using UnityEngine;

public class Joystick : MonoBehaviour
{
	[SerializeField] private RectTransform center;
	[SerializeField] private RectTransform knob;
	[SerializeField] private float range;
	[SerializeField] private bool fixedJoystick;
	
	public Vector2 Direction { get; private set; }

	private GameObject StickCenter => center.gameObject;
	private GameObject StickKnob => knob.gameObject;
	
	private bool _isRunning;
	
	public void RunSystem()
	{
		HideJoystick();
		_isRunning = true;
	}
	
	public void PauseSystem() => _isRunning = false;

	private void Update()
	{
		if (!_isRunning) return;
		
		var pointerPosition = Input.mousePosition;
		
		if (Input.GetMouseButtonDown(0))
		{
			ShowJoystick();
			knob.position = pointerPosition;
			center.position = pointerPosition;
			return;
		}
		
		if (Input.GetMouseButton(0))
		{
			knob.position = center.position + Vector3.ClampMagnitude(pointerPosition - center.position, center.sizeDelta.x * range);
			
			if (knob.position != Input.mousePosition && !fixedJoystick)
			{
				var outsideBoundsVector = Input.mousePosition - knob.position;
				center.position += outsideBoundsVector;
			}
			
			Direction = (knob.position - center.position).normalized;
			return;
		}
		
		if (Input.GetMouseButtonUp(0))
		{
			HideJoystick();
			Direction = Vector2.zero;
		}
	}

	private void ShowJoystick()
	{
		StickCenter.SetActive(true);
		StickKnob.SetActive(true);
	}
	
	private void HideJoystick()
	{
		StickCenter.SetActive(false);
		StickKnob.SetActive(false);
	}
}