using UnityEngine;
using System.Collections;

namespace Pathfinding {
    /** Simple patrol behavior.
     * This will set the destination on the agent so that it moves through the sequence of objects in the #targets array.
     * Upon reaching a target it will wait for #delay seconds.
     *
     * \see #Pathfinding.AIDestinationSetter
     * \see #Pathfinding.AIPath
     * \see #Pathfinding.RichAI
     * \see #Pathfinding.AILerp
     */
    public class Patrol : MonoBehaviour {
        /** Target points to move to in order */
        public Transform[] targets;

        /** Time in seconds to wait at each target */
        public float delay = 0;

        /** Current target index */
        int index;

        IAstarAI agent;
        float switchTime = float.PositiveInfinity;

        void Awake () {
            agent = GetComponent<IAstarAI>();
        }

        /** Update is called once per frame */
        void Update () {
            if (targets.Length == 0) return;

            bool search = false;

            if (agent.reachedEndOfPath && !agent.pathPending && float.IsPositiveInfinity(switchTime)) {
                switchTime = Time.time + delay;
            }

            if (Time.time >= switchTime) {
                index = index + 1;
                search = true;
                switchTime = float.PositiveInfinity;
            }

            index = index % targets.Length;
            agent.destination = targets[index].position;

            if (search) agent.SearchPath();
        }
    }
}