package com.yeejoin.amos.patrol.business.util;

import java.awt.image.BufferedImage;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.util.Date;
import java.util.Hashtable;
import java.util.Random;

import javax.imageio.ImageIO;

import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;
/**
 * 二维码工具类
 * @author Administrator
 *
 */
public class QRCodeUtil {

	private static Random random = new Random();
	
	private static final String CHARSET = "utf-8";  
	
	private static final String PREFIX_EQUIPMENT = "AMOS#PATROL#01#";  //平台#子系统#分类编码#
	
	private static final int QRCODE_SIZE = 45;
	
	/**
	 * 
	 * <pre>
	 * 根据当前记录ID生成QRCode
	 * </pre>
	 *
	 * @param id
	 * @return
	 */
	public static String generateQRCode(Date dateCreated, String pointNo)
	{
		return String.valueOf(dateCreated.getTime() + pointNo);
	}
	
	/**
	 * 生成临时的qrCode
	 * 
	 * @return
	 */
	public static String temporaryQrCode() {
		long qrCode = -1 * System.currentTimeMillis();
		qrCode += (long)(random.nextDouble() * 10000000);
		return String.valueOf(qrCode);
	}
	
	/**
	 * 根据二维码信息，生成二维码图片 用户excel，word等导出图片
	 * 
	 * @param content
	 * @return
	 */
	public static byte[] generateQRCodeImageByteData(String content) {
		ByteArrayOutputStream out = new ByteArrayOutputStream();
		try {
			Hashtable<EncodeHintType, Object> hints = new Hashtable<EncodeHintType, Object>();  
	        hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);  
	        hints.put(EncodeHintType.CHARACTER_SET, CHARSET);  
	        hints.put(EncodeHintType.MARGIN, 1);  
	        BitMatrix bitMatrix = new MultiFormatWriter().encode(
	        		/*PREFIX_EQUIPMENT + */content
	        		, BarcodeFormat.QR_CODE
	        		, QRCODE_SIZE
	        		, QRCODE_SIZE,  
	                hints);  
	        int width = bitMatrix.getWidth();  
	        int height = bitMatrix.getHeight();  
	        BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);  
	        for (int x = 0; x < width; x++) {  
	            for (int y = 0; y < height; y++) {  
	                image.setRGB(x, y, bitMatrix.get(x, y) ? 0xFF000000 : 0xFFFFFFFF);  
	            }  
	        }  
	        ImageIO.write(image, "png", out);
	        return out.toByteArray();
		} catch (Exception e) {
			e.printStackTrace();
		} finally {
			try {
				out.close();
			} catch (IOException e) {
				e.printStackTrace();
			}
		}
		return null;
	}
}
