using AcDream.Plugin.Abstractions;
using OpenAC.MosswartMassacre.Quests;

namespace OpenAC.MosswartMassacre.FlagTracker;

/// <summary>
/// The "Mossy Tracker" window, opened from the main window's Mossy Tracker
/// tab: augmentations, luminance auras, recalls,
/// cantrips, tracked weapons and quest timers for the character in the world.
/// Nothing here reaches the backend.
/// </summary>
/// <remarks>
/// The window exists only on a host that draws one; on a headless host this
/// feature registers nothing and does nothing. The pages are read at login
/// and whenever the player presses a page's Refresh button, as the original
/// read them when its window opened and on Refresh; the quest page follows
/// the quest list and redraws its countdowns every five seconds.
/// </remarks>
internal sealed class FlagTrackerFeature : IMmFeature
{
    /// <summary>The panel's markup file, beside the plugin assembly.</summary>
    public const string MarkupFile = "mosswartmassacre-flagtracker.xml";

    /// <summary>How often the quest countdowns are redrawn.</summary>
    public static readonly TimeSpan QuestRedrawInterval = TimeSpan.FromSeconds(5);

    private readonly MmContext _context;
    private readonly QuestManager _quests;
    private readonly FlagTrackerData _data;
    private readonly IDisposable? _panel;
    private readonly Action? _onQuestsChanged;
    private IDisposable? _questRedraw;

    public FlagTrackerFeature(MmContext context, QuestManager quests)
    {
        _context = context;
        _quests = quests;
        _data = new FlagTrackerData(context.Automation);
        if (!context.Host.HasUi)
            return;

        Panel = new FlagTrackerViewModel();
        Panel.RefreshRequested += OnRefreshRequested;
        _onQuestsChanged = ShowQuests;
        _quests.QuestsChanged += _onQuestsChanged;

        string directory = Path.GetDirectoryName(typeof(FlagTrackerFeature).Assembly.Location) ?? ".";
        _panel = context.Host.Ui.RegisterPanel(
            new PluginPanelDescriptor("flagtracker", "Mossy Tracker")
            {
                // Shown while the binding's IsVisible is set; the host's own
                // shown state starts true so that flag alone opens it.
                StartVisible = true,
                // No bar button: as in the original, the main window's
                // Mossy Tracker tab opens it.
                ShowInSidePanel = false,
            },
            Path.Combine(directory, MarkupFile),
            Panel);
    }

    /// <summary>
    /// The window's binding object; set its <c>IsVisible</c> to open the
    /// window. Null on a host without a window.
    /// </summary>
    public FlagTrackerViewModel? Panel { get; }

    internal FlagTrackerData Data => _data;

    public void OnLogin()
    {
        if (Panel is null)
            return;
        RefreshAll();
        _questRedraw?.Dispose();
        _questRedraw = _context.Scheduler.Every(QuestRedrawInterval, ShowQuests);
    }

    public void OnLogoff()
    {
        _questRedraw?.Dispose();
        _questRedraw = null;
        Panel?.Clear();
    }

    public void Dispose()
    {
        OnLogoff();
        if (_onQuestsChanged is not null)
            _quests.QuestsChanged -= _onQuestsChanged;
        if (Panel is not null)
            Panel.RefreshRequested -= OnRefreshRequested;
        _panel?.Dispose();
    }

    /// <summary>Reads every page again and redraws it.</summary>
    public void RefreshAll()
    {
        if (Panel is null)
            return;
        try
        {
            _data.RefreshAll();
        }
        catch (Exception ex)
        {
            _context.Chat.Write($"[MossyTracker] Data refresh failed: {ex.Message}");
        }
        Panel.ShowData(_data);
        ShowQuests();
    }

    private void ShowQuests()
    {
        if (Panel is null || !_context.IsLoggedIn)
            return;
        Panel.ShowQuestRows(_quests.QuestList, _quests.UnixNow);
    }

    private void OnRefreshRequested(string button)
    {
        if (Panel is null || !_context.IsLoggedIn)
            return;
        try
        {
            switch (button)
            {
                case nameof(FlagTrackerViewModel.RefreshAugs):
                    _data.RefreshAugmentations();
                    Panel.ShowAugmentations(_data);
                    break;
                case nameof(FlagTrackerViewModel.RefreshLum):
                    _data.RefreshLuminanceAuras();
                    Panel.ShowLuminance(_data);
                    break;
                case nameof(FlagTrackerViewModel.RefreshRecalls):
                    _data.RefreshRecallSpells();
                    Panel.ShowRecallSpells(_data);
                    break;
                case nameof(FlagTrackerViewModel.RefreshCantrips):
                    _data.RefreshCantrips();
                    Panel.ShowCantripRows(_data);
                    break;
                case nameof(FlagTrackerViewModel.RefreshWeapons):
                    _data.RefreshWeapons();
                    Panel.ShowWeaponRows(_data);
                    break;
                case nameof(FlagTrackerViewModel.RefreshQuests):
                    _quests.RefreshQuests();
                    ShowQuests();
                    break;
            }
        }
        catch (Exception ex)
        {
            _context.Chat.Write($"[MossyTracker] Refresh failed: {ex.Message}");
        }
    }
}