using System;
using System.Numerics;
using System.Runtime.InteropServices;
using Dalamud.Game.ClientState.Objects.SubKinds;
using Dalamud.Game.ClientState.Objects.Types;
using Dalamud.Plugin;
using Dalamud.Plugin.Services;
using ImGuiNET;

namespace Pal.Client.Floors;

/// <summary>
/// This isn't very useful for running deep dungeons normally, but it is for plugin dev.
///
/// Needs the corresponding beta feature to be enabled.
/// </summary>
internal sealed class ObjectTableDebug : IDisposable
{
    public const string FeatureName = nameof(ObjectTableDebug);

    private readonly IDalamudPluginInterface _pluginInterface;
    private readonly IObjectTable _objectTable;
    private readonly IGameGui _gameGui;
    private readonly IClientState _clientState;

    public ObjectTableDebug(IDalamudPluginInterface pluginInterface, IObjectTable objectTable, IGameGui gameGui,
        IClientState clientState)
    {
        _pluginInterface = pluginInterface;
        _objectTable = objectTable;
        _gameGui = gameGui;
        _clientState = clientState;

        _pluginInterface.UiBuilder.Draw += Draw;
    }

    private void Draw()
    {
        int index = 0;
        foreach (IGameObject obj in _objectTable)
        {
            if (obj is IEventObj eventObj && string.IsNullOrEmpty(eventObj.Name.ToString()))
            {
                ++index;
                int model = Marshal.ReadInt32(obj.Address + 128);

                if (_gameGui.WorldToScreen(obj.Position, out var screenCoords))
                {
                    // So, while WorldToScreen will return false if the point is off of game client screen, to
                    // to avoid performance issues, we have to manually determine if creating a window would
                    // produce a new viewport, and skip rendering it if so
                    float distance = DistanceToPlayer(obj.Position);
                    var objectText =
                        $"{obj.Address.ToInt64():X}:{obj.EntityId:X}[{index}]\nkind: {obj.ObjectKind} sub: {obj.SubKind}\nmodel: {model}\nname: {obj.Name}\ndata id: {obj.DataId}";

                    var screenPos = ImGui.GetMainViewport().Pos;
                    var screenSize = ImGui.GetMainViewport().Size;

                    var windowSize = ImGui.CalcTextSize(objectText);

                    // Add some extra safety padding
                    windowSize.X += ImGui.GetStyle().WindowPadding.X + 10;
                    windowSize.Y += ImGui.GetStyle().WindowPadding.Y + 10;

                    if (screenCoords.X + windowSize.X > screenPos.X + screenSize.X ||
                        screenCoords.Y + windowSize.Y > screenPos.Y + screenSize.Y)
                        continue;

                    if (distance > 50f)
                        continue;

                    ImGui.SetNextWindowPos(new Vector2(screenCoords.X, screenCoords.Y));

                    ImGui.SetNextWindowBgAlpha(Math.Max(1f - (distance / 50f), 0.2f));
                    if (ImGui.Begin(
                            $"PalacePal_{nameof(ObjectTableDebug)}_{index}",
                            ImGuiWindowFlags.NoDecoration |
                            ImGuiWindowFlags.AlwaysAutoResize |
                            ImGuiWindowFlags.NoSavedSettings |
                            ImGuiWindowFlags.NoMove |
                            ImGuiWindowFlags.NoMouseInputs |
                            ImGuiWindowFlags.NoDocking |
                            ImGuiWindowFlags.NoFocusOnAppearing |
                            ImGuiWindowFlags.NoNav))
                        ImGui.Text(objectText);
                    ImGui.End();
                }
            }
        }
    }

    private float DistanceToPlayer(Vector3 center)
        => Vector3.Distance(_clientState.LocalPlayer?.Position ?? Vector3.Zero, center);

    public void Dispose()
    {
        _pluginInterface.UiBuilder.Draw -= Draw;
    }
}