namespace Aeshnidae.Invasions;

/// <summary>
/// Entry point ACE looks for (assembly "Aeshnidae.Invasions.dll" -> type
/// "Aeshnidae.Invasions.Mod").
///
/// Town invasions: on a timer, a town with players in it is warned, then attacked in
/// waves of retail monsters that march from the edge of town to its centre, ending with a
/// boss. Kill the boss inside the time limit and every player who damaged an invader earns
/// a bonus scaled to their level and a token; otherwise the invaders withdraw. /invasion.
/// </summary>
public class Mod : IHarmonyMod
{
    public static readonly string Name = typeof(Mod).Assembly.GetName().Name!;

    /// <summary>Harmony owner id. Unique per mod - it is what UnpatchAll targets.</summary>
    public static readonly string HarmonyId = $"mod.{Name.ToLowerInvariant()}";

    /// <summary>Folder this mod was loaded from, e.g. ~/ace/Mods/Aeshnidae.Invasions</summary>
    public static readonly string ModPath = Path.Combine(ModManager.ModPath, Name);

    public static ModContainer? Container => ModManager.GetModContainerByPath(ModPath);

    /// <summary>Live settings, re-read on enable and by /invasion-reload.</summary>
    public static Settings Settings { get; private set; } = new();

    private static Harmony? _harmony;
    private bool _disposed;

    public void Initialize()
    {
        Settings = Settings.Load(ModPath);
        Invasions.Initialize();

        _harmony = new Harmony(HarmonyId);

        // Pass the assembly explicitly: the parameterless overload walks the stack, and an
        // inlined Initialize() makes it land on ACE.Server and patch nothing.
        _harmony.PatchAllUncategorized(typeof(Mod).Assembly);

        ModManager.Log($"[{Name}] ready - {Settings.Towns.Count} town(s): {string.Join(", ", Settings.Towns.Select(t => $"{t.Name} [{t.WaveSet}]"))}; " +
                       $"enabled {Settings.Enabled}, timer {(Settings.AutoSchedule ? $"on, first at {Invasions.NextScheduled:HH:mm} UTC" : "off")}; " +
                       $"bonus {Settings.BonusPercentOfLevel:P0} of a level, token {(Settings.TokenWcid == 0 ? "none" : Settings.TokenWcid.ToString())}");
    }

    /// <summary>/invasion-reload: the settings, not the patches. A running invasion keeps its town and waves.</summary>
    public static void ReloadSettings()
    {
        var wasScheduled = Settings.AutoSchedule;
        Settings = Settings.Load(ModPath);

        // Switching the timer on should not fire at once on a stale time.
        if (Settings.AutoSchedule && !wasScheduled && Invasions.Current is null)
            Invasions.SetNext(DateTime.UtcNow.AddMinutes(Settings.FirstDelayMinutes));
    }

    public void Dispose()
    {
        Dispose(true);
        GC.SuppressFinalize(this);
    }

    protected virtual void Dispose(bool disposing)
    {
        if (_disposed)
            return;

        if (disposing)
        {
            Invasions.Shutdown();

            _harmony?.UnpatchAll(HarmonyId);
            _harmony = null;

            ModManager.Log($"[{Name}] shut down");
        }

        _disposed = true;
    }
}