using System;
using UnityEngine;

public class CameraFollow : MonoBehaviour
{
    [SerializeField] private Transform camTarget;
    
    [SerializeField] private float distance;
    [SerializeField] private float height;
    [SerializeField] private float smoothness;
    
    [SerializeField] private bool autoStart;
	
	private Vector3 _velocity;
	private bool _isRunning;

	public void StartSystem()
	{
		if (camTarget == null)
		{
			Debug.LogError("Follow target is null!");
			return;
		}

		_isRunning = true;
	}

	public void StopSystem() => _isRunning = false;

	private void Start()
	{
		if (camTarget == null)
		{
			Debug.LogError("Follow target is null!");
			return;
		}

		_isRunning = autoStart;
	}

	private void LateUpdate()
    {
        if (!_isRunning) return;

		var cameraPosition = Vector3.zero;
        var targetPosition = camTarget.position;
		
		cameraPosition.x = targetPosition.x;
		cameraPosition.y = targetPosition.y + height;
		cameraPosition.z = Mathf.Clamp(targetPosition.z - distance, -10f, 18f);
		
		transform.position = Vector3.SmoothDamp(transform.position, cameraPosition, ref _velocity, smoothness);
    }
}