package com.beelphegor.cordovacamscanner;

import java.io.File;
import java.io.IOException;

import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Matrix;
import android.media.ExifInterface;
import android.text.TextUtils;

public class Util {

	/**
	 * check directory whether exist, if not then make one;
	 * @param path absolute path of directory
	 * @return
	 */
	public static boolean checkDir(String path) {
		boolean result = true;
		File f = new File(path);
		if (!f.exists()){
			result = f.mkdirs();
		}else if (f.isFile()) {
			f.delete();
			result = f.mkdirs();
		}
		return result;
	}

	public static Bitmap loadBitmap(String path) {
		BitmapFactory.Options options = new BitmapFactory.Options();
		Bitmap b = null;
		try {
			options.inSampleSize = 1;
			options.inJustDecodeBounds = true;
			BitmapFactory.decodeFile(path, options);
			if (options.mCancel || options.outWidth == -1
					|| options.outHeight == -1) {
				return null;
			}
			options.inSampleSize = 2;
			options.inJustDecodeBounds = false;
			options.inDither = false;
			options.inPreferredConfig = Bitmap.Config.RGB_565;
			b = BitmapFactory.decodeFile(path, options);
			if(b==null)
				return null;

			int orientation=getOrientation(path);
			if(orientation!=1){
				Matrix m = new Matrix();
				m.postRotate(getRotation(orientation));
				b = Bitmap.createBitmap(b, 0, 0, b.getWidth(), b.getHeight(), m, false);
			}

		} catch (OutOfMemoryError ex) {
			ex.printStackTrace();
			System.gc();
		} catch (Exception e) {
			e.printStackTrace();
		}
		return b;
	}

	/**
	 * get rotation degrees
	 * @param orientation values in {1, 3, 6, 8}
	 * @return values in {0, 90, 180, 270}
	 */
	private static int getRotation(int orientation){
		switch(orientation){
		case 1:
			return 0;
		case 8:
			return 270;
		case 3:
			return 180;
		case 6:
			return 90;
		default :
			return 0;
		}
	}
	/**
	 * read orientation from Image file
	 * @param file
	 * @return
	 */
	private static int getOrientation(String file){
		int orientation=1;
		ExifInterface exif;
		if(!TextUtils.isEmpty(file)){
			try {
				exif = new ExifInterface(file);
				orientation=exif.getAttributeInt(ExifInterface.TAG_ORIENTATION, 1);
			} catch (IOException e) {
				e.printStackTrace();
			}catch(ExceptionInInitializerError e){
				e.printStackTrace();
			}
		}
		return orientation;
	}
}