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import android.annotation.SuppressLint;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Matrix;
import android.graphics.Paint;
import android.os.AsyncTask;

import androidx.exifinterface.media.ExifInterface;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;

public class ImageCompression extends AsyncTask<String, Void, String> {
    private final String filePath;
    private final ImageCompressionListener imageCompressionListener;

    @SuppressLint("StaticFieldLeak")
    private final Context context;
    private static final float maxHeight = 1280.0f;
    private static final float maxWidth = 1280.0f;


    public ImageCompression(Context context, String filePath, ImageCompressionListener imageCompressionListener) {
        this.context = context;
        this.filePath = filePath;
        this.imageCompressionListener = imageCompressionListener;
    }

    @Override
    protected void onPreExecute() {
        super.onPreExecute();
        imageCompressionListener.onStart();
    }

    @Override
    protected String doInBackground(String... strings) {
        //if (strings.length == 0 || strings[0] == null)
        //return null;

        return compressImage(filePath);
    }

    protected void onPostExecute(String imagePath) {
        // imagePath is path of new compressed image.
        imageCompressionListener.onCompressed(imagePath);
    }


    private String compressImage(String imagePath) {
        Bitmap scaledBitmap = null;

        BitmapFactory.Options options = new BitmapFactory.Options();
        options.inJustDecodeBounds = true;
        Bitmap bmp = BitmapFactory.decodeFile(imagePath, options);

        int actualHeight = options.outHeight;
        int actualWidth = options.outWidth;

        float imgRatio = (float) actualWidth / (float) actualHeight;
        float maxRatio = maxWidth / maxHeight;

        if (actualHeight > maxHeight || actualWidth > maxWidth) {
            if (imgRatio < maxRatio) {
                imgRatio = maxHeight / actualHeight;
                actualWidth = (int) (imgRatio * actualWidth);
                actualHeight = (int) maxHeight;
            } else if (imgRatio > maxRatio) {
                imgRatio = maxWidth / actualWidth;
                actualHeight = (int) (imgRatio * actualHeight);
                actualWidth = (int) maxWidth;
            } else {
                actualHeight = (int) maxHeight;
                actualWidth = (int) maxWidth;
            }
        }

        options.inSampleSize = calculateInSampleSize(options, actualWidth, actualHeight);
        options.inJustDecodeBounds = false;
        options.inDither = false;
        options.inPurgeable = true;
        options.inInputShareable = true;
        options.inTempStorage = new byte[16 * 1024];

        try {
            bmp = BitmapFactory.decodeFile(imagePath, options);
        } catch (OutOfMemoryError exception) {
            exception.printStackTrace();

        }
        try {
            scaledBitmap = Bitmap.createBitmap(actualWidth, actualHeight, Bitmap.Config.RGB_565);
        } catch (OutOfMemoryError exception) {
            exception.printStackTrace();
        }

        float ratioX = actualWidth / (float) options.outWidth;
        float ratioY = actualHeight / (float) options.outHeight;
        float middleX = actualWidth / 2.0f;
        float middleY = actualHeight / 2.0f;

        Matrix scaleMatrix = new Matrix();
        scaleMatrix.setScale(ratioX, ratioY, middleX, middleY);

        Canvas canvas = new Canvas(scaledBitmap);
        canvas.setMatrix(scaleMatrix);
        canvas.drawBitmap(bmp, middleX - bmp.getWidth() / 2, middleY - bmp.getHeight() / 2, new Paint(Paint.FILTER_BITMAP_FLAG));

        bmp.recycle();

        ExifInterface exif;
        try {
            exif = new ExifInterface(imagePath);
            int orientation = exif.getAttributeInt(ExifInterface.TAG_ORIENTATION, 0);
            Matrix matrix = new Matrix();
            switch (orientation) {
                case 6:
                    matrix.postRotate(90);
                    break;
                case 3:
                    matrix.postRotate(180);
                    break;
                case 8:
                    matrix.postRotate(270);
                    break;
            }
            scaledBitmap = Bitmap.createBitmap(scaledBitmap, 0, 0, scaledBitmap.getWidth(), scaledBitmap.getHeight(), matrix, true);
        } catch (IOException e) {
            e.printStackTrace();
        }
        FileOutputStream out;
        String filepath = getFilename();
        try {
            out = new FileOutputStream(filepath);

            //write the compressed bitmap at the destination specified by filename.
            scaledBitmap.compress(Bitmap.CompressFormat.JPEG, 80, out);

        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }

        return filepath;
    }

    private static int calculateInSampleSize(BitmapFactory.Options options, int reqWidth, int reqHeight) {
        final int height = options.outHeight;
        final int width = options.outWidth;
        int inSampleSize = 1;

        if (height > reqHeight || width > reqWidth) {
            final int heightRatio = Math.round((float) height / (float) reqHeight);
            final int widthRatio = Math.round((float) width / (float) reqWidth);
            inSampleSize = heightRatio < widthRatio ? heightRatio : widthRatio;
        }
        final float totalPixels = width * height;
        final float totalReqPixelsCap = reqWidth * reqHeight * 2;

        while (totalPixels / (inSampleSize * inSampleSize) > totalReqPixelsCap) {
            inSampleSize++;
        }

        return inSampleSize;
    }

    private String getFilename() {

        File mediaStorageDir = new File(context.getExternalFilesDir(""), "compressed");

