using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.AI;

public class WorldInteraction : MonoBehaviour {
    //declare variable here so it's avaibable to the whole class
    NavMeshAgent playerAgent;

    void Start()
    {
        // When initiated, set playerAgent to NavMeshAgent (a component for pathfinding)
        playerAgent = GetComponent<NavMeshAgent> (); //get the NavMeshAgent for the object this script is attatched to
    }

    void Update () {
        if (Input.GetMouseButtonDown (0)) {
            MoveCamera (); //call this when you click the mouse
        }
    }

    void MoveCamera()
    {
        // Think ray of sunshine
        // Creates a Ray from the Main camera to the mouse position (when clicked)
        Ray cameraRay = Camera.main.ScreenPointToRay (Input.mousePosition);

        //creates new RayCastHit object to get info from raycast
        RaycastHit cameraInfo;

        // check for collisions in the Ray
        // out means the arg has no value but will be defined by the method

        // Basically Physics.Raycast starts from the camera to the mouse
        // It uses info from the Raycase (camera info) to check for any collisions
        // to make a new game object with the object the Ray collided with
        // If the object has an Interactive Object tag, it calls the Interactable script
        // (which is a component) and then calls the MoveToInteraction method, passing the player
        // in as an argument
        if (Physics.Raycast (cameraRay, out cameraInfo, Mathf.Infinity))
        {
            GameObject interactedObject = cameraInfo.collider.gameObject;
            if (interactedObject.tag == "Interactable Object") {
                //work with the Interactable script on this object
                interactedObject.GetComponent<Interactable> ().MoveToInteraction (playerAgent);
            }
            else
            {
                playerAgent.stoppingDistance = 0;
                playerAgent.destination = cameraInfo.point;
            }
        }
    }
}