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

namespace OpenCVForUnityExample
{
    /// <summary>
    /// Face Detection WebCam Example
    /// An example of detecting human face in a image of WebCamTexture using the CascadeClassifier class.
    /// http://docs.opencv.org/3.2.0/db/d28/tutorial_cascade_classifier.html
    /// </summary>
    [RequireComponent(typeof(WebCamTextureToMatHelper))]
    public class FaceDetectionWebCamExample : MonoBehaviour
    {
        /// <summary>
        /// The gray mat.
        /// </summary>
        Mat grayMat;

        /// <summary>
        /// The texture.
        /// </summary>
        Texture2D texture;

        /// <summary>
        /// The cascade.
        /// </summary>
        CascadeClassifier cascade;

        /// <summary>
        /// The faces.
        /// </summary>
        MatOfRect faces;

        /// <summary>
        /// The webcam texture to mat helper.
        /// </summary>
        WebCamTextureToMatHelper webCamTextureToMatHelper;

        /// <summary>
        /// The FPS monitor.
        /// </summary>
        FpsMonitor fpsMonitor;

        /// <summary>
        /// LBP_CASCADE_FILENAME
        /// </summary>
        protected static readonly string LBP_CASCADE_FILENAME = "OpenCVForUnity/objdetect/lbpcascade_frontalface.xml";

#if UNITY_WEBGL
        IEnumerator getFilePath_Coroutine;
#endif

        // Use this for initialization
        void Start()
        {
            fpsMonitor = GetComponent<FpsMonitor>();

            webCamTextureToMatHelper = gameObject.GetComponent<WebCamTextureToMatHelper>();

#if UNITY_WEBGL
            getFilePath_Coroutine = Utils.getFilePathAsync (LBP_CASCADE_FILENAME, (result) => {
                getFilePath_Coroutine = null;

                if (string.IsNullOrEmpty(result))
                {
                    Debug.LogError(LBP_CASCADE_FILENAME + " is not loaded. Please move from “OpenCVForUnity/StreamingAssets/OpenCVForUnity/” to “Assets/StreamingAssets/OpenCVForUnity/” folder.");
                }
                else
                {
                    cascade = new CascadeClassifier(result);
                }

                webCamTextureToMatHelper.Initialize ();
            });
            StartCoroutine (getFilePath_Coroutine);
#else

            string cascade_filepath = Utils.getFilePath(LBP_CASCADE_FILENAME);
            if (string.IsNullOrEmpty(cascade_filepath))
            {
                Debug.LogError(LBP_CASCADE_FILENAME + " is not loaded. Please move from “OpenCVForUnity/StreamingAssets/OpenCVForUnity/” to “Assets/StreamingAssets/OpenCVForUnity/” folder.");
            }
            else
            {
                cascade = new CascadeClassifier(cascade_filepath);
            }

#if UNITY_ANDROID && !UNITY_EDITOR
            // Avoids the front camera low light issue that occurs in only some Android devices (e.g. Google Pixel, Pixel2).
            webCamTextureToMatHelper.avoidAndroidFrontCameraLowLightIssue = true;
#endif
            webCamTextureToMatHelper.Initialize();

#endif
        }

        /// <summary>
        /// Raises the web cam texture to mat helper initialized event.
        /// </summary>
        public void OnWebCamTextureToMatHelperInitialized()
        {
            Debug.Log("OnWebCamTextureToMatHelperInitialized");

            Mat webCamTextureMat = webCamTextureToMatHelper.GetMat();

            texture = new Texture2D(webCamTextureMat.cols(), webCamTextureMat.rows(), TextureFormat.RGBA32, false);
            Utils.matToTexture2D(webCamTextureMat, texture);

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

            gameObject.transform.localScale = new Vector3(webCamTextureMat.cols(), webCamTextureMat.rows(), 1);
            Debug.Log("Screen.width " + Screen.width + " Screen.height " + Screen.height + " Screen.orientation " + Screen.orientation);

            if (fpsMonitor != null)
            {
                fpsMonitor.Add("width", webCamTextureMat.width().ToString());
                fpsMonitor.Add("height", webCamTextureMat.height().ToString());
                fpsMonitor.Add("orientation", Screen.orientation.ToString());
            }


            float width = webCamTextureMat.width();
            float height = webCamTextureMat.height();

            float widthScale = (float)Screen.width / width;
            float heightScale = (float)Screen.height / height;
            if (widthScale < heightScale)
            {
                Camera.main.orthographicSize = (width * (float)Screen.height / (float)Screen.width) / 2;
            }
            else
            {
                Camera.main.orthographicSize = height / 2;
            }

