// <copyright file="CastleSiegeEventPlugIn.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.PeriodicTasks;

using System.Collections.Concurrent;
using System.Runtime.InteropServices;
using MUnique.OpenMU.GameLogic.CastleSiege;
using MUnique.OpenMU.PlugIns;

/// <summary>
/// Drives the Castle Siege phase state machine: ticks it every second and carries its configuration.
/// State is per-<see cref="IGameContext"/> and kept in memory (P1: no persistence).
/// </summary>
[PlugIn]
[Display(Name = nameof(CastleSiegeEventPlugIn), Description = "Castle Siege event (P1 skeleton: phase state machine + scheduling).")]
[Guid("6E2C8B41-9A4D-4C2E-9E7B-1F2A3B4C5D60")]
public sealed class CastleSiegeEventPlugIn : IPeriodicTaskPlugIn, ISupportCustomConfiguration<CastleSiegeConfiguration>, ISupportDefaultCustomConfiguration
{
    private static readonly ConcurrentDictionary<IGameContext, CastleSiegeContext> Contexts = new();

    /// <inheritdoc />
    public CastleSiegeConfiguration? Configuration { get; set; }

    /// <summary>
    /// Gets the Castle Siege context for a game context, if the periodic tick has initialized it.
    /// </summary>
    /// <param name="gameContext">The game context.</param>
    /// <returns>The context, or <c>null</c> if not yet initialized.</returns>
    /// <remarks>Static so GM chat commands can reach the state machine without a plugin instance
    /// (<c>GetKnownPlugInsOf</c> returns Types, not instances). The tick runs every second, so the
    /// context exists within ~1s of server start.</remarks>
    public static CastleSiegeContext? TryGetContext(IGameContext gameContext)
        => Contexts.TryGetValue(gameContext, out var context) ? context : null;

    /// <inheritdoc />
    public object CreateDefaultConfig() => new CastleSiegeConfiguration();

    /// <inheritdoc />
    public async ValueTask ExecuteTaskAsync(GameContext gameContext)
    {
        var context = Contexts.GetOrAdd(gameContext, _ => new CastleSiegeContext(this.Configuration ?? new CastleSiegeConfiguration()));
        await context.TickAsync(DateTime.UtcNow).ConfigureAwait(false);
    }

    /// <inheritdoc />
    public void ForceStart()
    {
        // Force-start applies to every active game context's siege.
        foreach (var context in Contexts.Values)
        {
            _ = context.ForceStartRegistrationAsync(DateTime.UtcNow);
        }
    }
}