DreamCard can Enter

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

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+using MikuSB.Data;
+using MikuSB.Util;
+using System.Globalization;
+using System.Text.Json;
+using System.Text.Json.Nodes;
+using System.Text.Json.Serialization;
+
+namespace MikuSB.GameServer.Server.CallGS.Handlers.DreamCard;
+
+[CallGSApi("DreamCard_EnterLevel")]
+public class DreamCard_EnterLevel : ICallGSHandler
+{
+    private static readonly Random Random = new();
+    private static readonly Lazy<DreamCardLevelIndex?> LevelIndex = new(LoadLevelIndex);
+
+    public async Task Handle(Connection connection, string param, ushort seqNo)
+    {
+        var req = JsonSerializer.Deserialize<DreamCardEnterLevelParam>(param);
+        if (req == null || req.LevelId <= 0 || req.Diff <= 0 || req.Type is < 1 or > 3)
+        {
+            await CallGSRouter.SendScript(connection, "DreamCard_EnterLevel", "null");
+            return;
+        }
+
+        var now = DateTime.Now;
+        if (!IsAllowed(req, now))
+        {
+            await CallGSRouter.SendScript(connection, "DreamCard_EnterLevel", "null");
+            return;
+        }
+
+        var response = new JsonObject
+        {
+            ["nSeed"] = Random.Next(1, 1_000_000_000),
+            ["nID"] = req.LevelId,
+            ["nDiff"] = req.Diff,
+            ["nType"] = req.Type
+        };
+
+        await CallGSRouter.SendScript(connection, "DreamCard_EnterLevel", response.ToJsonString());
+    }
+
+    private static bool IsAllowed(DreamCardEnterLevelParam req, DateTime now)
+    {
+        var index = LevelIndex.Value;
+        if (index == null)
+            return true;
+
+        return req.Type switch
+        {
+            1 => index.OpenOrdinaryLevelIds(now).Contains((uint)req.LevelId),
+            2 => index.IsChallengeOpen((uint)req.LevelId, now),
+            3 => index.IsEndlessOpen((uint)req.LevelId, now),
+            _ => false
+        };
+    }
+
+    private static DreamCardLevelIndex? LoadLevelIndex()
+    {
+        try
+        {
+            var resourceRoot = ConfigManager.Config.Path.ResourcePath;
+            var dreamCardRoot = Path.Combine(resourceRoot, "dlc", "DreamCard");
+
+            var ordinaryLevels = LoadJson<List<DreamCardOrdinaryLevelEntry>>(Path.Combine(dreamCardRoot, "levellist.json")) ?? [];
+            var challengeLevels = LoadJson<List<DreamCardChallengeLevelEntry>>(Path.Combine(dreamCardRoot, "challenge.json")) ?? [];
+            var endlessLevels = LoadJson<List<DreamCardEndlessLevelEntry>>(Path.Combine(dreamCardRoot, "endless.json")) ?? [];
+
+            return new DreamCardLevelIndex(ordinaryLevels, challengeLevels, endlessLevels);
+        }
+        catch
+        {
+            return null;
+        }
+    }
+
+    private static T? LoadJson<T>(string path)
+    {
+        if (!File.Exists(path))
+            return default;
+
+        return JsonSerializer.Deserialize<T>(File.ReadAllText(path));
+    }
+}
+
+internal sealed class DreamCardEnterLevelParam
+{
+    [JsonPropertyName("nID")]
+    public int LevelId { get; set; }
+
+    [JsonPropertyName("nDiff")]
+    public int Diff { get; set; }
+
+    [JsonPropertyName("nType")]
+    public int Type { get; set; }
+
+    [JsonPropertyName("nRoleId")]
+    public int RoleId { get; set; }
+}
+
+internal sealed class DreamCardLevelIndex
+{
+    private readonly HashSet<uint> ordinaryLevelIds;
+    private readonly Dictionary<uint, DreamCardChallengeLevelEntry> challengeLevels;
+    private readonly Dictionary<uint, DreamCardEndlessLevelEntry> endlessLevels;
+
+    public DreamCardLevelIndex(
+        IEnumerable<DreamCardOrdinaryLevelEntry> ordinaryLevels,
+        IEnumerable<DreamCardChallengeLevelEntry> challengeLevels,
+        IEnumerable<DreamCardEndlessLevelEntry> endlessLevels)
+    {
+        ordinaryLevelIds = ordinaryLevels
+            .Where(x => x.LevelListId > 0)
+            .Select(x => x.LevelListId)
+            .ToHashSet();
+
+        this.challengeLevels = challengeLevels
+            .Where(x => x.ChallengeId > 0)
+            .GroupBy(x => x.ChallengeId)
+            .ToDictionary(x => x.Key, x => x.First());
+
+        this.endlessLevels = endlessLevels
+            .Where(x => x.EndlessId > 0)
+            .GroupBy(x => x.EndlessId)
+            .ToDictionary(x => x.Key, x => x.First());
+    }
+
+    public HashSet<uint> OpenOrdinaryLevelIds(DateTime now)
+    {
+        var ids = new HashSet<uint>();
+        foreach (var activity in GameData.DreamCardActivityData.Values)
+        {
+            if (!IsActivityOpen(activity, now))
+                continue;
+
+            foreach (var id in activity.LevelListID)
+            {
+                if (ordinaryLevelIds.Contains(id))
+                    ids.Add(id);
+            }
+        }
+
+        return ids;
+    }
+
+    public bool IsChallengeOpen(uint id, DateTime now)
+    {
+        return challengeLevels.TryGetValue(id, out var entry) && IsWithin(entry.StartTime, entry.EndTime, now);
+    }
+
+    public bool IsEndlessOpen(uint id, DateTime now)
+    {
+        return endlessLevels.TryGetValue(id, out var entry) && IsWithin(entry.StartTime, entry.EndTime, now);
+    }
+
+    private static bool IsActivityOpen(Data.Excel.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 bool IsWithin(string? startRaw, string? endRaw, DateTime now)
+    {
+        var start = ParseConfigTime(startRaw);
+        if (!start.HasValue || now < start.Value)
+            return false;
+
+        var end = ParseConfigTime(endRaw);
+        return !end.HasValue || now < end.Value;
+    }
+
+    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;
+    }
+}
+
+internal sealed class DreamCardOrdinaryLevelEntry
+{
+    [JsonPropertyName("LevelListID")]
+    public uint LevelListId { get; set; }
+}
+
+internal sealed class DreamCardChallengeLevelEntry
+{
+    [JsonPropertyName("ChallengeId")]
+    public uint ChallengeId { get; set; }
+
+    [JsonPropertyName("StartTime")]
+    public string StartTime { get; set; } = "";
+
+    [JsonPropertyName("EndTime")]
+    public string EndTime { get; set; } = "";
+}
+
+internal sealed class DreamCardEndlessLevelEntry
+{
+    [JsonPropertyName("EndlessID")]
+    public uint EndlessId { get; set; }
+
+    [JsonPropertyName("StartTime")]
+    public string StartTime { get; set; } = "";
+
+    [JsonPropertyName("EndTime")]
+    public string EndTime { get; set; } = "";
+}