150 lines
4.4 KiB
Go
150 lines
4.4 KiB
Go
package pdf
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import (
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"bytes"
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"context"
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"fmt"
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"os"
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"path/filepath"
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"tyapi-server/internal/domains/product/entities"
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"github.com/jung-kurt/gofpdf/v2"
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"github.com/shopspring/decimal"
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"go.uber.org/zap"
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)
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// PDFGeneratorRefactored 重构后的PDF生成器
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type PDFGeneratorRefactored struct {
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logger *zap.Logger
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fontManager *FontManager
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textProcessor *TextProcessor
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markdownProc *MarkdownProcessor
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tableParser *TableParser
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tableRenderer *TableRenderer
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jsonProcessor *JSONProcessor
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logoPath string
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watermarkText string
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}
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// NewPDFGeneratorRefactored 创建重构后的PDF生成器
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func NewPDFGeneratorRefactored(logger *zap.Logger) *PDFGeneratorRefactored {
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// 初始化各个模块
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textProcessor := NewTextProcessor()
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fontManager := NewFontManager(logger)
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markdownProc := NewMarkdownProcessor(textProcessor)
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tableParser := NewTableParser(logger, fontManager)
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tableRenderer := NewTableRenderer(logger, fontManager, textProcessor)
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jsonProcessor := NewJSONProcessor()
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gen := &PDFGeneratorRefactored{
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logger: logger,
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fontManager: fontManager,
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textProcessor: textProcessor,
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markdownProc: markdownProc,
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tableParser: tableParser,
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tableRenderer: tableRenderer,
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jsonProcessor: jsonProcessor,
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watermarkText: "海南海宇大数据有限公司",
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}
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// 查找logo文件
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gen.findLogo()
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return gen
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}
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// findLogo 查找logo文件（仅从resources/pdf加载）
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func (g *PDFGeneratorRefactored) findLogo() {
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// 获取resources/pdf目录（使用统一的资源路径查找函数）
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resourcesPDFDir := GetResourcesPDFDir()
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logoPath := filepath.Join(resourcesPDFDir, "logo.png")
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// 检查文件是否存在
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if _, err := os.Stat(logoPath); err == nil {
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g.logoPath = logoPath
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return
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}
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// 只记录关键错误
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g.logger.Warn("未找到logo文件", zap.String("path", logoPath))
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}
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// GenerateProductPDF 为产品生成PDF文档（接受响应类型，内部转换）
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func (g *PDFGeneratorRefactored) GenerateProductPDF(ctx context.Context, productID string, productName, productCode, description, content string, price float64, doc *entities.ProductDocumentation) ([]byte, error) {
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// 构建临时的 Product entity（仅用于PDF生成）
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product := &entities.Product{
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ID: productID,
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Name: productName,
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Code: productCode,
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Description: description,
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Content: content,
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}
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// 如果有价格信息，设置价格
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if price > 0 {
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product.Price = decimal.NewFromFloat(price)
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}
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return g.generatePDF(product, doc)
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}
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// GenerateProductPDFFromEntity 从entity类型生成PDF（推荐使用）
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func (g *PDFGeneratorRefactored) GenerateProductPDFFromEntity(ctx context.Context, product *entities.Product, doc *entities.ProductDocumentation) ([]byte, error) {
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return g.generatePDF(product, doc)
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}
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// generatePDF 内部PDF生成方法
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func (g *PDFGeneratorRefactored) generatePDF(product *entities.Product, doc *entities.ProductDocumentation) (result []byte, err error) {
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defer func() {
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if r := recover(); r != nil {
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// 将panic转换为error，而不是重新抛出
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if e, ok := r.(error); ok {
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err = fmt.Errorf("PDF生成panic: %w", e)
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} else {
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err = fmt.Errorf("PDF生成panic: %v", r)
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}
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result = nil
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}
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}()
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// 创建PDF文档 (A4大小，gofpdf v2 默认支持UTF-8)
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pdf := gofpdf.New("P", "mm", "A4", "")
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// 优化边距，减少空白
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pdf.SetMargins(15, 25, 15)
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// 加载黑体字体（用于所有内容，除了水印）
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chineseFontAvailable := g.fontManager.LoadChineseFont(pdf)
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// 加载水印字体（使用宋体或其他非黑体字体）
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g.fontManager.LoadWatermarkFont(pdf)
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// 设置文档信息
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pdf.SetTitle("Product Documentation", true)
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pdf.SetAuthor("TYAPI Server", true)
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pdf.SetCreator("TYAPI Server", true)
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// 创建页面构建器
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pageBuilder := NewPageBuilder(g.logger, g.fontManager, g.textProcessor, g.markdownProc, g.tableParser, g.tableRenderer, g.jsonProcessor, g.logoPath, g.watermarkText)
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// 添加第一页（产品信息）
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pageBuilder.AddFirstPage(pdf, product, doc, chineseFontAvailable)
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// 如果有关联的文档，添加接口文档页面
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if doc != nil {
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pageBuilder.AddDocumentationPages(pdf, doc, chineseFontAvailable)
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}
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// 生成PDF字节流
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var buf bytes.Buffer
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err = pdf.Output(&buf)
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if err != nil {
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// 错误已返回，不记录日志
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return nil, fmt.Errorf("生成PDF失败: %w", err)
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}
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pdfBytes := buf.Bytes()
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return pdfBytes, nil
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}
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