using FactoryGame.Entities;
using Godot;
using System;
using System.Collections.Generic;
using System.Linq;

public partial class CollisionComponent : Area3D, IComponent {
	public enum CollisionComponentMode {
		Body,
		BodyShape,
		Area,
		AreaShape
	}
	[Export]
	public CollisionComponentMode Mode { get; set; } = CollisionComponentMode.Body;
	[ExportGroup("White List")]
	[Export]
	public bool UseWhiteList { get; set; }
	[Export]
	public Node3D[]? WhiteList { get; set; }
	[ExportGroup("Black List")]
	[Export]
	public bool UseBlackList { get; set; }
	[Export]
	public Node3D[]? BlackList { get; set; }

	public IReadOnlyList<Node3D> Collisions => _collisions;
	private List<Node3D> _collisions = new();
	public override void _Ready() {
		switch (Mode) {
			case CollisionComponentMode.Body: {
					BodyEntered += (body) => Enter(body);
					BodyExited += (body) => Exit(body);
				}
				; break;
			case CollisionComponentMode.BodyShape: {
					BodyShapeEntered += (_, body, _, _) => Enter(body);
					BodyShapeExited += (_, body, _, _) => Exit(body);
				}
				; break;
			case CollisionComponentMode.Area: {
					AreaEntered += Enter;
					AreaEntered += Exit;
				}
				; break;
			case CollisionComponentMode.AreaShape: {
					AreaShapeEntered += (_, body, _, _) => Enter(body);
					AreaShapeEntered += (_, body, _, _) => Exit(body);
				}
				; break;
		}

		base._Ready();
	}

	private void Enter(Node3D body) {
		if (CheckBody(body))
			_collisions.Add(body);
	}
	private void Exit(Node3D body) {
		if (_collisions.Contains(body))
			_collisions.Remove(body);
	}

	private bool CheckBody(Node3D body) {
		if (UseBlackList && BlackList != null && BlackList.Contains(body))
			return false;
		if (UseWhiteList && WhiteList != null && !WhiteList.Contains(body))
			return false;
		return true;
	}

	public bool IsCollide() => _collisions.Count > 0;
	public bool IsCollide(Node3D body) => _collisions.Contains(body);
}