using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.XR.iOS;

public class CatControl : MonoBehaviour {
    public Transform hitTransform;

    Vector3 GetLookVector () {
        Vector3 lookVector =
            Camera.main.transform.position - hitTransform.transform.position;
        lookVector.y = 0.0f; // Y軸の差分は無視する
        lookVector.Normalize ();
        return lookVector;
    }

    bool HitTestWithResultType (ARPoint point, ARHitTestResultType resultTypes) {
        List<ARHitTestResult> hitResults =
            UnityARSessionNativeInterface.GetARSessionNativeInterface ().
                HitTest (point, resultTypes);
        if (hitResults.Count > 0) {
            foreach (var hitResult in hitResults) {
                Debug.Log ("Got hit!");
                hitTransform.position =
                    UnityARMatrixOps.GetPosition (hitResult.worldTransform);
                hitTransform.transform.rotation =
                    Quaternion.LookRotation (GetLookVector());
                return true;
            }
        }
        return false;
    }

    // Use this for initialization
    void Start () {

    }

    // Update is called once per frame
    void Update () {
        if (Input.touchCount > 0 && hitTransform != null) {
            var touch = Input.GetTouch (0);
            if (touch.phase == TouchPhase.Began || touch.phase == TouchPhase.Moved) {
                var screenPosition =
                    Camera.main.ScreenToViewportPoint (touch.position);
                ARPoint point = new ARPoint {
                    x = screenPosition.x,
                    y = screenPosition.y
                };

                // prioritize reults types
                ARHitTestResultType[] resultTypes = {
                    ARHitTestResultType.ARHitTestResultTypeExistingPlaneUsingExtent,
                    // if you want to use infinite planes use this:
                    //ARHitTestResultType.ARHitTestResultTypeExistingPlane,
                    ARHitTestResultType.ARHitTestResultTypeHorizontalPlane,
                    ARHitTestResultType.ARHitTestResultTypeFeaturePoint
                };

                foreach (ARHitTestResultType resultType in resultTypes) {
                    if (HitTestWithResultType (point, resultType)) {
                        return;
                    }
                }
            }
        }
    }
}