package storageService

import (
	"mime/multipart"
	"os"
	"path/filepath"
	"strings"

	"git.ma-al.com/goc_daniel/b2b/app/model"
	"git.ma-al.com/goc_daniel/b2b/app/repos/storageRepo"
	"git.ma-al.com/goc_daniel/b2b/app/utils/responseErrors"
	"github.com/gofiber/fiber/v3"
)

type StorageService struct {
	storageRepo storageRepo.UIStorageRepo
}

func New() *StorageService {
	return &StorageService{
		storageRepo: storageRepo.New(),
	}
}

func (s *StorageService) ListContent(abs_path string) (*[]model.EntryInList, error) {
	info, err := s.storageRepo.EntryInfo(abs_path)
	if err != nil || !info.IsDir() {
		return nil, responseErrors.ErrFolderDoesNotExist
	}

	entries_in_list, err := s.storageRepo.ListContent(abs_path)
	return entries_in_list, err
}

func (s *StorageService) DownloadFilePrep(abs_path string) (*os.File, string, int64, error) {
	info, err := s.storageRepo.EntryInfo(abs_path)
	if err != nil || info.IsDir() {
		return nil, "", 0, responseErrors.ErrFileDoesNotExist
	}

	f, err := s.storageRepo.OpenFile(abs_path)
	if err != nil {
		return nil, "", 0, err
	}

	return f, filepath.Base(abs_path), info.Size(), nil
}

func (s *StorageService) UploadFile(c fiber.Ctx, abs_path string, f *multipart.FileHeader) error {
	info, err := s.storageRepo.EntryInfo(abs_path)
	if err != nil || !info.IsDir() {
		return responseErrors.ErrFolderDoesNotExist
	}

	name := f.Filename
	if name == "" || name == "." || name == ".." || filepath.Base(name) != name {
		return responseErrors.ErrBadAttribute
	}
	abs_file_path, err := s.AbsPath(abs_path, name)
	if err != nil {
		return err
	}
	if abs_file_path == abs_path {
		return responseErrors.ErrBadAttribute
	}

	info, err = s.storageRepo.EntryInfo(abs_file_path)
	if err == nil {
		return responseErrors.ErrNameTaken
	} else if os.IsNotExist(err) {
		return s.storageRepo.UploadFile(c, abs_file_path, f)
	} else {
		return err
	}
}

func (s *StorageService) CreateFolder(abs_path string, name string) error {
	info, err := s.storageRepo.EntryInfo(abs_path)
	if err != nil || !info.IsDir() {
		return responseErrors.ErrFolderDoesNotExist
	}

	if name == "" || name == "." || name == ".." || filepath.Base(name) != name {
		return responseErrors.ErrBadAttribute
	}
	abs_folder_path, err := s.AbsPath(abs_path, name)
	if err != nil {
		return err
	}
	if abs_folder_path == abs_path {
		return responseErrors.ErrBadAttribute
	}

	info, err = s.storageRepo.EntryInfo(abs_folder_path)
	if err == nil {
		return responseErrors.ErrNameTaken
	} else if os.IsNotExist(err) {
		return s.storageRepo.CreateFolder(abs_folder_path)
	} else {
		return err
	}
}

func (s *StorageService) DeleteFile(abs_path string) error {
	info, err := s.storageRepo.EntryInfo(abs_path)
	if err != nil || info.IsDir() {
		return responseErrors.ErrFileDoesNotExist
	}

	return s.storageRepo.DeleteFile(abs_path)
}

func (s *StorageService) DeleteFolder(abs_path string) error {
	info, err := s.storageRepo.EntryInfo(abs_path)
	if err != nil || !info.IsDir() {
		return responseErrors.ErrFolderDoesNotExist
	}

	return s.storageRepo.DeleteFolder(abs_path)
}

// AbsPath extracts an absolute path and validates it
func (s *StorageService) AbsPath(root string, relativePath string) (string, error) {
	clean_name := filepath.Clean(relativePath)
	full_path := filepath.Join(root, clean_name)

	if full_path != root && !strings.HasPrefix(full_path, root+string(os.PathSeparator)) {
		return "", responseErrors.ErrAccessDenied
	}

	return full_path, nil
}