            grayMat = new Mat(webCamTextureMat.rows(), webCamTextureMat.cols(), CvType.CV_8UC1);

            faces = new MatOfRect();
        }

        /// <summary>
        /// Raises the web cam texture to mat helper disposed event.
        /// </summary>
        public void OnWebCamTextureToMatHelperDisposed()
        {
            Debug.Log("OnWebCamTextureToMatHelperDisposed");

            if (grayMat != null)
                grayMat.Dispose();

            if (texture != null)
            {
                Texture2D.Destroy(texture);
                texture = null;
            }

            if (faces != null)
                faces.Dispose();
        }

        /// <summary>
        /// Raises the web cam texture to mat helper error occurred event.
        /// </summary>
        /// <param name="errorCode">Error code.</param>
        public void OnWebCamTextureToMatHelperErrorOccurred(WebCamTextureToMatHelper.ErrorCode errorCode)
        {
            Debug.Log("OnWebCamTextureToMatHelperErrorOccurred " + errorCode);
        }

        // Update is called once per frame
        void Update()
        {
            if (webCamTextureToMatHelper.IsPlaying() && webCamTextureToMatHelper.DidUpdateThisFrame())
            {

                Mat rgbaMat = webCamTextureToMatHelper.GetMat();

                if (cascade == null)
                {
                    Imgproc.putText(rgbaMat, "model file is not loaded.", new Point(5, rgbaMat.rows() - 30), Imgproc.FONT_HERSHEY_SIMPLEX, 0.7, new Scalar(255, 255, 255, 255), 2, Imgproc.LINE_AA, false);
                    Imgproc.putText(rgbaMat, "Please read console message.", new Point(5, rgbaMat.rows() - 10), Imgproc.FONT_HERSHEY_SIMPLEX, 0.7, new Scalar(255, 255, 255, 255), 2, Imgproc.LINE_AA, false);

                    Utils.matToTexture2D(rgbaMat, texture);
                    return;
                }


                Imgproc.cvtColor(rgbaMat, grayMat, Imgproc.COLOR_RGBA2GRAY);
                Imgproc.equalizeHist(grayMat, grayMat);


                if (cascade != null)
                    cascade.detectMultiScale(grayMat, faces, 1.1, 2, 2, // TODO: objdetect.CV_HAAR_SCALE_IMAGE
                        new Size(grayMat.cols() * 0.2, grayMat.rows() * 0.2), new Size());


                OpenCVForUnity.CoreModule.Rect[] rects = faces.toArray();
                for (int i = 0; i < rects.Length; i++)
                {
                    //Debug.Log ("detect faces " + rects [i]);

                    Imgproc.rectangle(rgbaMat, new Point(rects[i].x, rects[i].y), new Point(rects[i].x + rects[i].width, rects[i].y + rects[i].height), new Scalar(255, 0, 0, 255), 2);
                }

                //Imgproc.putText (rgbaMat, "W:" + rgbaMat.width () + " H:" + rgbaMat.height () + " SO:" + Screen.orientation, new Point (5, rgbaMat.rows () - 10), Imgproc.FONT_HERSHEY_SIMPLEX, 1.0, new Scalar (255, 255, 255, 255), 2, Imgproc.LINE_AA, false);

                Utils.matToTexture2D(rgbaMat, texture);
            }
        }

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

            if (cascade != null)
                cascade.Dispose();

#if UNITY_WEBGL
            if (getFilePath_Coroutine != null) {
                StopCoroutine (getFilePath_Coroutine);
                ((IDisposable)getFilePath_Coroutine).Dispose ();
            }
#endif
        }

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

        /// <summary>
        /// Raises the play button click event.
        /// </summary>
        public void OnPlayButtonClick()
        {
            webCamTextureToMatHelper.Play();
        }

        /// <summary>
        /// Raises the pause button click event.
        /// </summary>
        public void OnPauseButtonClick()
        {
            webCamTextureToMatHelper.Pause();
        }

        /// <summary>
        /// Raises the stop button click event.
        /// </summary>
        public void OnStopButtonClick()
        {
            webCamTextureToMatHelper.Stop();
        }

        /// <summary>
        /// Raises the change camera button click event.
        /// </summary>
        public void OnChangeCameraButtonClick()
        {
            webCamTextureToMatHelper.requestedIsFrontFacing = !webCamTextureToMatHelper.requestedIsFrontFacing;
        }
    }
}