package parser

import (
	"fmt"
	"strings"
)

// CADParser is a stub parser for CAD/DWG files.
// Real implementation requires CGO/GDAL — reserved for future development.
type CADParser struct{}

func (p *CADParser) SupportedExtensions() []string {
	return []string{".dwg", ".dxf"}
}

func (p *CADParser) ParseToMarkdown(path string) (string, error) {
	// Stub: simulate extracting layer names and annotations
	var sb strings.Builder
	sb.WriteString("## CAD 图纸解析结果 (模拟)\n\n")
	sb.WriteString(fmt.Sprintf("**文件**: %s\n\n", path))
	sb.WriteString("### 图层列表\n\n")
	sb.WriteString("| 图层名 | 类型 | 元素数 |\n")
	sb.WriteString("| --- | --- | --- |\n")
	sb.WriteString("| STR_MAIN | 结构主体 | 142 |\n")
	sb.WriteString("| DIM_TEXT | 标注文字 | 87 |\n")
	sb.WriteString("| SEAL_V3 | 密封层 | 23 |\n\n")
	sb.WriteString("### 标注摘要\n\n")
	sb.WriteString("- 预留缝宽度: 2.5mm\n")
	sb.WriteString("- 坐标基点: X=1240, Y=442\n")
	sb.WriteString("\n> ⚠️ 本解析为模拟结果，完整 CAD 解析需集成 GDAL/LibreDWG。\n")

	return sb.String(), nil
}