@RestController
@RequestMapping("/api/reports")
public class ReportController {
    
    @Autowired
    private BookReportService bookReportService;
    
    @GetMapping("/books")
    public ResponseEntity<String> generateBookReport() {
        try {
            String fileName = "圖書統(tǒng)計(jì)報告_" + System.currentTimeMillis() + ".docx";
            String outputPath = "reports/" + fileName;
            
            bookReportService.generateReport(outputPath);
            
            return ResponseEntity.ok("報告生成成功: " + outputPath);
        } catch (Exception e) {
            return ResponseEntity.status(500)
                    .body("報告生成失敗: " + e.getMessage());
        }
    }
}

public interface BookReportMapper {
    // 獲取圖書總量
    int selectTotalBookCount();
    
    // 按分類統(tǒng)計(jì)圖書數(shù)量
    List<Map<String, Object>> selectBooksByCategory();
    
    // 獲取熱門圖書TOP10
    List<Map<String, Object>> selectPopularBooks();
    
    // 獲取借閱統(tǒng)計(jì)
    List<Map<String, Object>> selectBorrowStats();
}

@Service
public class BookReportService {
    
    @Autowired
    private BookReportMapper bookReportMapper;

    public void generateReport(String outputPath) throws Exception {
        // 創(chuàng)建Word文檔
        XWPFDocument document = new XWPFDocument();
        
        try {
            // 添加報告標(biāo)題
            addTitle(document, "圖書館圖書統(tǒng)計(jì)報告");
            
            // 添加生成日期
            addGenerationDate(document);
            
            // 添加圖書總量統(tǒng)計(jì)
            addTotalBookCount(document);
            
            // 添加分類統(tǒng)計(jì)表格
            addCategoryStatistics(document);
            
            // 添加熱門圖書列表
            addPopularBooks(document);
            
            // 添加借閱統(tǒng)計(jì)
            addBorrowStatistics(document);
            
            // 保存文檔
            saveDocument(document, outputPath);
        } finally {
            document.close();
        }
    }
    
    // 創(chuàng)建報告主標(biāo)題，設(shè)置居中、加粗和大號字體
    private void addTitle(XWPFDocument document, String titleText) {
        XWPFParagraph title = document.createParagraph();
        title.setAlignment(ParagraphAlignment.CENTER);
        
        XWPFRun titleRun = title.createRun();
        titleRun.setText(titleText);
        titleRun.setBold(true);
        titleRun.setFontSize(20);
        titleRun.setFontFamily("宋體");
        
        // 添加空行
        document.createParagraph();
    }
    
    // 在右上角添加報告生成日期
    private void addGenerationDate(XWPFDocument document) {
        XWPFParagraph datePara = document.createParagraph();
        datePara.setAlignment(ParagraphAlignment.RIGHT);
        
        XWPFRun dateRun = datePara.createRun();
        dateRun.setText("生成日期: " + LocalDate.now().toString());
        dateRun.setFontSize(12);
        dateRun.setFontFamily("宋體");
        
        // 添加空行
        document.createParagraph();
    }
    
    // 顯示圖書館藏書總量
    private void addTotalBookCount(XWPFDocument document) {
        int totalCount = bookReportMapper.selectTotalBookCount();
        
        XWPFParagraph sectionTitle = createSectionTitle(document, "一、圖書總量統(tǒng)計(jì)");
        
        XWPFParagraph content = document.createParagraph();
        XWPFRun run = content.createRun();
        run.setText(String.format("圖書館目前共有藏書: %s冊", formatNumber(totalCount)));
        run.setFontSize(14);
        run.setFontFamily("宋體");
        
        // 添加空行
        document.createParagraph();
    }
    
    // 創(chuàng)建分類統(tǒng)計(jì)表格，包括序號、分類名稱、數(shù)量和占比
    private void addCategoryStatistics(XWPFDocument document) throws Exception {
        // 創(chuàng)建章節(jié)標(biāo)題
        XWPFParagraph sectionTitle = createSectionTitle(document, "二、圖書分類統(tǒng)計(jì)");
        
        // 獲取分類數(shù)據(jù)
        List<Map<String, Object>> categories = bookReportMapper.selectBooksByCategory();
        int total = bookReportMapper.selectTotalBookCount();
        
        // 創(chuàng)建表格
        XWPFTable table = document.createTable(1, 4);
        table.setWidth("100%");
        
        // 設(shè)置表頭
        setTableHeader(table, "序號", "圖書分類", "數(shù)量", "占比");
        
        // 填充數(shù)據(jù)
        int index = 1;
        for (Map<String, Object> category : categories) {
            XWPFTableRow row = table.createRow();
            row.getCell(0).setText(String.valueOf(index++));
            row.getCell(1).setText(category.get("categoryName").toString());
            
            int count = Integer.parseInt(category.get("count").toString());
            row.getCell(2).setText(formatNumber(count));
            
            double percent = (count * 100.0) / total;
            row.getCell(3).setText(String.format("%.1f%%", percent));
        }
        
