using UnityEngine;
using UnityEngine.SceneManagement;
using System;
using System.Collections;
using System.Collections.Generic;
using OpenCVForUnity.ObjdetectModule;
using OpenCVForUnity.CoreModule;
using OpenCVForUnity.ImgprocModule;
using OpenCVForUnity.UnityUtils;

namespace OpenCVForUnityExample
{
    /// <summary>
    /// QRCodeDetector Example
    /// An example of QRCode detection using the QRCodeDetector class.
    /// https://github.com/opencv/opencv/blob/master/samples/cpp/qrcode.cpp
    /// </summary>
    public class QRCodeDetectorExample : MonoBehaviour
    {
        // Use this for initialization
        void Start ()
        {
            Run ();
        }

        private void Run ()
        {
            Texture2D imgTexture = Resources.Load ("link_github_ocv") as Texture2D;

            Mat imgMat = new Mat (imgTexture.height, imgTexture.width, CvType.CV_8UC4);

            Utils.texture2DToMat (imgTexture, imgMat);
            Debug.Log ("imgMat.ToString() " + imgMat.ToString ());


            Mat grayMat = new Mat ();
            Imgproc.cvtColor (imgMat, grayMat, Imgproc.COLOR_RGBA2GRAY);

            Mat points = new Mat ();
            Mat straight_qrcode = new Mat ();

            QRCodeDetector detector = new QRCodeDetector ();

            bool result = detector.detect (grayMat, points);

            if (result) {

                string decode_info = detector.decode (grayMat, points, straight_qrcode);

                Debug.Log (decode_info);
                Debug.Log (points.dump ());
                Debug.Log (straight_qrcode.dump ());

                // draw QRCode contour.
                float[] points_arr = new float[8];
                points.get (0, 0, points_arr);
                Imgproc.line (imgMat, new Point (points_arr [0], points_arr [1]), new Point (points_arr [2], points_arr [3]), new Scalar (255, 0, 0, 255), 2);
                Imgproc.line (imgMat, new Point (points_arr [2], points_arr [3]), new Point (points_arr [4], points_arr [5]), new Scalar (255, 0, 0, 255), 2);
                Imgproc.line (imgMat, new Point (points_arr [4], points_arr [5]), new Point (points_arr [6], points_arr [7]), new Scalar (255, 0, 0, 255), 2);
                Imgproc.line (imgMat, new Point (points_arr [6], points_arr [7]), new Point (points_arr [0], points_arr [1]), new Scalar (255, 0, 0, 255), 2);

                Imgproc.putText (imgMat, "DECODE INFO: " + decode_info, new Point (5, imgMat.rows () - 10), Imgproc.FONT_HERSHEY_SIMPLEX, 0.7, new Scalar (255, 255, 255, 255), 2, Imgproc.LINE_AA, false);
            }

            Texture2D texture = new Texture2D (imgMat.cols (), imgMat.rows (), TextureFormat.RGBA32, false);

            Utils.matToTexture2D (imgMat, texture);

            gameObject.GetComponent<Renderer> ().material.mainTexture = texture;
        }

        // Update is called once per frame
        void Update ()
        {

        }

        /// <summary>
        /// Raises the destroy event.
        /// </summary>
        void OnDestroy ()
        {

        }

        /// <summary>
        /// Raises the back button click event.
        /// </summary>
        public void OnBackButtonClick ()
        {
            SceneManager.LoadScene ("OpenCVForUnityExample");
        }
    }
}