DreamCard can Enter

GameServer/Server/CallGS/Handlers/DreamCard/DreamCard_CheckOpen.cs

@@ -0,0 +1,59 @@
+using MikuSB.Data;
+using MikuSB.Data.Excel;
+using System.Globalization;
+using System.Text.Json.Nodes;
+
+namespace MikuSB.GameServer.Server.CallGS.Handlers.DreamCard;
+
+[CallGSApi("DreamCard_CheckOpen")]
+public class DreamCard_CheckOpen : ICallGSHandler
+{
+    public async Task Handle(Connection connection, string param, ushort seqNo)
+    {
+        var now = DateTime.Now;
+        var ids = GameData.DreamCardActivityData.Values
+            .Where(x => IsOpen(x, now))
+            .OrderBy(x => x.ID)
+            .Select(x => JsonValue.Create(x.ID))
+            .ToArray();
+
+        var response = new JsonObject
+        {
+            ["tbID"] = new JsonArray(ids)
+        };
+
+        await CallGSRouter.SendScript(connection, "DreamCard_CheckOpen", response.ToJsonString());
+    }
+
+    private static bool IsOpen(DreamCardActivityExcel config, DateTime now)
+    {
+        var start = ParseConfigTime(config.StartTime);
+        if (!start.HasValue || start > now)
+            return false;
+
+        var end = ParseConfigTime(config.EndTime);
+        if (end.HasValue && now >= end.Value)
+            return false;
+
+        return string.IsNullOrWhiteSpace(config.Condition);
+    }
+
+    private static DateTime? ParseConfigTime(string? raw)
+    {
+        if (string.IsNullOrWhiteSpace(raw))
+            return null;
+
+        var normalized = raw.Trim().Trim('[', ']');
+        if (normalized.Length != 12)
+            return null;
+
+        return DateTime.TryParseExact(
+            normalized,
+            "yyyyMMddHHmm",
+            CultureInfo.InvariantCulture,
+            DateTimeStyles.None,
+            out var value)
+            ? value
+            : null;
+    }
+}