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

namespace OpenCVForUnityExample
{
    /// <summary>
    /// ConnectedComponents Example
    /// An example of Connected-component labeling using the Imgproc.connectedComponentsWithStats function.
    /// Referring to http://qiita.com/wakaba130/items/9d921b8b3eb812e4f197.
    /// </summary>
    public class ConnectedComponentsExample : MonoBehaviour
    {
        // Use this for initialization
        void Start()
        {
            Texture2D imgTexture = Resources.Load("matchshapes") as Texture2D;

            Mat srcMat = new Mat(imgTexture.height, imgTexture.width, CvType.CV_8UC1);

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

            Mat dstMat = new Mat(srcMat.size(), CvType.CV_8UC3);

            // labeling
            Mat labels = new Mat();
            Mat stats = new Mat();
            Mat centroids = new Mat();
            int total = Imgproc.connectedComponentsWithStats(srcMat, labels, stats, centroids);

            Debug.Log("labels.ToString() " + labels.ToString());
            Debug.Log("stats.ToString() " + stats.ToString());
            Debug.Log("centroids.ToString() " + centroids.ToString());
            Debug.Log("total " + total);

            // determine drawing color
            List<Scalar> colors = new List<Scalar>(total);
            colors.Add(new Scalar(0, 0, 0));
            for (int i = 1; i < total; ++i)
            {
                colors.Add(new Scalar(Random.Range(0, 255), Random.Range(0, 255), Random.Range(0, 255)));
            }

            // draw labels
            for (int i = 0; i < dstMat.rows(); ++i)
            {
                for (int j = 0; j < dstMat.cols(); ++j)
                {
                    Scalar color = colors[(int)labels.get(i, j)[0]];
                    dstMat.put(i, j, color.val[0], color.val[1], color.val[2]);
                }
            }

            // draw rectangle
            for (int i = 1; i < total; ++i)
            {

                int x = (int)stats.get(i, Imgproc.CC_STAT_LEFT)[0];
                int y = (int)stats.get(i, Imgproc.CC_STAT_TOP)[0];
                int height = (int)stats.get(i, Imgproc.CC_STAT_HEIGHT)[0];
                int width = (int)stats.get(i, Imgproc.CC_STAT_WIDTH)[0];

                OpenCVForUnity.CoreModule.Rect rect = new OpenCVForUnity.CoreModule.Rect(x, y, width, height);

                Imgproc.rectangle(dstMat, rect.tl(), rect.br(), new Scalar(0, 255, 0), 2);
            }

            // draw centroids
            for (int i = 1; i < total; ++i)
            {

                int x = (int)centroids.get(i, 0)[0];
                int y = (int)centroids.get(i, 1)[0];

                Imgproc.circle(dstMat, new Point(x, y), 3, new Scalar(255, 0, 0), -1);
            }

            // draw index of label
            for (int i = 1; i < total; ++i)
            {

                int x = (int)stats.get(i, Imgproc.CC_STAT_LEFT)[0];
                int y = (int)stats.get(i, Imgproc.CC_STAT_TOP)[0];

                Imgproc.putText(dstMat, "" + i, new Point(x + 5, y + 15), Imgproc.FONT_HERSHEY_COMPLEX, 0.5, new Scalar(255, 255, 0), 2);
            }


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

            Utils.matToTexture2D(dstMat, texture);

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

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

        }

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