package com.ruoyi.common.utils.poi;

import com.alibaba.fastjson.JSON;
import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.WriterException;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;
import com.ruoyi.common.utils.StringUtils;
import com.ruoyi.framework.config.RuoYiConfig;
import org.apache.commons.collections4.CollectionUtils;
import org.apache.poi.util.IOUtils;
import org.apache.poi.util.Units;
import org.apache.poi.xwpf.usermodel.XWPFDocument;
import org.apache.poi.xwpf.usermodel.XWPFParagraph;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import javax.imageio.ImageIO;
import javax.servlet.http.HttpServletResponse;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.*;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;

public class QRCodeUtil<T> {
    private static final Logger log = LoggerFactory.getLogger(QRCodeUtil.class);

    /**
     * 导出数据列表
     */
    private List<T> list;
    private String title;
    private static XWPFDocument doc;

    //CODE_WIDTH：二维码宽度，单位像素（适当提高分辨率，让文字更清晰）
    private static final int CODE_WIDTH = 400;
    //CODE_HEIGHT：二维码高度，单位像素
    private static final int CODE_HEIGHT = 400;
    //FONT_WIDTH：字体大小（稍微放大一点）
    private static final int FONT_WIDTH = 18;
    //FRONT_COLOR：二维码前景色，0x000000 表示黑色
    private static final int FRONT_COLOR = 0x000000;
    //BACKGROUND_COLOR：二维码背景色，0xFFFFFF 表示白色
    //演示用 16 进制表示，和前端页面 CSS 的取色是一样的，注意前后景颜色应该对比明显，如常见的黑白
    private static final int BACKGROUND_COLOR = 0xFFFFFF;

    /**
     * 实体对象
     */
    public Class<T> clazz;


    public QRCodeUtil(Class<T> clazz) {
        this.clazz = clazz;
    }

    private void init(List<T> list, String title) {
        if (CollectionUtils.isEmpty(list)) {
            list = new ArrayList<>();
        }
        this.list = list;
        this.title = title;
        doc = new XWPFDocument();
    }

    public void exportQRCode(HttpServletResponse response, List<T> list) {
        exportQRCode(response, list, StringUtils.EMPTY);
    }

    public void exportQRCode(HttpServletResponse response, List<T> list, String title) {
        response.setContentType("application/vnd.openxmlformats-officedocument.wordprocessingml.document");
        response.setCharacterEncoding("utf-8");
        this.init(list, title);
        exportQRCode(response);
    }

    public void exportQRCode(HttpServletResponse response) {
        try {
            writeDoc();
            doc.write(response.getOutputStream());
        } catch (Exception e) {
            log.error("导出Word异常{}", e.getMessage());
        } finally {
            IOUtils.closeQuietly(doc);
        }
    }

    public static void createCodeToFile(String content, File codeImgFileSaveDir, String fileName) {
        try {
            if (StringUtils.isBlank(content) || StringUtils.isBlank(fileName)) {
                return;
            }
            content = content.trim();
            if (codeImgFileSaveDir == null || codeImgFileSaveDir.isFile()) {
                //二维码图片存在目录为空，默认放在桌面...
                codeImgFileSaveDir = new File(RuoYiConfig.getQRCodePath());
            }
            if (!codeImgFileSaveDir.exists()) {
                //二维码图片存在目录不存在，开始创建...
                codeImgFileSaveDir.mkdirs();
            }

            //核心代码-生成二维码
            BufferedImage bufferedImage = getBufferedImage(content);

            File codeImgFile = new File(codeImgFileSaveDir, fileName);
            ImageIO.write(bufferedImage, "png", codeImgFile);

            log.info("二维码图片生成成功：" + codeImgFile.getPath());
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    public static void createCodeToStream(String content, ByteArrayOutputStream baos, String topText, String bottomText) {
        try {
            if (StringUtils.isBlank(content)) {
                return;
            }
            content = content.trim();
            //核心代码-生成二维码
            BufferedImage qrCodeImage = getBufferedImage(content);

            // 计算总高度：顶部文字区域 + 二维码 + 底部文字区域
            int topMargin = StringUtils.isNotEmpty(topText) ? 40 : 0; // 顶部文字区域高度
            int bottomMargin = 80; // 底部文字区域高度，适当加大以容纳多行文字
            int totalHeight = CODE_HEIGHT + topMargin + bottomMargin;

