// ingestion/internal/extract/pdf.go
package extract

import (
	"bytes"
	"fmt"
	"os/exec"
	"strings"
)

// extractPDF runs pdftotext on path and returns the extracted text.
// pdftotext must be installed (package: poppler-utils on Alpine/Debian, poppler on Homebrew).
func extractPDF(path string) (string, error) {
	cmd := exec.Command("pdftotext", "-q", path, "-")
	var stdout, stderr bytes.Buffer
	cmd.Stdout = &stdout
	cmd.Stderr = &stderr

	if err := cmd.Run(); err != nil {
		errMsg := strings.TrimSpace(stderr.String())
		if errMsg == "" {
			errMsg = err.Error()
		}
		return "", fmt.Errorf("pdftotext: %s", errMsg)
	}

	return strings.TrimSpace(stdout.String()), nil
}