using Unity.VisualScripting.FullSerializer;
using UnityEditor.Experimental.GraphView;
using UnityEngine;

/// <summary>
/// Playermovement, sowie Animation usw. hier angeschaut: https://www.youtube.com/playlist?list=PLgOEwFbvGm5o8hayFB6skAfa8Z-mw4dPV
/// </summary>
public class PlayerMovement : MonoBehaviour 
{
    [SerializeField] private float speed;
    [SerializeField] private float jumpPower;
    [SerializeField] private LayerMask groundLayer;
    [SerializeField] private LayerMask wallLayer;
    private Rigidbody2D body;
    private Animator anim;
    private BoxCollider2D boxCollider;
    private float wallJumpCooldown;
    private float horizontalInput;

    private void Awake()
    {
        // grab references for rigidbody & animatior from gameobject
        body = GetComponent<Rigidbody2D>();
        anim = GetComponent<Animator>();
        boxCollider = GetComponent<BoxCollider2D>();
    }

    private void Update()
    {
        horizontalInput = Input.GetAxis("Horizontal");

        // move
        body.velocity = new Vector2(horizontalInput * speed, body.velocity.y);

        // flip player when moving left-right
        if (horizontalInput > 0.01f)
        {
            transform.localScale = Vector3.one;
        }  
        else if (horizontalInput < -0.01f)
        {
            transform.localScale = new Vector3(-1, 1, 1);
        }

        // wall jump logic
        if (wallJumpCooldown > 0.2f)
        {
            body.velocity = new Vector2(horizontalInput * speed, body.velocity.y);

            if (onWall() && !isGrounded())
            {
                body.gravityScale = 0;
                body.velocity = Vector2.zero;
            }
            else
            {
                body.gravityScale = 2;
            }

            if (Input.GetKey(KeyCode.W))
            {
                Jump();
            }
        }
        // jumpwall cd
        else
        {
            wallJumpCooldown += Time.deltaTime;
        }

        // set animator parameters
        anim.SetBool("run", horizontalInput != 0);
        anim.SetBool("grounded", isGrounded());    
    }

    private void Jump()
    {
        if (isGrounded())
        {
            body.velocity = new Vector2(body.velocity.x, jumpPower);
            anim.SetTrigger("jump");
        }
        // "climb" on wall
        else if (onWall() && !isGrounded())
        {
            if (horizontalInput == 0)
            {
                body.velocity = new Vector2(-Mathf.Sign(transform.localScale.x) * 9, 0);
                transform.localScale = new Vector3(-Mathf.Sign(transform.localScale.x), transform.localScale.y, transform.localScale.z);
            }
            else
            {
                body.velocity = new Vector2(-Mathf.Sign(transform.localScale.x) * 3, 6);
            }
            wallJumpCooldown = 0;
        }
    }

    private void OnCollisionEnter2D(Collision2D collision)
    {

    }

    private bool isGrounded()
    {
        RaycastHit2D raycastHit = Physics2D.BoxCast(boxCollider.bounds.center, boxCollider.bounds.size, 0, Vector2.down, 0.1f, groundLayer);
        return raycastHit.collider != null;
    }

    private bool onWall()
    {
        RaycastHit2D raycastHit = Physics2D.BoxCast(boxCollider.bounds.center, boxCollider.bounds.size, 0, new Vector2(transform.localScale.x, 0), 0.1f, wallLayer);
        return raycastHit.collider != null;
    }
}