package services

import (
	"os"
	"path/filepath"
	"time"

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

type FileConverter struct {
}

func NewFileConverter() *FileConverter {
	return &FileConverter{}
}

func (c *FileConverter) MergeFiles(filenames []string) (string, error) {
	timestamp := time.Now().Format("20060102-150405")
	mergedFilename := "merged-" + timestamp + ".pdf"
	mergedFile := "/home/backend/var/documents/" + mergedFilename

	outputDir := filepath.Dir(mergedFile)
	if err := os.MkdirAll(outputDir, 0755); err != nil {
		return "", err
	}

	_ = os.Remove(mergedFile)

	config := api.LoadConfiguration()

	if err := api.MergeCreateFile(filenames, mergedFile, false, config); err != nil {
		return "", err
	}

	return mergedFilename, nil
}