Prebuilt deck purchasing and fixes

SVSim.EmulatedEntrypoint/Controllers/LeaderSkinController.cs

@@ -0,0 +1,64 @@
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.EntityFrameworkCore;
+using SVSim.Database;
+using SVSim.EmulatedEntrypoint.Models.Dtos.Requests.LeaderSkin;
+using SVSim.EmulatedEntrypoint.Models.Dtos.Responses.LeaderSkin;
+
+namespace SVSim.EmulatedEntrypoint.Controllers;
+
+/// <summary>
+/// /leader_skin/* — per-class "active leader skin" preference. The per-CLASS setting is the
+/// fallback used when a deck has <c>leader_skin_id == 0</c>; per-deck overrides go through
+/// /deck/update_leader_skin instead.
+/// </summary>
+[Route("leader_skin")]
+public class LeaderSkinController : SVSimController
+{
+    private readonly SVSimDbContext _db;
+
+    public LeaderSkinController(SVSimDbContext db)
+    {
+        _db = db;
+    }
+
+    [HttpPost("set")]
+    public async Task<ActionResult<LeaderSkinSetResponse>> Set(LeaderSkinSetRequest request)
+    {
+        if (!TryGetViewerId(out long viewerId)) return Unauthorized();
+
+        if (request.IsRandomLeaderSkin)
+        {
+            // Random-skin mode needs a per-viewer per-class shuffle pool, which we don't
+            // persist yet (ViewerClassData has no list field for it). Punt for now.
+            return StatusCode(StatusCodes.Status501NotImplemented,
+                new { error = "random_leader_skin_not_implemented" });
+        }
+
+        var viewer = await _db.Viewers
+            .Include(v => v.Classes).ThenInclude(c => c.Class)
+            .Include(v => v.Classes).ThenInclude(c => c.LeaderSkin)
+            .Include(v => v.LeaderSkins)
+            .FirstOrDefaultAsync(v => v.Id == viewerId);
+        if (viewer is null) return Unauthorized();
+
+        var classData = viewer.Classes.FirstOrDefault(c => c.Class.Id == request.ClassId);
+        if (classData is null) return BadRequest(new { error = "unknown_class" });
+
+        // Skin must (a) exist in the catalog, (b) match the target class, (c) be owned by the viewer.
+        var skin = await _db.LeaderSkins.FindAsync(request.LeaderSkinId);
+        if (skin is null) return BadRequest(new { error = "unknown_skin" });
+        if (skin.ClassId != request.ClassId) return BadRequest(new { error = "skin_class_mismatch" });
+        if (viewer.LeaderSkins.All(s => s.Id != skin.Id))
+            return BadRequest(new { error = "skin_not_owned" });
+
+        classData.LeaderSkin = skin;
+        await _db.SaveChangesAsync();
+
+        return new LeaderSkinSetResponse
+        {
+            IsRandomLeaderSkin = false,
+            LeaderSkinId = skin.Id,
+            LeaderSkinIdList = new(),
+        };
+    }
+}