using UnityEngine;

[RequireComponent(typeof(Rigidbody2D))]
public class EnemyController : MonoBehaviour
{
    public GameObject playerObj;
    public float viewDistance = 5f;
    public float viewAngle = 60f;
    public float moveSpeed = 3f;
    public float acceleration = 10f;

    private LayerMask obstacleMask;
    private Animator animator;
    private Rigidbody2D rb;
    private Vector2 targetVelocity = Vector2.zero;

    void Start()
    {
        rb = GetComponent<Rigidbody2D>();
        animator = GetComponent<Animator>();

        playerObj = GameManager.Instance.playerObj;
        if (playerObj == null)
        {
            playerObj = GameObject.FindGameObjectWithTag("Player");
            //Debug.Log("Player not found!");
        }
    }

    void FixedUpdate()
    {
        if (playerObj != null && PlayerInSight())
        {
            //Debug.Log("Scanned player");
            //Debug.Log($"Player: {player}\n PlayerInSight: {PlayerInSight()}");
            Vector2 dir = ((Vector2)playerObj.transform.position - rb.position).normalized;
            targetVelocity = dir * moveSpeed;
        }
        else
        {
            //Debug.Log("No player in sight");
            targetVelocity = Vector2.zero;
        }

        rb.linearVelocity = Vector2.MoveTowards(rb.linearVelocity, targetVelocity, acceleration * Time.fixedDeltaTime);
        animator.SetFloat("Speed", Mathf.Abs(targetVelocity.magnitude));
    }

    private bool PlayerInSight()
    {
        Transform player = playerObj.transform;
        Vector2 directionToPlayer = player.position - transform.position;
        float distanceToPlayer = directionToPlayer.magnitude;

        if (distanceToPlayer > viewDistance)
            return false;

        float angle = Vector2.Angle(transform.right, directionToPlayer);
        if (angle > viewAngle / 2f)
            return false;

        RaycastHit2D hit = Physics2D.Raycast(transform.position, directionToPlayer.normalized, distanceToPlayer, obstacleMask);
        if (hit.collider != null && hit.collider.transform != player)
            return false;

        return true;
    }

    void OnCollisionEnter2D(Collision2D collision)
    {
        if (collision.collider.CompareTag("Player"))
        {
            Rigidbody2D playerRb = collision.collider.GetComponent<Rigidbody2D>();
            PlayerController playerController = playerObj.GetComponent<PlayerController>();
            if (playerRb == null) return;

            Vector2 contactNormal = collision.GetContact(0).normal;

            if (contactNormal.y < -0.5f)
            {
                playerRb.linearVelocity = new Vector2(playerRb.linearVelocity.x, 35f);
                Die();
            }
            else
            {
                playerController.Die();
            }
        }
        else if (collision.collider.CompareTag("Projectile")) Die();
    }

    private void OnDrawGizmos()
    {
        if (playerObj == null) return;

        Vector2 origin = transform.position;
        Vector2 directionToPlayer = (playerObj.transform.position - transform.position);
        float distanceToPlayer = directionToPlayer.magnitude;

        Vector2 rightDir = Quaternion.Euler(0, 0, +viewAngle / 2f) * transform.right;
        Vector2 leftDir = Quaternion.Euler(0, 0, -viewAngle / 2f) * transform.right;

        Gizmos.color = Color.yellow;
        Gizmos.DrawLine(origin, origin + (rightDir * viewDistance));
        Gizmos.DrawLine(origin, origin + (leftDir * viewDistance));

        Gizmos.DrawWireSphere(origin, viewDistance);

        if (distanceToPlayer <= viewDistance)
        {
            Gizmos.color = Color.red;
            Gizmos.DrawLine(origin, playerObj.transform.position);

            RaycastHit2D hit = Physics2D.Raycast(origin, directionToPlayer.normalized, distanceToPlayer);
            if (hit.collider != null)
            {
                Gizmos.color = Color.green;
                Gizmos.DrawSphere(hit.point, 0.05f);
            }
        }
    }

    void Die()
    {
        Destroy(gameObject);
    }

}