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

import android.graphics.Bitmap;
import android.graphics.Bitmap.Config;
import android.graphics.BitmapFactory;

/**
 * Image compress factory class
 * 
 * @author 
 *
 */
public class ImageFactory {

	/**
	 * Get bitmap from specified image path
	 * 
	 * @param imgPath
	 * @return
	 */
	public Bitmap getBitmap(String imgPath) {
		// Get bitmap through image path
		BitmapFactory.Options newOpts = new BitmapFactory.Options();
		newOpts.inJustDecodeBounds = false;
		newOpts.inPurgeable = true;
		newOpts.inInputShareable = true;
		// Do not compress
		newOpts.inSampleSize = 1;
		newOpts.inPreferredConfig = Config.RGB_565;
		return BitmapFactory.decodeFile(imgPath, newOpts);
	}
	
	/**
	 * Store bitmap into specified image path
	 * 
	 * @param bitmap
	 * @param outPath
	 * @throws FileNotFoundException 
	 */
	public void storeImage(Bitmap bitmap, String outPath) throws FileNotFoundException {
		FileOutputStream os = new FileOutputStream(outPath);
		bitmap.compress(Bitmap.CompressFormat.JPEG, 100, os);
	}
	
	/**
	 * Compress image by pixel, this will modify image width/height. 
	 * Used to get thumbnail
	 * 
	 * @param imgPath image path
	 * @param pixelW target pixel of width
	 * @param pixelH target pixel of height
	 * @return
	 */
	public Bitmap ratio(String imgPath, float pixelW, float pixelH) {
		BitmapFactory.Options newOpts = new BitmapFactory.Options();  
        // 開始讀入圖片，此時把options.inJustDecodeBounds 設回true，即只讀邊不讀內容
        newOpts.inJustDecodeBounds = true;
        newOpts.inPreferredConfig = Config.RGB_565;
        // Get bitmap info, but notice that bitmap is null now  
        Bitmap bitmap = BitmapFactory.decodeFile(imgPath,newOpts);
          
        newOpts.inJustDecodeBounds = false;  
        int w = newOpts.outWidth;  
        int h = newOpts.outHeight;  
        // 想要縮放的目標尺寸
        float hh = pixelH;// 設定高度為240f時，可以明顯看到圖片縮小了
	    float ww = pixelW;// 設定寬度為120f，可以明顯看到圖片縮小了
        // 縮放比。由於是固定比例縮放，只用高或者寬其中一個數據進行計算即可  
        int be = 1;//be=1表示不縮放  
        if (w > h && w > ww) {//如果寬度大的話根據寬度固定大小縮放  
            be = (int) (newOpts.outWidth / ww);  
        } else if (w < h && h > hh) {//如果高度高的話根據寬度固定大小縮放  
            be = (int) (newOpts.outHeight / hh);  
        }  
        if (be <= 0) be = 1;  
        newOpts.inSampleSize = be;//設定縮放比例
        // 開始壓縮圖片，注意此時已經把options.inJustDecodeBounds 設回false了
        bitmap = BitmapFactory.decodeFile(imgPath, newOpts);
        // 壓縮好比例大小後再進行質量壓縮
//        return compress(bitmap, maxSize); // 這裡再進行質量壓縮的意義不大，反而耗資源，刪除
        return bitmap;
	}
	
	/**
	 * Compress image by size, this will modify image width/height. 
	 * Used to get thumbnail
	 * 
	 * @param image
	 * @param pixelW target pixel of width
	 * @param pixelH target pixel of height
	 * @return
	 */
	public Bitmap ratio(Bitmap image, float pixelW, float pixelH) {
		ByteArrayOutputStream os = new ByteArrayOutputStream();
	    image.compress(Bitmap.CompressFormat.JPEG, 100, os);
	    if( os.toByteArray().length / 1024>1024) {//判斷如果圖片大於1M,進行壓縮避免在生成圖片（BitmapFactory.decodeStream）時溢位    
	        os.reset();//重置baos即清空baos  
	        image.compress(Bitmap.CompressFormat.JPEG, 50, os);//這裡壓縮50%，把壓縮後的資料存放到baos中  
	    }  
	    ByteArrayInputStream is = new ByteArrayInputStream(os.toByteArray());  
	    BitmapFactory.Options newOpts = new BitmapFactory.Options();  
	    //開始讀入圖片，此時把options.inJustDecodeBounds 設回true了  
	    newOpts.inJustDecodeBounds = true;
	    newOpts.inPreferredConfig = Config.RGB_565;
	    Bitmap bitmap = BitmapFactory.decodeStream(is, null, newOpts);  
	    newOpts.inJustDecodeBounds = false;  
	    int w = newOpts.outWidth;  
	    int h = newOpts.outHeight;  
	    float hh = pixelH;// 設定高度為240f時，可以明顯看到圖片縮小了
	    float ww = pixelW;// 設定寬度為120f，可以明顯看到圖片縮小了
	    //縮放比。由於是固定比例縮放，只用高或者寬其中一個數據進行計算即可  
	    int be = 1;//be=1表示不縮放  
	    if (w > h && w > ww) {//如果寬度大的話根據寬度固定大小縮放  
	        be = (int) (newOpts.outWidth / ww);  
	    } else if (w < h && h > hh) {//如果高度高的話根據寬度固定大小縮放  
	        be = (int) (newOpts.outHeight / hh);  
	    }  
	    if (be <= 0) be = 1;  
	    newOpts.inSampleSize = be;//設定縮放比例  
	    //重新讀入圖片，注意此時已經把options.inJustDecodeBounds 設回false了  
	    is = new ByteArrayInputStream(os.toByteArray());  
	    bitmap = BitmapFactory.decodeStream(is, null, newOpts);
	    //壓縮好比例大小後再進行質量壓縮
//	    return compress(bitmap, maxSize); // 這裡再進行質量壓縮的意義不大，反而耗資源，刪除
	    return bitmap;
	}
	
