feat(CS): weekly auto-schedule (day-of-week + UTC time), persisted, /csschedule GM cmd

The siege can now auto-open registration on scheduled days/time instead of only
manual /csphase. Schedule is context-owned state (like owner), persisted across
restarts via the same config-JSON path. New GM command /csschedule sets/views/clears
it (e.g. /csschedule Sunday 20:00, UTC). +2 unit tests (11 total).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

src/GameLogic/CastleSiege/CastleSiegeConfiguration.cs

@@ -48,6 +48,12 @@ public class CastleSiegeConfiguration
     /// <summary>Gets or sets the persisted registered guild names for the current cycle.</summary>
     public IList<string> PersistedRegisteredGuilds { get; set; } = new List<string>();
 
+    /// <summary>Gets or sets the persisted auto-schedule days of week (empty = manual start only).</summary>
+    public IList<DayOfWeek> PersistedScheduleDays { get; set; } = new List<DayOfWeek>();
+
+    /// <summary>Gets or sets the persisted auto-schedule UTC time of day, or null if unscheduled.</summary>
+    public TimeOnly? PersistedScheduleTime { get; set; }
+
     /// <summary>
     /// Returns true if <paramref name="now"/> falls within a 5-second window of any configured
     /// registration-open time.

src/GameLogic/CastleSiege/CastleSiegeContext.cs

@@ -23,6 +23,8 @@ public class CastleSiegeContext
     private string? _occupier;
     private int _defensesRemaining;
     private bool _dirty;
+    private List<DayOfWeek> _scheduleDays = new();
+    private TimeOnly? _scheduleTime;
 
     /// <summary>Initializes a new instance of the <see cref="CastleSiegeContext"/> class.</summary>
     /// <param name="configuration">The cycle timing configuration.</param>
@@ -56,6 +58,12 @@ public class CastleSiegeContext
     /// <summary>Gets the guild names registered for the current cycle.</summary>
     public IReadOnlyList<string> RegisteredGuilds => this._registeredGuilds;
 
+    /// <summary>Gets the days of week the siege auto-opens registration (empty = manual start only).</summary>
+    public IReadOnlyList<DayOfWeek> ScheduleDays => this._scheduleDays;
+
+    /// <summary>Gets the UTC time of day registration auto-opens on scheduled days, or null if unscheduled.</summary>
+    public TimeOnly? ScheduleTime => this._scheduleTime;
+
     /// <summary>Advances the state machine based on the current time.</summary>
     /// <param name="now">The current UTC time.</param>
     public ValueTask TickAsync(DateTime now)
@@ -63,7 +71,7 @@ public class CastleSiegeContext
         switch (this.Phase)
         {
             case CastleSiegePhase.Ownership:
-                if (this.Configuration.IsRegistrationOpenTime(now))
+                if (this.ShouldOpenRegistration(now))
                 {
                     return this.ForceStartRegistrationAsync(now);
                 }
@@ -150,6 +158,41 @@ public class CastleSiegeContext
         this._dirty = true;
     }
 
