using Godot;
using System;
using System.Collections.Generic;

// ReSharper disable MemberCanBePrivate.Global

namespace BITKit;
public partial class NodeBuilder : Node
{
	[Export] private bool clearOnStart = true;
	[Export] private bool clearTemplateOnly = true;

	[ExportCategory("UX")]
	[Export] private Control emptyHints;
	[ExportCategory("Template")]
	[Export] private PackedScene template;
	
	public Node[] Instances => _instances.ToArray();
	private readonly List<Node> _instances = new List<Node>();
	
	public override void _Ready()
	{
		if (clearOnStart)
		{
			Clear();
		}
	}
	public T Build<T>() where T : Node, new()
	{
		Node instance;
		if (template is not null)
		{
			instance = template.Instantiate<T>();
			
			AddChild(instance);
		}
		else
		{
			instance = this.Create<T>();
		}
		
		emptyHints?.Hide();
		
		_instances.Add(instance);
		return (T)instance;
	}

	public void Clear()
	{
		_instances.Clear();
		emptyHints?.Show();
		if (clearTemplateOnly && template is not null)
		{
			foreach (var x in GetChildren())
			{
				switch (template)
				{
					case null:
						x.QueueFree();
						break;
					case (var y) when y.ResourcePath == x.SceneFilePath:
						x.QueueFree();
						break;
				}
			}
		}
		else
		{
			MathNode.ClearChild(this);
		}
	}
}