	/**
	 * Compress by quality,  and generate image to the path specified
	 * 
	 * @param image
	 * @param outPath
	 * @param maxSize target will be compressed to be smaller than this size.(kb)
	 * @throws IOException 
	 */
	public void compressAndGenImage(Bitmap image, String outPath, int maxSize) throws IOException {
		ByteArrayOutputStream os = new ByteArrayOutputStream();
		// scale
		int options = 100;
		// Store the bitmap into output stream(no compress)
        image.compress(Bitmap.CompressFormat.JPEG, options, os);  
        // Compress by loop
        while ( os.toByteArray().length / 1024 > maxSize) {
            // Clean up os
        	os.reset();
        	// interval 10
            options -= 10;
            image.compress(Bitmap.CompressFormat.JPEG, options, os);
        }
        
        // Generate compressed image file
        FileOutputStream fos = new FileOutputStream(outPath);  
        fos.write(os.toByteArray());  
        fos.flush();  
        fos.close();  
	}
	
	/**
	 * Compress by quality,  and generate image to the path specified
	 * 
	 * @param imgPath
	 * @param outPath
	 * @param maxSize target will be compressed to be smaller than this size.(kb)
	 * @param needsDelete Whether delete original file after compress
	 * @throws IOException 
	 */
	public void compressAndGenImage(String imgPath, String outPath, int maxSize, boolean needsDelete) throws IOException {
		compressAndGenImage(getBitmap(imgPath), outPath, maxSize);
		
		// Delete original file
		if (needsDelete) {
			File file = new File (imgPath);
			if (file.exists()) {
				file.delete();
			}
		}
	}
	
	/**
	 * Ratio and generate thumb to the path specified
	 * 
	 * @param image
	 * @param outPath
	 * @param pixelW target pixel of width
	 * @param pixelH target pixel of height
	 * @throws FileNotFoundException
	 */
	public void ratioAndGenThumb(Bitmap image, String outPath, float pixelW, float pixelH) throws FileNotFoundException {
		Bitmap bitmap = ratio(image, pixelW, pixelH);
		storeImage( bitmap, outPath);
	}
	
	/**
	 * Ratio and generate thumb to the path specified
	 * 
	 * @param image
	 * @param outPath
	 * @param pixelW target pixel of width
	 * @param pixelH target pixel of height
	 * @param needsDelete Whether delete original file after compress
	 * @throws FileNotFoundException
	 */
	public void ratioAndGenThumb(String imgPath, String outPath, float pixelW, float pixelH, boolean needsDelete) throws FileNotFoundException {
		Bitmap bitmap = ratio(imgPath, pixelW, pixelH);
		storeImage( bitmap, outPath);
		
		// Delete original file
				if (needsDelete) {
					File file = new File (imgPath);
					if (file.exists()) {
						file.delete();
					}
				}
	}
	
}
 

    /**
     * 質量壓縮方法
     *
     * @param image
     * @return
     */
    public static Bitmap compressImage(Bitmap image) {

        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        image.compress(Bitmap.CompressFormat.JPEG, 100, baos);// 質量壓縮方法，這裡100表示不壓縮，把壓縮後的資料存放到baos中
        int options = 90;

        while (baos.toByteArray().length / 1024 > 100) { // 迴圈判斷如果壓縮後圖片是否大於100kb,大於繼續壓縮
            baos.reset(); // 重置baos即清空baos
            image.compress(Bitmap.CompressFormat.JPEG, options, baos);// 這裡壓縮options%，把壓縮後的資料存放到baos中
            options -= 10;// 每次都減少10
        }
        ByteArrayInputStream isBm = new ByteArrayInputStream(baos.toByteArray());// 把壓縮後的資料baos存放到ByteArrayInputStream中
        Bitmap bitmap = BitmapFactory.decodeStream(isBm, null, null);// 把ByteArrayInputStream資料生成圖片
        return bitmap;
    }