using Movement;
using UnityEngine;

namespace AI
{
    public class BasicPatrollingEnemyAI : MonoBehaviour
    {
        [SerializeField] protected bool isMovingRight = false;

        [Space]
        [Header("Left Detector")]
        [SerializeField] protected Vector2 leftCliffDetectorOrigin = Vector2.left;
        [SerializeField] protected Vector2 leftCliffDetectorSize = Vector2.one;

        [Space]
        [Header("Right Detector")]
        [SerializeField] protected Vector2 rightCliffDetectorOrigin = Vector2.right;
        [SerializeField] protected Vector2 rightCliffDetectorSize = Vector2.one;

        [Space]
        [Header("Right Detector")]
        [SerializeField] protected LayerMask groundLayerMask = ~(1 << 6); // Everything except the "Player" layer

        protected IMovement movement = null;
        protected Collider2D[] nonAllocColliderArray = new Collider2D[10];

        protected Vector2 leftCliffPosition => GetCliffPositionInWorld(leftCliffDetectorOrigin);
        protected Vector2 rightCliffPosition => GetCliffPositionInWorld(rightCliffDetectorOrigin);

        protected bool IsLeftDetectorCollided => Physics2D.OverlapBoxNonAlloc(leftCliffPosition, leftCliffDetectorSize, 0, nonAllocColliderArray, groundLayerMask) != 0;
        protected bool IsRightDetectorCollided => Physics2D.OverlapBoxNonAlloc(rightCliffPosition, rightCliffDetectorSize, 0, nonAllocColliderArray, groundLayerMask) != 0;

        protected virtual void Awake()
        {
            movement = gameObject.AddComponent<EnemyMovement>();
        }

        protected virtual void FixedUpdate()
        {
            if ((isMovingRight && !IsRightDetectorCollided) || (!isMovingRight && !IsLeftDetectorCollided))
                isMovingRight = !isMovingRight;

            movement.Move(isMovingRight ? 1f : -1f);
        }

        protected Vector2 GetCliffPositionInWorld(Vector2 cliffPosition)
            => cliffPosition + (Vector2)transform.position;

        protected virtual void OnDrawGizmosSelected()
        {
            Gizmos.color = IsLeftDetectorCollided ? Color.green : Color.red;
            Gizmos.DrawWireCube(leftCliffPosition, leftCliffDetectorSize);

            Gizmos.color = IsRightDetectorCollided ? Color.green : Color.red;
            Gizmos.DrawWireCube(rightCliffPosition, rightCliffDetectorSize);
        }
    }
}