using System;
using Godot;
using Godot.Collections;

public enum TurretType
{
	Kitsune,
	Oni,
	Tengu
}

public partial class TurretController : Node2D
{
	[Export] private Dictionary<TurretType, PackedScene> _typeToPrefab;
	[Export] private Dictionary<TurretType, PackedScene> _typeToPlaceholder;
	[Export] private Node2D _turretParent;

	[Signal]
	public delegate void PlaceTurretEventHandler(TurretType t);

	private bool _placingTurret = false;

	private TurretPlaceholder _turretPlaceholder;
	private TurretType _currentlyPlacingType;

	public override void _Ready()
	{
		PlaceTurret += StartPlaceingTurret;
	}

	public override void _Input(InputEvent @event)
	{
		if (_turretPlaceholder == null) return;
		if (!_placingTurret) return;
		var mpos = GetGlobalMousePosition();
		_turretPlaceholder.GlobalPosition = mpos;
		if (@event is InputEventMouseButton mb)
		{
			switch (mb.ButtonIndex)
			{
				case MouseButton.Left:
					if (!_turretPlaceholder.CanPlace) return;
					if (!GameController.Instance.TryRemoveCurrency(_turretPlaceholder.Cost)) return;
					var newT = _typeToPrefab[_currentlyPlacingType].Instantiate() as Node2D;
					_turretParent.AddChild(newT);
					newT.GlobalPosition = mpos;
					break;
				case MouseButton.Right:
					break;
				default:
					return;
			}
			StopPlacingTurret(); 
		}
	}

	private void StartPlaceingTurret(TurretType t)
	{
		if (_turretPlaceholder != null)
		{
			_turretPlaceholder.GetParent()?.RemoveChild(_turretPlaceholder);
			_turretPlaceholder.QueueFree();
		}

		_turretPlaceholder = _typeToPlaceholder[t].Instantiate() as TurretPlaceholder;
		_turretParent.AddChild(_turretPlaceholder);
		_currentlyPlacingType = t;
		_placingTurret = true;
	}

	private void StopPlacingTurret()
	{
		_turretPlaceholder.GetParent()?.RemoveChild(_turretPlaceholder);
		_turretPlaceholder.QueueFree();
		_turretPlaceholder = null;
		_placingTurret = false;
	}
}