using UnityEngine;
using System.Collections.Generic;

enum Direction { LEFT, STRAIGHT, RIGHT }

public class LevelGenerator : MonoBehaviour
{

    private Queue<GameObject> _leftTurns = new Queue<GameObject>();
    private Queue<GameObject> _rightTurns = new Queue<GameObject>();
    private Queue<GameObject> _straightRoad = new Queue<GameObject>();

    private const int _minDir = 0;
    private const int _maxDir = 3;

    private const int _angleOffset = 90;

    [SerializeField] private GameObject _oldRoad;

    private GameObject _currentPrefab;
    private float _currentAngleZ = 0;
    private float _oldAngleZ = 0;
    private bool _generationTag = false;


    private GameObject GetRoad(int _way)
    {
        GameObject temp = null;
        switch ((Direction)_way)
        {
            case Direction.LEFT:
                temp = _leftTurns.Dequeue();
                break;

            case Direction.STRAIGHT:
                temp = _straightRoad.Dequeue();
                break;

            case Direction.RIGHT:
                temp = _rightTurns.Dequeue();
                break;
        }
        temp.SetActive(true);
        return temp;
    }

    public void CreatePlatform()
    {

        int way = new System.Random().Next(_minDir, _maxDir); ;
        _currentPrefab = GetRoad(way);

        _currentPrefab.transform.position = _oldRoad.transform.GetChild(way).position;

        if (way == (int)Direction.LEFT || way == (int)Direction.RIGHT)
        {
            _oldAngleZ = _currentAngleZ;
            SetCorrectAngle((Direction)way);
            _currentPrefab.transform.rotation = Quaternion.Euler(0, 0, _oldAngleZ);
            return;
        }
        _currentPrefab.transform.rotation = Quaternion.Euler(0, 0, _currentAngleZ);

        _oldRoad = _currentPrefab;

    }

    private void SetCorrectAngle(Direction _dir)
    {
        switch (_dir)
        {
            case Direction.LEFT:
                    _currentAngleZ += _angleOffset;
                break;

            case Direction.RIGHT:
                    _currentAngleZ -= _angleOffset;
                break;
        }
    }

    private void OnTriggerExit2D(Collider2D collision)
    {
        if (_generationTag)
        {
            CreatePlatform();
        }
        if (collision.gameObject.tag == "LeftTurn")
        {
            collision.gameObject.SetActive(false);
            collision.gameObject.transform.rotation = Quaternion.Euler(0, 0, 0);
            _leftTurns.Enqueue(collision.gameObject);

        }
        if(collision.gameObject.tag == "RightTurn")
        {
            collision.gameObject.SetActive(false);
            collision.gameObject.transform.rotation = Quaternion.Euler(0, 0, 0);
            _rightTurns.Enqueue(collision.gameObject);

        }
        if(collision.gameObject.tag == "Straight")
        {
            collision.gameObject.SetActive(false);
            collision.gameObject.transform.rotation = Quaternion.Euler(0, 0, 0);
            _straightRoad.Enqueue(collision.gameObject);

        }
        if(collision.gameObject.tag == "Generation Tag")
        {
            _generationTag = true;
            collision.gameObject.SetActive(false);
        }
    }
}