feat(CS-P1): Castle Siege phase state machine (in-memory, time-injected) + tests

src/GameLogic/CastleSiege/CastleSiegeConfiguration.cs

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+// <copyright file="CastleSiegeConfiguration.cs" company="MUnique">
+// Licensed under the MIT License. See LICENSE file in the project root for full license information.
+// </copyright>
+
+namespace MUnique.OpenMU.GameLogic.CastleSiege;
+
+/// <summary>
+/// Configuration for the Castle Siege cycle timings.
+/// Rides on the plugin custom-configuration system (no dedicated database table in P1).
+/// </summary>
+public class CastleSiegeConfiguration
+{
+    /// <summary>
+    /// Gets or sets the times of day at which a new cycle opens registration.
+    /// Empty by default; admins start cycles manually via chat command in P1.
+    /// </summary>
+    public IList<TimeOnly> RegistrationOpenTimes { get; set; } = new List<TimeOnly>();
+
+    /// <summary>Gets or sets how long the registration phase lasts.</summary>
+    public TimeSpan RegistrationDuration { get; set; } = TimeSpan.FromMinutes(5);
+
+    /// <summary>Gets or sets how long the preparation phase lasts.</summary>
+    public TimeSpan PreparationDuration { get; set; } = TimeSpan.FromMinutes(2);
+
+    /// <summary>Gets or sets how long the siege phase lasts.</summary>
+    public TimeSpan SiegeDuration { get; set; } = TimeSpan.FromMinutes(10);
+
+    /// <summary>
+    /// Returns true if <paramref name="now"/> falls within a 5-second window of any configured
+    /// registration-open time.
+    /// </summary>
+    /// <param name="now">The current UTC time.</param>
+    public bool IsRegistrationOpenTime(DateTime now)
+    {
+        if (this.RegistrationOpenTimes.Count == 0)
+        {
+            return false;
+        }
+
+        var nowTime = TimeOnly.FromDateTime(now);
+        var earlier = nowTime.Add(TimeSpan.FromSeconds(-5));
+        return this.RegistrationOpenTimes.Any(p => p.IsBetween(earlier, nowTime));
+    }
+}

