext, IOptions<DeckOptions> deckOptions)
     {
         _deckRepository = deckRepository;
         _globalsRepository = globalsRepository;
         _dbContext = dbContext;
+        _deckOptions = deckOptions.Value;
+    }
+
+    /// <summary>
+    /// Pads a viewer's real deck list with empty-slot placeholders up to <see cref="DeckOptions.MaxDeckSlots"/>.
+    /// Required because the client's <c>DeckUI.DeckViewData.CreateDeckViewList</c> only renders
+    /// a "New Deck" tile when the response contains an entry whose <c>card_id_array</c> is empty —
+    /// without padding, the player cannot create additional decks once any exist.
+    /// </summary>
+    private List<UserDeck> PadEmptySlots(List<UserDeck> realDecks)
+    {
+        var taken = realDecks.Select(d => d.DeckNumber).ToHashSet();
+        var result = new List<UserDeck>(realDecks);
+        for (int slot = 1; slot <= _deckOptions.MaxDeckSlots; slot++)
+        {
+            if (!taken.Contains(slot))
+            {
+                result.Add(UserDeck.CreateEmptySlot(slot));
+            }
+        }
+        return result;
     }
 
     // Request deck_format fields arrive as wire ints (MessagePack-CSharp doesn't honor STJ
@@ -106,9 +130,9 @@ public class DeckController : SVSimController
             // for our profile; we mirror that omission and leave the nullable DTO fields unset.
             var formats = new[] { Format.Rotation, Format.Unlimited, Format.MyRotation };
             var byFormat = await _deckRepository.GetDecksByFormats(viewerId, formats);
-            response.UserDeckRotation = byFormat[Format.Rotation].Select(d => new UserDeck(d)).ToList();
-            response.UserDeckUnlimited = byFormat[Format.Unlimited].Select(d => new UserDeck(d)).ToList();
-            response.UserDeckMyRotation = byFormat[Format.MyRotation].Select(d => new UserDeck(d)).ToList();
+            response.UserDeckRotation = PadEmptySlots(byFormat[Format.Rotation].Select(d => new UserDeck(d)).ToList());
+            response.UserDeckUnlimited = PadEmptySlots(byFormat[Format.Unlimited].Select(d => new UserDeck(d)).ToList());
+            response.UserDeckMyRotation = PadEmptySlots(byFormat[Format.MyRotation].Select(d => new UserDeck(d)).ToList());
             // trial_deck_list is prod-emitted on /deck/info (All format) but omitted on /deck/my_list
             // (specific format). Empty array in the 2026-05-23 prod capture.
             response.TrialDeckList = new();
@@ -116,7 +140,7 @@ public class DeckController : SVSimController
         else
         {
             var decks = await _deckRepository.GetDecks(viewerId, requestFormat);
-            response.UserDeckList = decks.Select(d => new UserDeck(d)).ToList();
+            response.UserDeckList = PadEmptySlots(decks.Select(d => new UserDeck(d)).ToList());
         }
 
         return response;
@@ -163,7 +187,7 @@ public class DeckController : SVSimController
         var decks = await _deckRepository.GetDecks(viewerId, format);
         return new DeckUpdateResponse
         {
-            UserDeckList = decks.Select(d => new UserDeck(d)).ToList()
+            UserDeckList = PadEmptySlots(decks.Select(d => new UserDeck(d)).ToList())
         };
     }