using Movement;
using UnityEngine;

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

        protected IMovement movement = null;

        protected CollissionChecker leftWallChecker = null;
        protected CollissionChecker rightWallChecker = null;
        protected CollissionChecker leftGroundChecker = null;
        protected CollissionChecker rightGroundChecker = null;


        // If moving Right, and either there's no more ground to move into or there is a wall at the Right side of the enemy OR
        // If moving Left, and either there's no more ground to move into or there is a wall at the Left side of the enemy
        // We should change directions
        private bool ShouldChangeDirection
            => (isMovingRight && (rightWallChecker.IsCollided || !rightGroundChecker.IsCollided)) ||
                (!isMovingRight && (leftWallChecker.IsCollided || !leftGroundChecker.IsCollided));

        protected virtual void Awake()
        {
            movement = gameObject.AddComponent<EnemyMovement>();
            leftWallChecker = GetCollissionCheckerOnChild("Collission Checkers/Left Wall");
            rightWallChecker = GetCollissionCheckerOnChild("Collission Checkers/Right Wall");
            leftGroundChecker = GetCollissionCheckerOnChild("Collission Checkers/Left Ground");
            rightGroundChecker = GetCollissionCheckerOnChild("Collission Checkers/Right Ground");
        }

        protected virtual void FixedUpdate()
        {
            if (ShouldChangeDirection)
                isMovingRight = !isMovingRight;

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

        protected CollissionChecker GetCollissionCheckerOnChild(string childName)
            => transform.Find(childName).GetComponent<CollissionChecker>();
    }
}