package common

import (
	"io"
	"os"
	"strings"

	"github.com/pdfcpu/pdfcpu/pkg/api"
)

type pdfParser struct{}

// Parse PDF：抽取全部文本，按页分隔（分页符供分块器识别）
func (p *pdfParser) Parse(path string) (string, error) {
	f, err := os.Open(path)
	if err != nil {
		return "", err
	}
	defer f.Close()

	var sb strings.Builder
	err = api.ExtractContent(f, nil, func(r io.Reader, _ int) error {
		b, err := io.ReadAll(r)
		if err != nil {
			return err
		}
		sb.Write(b)
		sb.WriteString("\n\n")
		return nil
	}, nil)
	if err != nil {
		return "", err
	}
	return sb.String(), nil
}