using System.Collections.Generic;
using System.Linq;
using UnityEngine;

public class Snake : MonoBehaviour
{
    // Panel for gameover
    public RectTransform GameOver_m;

    //text game over
    public Text eGameSmore;

    // Snake ate the food
    bool ate = false;

    // Tail Prefab
    public GameObject tailPrefab;

    // Current Movement Direction
    Vector2                 dir  = Vector2.right;
    private List<Transform> tail = new List<Transform>();

    // initialization
    void Start()
    {
        // Move the Snake every second
        InvokeRepeating("Move", 0.1f, 0.1f);
    }

    // Update is called once per Frame
    void Update()
    {
        // Move in a new Direction?
        if (Input.GetKey(KeyCode.RightArrow))
            dir = Vector2.right;
        else if (Input.GetKey(KeyCode.DownArrow))
            dir = -Vector2.up; // -up means down -- who made these rules up....
        else if (Input.GetKey(KeyCode.LeftArrow))
            dir = -Vector2.right; // -right means left -- who made these rules up....
        else if (Input.GetKey(KeyCode.UpArrow))
            dir = Vector2.up;
    }

    void Move()
    {
        // Save current position (gap will be here)
        Vector2 v = transform.position;

        // Move head into new direction (now there is a gap)
        transform.Translate(dir);

        // Ate something? Then insert new Element into gap
        if (ate)
        {
            // Load Prefab into the world
            GameObject g = (GameObject) Instantiate(tailPrefab,
                                                    v,
                                                    Quaternion.identity);

            // Keep track of it in our tail list
            tail.Insert(0, g.transform);

            // Reset the flag
            ate = false;
        }
        //Does have a Tail?
        else if (tail.Count > 0)
        {
            // Move last Tail Element to where the Head was
            tail.Last().position = v;

            // Add to front of list, remove from the back
            tail.Insert(0, tail.Last());
            tail.RemoveAt(tail.Count - 1);
        }

    }

    void OnTriggerEnter2D(Collider2D coll)
    {
        // Food?
        if (coll.name.StartsWith("FoodPrefab"))
        {
            // Get longer in next Move call
            ate = true;

            // Remove the Food
            Destroy(coll.gameObject);
        }
            // Collided with Tail or Border
            else Destroy(gameObject);
        {
            //  'You lose' - Game over.
            else private void OnEnable()
                {
                StartCoroutine(Co_ReloadScene(3f));
            }
               private IEnumerator Co_ReloadScene(float delay)
                {
               yield return new WaitForSeconds(delay);
            //load scene code here. Game Over
                int scene = SceneManager.GetActiveScene().buildIndex;
                SceneManager.LoadScene(scene, LoadSceneMode.Single);
            }


        }
    }
}