+    /// <summary>
+    /// Sets the weekly auto-schedule (days of week + UTC time) and marks the state dirty for persistence.
+    /// Empty days disables auto-start (manual only).
+    /// </summary>
+    /// <param name="days">The days of week registration should auto-open.</param>
+    /// <param name="time">The UTC time of day registration should auto-open, or null to disable.</param>
+    public void SetSchedule(IEnumerable<DayOfWeek> days, TimeOnly? time)
+    {
+        this._scheduleDays = days.Distinct().OrderBy(d => d).ToList();
+        this._scheduleTime = this._scheduleDays.Count > 0 ? time : null;
+        this._dirty = true;
+    }
+
+    /// <summary>
+    /// Returns whether registration should auto-open now: a scheduled day matches and the current UTC time
+    /// falls within a 5-second window at/after the scheduled time. Only meaningful in the ownership phase.
+    /// </summary>
+    /// <param name="nowUtc">The current UTC time.</param>
+    public bool ShouldOpenRegistration(DateTime nowUtc)
+    {
+        if (this._scheduleTime is not { } scheduleTime || this._scheduleDays.Count == 0)
+        {
+            return false;
+        }
+
+        if (!this._scheduleDays.Contains(nowUtc.DayOfWeek))
+        {
+            return false;
+        }
+
+        var nowTime = TimeOnly.FromDateTime(nowUtc);
+        var windowEnd = scheduleTime.Add(TimeSpan.FromSeconds(5));
+        return scheduleTime <= nowTime && nowTime <= windowEnd;
+    }
+
     /// <summary>
     /// Returns whether the persistable state changed since the last call, resetting the flag.
     /// Called each tick by the plugin to decide whether to write state to the database.
@@ -169,7 +212,9 @@ public class CastleSiegeContext
     /// <param name="phase">The persisted phase.</param>
     /// <param name="phaseStartedUtc">When the persisted phase started (UTC), or null to keep the default.</param>
     /// <param name="registeredGuilds">The persisted registered guild names, or null.</param>
-    public void RestoreState(string? owner, CastleSiegePhase phase, DateTime? phaseStartedUtc, IEnumerable<string>? registeredGuilds)
+    /// <param name="scheduleDays">The persisted auto-schedule days of week, or null.</param>
+    /// <param name="scheduleTime">The persisted auto-schedule UTC time, or null.</param>
+    public void RestoreState(string? owner, CastleSiegePhase phase, DateTime? phaseStartedUtc, IEnumerable<string>? registeredGuilds, IEnumerable<DayOfWeek>? scheduleDays, TimeOnly? scheduleTime)
     {
         this.OwnerGuildName = owner;
         this.Phase = phase;
@@ -180,6 +225,8 @@ public class CastleSiegeContext
             this._registeredGuilds.AddRange(registeredGuilds);
         }
 
+        this._scheduleDays = scheduleDays?.Distinct().OrderBy(d => d).ToList() ?? new List<DayOfWeek>();
+        this._scheduleTime = this._scheduleDays.Count > 0 ? scheduleTime : null;
         this._dirty = false;
     }
 

