using System.Linq;
using UnityEngine;
using System.Collections;



public class AiFindEnemy : AiBehavior {

    private GameObject obj;
    private PlayerSensor sensor;
    private HumanController selfController;
    public LayerMask skipMask;
   
    protected override void OnBegin(AiBlackboard blackboard) {
        base.OnBegin(blackboard);
        if (obj == null) {
            obj = blackboard.Obj;
            sensor = obj.GetComponent<HumanoidAI>().viewSensor;
            selfController = obj.GetComponent<HumanController>();
        }
    }

    protected override BehaviorStatus OnExecute(AiBlackboard blackboard) {
       
        bool playerInCone = sensor.Player != null;
        if (playerInCone) {
            var enemyEyes = sensor.Player.eyes.transform.position;
            var selfEyes = selfController.eyes.transform.position;

            var from = new Vector3[] { selfEyes, selfEyes };
            var to = new Vector3[] { enemyEyes, sensor.Player.transform.position };

            for (int i = 0; i < 2; ++i) {
                Debug.DrawLine(from[i], to[i], Color.gray);
            }

            for (int i = 0; i < 2; ++i) {
                if (RaycastEnemy(from[i], to[i])) {
                    blackboard.SetValue(BlackboardVariables.Enemy, sensor.Player);
                    blackboard.SetValue(BlackboardVariables.LastEnemyPosition, sensor.Player.transform.position);

                    //Debug.Log("Raycast OK");
                    return BehaviorStatus.Success;
                }
            }
          //  Debug.Log("Raycast FAIL");
        }

        blackboard.SetValue(BlackboardVariables.Enemy, null);
       
        return BehaviorStatus.Fail;
    }

    private bool RaycastEnemy(Vector3 from, Vector3 to) {
        var hits = Physics2D.RaycastAll(from, (to - from).normalized, 100, (Physics2D.DefaultRaycastLayers & (~skipMask.value)));

        //find first collision which is not inside player head
        int firstOutsideId = -1;
        for (int i = 0; i < hits.Length; ++i) {
            if (hits[i].fraction > 0.0f) {
                firstOutsideId = i;
                break;
            }
        }

        if (firstOutsideId >= 0) {
            var hit = hits[firstOutsideId];
            var g = hit.collider.GetComponent<PlayerController>();
            if (g != null) {
                return true;
            }
        }
        return false;
    }
}