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

public class Follower_Script : MonoBehaviour
{
    GameObject player;
    Player_Move_Script moveScript;

    private Queue<PlayerState> states = new Queue<PlayerState>();

    public int playerLayer = 8;
	
    private float width;
    private float height;

    // Start is called before the first frame update
    void Start()
    {
        player = GameObject.FindGameObjectWithTag("Player");
        moveScript = player.GetComponent<Player_Move_Script>();
		
        width = GetComponent<SpriteRenderer>().bounds.size.x;
        height = GetComponent<SpriteRenderer>().bounds.size.y;
    }

    // Update is called once per frame
    void Update()
    {
        if (Static_GlobalStats.paused) {			
			float x = player.transform.position.x + (-player.transform.localScale.x * width * 1.15f);
			x = (transform.position.x + x) / 2;
			
			float y = (transform.position.y + player.transform.position.y) / 2;
			
			transform.position = new Vector2(x, y);
			
            GetComponent<Animator>().SetFloat("speed", 0);
            GetComponent<Animator>().SetBool("grounded", true);
			
			return;
        }

        if (Mathf.Abs(moveScript.speed) > 0.1f || player.GetComponent<Player_Move_Script>().grounded == false) {
            states.Enqueue(new PlayerState(player));
        }
		
		int layerMask = ~(1 << playerLayer);
		RaycastHit2D groundHit = Physics2D.Raycast(transform.position, Vector2.down, height * 0.6f, layerMask);

        if (states.Count > 48 || (!groundHit.collider && states.Count > 0)) {
            PlayerState state = states.Dequeue();

            transform.position = state.position;
            transform.localScale = new Vector2(state.speed == 0 ? transform.localScale.x : Mathf.Abs(state.speed) / state.speed, transform.localScale.y);
            GetComponent<Animator>().SetFloat("speed", Mathf.Abs(state.speed));
            GetComponent<Animator>().SetBool("grounded", state.grounded);
        }
        else if (!groundHit.collider) {
			float x = player.transform.position.x + (-player.transform.localScale.x * width * 1.15f);
			x = (transform.position.x + x) / 2;
			
			float y = (transform.position.y + player.transform.position.y) / 2;
			y -= 0.2f;
			
			transform.position = new Vector2(x, y);
			
            GetComponent<Animator>().SetFloat("speed", 0);
            GetComponent<Animator>().SetBool("grounded", true);
        }
		else {
            GetComponent<Animator>().SetFloat("speed", 0);
            GetComponent<Animator>().SetBool("grounded", groundHit.collider != null);
		}
    }

    private class PlayerState {
        public Vector2 position;
        public float speed;
        public bool grounded;

        public PlayerState(GameObject player) {
            position = new Vector2(player.transform.position.x, player.transform.position.y);
            speed = player.GetComponent<Player_Move_Script>().speed;
            grounded = player.GetComponent<Player_Move_Script>().grounded;
        }
    }
}