namespace Aeshnidae.Leaderboard;

/// <summary>
/// Leaderboards. Who is highest, richest, deadliest and most enlightened, from the
/// numbers the server already keeps plus the few it did not (what each character
/// has earned and spent). /top in game, a page in the Codex, leaderboard.json for
/// the website, and a daily post to Discord.
/// </summary>
public class Mod : IHarmonyMod
{
    public static readonly string Name = typeof(Mod).Assembly.GetName().Name!;
    public static readonly string HarmonyId = $"mod.{Name.ToLowerInvariant()}";
    public static readonly string ModPath = Path.Combine(ModManager.ModPath, Name);

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

    public static Settings Settings { get; private set; } = new();

    private static Harmony? _harmony;
    private static Timer? _refresh;
    private static Timer? _flush;
    private bool _disposed;

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

        Db.Initialize();

        _harmony = new Harmony(HarmonyId);
        _harmony.PatchAllUncategorized(typeof(Mod).Assembly);
        Hooks.BindSiblings(_harmony);

        // The first refresh runs off the timer thread too, so enabling never blocks
        // on the database.
        var every = TimeSpan.FromMinutes(Math.Max(1, Settings.RefreshMinutes));
        _refresh = new Timer(_ => Tick(), null, TimeSpan.FromSeconds(2), every);
        _flush = new Timer(_ => Db.Flush(), null, TimeSpan.FromSeconds(Settings.FlushSeconds), TimeSpan.FromSeconds(Math.Max(5, Settings.FlushSeconds)));

        var unbound = Hooks.Status.Where(s => !s.Bound).Select(s => $"{s.Target} ({s.Note})").ToList();

        ModManager.Log($"[{Name}] ready - {Boards.All.Count} boards, refresh every {every.TotalMinutes:N0} min" +
                       $"{(Db.Ready ? "" : " (storage unavailable, boards off)")}" +
                       $"{(unbound.Count == 0 ? "" : $"; not hooked: {string.Join(", ", unbound)}")}");
    }

    /// <summary>One refresh: rebind any hook that failed (its mod may be up now), rebuild, maybe post.</summary>
    private static void Tick()
    {
        try
        {
            if (_harmony is not null && !Hooks.AllBound)
                Hooks.BindSiblings(_harmony);

            Db.Flush();
            Boards.Refresh();
            Discord.MaybePostDaily();
        }
        catch (Exception ex)
        {
            ModManager.Log($"[{Name}] tick failed: {ex.Message}", ModManager.LogLevel.Error);
        }
    }

    public static void RefreshNow() => Tick();

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

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

        if (disposing)
        {
            _refresh?.Dispose();
            _refresh = null;
            _flush?.Dispose();
            _flush = null;

            try { Db.Flush(); } catch { /* logged inside */ }

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

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

        _disposed = true;
    }
}