src/GameLogic/CastleSiege/CastleSiegeContext.cs

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+// <copyright file="CastleSiegeContext.cs" company="MUnique">
+// Licensed under the MIT License. See LICENSE file in the project root for full license information.
+// </copyright>
+
+namespace MUnique.OpenMU.GameLogic.CastleSiege;
+
+/// <summary>
+/// In-memory Castle Siege phase state machine (P1 skeleton: no battle/persistence).
+/// Time is injected via method parameters so it can be tested deterministically.
+/// </summary>
+public class CastleSiegeContext
+{
+    private readonly List<string> _registeredGuilds = new();
+    private DateTime _phaseStartedUtc;
+
+    /// <summary>Initializes a new instance of the <see cref="CastleSiegeContext"/> class.</summary>
+    /// <param name="configuration">The cycle timing configuration.</param>
+    public CastleSiegeContext(CastleSiegeConfiguration configuration)
+    {
+        this.Configuration = configuration;
+        this.Phase = CastleSiegePhase.Ownership;
+    }
+
+    /// <summary>Raised after the phase changes. Argument is the new phase.</summary>
+    public event Action<CastleSiegePhase>? PhaseChanged;
+
+    /// <summary>Gets the configuration.</summary>
+    public CastleSiegeConfiguration Configuration { get; }
+
+    /// <summary>Gets the current phase.</summary>
+    public CastleSiegePhase Phase { get; private set; }
+
+    /// <summary>Gets the current owner guild name, or null if unowned.</summary>
+    public string? OwnerGuildName { get; private set; }
+
+    /// <summary>Gets the guild names registered for the current cycle.</summary>
+    public IReadOnlyList<string> RegisteredGuilds => this._registeredGuilds;
+
+    /// <summary>Advances the state machine based on the current time.</summary>
+    /// <param name="now">The current UTC time.</param>
+    public ValueTask TickAsync(DateTime now)
+    {
+        switch (this.Phase)
+        {
+            case CastleSiegePhase.Ownership:
+                if (this.Configuration.IsRegistrationOpenTime(now))
+                {
+                    return this.ForceStartRegistrationAsync(now);
+                }
+
+                break;
+            case CastleSiegePhase.Registration:
+                if (now >= this._phaseStartedUtc + this.Configuration.RegistrationDuration)
+                {
+                    return this.TransitionAsync(CastleSiegePhase.Preparation, now);
+                }
+
+                break;
+            case CastleSiegePhase.Preparation:
+                if (now >= this._phaseStartedUtc + this.Configuration.PreparationDuration)
+                {
+                    return this.TransitionAsync(CastleSiegePhase.Siege, now);
+                }
+
+                break;
+            case CastleSiegePhase.Siege:
+                if (now >= this._phaseStartedUtc + this.Configuration.SiegeDuration)
+                {
+                    return this.TransitionAsync(CastleSiegePhase.Settlement, now);
+                }
+
+                break;
+            case CastleSiegePhase.Settlement:
+                // P1: no battle -> no winner determination yet. Settle immediately back to ownership.
+                return this.TransitionAsync(CastleSiegePhase.Ownership, now);
+            default:
+                break;
+        }
+
+        return ValueTask.CompletedTask;
+    }
+
+    /// <summary>Admin: forces the cycle into registration now (from any phase).</summary>
+    /// <param name="now">The current UTC time.</param>
+    public ValueTask ForceStartRegistrationAsync(DateTime now)
+    {
+        this._registeredGuilds.Clear();
+        return this.TransitionAsync(CastleSiegePhase.Registration, now);
+    }
+
+    /// <summary>Admin: forces a specific phase now.</summary>
+    /// <param name="phase">The target phase.</param>
+    /// <param name="now">The current UTC time.</param>
+    public ValueTask ForcePhaseAsync(CastleSiegePhase phase, DateTime now)
+        => this.TransitionAsync(phase, now);
+
+    /// <summary>Admin: resets to the ownership (resting) phase and clears registrations.</summary>
+    /// <param name="now">The current UTC time.</param>
+    public ValueTask ResetAsync(DateTime now)
+    {
+        this._registeredGuilds.Clear();
+        return this.TransitionAsync(CastleSiegePhase.Ownership, now);
+    }
+
+    /// <summary>Registers a guild (by name) for the current cycle. No-op outside registration.</summary>
+    /// <param name="guildName">The guild name.</param>
+    public void RegisterGuild(string guildName)
+    {
+        if (this.Phase == CastleSiegePhase.Registration
+            && !this._registeredGuilds.Contains(guildName))
+        {
+            this._registeredGuilds.Add(guildName);
+        }
+    }
+
+    /// <summary>Admin: sets (or clears) the current owner guild name.</summary>
+    /// <param name="guildName">The owner guild name, or null to clear.</param>
+    public void SetOwner(string? guildName) => this.OwnerGuildName = guildName;
+
+    /// <summary>Returns a human-readable status summary for admin display.</summary>
+    public string GetStatusText()
+        => $"CS phase={this.Phase}, owner={this.OwnerGuildName ?? "(none)"}, "
+           + $"registered={this._registeredGuilds.Count} [{string.Join(", ", this._registeredGuilds)}]";
+
+    private ValueTask TransitionAsync(CastleSiegePhase phase, DateTime now)
+    {
+        this.Phase = phase;
+        this._phaseStartedUtc = now;
+        this.PhaseChanged?.Invoke(phase);
+        return ValueTask.CompletedTask;
+    }
+}

src/GameLogic/CastleSiege/CastleSiegePhase.cs

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+// <copyright file="CastleSiegePhase.cs" company="MUnique">
+// Licensed under the MIT License. See LICENSE file in the project root for full license information.
+// </copyright>
+
+namespace MUnique.OpenMU.GameLogic.CastleSiege;
+
+/// <summary>
+/// The phases of a Castle Siege cycle.
+/// </summary>
+public enum CastleSiegePhase
+{
+    /// <summary>Resting phase: castle is (un)owned, waiting for the next registration window.</summary>
+    Ownership,
+
+    /// <summary>Guilds can register to attack.</summary>
+    Registration,
+
+    /// <summary>Registration closed; defenders prepare before the siege starts.</summary>
+    Preparation,
+
+    /// <summary>The siege battle is running.</summary>
+    Siege,
+
+    /// <summary>Siege ended; determining the new owner.</summary>
+    Settlement,
+}

