package com.ruoyi.common.utils;

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.client.j2se.MatrixToImageWriter;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;

/**
 * 二维码生成工具类
 * 
 * @author ruoyi
 */
public class QRCodeUtils {
    
    private static final Logger log = LoggerFactory.getLogger(QRCodeUtils.class);
    
    private static final int WIDTH = 300;
    private static final int HEIGHT = 300;
    private static final String FORMAT = "png";
    
    /**
     * 生成二维码到文件
     * 
     * @param content 二维码内容
     * @param filePath 文件路径
     * @return 是否生成成功
     */
    public static boolean generateQRCodeToFile(String content, String filePath) {
        try {
            Map<EncodeHintType, Object> hints = new HashMap<>();
            hints.put(EncodeHintType.CHARACTER_SET, "UTF-8");
            hints.put(EncodeHintType.MARGIN, 1);
            
            BitMatrix bitMatrix = new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE, WIDTH, HEIGHT, hints);
            
            File file = new File(filePath);
            if (!file.getParentFile().exists()) {
                file.getParentFile().mkdirs();
            }
            
            MatrixToImageWriter.writeToFile(bitMatrix, FORMAT, file);
            return true;
        } catch (Exception e) {
            log.error("生成二维码失败: {}", e.getMessage());
            return false;
        }
    }
    
    /**
     * 生成二维码到字节数组
     * 
     * @param content 二维码内容
     * @return 字节数组
     */
    public static byte[] generateQRCodeToBytes(String content) {
        try {
            Map<EncodeHintType, Object> hints = new HashMap<>();
            hints.put(EncodeHintType.CHARACTER_SET, "UTF-8");
            hints.put(EncodeHintType.MARGIN, 1);
            
            BitMatrix bitMatrix = new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE, WIDTH, HEIGHT, hints);
            
            BufferedImage image = MatrixToImageWriter.toBufferedImage(bitMatrix);
            ByteArrayOutputStream baos = new ByteArrayOutputStream();
            ImageIO.write(image, FORMAT, baos);
            
            return baos.toByteArray();
        } catch (Exception e) {
            log.error("生成二维码失败: {}", e.getMessage());
            return null;
        }
    }
    
    /**
     * 生成Base64编码的二维码
     * 
     * @param content 二维码内容
     * @return Base64编码的二维码
     */
    public static String generateQRCodeToBase64(String content) {
        byte[] bytes = generateQRCodeToBytes(content);
        if (bytes != null) {
            return "data:image/png;base64," + java.util.Base64.getEncoder().encodeToString(bytes);
        }
        return null;
    }

    /**
     * 生成带车牌号的Base64编码二维码
     * 
     * @param content 二维码内容
     * @param vehicleNo 车牌号
     * @return Base64编码的二维码
     */
    public static String generateQRCodeWithVehicleNoToBase64(String content, String vehicleNo) {
        try {
            Map<EncodeHintType, Object> hints = new HashMap<>();
            hints.put(EncodeHintType.CHARACTER_SET, "UTF-8");
            hints.put(EncodeHintType.MARGIN, 1);
            
            BitMatrix bitMatrix = new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE, WIDTH, HEIGHT, hints);
            BufferedImage qrImage = MatrixToImageWriter.toBufferedImage(bitMatrix);
            
            // 创建带文字的图片
            int textHeight = 40; // 文字区域高度
            int totalHeight = HEIGHT + textHeight;
            BufferedImage finalImage = new BufferedImage(WIDTH, totalHeight, BufferedImage.TYPE_INT_RGB);
            Graphics2D g2d = finalImage.createGraphics();
            
            // 设置背景为白色
            g2d.setColor(Color.WHITE);
            g2d.fillRect(0, 0, WIDTH, totalHeight);
            
            // 绘制二维码
            g2d.drawImage(qrImage, 0, 0, null);
            
            // 绘制车牌号文字
            g2d.setColor(Color.BLACK);
            g2d.setFont(new Font("微软雅黑", Font.BOLD, 16));
            FontMetrics fm = g2d.getFontMetrics();
            int textWidth = fm.stringWidth(vehicleNo);
            int x = (WIDTH - textWidth) / 2;
            int y = HEIGHT + (textHeight + fm.getAscent()) / 2;
            g2d.drawString(vehicleNo, x, y);
            
            g2d.dispose();
            
            // 转换为Base64
            ByteArrayOutputStream baos = new ByteArrayOutputStream();
            ImageIO.write(finalImage, FORMAT, baos);
            return "data:image/png;base64," + java.util.Base64.getEncoder().encodeToString(baos.toByteArray());
            
        } catch (Exception e) {
            log.error("生成带车牌号的二维码失败: {}", e.getMessage());
            return null;
        }
    }
}