using UnityEngine;

public class ElevationHandler : MonoBehaviour
{
    bool onStairs = false; //Variable to tell the code if the player is on stairs or not
    //Variables to define my tilemaps/different levels of evelvation
    int groundMiddle; 
    int groundBottom;
    int groundTop;

    void Start()
    {
        //Setting up layer identification for tilemaps
        groundMiddle = LayerMask.NameToLayer("Ground_Middle");
        groundBottom = LayerMask.NameToLayer("Ground_Bottom");
        groundTop = LayerMask.NameToLayer("Ground_Top");
    }

    //This method is called when my player's collider enters a trigger (my stairs)
    void OnTriggerEnter2D(Collider2D other) 
    {
        if (other.CompareTag("Stairs"))
        {
            onStairs = true;
        }
    }

    //This method is called when my player's collider exits a trigger (my stairs)
    void OnTriggerExit2D(Collider2D other) 
    {
        if (other.CompareTag("Stairs"))
        {
            onStairs = false;
        }
    }

    // Update is called once per frame
    void Update()
    {
        if (onStairs) //Avoid collisions with all tilemaps when on stairs (allowing for the player to move up or down stairs to a different tilemap/elevation)
        {
            Physics2D.IgnoreLayerCollision(LayerMask.NameToLayer("Player"), groundMiddle, true);
            Physics2D.IgnoreLayerCollision(LayerMask.NameToLayer("Player"), groundBottom, true);
            Physics2D.IgnoreLayerCollision(LayerMask.NameToLayer("Player"), groundTop, true);
        }

        else //If not on stairs then keep all collisions with tilemaps on, disallowing elevation change
        {
            Physics2D.IgnoreLayerCollision(LayerMask.NameToLayer("Player"), groundMiddle, false);
            Physics2D.IgnoreLayerCollision(LayerMask.NameToLayer("Player"), groundBottom, false);
            Physics2D.IgnoreLayerCollision(LayerMask.NameToLayer("Player"), groundTop, false);
        }
    }
}