            // 创建包含顶部和底部文字的组合图片
            BufferedImage combinedImage = new BufferedImage(CODE_WIDTH, totalHeight, BufferedImage.TYPE_INT_RGB);
            Graphics2D g = combinedImage.createGraphics();

            // 设置抗锯齿（图像和文字）
            g.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
            g.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_ON);

            // 设置背景颜色为白色
            g.setColor(Color.WHITE);
            g.fillRect(0, 0, CODE_WIDTH, totalHeight);

            // 绘制顶部文字
            if (StringUtils.isNotEmpty(topText)) {
                g.setColor(Color.BLACK);
                g.setFont(new Font("微软雅黑", Font.PLAIN, FONT_WIDTH));
                FontMetrics fm = g.getFontMetrics();
                int textWidth = fm.stringWidth(topText);
                int textX = (CODE_WIDTH - textWidth) / 2;
                int textY = topMargin - 10; // 文字在顶部区域垂直居中
                g.drawString(topText, textX, textY);
            }

            // 绘制二维码（向下偏移顶部文字区域的高度）
            g.drawImage(qrCodeImage, 0, topMargin, null);

            // 绘制底部文字（支持自动换行）
            if (StringUtils.isNotEmpty(bottomText)) {
                g.setColor(Color.BLACK);
                g.setFont(new Font("微软雅黑", Font.PLAIN, FONT_WIDTH));
                FontMetrics fm = g.getFontMetrics();

                int maxWidth = CODE_WIDTH - 20; // 留左右 10 像素边距
                List<String> lines = new ArrayList<>();
                StringBuilder currentLine = new StringBuilder();

                for (int i = 0; i < bottomText.length(); i++) {
                    char c = bottomText.charAt(i);
                    currentLine.append(c);
                    if (fm.stringWidth(currentLine.toString()) > maxWidth) {
                        // 超出宽度，回退一个字符作为下一行开始
                        currentLine.deleteCharAt(currentLine.length() - 1);
                        lines.add(currentLine.toString());
                        currentLine = new StringBuilder().append(c);
                    }
                }
                if (currentLine.length() > 0) {
                    lines.add(currentLine.toString());
                }

                int lineHeight = fm.getHeight();
                int startY = topMargin + CODE_HEIGHT + (bottomMargin - lineHeight * lines.size()) / 2 + fm.getAscent();

                for (int i = 0; i < lines.size(); i++) {
                    String line = lines.get(i);
                    int textWidth = fm.stringWidth(line);
                    int textX = (CODE_WIDTH - textWidth) / 2;
                    int textY = startY + i * lineHeight;
                    g.drawString(line, textX, textY);
                }
            }

            g.dispose();
            ImageIO.write(combinedImage, "png", baos);

            log.info("二维码图片生成到输出流成功...");
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    private static Font loadFont(String fontFilePath, int fontSize) throws IOException, FontFormatException {
        return Font.createFont(Font.TRUETYPE_FONT, new File(fontFilePath)).deriveFont(Font.PLAIN, fontSize);
    }

    //核心代码-生成二维码
    private static BufferedImage getBufferedImage(String content) throws WriterException {

        //com.google.zxing.EncodeHintType：编码提示类型,枚举类型
        Map<EncodeHintType, Object> hints = new HashMap<>();

        //EncodeHintType.CHARACTER_SET：设置字符编码类型
        hints.put(EncodeHintType.CHARACTER_SET, "UTF-8");

        //EncodeHintType.ERROR_CORRECTION：设置误差校正
        //ErrorCorrectionLevel：误差校正等级，L = ~7% correction、M = ~15% correction、Q = ~25% correction、H = ~30% correction
        //不设置时，默认为 L 等级，等级不一样，生成的图案不同，但扫描的结果是一样的
        hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.L);

        //EncodeHintType.MARGIN：设置二维码边距，单位像素，值越小，二维码距离四周越近
        hints.put(EncodeHintType.MARGIN, 1);

