Deck list work

SVSim.EmulatedEntrypoint/Controllers/PaymentController.cs

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+using System.Globalization;
+using Microsoft.AspNetCore.Mvc;
+using SVSim.Database.Models;
+using SVSim.Database.Repositories.Globals;
+using SVSim.EmulatedEntrypoint.Models.Dtos;
+using SVSim.EmulatedEntrypoint.Models.Dtos.Requests;
+
+namespace SVSim.EmulatedEntrypoint.Controllers;
+
+/// <summary>
+/// /payment_pc/* — Steam/PC store endpoints. Currently serves item_list (the storefront product
+/// catalog); purchase flows (/payment_pc/finish etc.) are not yet implemented.
+///
+/// Route is explicit because the URL prefix doesn't match the controller name pattern
+/// (SVSimController applies [Route("[controller]")] which would resolve to /payment).
+/// </summary>
+[Route("payment_pc")]
+public class PaymentController : SVSimController
+{
+    /// <summary>"yyyy-MM-dd HH:mm:ss" — prod's PHP datetime convention on the wire.</summary>
+    private const string WireDateFormat = "yyyy-MM-dd HH:mm:ss";
+
+    private readonly IGlobalsRepository _globalsRepository;
+
+    public PaymentController(IGlobalsRepository globalsRepository)
+    {
+        _globalsRepository = globalsRepository;
+    }
+
+    [HttpPost("item_list")]
+    public async Task<ActionResult<Dictionary<string, PaymentItemInfo>>> ItemList(PaymentItemListRequest request)
+    {
+        var items = await _globalsRepository.GetPaymentItems();
+        return items.ToDictionary(
+            row => row.StoreProductId.ToString(CultureInfo.InvariantCulture),
+            row => BuildPaymentItemInfo(row));
+    }
+
+    /// <summary>
+    /// Map a typed DB row to the all-strings wire shape prod uses. Typed columns let us query and
+    /// validate cleanly server-side; PHP-stringification happens here at the wire boundary.
+    /// </summary>
+    private static PaymentItemInfo BuildPaymentItemInfo(PaymentItemEntry row) => new()
+    {
+        RecordId = row.Id.ToString(CultureInfo.InvariantCulture),
+        Id = row.ProductId.ToString(CultureInfo.InvariantCulture),
+        StoreProductId = row.StoreProductId.ToString(CultureInfo.InvariantCulture),
+        Name = row.Name,
+        Text = row.Text,
+        // Prod price wire shape is e.g. "0.99" with up to 2 decimals. InvariantCulture renders the
+        // .NET decimal as "0.99" / "10.99" cleanly without trailing zeros from a scale of 4+.
+        Price = row.Price.ToString("0.##", CultureInfo.InvariantCulture),
+        ChargeCrystalNum = row.ChargeCrystalNum.ToString(CultureInfo.InvariantCulture),
+        FreeCrystalNum = row.FreeCrystalNum.ToString(CultureInfo.InvariantCulture),
+        PurchaseLimit = row.PurchaseLimit.ToString(CultureInfo.InvariantCulture),
+        SpecialShopFlag = row.SpecialShopFlag.ToString(CultureInfo.InvariantCulture),
+        ImageName = row.ImageName,
+        StartTime = row.StartTime.ToString(WireDateFormat, CultureInfo.InvariantCulture),
+        EndTime = row.EndTime.ToString(WireDateFormat, CultureInfo.InvariantCulture),
+        RemainingTime = row.RemainingTime.ToString(CultureInfo.InvariantCulture),
+        IsResaleProduct = row.IsResaleProduct.ToString(CultureInfo.InvariantCulture),
+        // Prod sends "" when no resale window is scheduled; otherwise the formatted date.
+        ResaleStartDate = row.ResaleStartDate is { } d
+            ? d.ToString(WireDateFormat, CultureInfo.InvariantCulture)
+            : string.Empty,
+        // TODO(payment-stub): per-viewer count of this product's purchases. Hardcoded to 0 until
+        // viewer-purchase tracking lands. Fresh viewers always see 0 in prod anyway.
+        PurchaseNumCurrent = 0,
+    };
+}