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

public class Platformer : MonoBehaviour
{
    public Rigidbody2D rb;
    public float speed = 4;
    public float jumpForce;

    bool isGrounded = false;
    public Transform isGroundedChecker;
    public float checkGroundedRadius;
    public LayerMask groundLayer;

    public float fallMultiplier = 2.5f;
    public float lowJumpMultiplier = 2f;

    // Start is called before the first frame update
    void Start(){
        rb = GetComponent<Rigidbody2D>();
    }

    // Update is called once per frame
    void Update(){
        Move();
        Jump();
        CheckIfGrounded();
        BetterJump();
    }

    void Move() {
        float x = Input.GetAxisRaw("Horizontal");
        float moveBy = x * speed;
        rb.velocity = new Vector2(moveBy, rb.velocity.y);
    }

    void Jump(){
        if (Input.GetKeyDown(KeyCode.Space) && isGrounded) {
            rb.velocity = new Vector2(rb.velocity.x, jumpForce);
        }
    }

    void CheckIfGrounded() {
        Collider2D collider = Physics2D.OverlapCircle(isGroundedChecker.position, checkGroundedRadius, groundLayer);

        if (collider != null)
        {
            isGrounded = true;
        }else{
            isGrounded = false;
        }
    }

    void BetterJump() {
        if (rb.velocity.y < 0)
        {
            rb.velocity += Vector2.up * Physics2D.gravity * (fallMultiplier - 1) * Time.deltaTime;
        }else if(rb.velocity.y > 0 && !Input.GetKey(KeyCode.Space)){
            rb.velocity += Vector2.up * Physics2D.gravity * (lowJumpMultiplier - 1) * Time.deltaTime;
        }
    }
}