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 {
    /**
     * 添加文字到条码（优化版本）
     */
    private void addTextToBarcode(Graphics2D g2d, String text, int width, int barcodeHeight) {
        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);

        // 使用更清晰的字体
        Font font = new Font("Tahoma", Font.PLAIN, 45);
        g2d.setFont(font);
        g2d.setColor(Color.BLACK);

        // 计算文字位置
        FontMetrics fm = g2d.getFontMetrics();
        int textWidth = fm.stringWidth(text);
        int textHeight = fm.getHeight();

        // 居中对齐
        int x = (width - textWidth) / 2;
        int y = barcodeHeight + textHeight - fm.getDescent(); // 精确垂直居中

        // 绘制文字
        g2d.drawString(text, x, y);
    }
    public byte[] generateBarcodeImage(String barcodeText)   {
        try {
            BarcodeFormat format = BarcodeFormat.CODE_39;
            Code39Writer writer = new Code39Writer();

            // 编码参数 - 设置边距为0
            Map<EncodeHintType, Object> hints = new HashMap<>();
            hints.put(EncodeHintType.MARGIN, 0); // 关键：设置边距为0

            // 生成 BitMatrix（纯条码，无文字）
            // 注意：即使设置了MARGIN=0，ZXing可能仍会保留最小边距
            BitMatrix matrix = writer.encode(barcodeText, format, 1300, 141, hints);

            // 方案1.1：直接裁剪白边
            return generateBarcodeWithCroppedMargin(matrix, barcodeText);
        }
        catch (IOException e) {
            throw new RuntimeException("Error generating barcode", e);
        } catch (WriterException e) {
            throw new RuntimeException(e);
        }
    }

    private byte[] generateBarcodeWithCroppedMargin(BitMatrix matrix, String barcodeText) throws IOException {
        int width = matrix.getWidth();
        int height = matrix.getHeight();

        // 找到条码的实际边界
        int left = findLeftBoundary(matrix);
        int right = findRightBoundary(matrix);
        int top = findTopBoundary(matrix);
        int bottom = findBottomBoundary(matrix);

        // 计算条码的实际宽度和高度
        int barcodeWidth = right - left + 1;
        int barcodeHeight = bottom - top + 1;

        // 计算文字区域高度
        int textAreaHeight = 30 + 27;

        // 创建最终图像（精确尺寸）
        BufferedImage finalImage = new BufferedImage(
                barcodeWidth,
                barcodeHeight + textAreaHeight,
                BufferedImage.TYPE_BYTE_BINARY
        );

        Graphics2D g2d = finalImage.createGraphics();

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

        // 绘制条码（只绘制有效部分）
        g2d.setColor(Color.BLACK);
        for (int x = left; x <= right; x++) {
            for (int y = top; y <= bottom; y++) {
                if (matrix.get(x, y)) {
                    g2d.fillRect(x - left, y - top, 1, 1);
                }
            }
        }

        // 添加自定义文字
        addTextToBarcode(g2d, barcodeText, barcodeWidth, barcodeHeight);

        g2d.dispose();

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

        return resultStream.toByteArray();
    }

    // 辅助方法：找到条码的边界
    private int findLeftBoundary(BitMatrix matrix) {
        int width = matrix.getWidth();
        int height = matrix.getHeight();

        for (int x = 0; x < width; x++) {
            for (int y = 0; y < height; y++) {
                if (matrix.get(x, y)) {
                    return x;
                }
            }
        }
        return 0;
    }

    private int findRightBoundary(BitMatrix matrix) {
        int width = matrix.getWidth();
        int height = matrix.getHeight();

        for (int x = width - 1; x >= 0; x--) {
            for (int y = 0; y < height; y++) {
                if (matrix.get(x, y)) {
                    return x;
                }
            }
        }
        return width - 1;
    }

    private int findTopBoundary(BitMatrix matrix) {
        int width = matrix.getWidth();
        int height = matrix.getHeight();

        for (int y = 0; y < height; y++) {
            for (int x = 0; x < width; x++) {
                if (matrix.get(x, y)) {
                    return y;
                }
            }
        }
        return 0;
    }

    private int findBottomBoundary(BitMatrix matrix) {
        int width = matrix.getWidth();
        int height = matrix.getHeight();

        for (int y = height - 1; y >= 0; y--) {
            for (int x = 0; x < width; x++) {
                if (matrix.get(x, y)) {
                    return y;
                }
            }
        }
        return height - 1;
    }




    public byte[] generateBarcodeImage1(String barcodeText) {
        try {
           // 使用 BitMatrix 生成纯条码，不包含任何文字
            BarcodeFormat format = BarcodeFormat.CODE_39; // 根据您的条码类型

            // 创建编码器
            Code39Writer writer = new Code39Writer();

            // 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, 1128, 199, 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, 18);
            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);
        }
    }




    public byte[] generateBarcodeImageScarn(String barcodeText) {
        try {
            // 使用 BitMatrix 生成纯条码，不包含任何文字
            BarcodeFormat format = BarcodeFormat.CODE_39; // 根据您的条码类型

            // 创建编码器
            Code39Writer writer = new Code39Writer();

            // 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, 230, 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, 18);
            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);
        }
    }
}