        // 添加匯總行
        XWPFTableRow footer = table.createRow();
        footer.getCell(1).setText("總計(jì)");
        footer.getCell(2).setText(formatNumber(total));
        footer.getCell(3).setText("100%");
        
        // 添加空行
        document.createParagraph();
    }
    
    // 列出熱門圖書TOP10，前三名用藍(lán)色加粗顯示
    private void addPopularBooks(XWPFDocument document) {
        // 創(chuàng)建章節(jié)標(biāo)題
        XWPFParagraph sectionTitle = createSectionTitle(document, "三、熱門圖書TOP10");
        
        List<Map<String, Object>> popularBooks = bookReportMapper.selectPopularBooks();
        
        for (int i = 0; i < popularBooks.size(); i++) {
            Map<String, Object> book = popularBooks.get(i);
            
            XWPFParagraph item = document.createParagraph();
            item.setIndentationLeft(200);
            
            XWPFRun run = item.createRun();
            run.setText(String.format("%d. 《%s》 - %s (借閱量: %s次)", 
                i + 1,
                book.get("title"),
                book.get("author"),
                formatNumber(Long.parseLong(book.get("borrowCount").toString()))
            );
            run.setFontSize(12);
            run.setFontFamily("宋體");
            
            // 突出顯示前三名
            if (i < 3) {
                run.setBold(true);
                run.setColor("0000FF");
            }
        }
        
        // 添加空行
        document.createParagraph();
    }
    
    // 創(chuàng)建借閱統(tǒng)計(jì)表格，顯示每月借閱量和同比增長率
    private void addBorrowStatistics(XWPFDocument document) {
        // 創(chuàng)建章節(jié)標(biāo)題
        XWPFParagraph sectionTitle = createSectionTitle(document, "四、借閱統(tǒng)計(jì)");
        
        List<Map<String, Object>> borrowStats = bookReportMapper.selectBorrowStats();
        
        // 創(chuàng)建表格
        XWPFTable table = document.createTable(1, 3);
        table.setWidth("100%");
        
        // 設(shè)置表頭
        setTableHeader(table, "月份", "借閱量", "同比增長");
        
        // 填充數(shù)據(jù)
        for (Map<String, Object> stat : borrowStats) {
            XWPFTableRow row = table.createRow();
            row.getCell(0).setText(stat.get("month").toString());
            row.getCell(1).setText(formatNumber(Long.parseLong(stat.get("count").toString())));
            
            // 計(jì)算同比增長
            if (stat.containsKey("growthRate")) {
                double growth = Double.parseDouble(stat.get("growthRate").toString());
                row.getCell(2).setText(String.format("%.1f%%", growth * 100));
                
                // 設(shè)置顏色：增長為紅色，下降為綠色
                XWPFRun growthRun = row.getCell(2).getParagraphs().get(0).getRuns().get(0);
                if (growth > 0) {
                    growthRun.setColor("FF0000");
                } else if (growth < 0) {
                    growthRun.setColor("00FF00");
                }
            } else {
                row.getCell(2).setText("N/A");
            }
        }
    }
    
    // 輔助方法，創(chuàng)建統(tǒng)一的章節(jié)標(biāo)題格式
    private XWPFParagraph createSectionTitle(XWPFDocument document, String title) {
        XWPFParagraph paragraph = document.createParagraph();
        XWPFRun run = paragraph.createRun();
        run.setText(title);
        run.setBold(true);
        run.setFontSize(16);
        run.setFontFamily("宋體");
        
        return paragraph;
    }
    
    // 輔助方法，設(shè)置表格表頭樣式
    private void setTableHeader(XWPFTable table, String... headers) {
        XWPFTableRow headerRow = table.getRow(0);
        for (int i = 0; i < headers.length; i++) {
            XWPFRun run = headerRow.getCell(i).getParagraphs().get(0).createRun();
            run.setText(headers[i]);
            run.setBold(true);
            run.setFontSize(12);
            run.setFontFamily("宋體");
            
            // 設(shè)置單元格背景色
            headerRow.getCell(i).setColor("D3D3D3");
        }
    }
    
    // 格式化數(shù)字顯示，添加千位分隔符
    private String formatNumber(long number) {
        return String.format("%,d", number);
    }
    
    // 保存Word文檔到指定路徑
    private void saveDocument(XWPFDocument document, String outputPath) throws IOException {
        // 確保目錄存在
        File outputFile = new File(outputPath);
        outputFile.getParentFile().mkdirs();
        
        try (FileOutputStream out = new FileOutputStream(outputFile)) {
            document.write(out);
        }
    }
}