using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.VR.WSA.Persistence;
using UnityEngine.VR.WSA;

// Additional Readings:
// Unity has a website dedicated to Hololens, you should check it out!
// https://unity3d.com/partners/microsoft/hololens

// Even more reading:
// https://forums.hololens.com/discussion/514/creating-and-assigning-spatial-anchors

public class WorldAnchorStore : MonoBehaviour {

    WorldAnchorStore anchorStore;
    public string anchorStoreName;

    // This function condenses the loading of anchors into
    // gameobject and the store together.
    private void StoreLoaded(WorldAnchorStore store)
    {
       // We load the anchor store...
       anchorStore = store;
       // Load all of the IDs into an array of strings
       string[] ids = anchorStore.GetAllIds();
       // Loop through the entire array to find the object we want to load.
       for(int i = 0; i < ids.Length(); ++i)
       {
         if(ids[i] == anchorStoreName)
         {
           // Calling the load function should load the anchor onto
           // the gameobject.
           WorldAnchor results = anchorStore.Load(ids[i], this.gameObject);
           if(!results)
             Debug.Log("Loaded has failed for some reasons...");
           break;
         }
       }
    }

    // This function is called automatically when this script loads.
    void Start ()
    {
      // Function is called to run StoreLoaded.
       WorldAnchorStore.GetAsync(StoreLoaded);
    }

    // Use this function to perform any changes to the object.
    void Update ()
    {
       // E.g changing the movement
       // gameObject.transform.x += Time.deltaTime * speedFactor;
    }

    // Call this function when you want to save the anchor of the
    // game object!
    private void SaveAnchor()
    {
      WorldAnchor anchorToAttach = gameObject.AddComponent<WorldAnchor>();
      bool results = anchorStore.Saved(anchorStoreName, anchorToAttach);
      if(results == false)
      {
        Debug.Log("Attaching/Saving of anchor has failed!");
      }
    }
}