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/*
 * Copyright (c) 2018, hiwepy (https://github.com/hiwepy).
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */
package com.google.zxing.spring.boot;

import java.awt.image.BufferedImage;
import java.io.File;

import javax.imageio.ImageIO;

import com.google.zxing.BarcodeFormat;
import com.google.zxing.BinaryBitmap;
import com.google.zxing.LuminanceSource;
import com.google.zxing.MultiFormatReader;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.Result;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.common.HybridBinarizer;
import com.google.zxing.spring.boot.client.BufferedImageLuminanceSource;
import com.google.zxing.spring.boot.client.MatrixToImageWriter;

/**
 * TODO
 * 
 * @author ： wandl
 */

public class ZxingBarCodeTemplate {

	/**
	 * 条形码编码
	 * 
	 * @param contents
	 * @param width
	 * @param height
	 * @param imgPath
	 */
	public void encode(String contents, int width, int height, String imgPath) {
		int codeWidth = 3 + // start guard
				(7 * 6) + // left bars
				5 + // middle guard
				(7 * 6) + // right bars
				3; // end guard
		codeWidth = Math.max(codeWidth, width);
		try {
			BitMatrix bitMatrix = new MultiFormatWriter().encode(contents, BarcodeFormat.EAN_13, codeWidth, height,
					null);

			MatrixToImageWriter.writeToFile(bitMatrix, "png", new File(imgPath));

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

	/**
	 * 条形码解码
	 * 
	 * @param imgPath
	 * @return String
	 */
	public String decode(String imgPath) {
		BufferedImage image = null;
		Result result = null;
		try {
			image = ImageIO.read(new File(imgPath));
			if (image == null) {
				System.out.println("the decode image may be not exit.");
			}
			LuminanceSource source = new BufferedImageLuminanceSource(image);
			BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));

			result = new MultiFormatReader().decode(bitmap, null);
			return result.getText();
		} catch (Exception e) {
			e.printStackTrace();
		}
		return null;
	}

}