tests/MUnique.OpenMU.Tests/CastleSiege/CastleSiegeContextTest.cs

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+// <copyright file="CastleSiegeContextTest.cs" company="MUnique">
+// Licensed under the MIT License. See LICENSE file in the project root for full license information.
+// </copyright>
+
+namespace MUnique.OpenMU.Tests.CastleSiege;
+
+using MUnique.OpenMU.GameLogic.CastleSiege;
+
+/// <summary>
+/// Tests for the Castle Siege phase state machine (time-driven, injected clock).
+/// </summary>
+[TestFixture]
+public class CastleSiegeContextTest
+{
+    private static readonly DateTime T0 = new(2026, 1, 1, 12, 0, 0, DateTimeKind.Utc);
+
+    /// <summary>Tests that a fresh context starts in the ownership (resting) phase.</summary>
+    [Test]
+    public void StartsInOwnership()
+    {
+        var ctx = new CastleSiegeContext(Config());
+        Assert.That(ctx.Phase, Is.EqualTo(CastleSiegePhase.Ownership));
+    }
+
+    /// <summary>Tests that force-starting moves the state machine into registration.</summary>
+    [Test]
+    public async Task ForceStartMovesToRegistrationAsync()
+    {
+        var ctx = new CastleSiegeContext(Config());
+        await ctx.ForceStartRegistrationAsync(T0);
+        Assert.That(ctx.Phase, Is.EqualTo(CastleSiegePhase.Registration));
+    }
+
+    /// <summary>Tests that registration advances to preparation once its duration elapses.</summary>
+    [Test]
+    public async Task RegistrationAdvancesToPreparationAfterDurationAsync()
+    {
+        var ctx = new CastleSiegeContext(Config());
+        await ctx.ForceStartRegistrationAsync(T0);
+        await ctx.TickAsync(T0.AddMinutes(4)); // still within registration
+        Assert.That(ctx.Phase, Is.EqualTo(CastleSiegePhase.Registration));
+        await ctx.TickAsync(T0.AddMinutes(5)); // registration duration elapsed
+        Assert.That(ctx.Phase, Is.EqualTo(CastleSiegePhase.Preparation));
+    }
+
+    /// <summary>Tests a full cycle: registration -> preparation -> siege -> settlement -> ownership.</summary>
+    [Test]
+    public async Task FullCycleReturnsToOwnershipAsync()
+    {
+        var ctx = new CastleSiegeContext(Config());
+        await ctx.ForceStartRegistrationAsync(T0);
+        await ctx.TickAsync(T0.AddMinutes(5));  // -> Preparation
+        await ctx.TickAsync(T0.AddMinutes(7));  // +2 prep -> Siege
+        Assert.That(ctx.Phase, Is.EqualTo(CastleSiegePhase.Siege));
+        await ctx.TickAsync(T0.AddMinutes(17)); // +10 siege -> Settlement
+        await ctx.TickAsync(T0.AddMinutes(17)); // Settlement -> Ownership
+        Assert.That(ctx.Phase, Is.EqualTo(CastleSiegePhase.Ownership));
+    }
+
+    /// <summary>Tests that guilds can be registered (by name) during the registration phase.</summary>
+    [Test]
+    public async Task RegisterGuildCollectsNamesDuringRegistrationAsync()
+    {
+        var ctx = new CastleSiegeContext(Config());
+        await ctx.ForceStartRegistrationAsync(T0);
+        ctx.RegisterGuild("Attackers");
+        Assert.That(ctx.RegisteredGuilds, Does.Contain("Attackers"));
+    }
+
+    private static CastleSiegeConfiguration Config() => new()
+    {
+        RegistrationDuration = TimeSpan.FromMinutes(5),
+        PreparationDuration = TimeSpan.FromMinutes(2),
+        SiegeDuration = TimeSpan.FromMinutes(10),
+    };
+}