        MultiFormatWriter multiFormatWriter = new MultiFormatWriter();
        BitMatrix bitMatrix = multiFormatWriter.encode(content, BarcodeFormat.QR_CODE, CODE_WIDTH, CODE_HEIGHT, hints);
        BufferedImage bufferedImage = new BufferedImage(CODE_WIDTH, CODE_HEIGHT, BufferedImage.TYPE_INT_BGR);
        for (int x = 0; x < CODE_WIDTH; x++) {
            for (int y = 0; y < CODE_HEIGHT; y++) {
                bufferedImage.setRGB(x, y, bitMatrix.get(x, y) ? FRONT_COLOR : BACKGROUND_COLOR);
            }
        }
        return bufferedImage;
    }


    private void writeDoc() {
        XWPFParagraph paragraph = doc.createParagraph();
        list.forEach(item -> {
            try {
                log.info("==================================================" + JSON.toJSONString(item));
                //务必重写类的toString方法
                ByteArrayOutputStream baos = new ByteArrayOutputStream();
                createCodeToStream(JSON.toJSONString(item), baos, title, item.toString());
                InputStream is = new ByteArrayInputStream(baos.toByteArray());
                paragraph.createRun().addPicture(is, XWPFDocument.PICTURE_TYPE_JPEG, "image.jpg", Units.toEMU(200), Units.toEMU(200));
            } catch (Exception e) {
                e.printStackTrace();
            }
        });
    }


    /**
     * 生成二维码图片并打包成ZIP文件下载
     *
     * @param response HttpServletResponse
     * @param list     数据列表
     * @param title    标题（可选）
     */
    public void exportQRCodeAsZip(HttpServletResponse response, List<T> list, String title) {

        response.setContentType("application/zip");
        response.setCharacterEncoding("utf-8");
        response.setHeader("Content-Disposition", "attachment;");

        this.init(list, title);

        try (ZipOutputStream zos = new ZipOutputStream(response.getOutputStream())) {
            // 设置压缩级别
            zos.setLevel(ZipOutputStream.STORED);

            int index = 1;
            for (T item : list) {
                try {
                    // 生成文件名
                    String fileName = generateFileName(item, index) + ".png";
                    index++;

                    // 创建ZIP条目
                    ZipEntry zipEntry = new ZipEntry(fileName);
                    zos.putNextEntry(zipEntry);

                    // 生成二维码图片并写入ZIP
                    ByteArrayOutputStream baos = new ByteArrayOutputStream();
                    String content = JSON.toJSONString(item);
                    String bottomText = item.toString();

                    createCodeToStream(content, baos, title, bottomText);

                    // 将字节数组写入ZIP
                    zos.write(baos.toByteArray());
                    zos.closeEntry();

                    baos.close();

                    log.info("成功生成二维码图片: {}", fileName);
                } catch (Exception e) {
                    log.error("生成二维码图片失败: {}", e.getMessage());
                }
            }

            zos.finish();
            log.info("ZIP文件生成成功，包含 {} 个二维码图片", list.size());

        } catch (Exception e) {
            log.error("生成ZIP文件异常: {}", e.getMessage());
            try {
                response.reset();
                response.setContentType("application/json");
                response.setCharacterEncoding("utf-8");
                response.getWriter().println("生成ZIP文件失败: " + e.getMessage());
            } catch (IOException ex) {
                log.error("发送错误信息失败: {}", ex.getMessage());
            }
        }
    }

    /**
     * 生成二维码图片并打包成ZIP文件下载（简化版）
     *
     * @param response HttpServletResponse
     * @param list     数据列表
     */
    public void exportQRCodeAsZip(HttpServletResponse response, List<T> list) {
        exportQRCodeAsZip(response, list, StringUtils.EMPTY);
    }


    /**
     * 生成文件名
     *
     * @param item  数据项
     * @param index 索引
     * @return 文件名
     */
    private String generateFileName(T item, int index) {
        // 如果对象有特定的标识字段，可以重写此方法
        // 例如：如果对象有name字段，可以返回 item.getName()

        // 默认使用索引+对象字符串表示
        String baseName = StringUtils.substring(item.toString(), 0, 20); // 限制长度
        baseName = baseName.replaceAll("[^a-zA-Z0-9\\u4e00-\\u9fa5]", "_"); // 替换特殊字符
        return String.format("%03d_%s", index, baseName);
    }

}