        //File mediaStorageDir = new File(Environment.getExternalStorageDirectory() + "/Compressed");

        // Create the storage directory if it does not exist
        if (!mediaStorageDir.exists()) {
            mediaStorageDir.mkdirs();
        }

        String mImageName = "IMG_" + String.valueOf(System.currentTimeMillis()) + ".png";
        return mediaStorageDir.getAbsolutePath() + "/" + mImageName;

    }
}

class ImageUtil {

    private ImageUtil() {

    }

    static File compressImage(File imageFile, float reqWidth, float reqHeight, Bitmap.CompressFormat compressFormat, int quality, String destinationPath) throws IOException {
        FileOutputStream fileOutputStream = null;
        File file = new File(destinationPath).getParentFile();
        if (!file.exists()) {
            file.mkdirs();
        }
        try {
            fileOutputStream = new FileOutputStream(destinationPath);
            // write the compressed bitmap at the destination specified by destinationPath.
            decodeSampledBitmapFromFile(imageFile, reqWidth, reqHeight).compress(compressFormat, quality, fileOutputStream);
        } finally {
            if (fileOutputStream != null) {
                fileOutputStream.flush();
                fileOutputStream.close();
            }
        }

        return new File(destinationPath);
    }

    static Bitmap decodeSampledBitmapFromFile(File imageFile, float reqWidth, float reqHeight) throws IOException {
        // First decode with inJustDecodeBounds=true to check dimensions

        Bitmap scaledBitmap = null, bmp = null;

        BitmapFactory.Options options = new BitmapFactory.Options();
        options.inJustDecodeBounds = true;
        bmp = BitmapFactory.decodeFile(imageFile.getAbsolutePath(), options);

        int actualHeight = options.outHeight;
        int actualWidth = options.outWidth;

        float imgRatio = (float) actualWidth / (float) actualHeight;
        float maxRatio = reqWidth / reqHeight;

        if (actualHeight > reqHeight || actualWidth > reqWidth) {
            //If Height is greater
            if (imgRatio < maxRatio) {
                imgRatio = reqHeight / actualHeight;
                actualWidth = (int) (imgRatio * actualWidth);
                actualHeight = (int) reqHeight;

            }  //If Width is greater
            else if (imgRatio > maxRatio) {
                imgRatio = reqWidth / actualWidth;
                actualHeight = (int) (imgRatio * actualHeight);
                actualWidth = (int) reqWidth;
            } else {
                actualHeight = (int) reqHeight;
                actualWidth = (int) reqWidth;
            }
        }

        // Calculate inSampleSize
        options.inSampleSize = calculateInSampleSize(options, actualWidth, actualHeight);
        options.inJustDecodeBounds = false;
        options.inDither = false;
        options.inPurgeable = true;
        options.inInputShareable = true;
        options.inTempStorage = new byte[16 * 1024];

        try {
            bmp = BitmapFactory.decodeFile(imageFile.getAbsolutePath(), options);
        } catch (OutOfMemoryError exception) {
            exception.printStackTrace();

        }
        try {
            scaledBitmap = Bitmap.createBitmap(actualWidth, actualHeight, Bitmap.Config.ARGB_8888);
        } catch (OutOfMemoryError exception) {
            exception.printStackTrace();
        }

        float ratioX = actualWidth / (float) options.outWidth;
        float ratioY = actualHeight / (float) options.outHeight;
        float middleX = actualWidth / 2.0f;
        float middleY = actualHeight / 2.0f;

        Matrix scaleMatrix = new Matrix();
        scaleMatrix.setScale(ratioX, ratioY, middleX, middleY);

        Canvas canvas = new Canvas(scaledBitmap);
        canvas.setMatrix(scaleMatrix);
        canvas.drawBitmap(bmp, middleX - bmp.getWidth() / 2,
                middleY - bmp.getHeight() / 2, new Paint(Paint.FILTER_BITMAP_FLAG));
        bmp.recycle();
        ExifInterface exif;
        try {
            exif = new ExifInterface(imageFile.getAbsolutePath());
            int orientation = exif.getAttributeInt(ExifInterface.TAG_ORIENTATION, 0);
            Matrix matrix = new Matrix();
            if (orientation == 6) {
                matrix.postRotate(90);
            } else if (orientation == 3) {
                matrix.postRotate(180);
            } else if (orientation == 8) {
                matrix.postRotate(270);
            }
            scaledBitmap = Bitmap.createBitmap(scaledBitmap, 0, 0, scaledBitmap.getWidth(),
                    scaledBitmap.getHeight(), matrix, true);
        } catch (IOException e) {
            e.printStackTrace();
        }

        return scaledBitmap;


    }

    private static int calculateInSampleSize(BitmapFactory.Options options, int reqWidth, int reqHeight) {
        // Raw height and width of image
        final int height = options.outHeight;
        final int width = options.outWidth;
        int inSampleSize = 1;

        if (height > reqHeight || width > reqWidth) {
            inSampleSize *= 2;
            final int halfHeight = height / 2;
            final int halfWidth = width / 2;

            // Calculate the largest inSampleSize value that is a power of 2 and keeps both
            // height and width larger than the requested height and width.
            while ((halfHeight / inSampleSize) >= reqHeight && (halfWidth / inSampleSize) >= reqWidth) {
                inSampleSize *= 2;
            }
        }

        return inSampleSize;
    }
}