package com.ruoyi.service.impl;

import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.WriterException;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.oned.Code128Writer;
import com.google.zxing.oned.Code39Writer;
import org.krysalis.barcode4j.impl.code128.Code128Bean;
import org.krysalis.barcode4j.output.bitmap.BitmapCanvasProvider;
import org.springframework.stereotype.Service;

import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.lang.reflect.Method;
import java.util.HashMap;
import java.util.Map;

@Service

public class BarcodeService {
    public byte[] generateBarcodeImage(String barcodeText) {
        try {
           // 使用 BitMatrix 生成纯条码，不包含任何文字
            BarcodeFormat format = BarcodeFormat.CODE_128; // 根据您的条码类型

            // 创建编码器
            Code128Writer writer = new Code128Writer();

            // 编码参数
            Map<EncodeHintType, Object> hints = new HashMap<>();
            hints.put(EncodeHintType.MARGIN, 0); // 无边框

            // 生成 BitMatrix（纯条码，无文字）
            BitMatrix matrix = writer.encode(barcodeText, format, 0, 63, hints);

            int width = matrix.getWidth();
            int height = matrix.getHeight();

            // 计算文字区域
            int textAreaHeight = 30 + 10;

            // 创建最终图像
            BufferedImage finalImage = new BufferedImage(
                    width,
                    height + textAreaHeight,
                    BufferedImage.TYPE_BYTE_BINARY
            );

            Graphics2D g2d = finalImage.createGraphics();

            // 白色背景
            g2d.setColor(Color.WHITE);
            g2d.fillRect(0, 0, width, height + textAreaHeight);

            // 绘制条码（从 BitMatrix）
            g2d.setColor(Color.BLACK);
            for (int x = 0; x < width; x++) {
                for (int y = 0; y < height; y++) {
                    if (matrix.get(x, y)) {
                        g2d.fillRect(x, y, 1, 1);
                    }
                }
            }

            // 添加自定义文字
            g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
            g2d.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_ON);
            g2d.setRenderingHint(RenderingHints.KEY_RENDERING, RenderingHints.VALUE_RENDER_QUALITY);
            g2d.setRenderingHint(RenderingHints.KEY_STROKE_CONTROL, RenderingHints.VALUE_STROKE_PURE);

            Font font = new Font("Tahoma", Font.PLAIN, 20);
            g2d.setFont(font);

            FontMetrics fm = g2d.getFontMetrics();
            int textWidth = fm.stringWidth(barcodeText);
            int x = (width - textWidth) / 2;
            int y = height + 30 - 5; // 调整垂直位置

            g2d.drawString(barcodeText, x, y);
            g2d.dispose();

            // 保存
            ByteArrayOutputStream resultStream = new ByteArrayOutputStream();
            ImageIO.write(finalImage, "png", resultStream);

            return resultStream.toByteArray();
         //   return outputStream.toByteArray();
        } catch (IOException e) {
            throw new RuntimeException("Error generating barcode", e);
        } catch (WriterException e) {
            throw new RuntimeException(e);
        }
    }
}