using UnityEngine;
using System.Collections;

public class Sucubus : MonoBehaviour {
    public PlayerController _target;
    public GameObject trap;
    public float speed;
    bool beenSeen = false;
    public SucubusState currentState;
    // Use this for initialization
    void Start() {
        currentState = SucubusState.NotSeen;
    }
    public enum SucubusState {
        NotSeen = 0,
        FollowTrap = 2,
        TemptPlayer = 3
    }
    // Update is called once per frame
    void Update() {
        if (_target != null) {
            float distance = Vector2.Distance(_target.transform.position, transform.position);
            switch (currentState) {
                case SucubusState.NotSeen:
                    if (_target != null) {
                        transform.LookAt(_target.transform, transform.up);
                        rigidbody.AddRelativeForce(0, 0, speed, ForceMode.VelocityChange);
                    }
                    break;
                case SucubusState.FollowTrap:
                    transform.LookAt(trap.transform, transform.up);
                    rigidbody.AddRelativeForce(0, 0, speed, ForceMode.VelocityChange);
                    break;
                case SucubusState.TemptPlayer:
                    rigidbody.AddRelativeForce(0, 0, 0, ForceMode.VelocityChange);
                    transform.LookAt(_target.transform, transform.up);
                    break;
            }
            if (currentState != SucubusState.NotSeen) {
                currentState = distance < 2 ? SucubusState.FollowTrap : SucubusState.TemptPlayer;
            }
        }
    }

    void OnTriggerEnter(Collider collider) {
        PlayerController target = collider.GetComponent<PlayerController>();
        if (target != null) {
            if (_target == null) {
                _target = target;
            }
        }
    }
    void OnBecameVisible() {
        if (!beenSeen) {
            currentState = SucubusState.FollowTrap;
        }
    }
}