src/GameLogic/PlugIns/ChatCommands/CastleSiegeScheduleChatCommandPlugIn.cs

@@ -0,0 +1,101 @@
+// <copyright file="CastleSiegeScheduleChatCommandPlugIn.cs" company="MUnique">
+// Licensed under the MIT License. See LICENSE file in the project root for full license information.
+// </copyright>
+
+namespace MUnique.OpenMU.GameLogic.PlugIns.ChatCommands;
+
+using System.Globalization;
+using System.Linq;
+using System.Runtime.InteropServices;
+using MUnique.OpenMU.GameLogic.CastleSiege;
+using MUnique.OpenMU.GameLogic.PlugIns.PeriodicTasks;
+using MUnique.OpenMU.GameLogic.Views;
+using MUnique.OpenMU.Interfaces;
+using MUnique.OpenMU.PlugIns;
+
+/// <summary>
+/// Sets the Castle Siege weekly auto-schedule. GM only. Times are UTC.
+/// Usage: <c>/csschedule</c> (show) | <c>/csschedule Sunday 20:00</c> | <c>/csschedule Sunday,Wednesday 20:00</c> | <c>/csschedule clear</c>.
+/// </summary>
+[Guid("A1B2C3D4-0006-4E5F-9A0B-CA5710000006")]
+[PlugIn]
+[Display(Name = "Castle Siege Schedule", Description = "GM command: /csschedule [<days> <HH:mm UTC> | clear]")]
+[ChatCommandHelp(Command, CharacterStatus.GameMaster)]
+public class CastleSiegeScheduleChatCommandPlugIn : IChatCommandPlugIn
+{
+    private const string Command = "/csschedule";
+
+    /// <inheritdoc />
+    public string Key => Command;
+
+    /// <inheritdoc/>
+    public CharacterStatus MinCharacterStatusRequirement => CharacterStatus.GameMaster;
+
+    /// <inheritdoc />
+    public async ValueTask HandleCommandAsync(Player player, string command)
+    {
+        var context = CastleSiegeEventPlugIn.TryGetContext(player.GameContext);
+        if (context is null)
+        {
+            await ShowAsync(player, "Castle Siege plugin not active.").ConfigureAwait(false);
+            return;
+        }
+
+        var parts = command.Split(' ', StringSplitOptions.RemoveEmptyEntries);
+
+        // "/csschedule" -> show current schedule.
+        if (parts.Length == 1)
+        {
+            await ShowAsync(player, Describe(context)).ConfigureAwait(false);
+            return;
+        }
+
+        // "/csschedule clear" -> disable auto-start.
+        if (parts.Length == 2 && string.Equals(parts[1], "clear", StringComparison.OrdinalIgnoreCase))
+        {
+            context.SetSchedule(Array.Empty<DayOfWeek>(), null);
+            await ShowAsync(player, "Castle Siege auto-schedule cleared (manual start only).").ConfigureAwait(false);
+            return;
+        }
+
+        if (parts.Length < 3)
+        {
+            await ShowAsync(player, "Usage: /csschedule <day[,day...]> <HH:mm UTC>  |  /csschedule clear").ConfigureAwait(false);
+            return;
+        }
+
+        var days = new List<DayOfWeek>();
+        foreach (var token in parts[1].Split(',', StringSplitOptions.RemoveEmptyEntries))
+        {
+            if (!Enum.TryParse<DayOfWeek>(token, true, out var day))
+            {
+                await ShowAsync(player, $"Unknown day '{token}'. Use e.g. Sunday, Monday, Tuesday...").ConfigureAwait(false);
+                return;
+            }
+
+            days.Add(day);
+        }
+
+        if (!TimeOnly.TryParse(parts[2], CultureInfo.InvariantCulture, out var time))
+        {
+            await ShowAsync(player, $"Invalid time '{parts[2]}'. Use 24h HH:mm (UTC).").ConfigureAwait(false);
+            return;
+        }
+
+        context.SetSchedule(days, time);
+        await ShowAsync(player, $"{Describe(context)} Server UTC now: {DateTime.UtcNow:ddd HH:mm}.").ConfigureAwait(false);
+    }
+
+    private static string Describe(CastleSiegeContext context)
+    {
+        if (context.ScheduleTime is not { } time || context.ScheduleDays.Count == 0)
+        {
+            return "Castle Siege auto-schedule: (none). Set with /csschedule <days> <HH:mm UTC>.";
+        }
+
+        return $"Castle Siege auto-schedule: {string.Join(",", context.ScheduleDays)} at {time:HH:mm} UTC.";
+    }
+
+    private static ValueTask ShowAsync(Player player, string text)
+        => player.InvokeViewPlugInAsync<IShowMessagePlugIn>(p => p.ShowMessageAsync(text, MessageType.BlueNormal));
+}

src/GameLogic/PlugIns/PeriodicTasks/CastleSiegeEventPlugIn.cs

@@ -75,7 +75,7 @@ public sealed class CastleSiegeEventPlugIn : IPeriodicTaskPlugIn, ISupportCustom
 
             // Restore state persisted before the last restart (owner/phase/registrations) BEFORE subscribing,
             // so restoring doesn't announce phases or re-spawn defenses.
-            created.RestoreState(config.PersistedOwnerGuildName, config.PersistedPhase, config.PersistedPhaseStartedUtc, config.PersistedRegisteredGuilds);
+            created.RestoreState(config.PersistedOwnerGuildName, config.PersistedPhase, config.PersistedPhaseStartedUtc, config.PersistedRegisteredGuilds, config.PersistedScheduleDays, config.PersistedScheduleTime);
 
             // Announce phase changes to the whole server and, when the siege begins, warp registered members.
             created.PhaseChanged += phase => _ = OnPhaseChangedAsync(gc, created, phase);
@@ -150,6 +150,8 @@ public sealed class CastleSiegeEventPlugIn : IPeriodicTaskPlugIn, ISupportCustom
             config.PersistedPhase = context.Phase;
             config.PersistedPhaseStartedUtc = context.PhaseStartedUtc;
             config.PersistedRegisteredGuilds = context.RegisteredGuilds.ToList();
+            config.PersistedScheduleDays = context.ScheduleDays.ToList();
+            config.PersistedScheduleTime = context.ScheduleTime;
 
             // Find our plugin-configuration row via the in-memory config graph to get its id.
             var pluginTypeId = typeof(CastleSiegeEventPlugIn).GUID;