import requests
from django.conf import settings
import dropbox
from dropbox.exceptions import ApiError

from app_be.services.StorageServiceInterface import StorageServiceInterface


class DropboxService(StorageServiceInterface):
    name = "Dropbox"

    @staticmethod
    def get_last_modified(filename: str):
        """Get last modified time of file

        :param filename: filename
        :return: Date of last modification or None
        """
        try:
            dbx = dropbox.Dropbox(settings.DROPBOX_OAUTH2_ACCESS_TOKEN)
            return dbx.files_get_metadata(settings.DROPBOX_IMAGE_FOLDER + filename).server_modified
        except:
            return None
        return None

    @staticmethod
    def check() -> bool:
        try:
            dbx = dropbox.Dropbox(settings.DROPBOX_OAUTH2_ACCESS_TOKEN)
            result = dbx.check_user(query=u'Hello')
            if not result.result == 'Hello':
                print("String does not match")
                return False
        except:
            return False
        return True

    @staticmethod
    def create_file(filename: str, file: bytes) -> bool:
        """Create / save (or overwrite) an file on the dropbox storage.

        :param filename: filename
        :param file: bytes representation of the file
        :return: Whether file was successfully uploaded
        """
        try:
            dbx = dropbox.Dropbox(settings.DROPBOX_OAUTH2_ACCESS_TOKEN)
            dbx.files_upload(file, settings.DROPBOX_IMAGE_FOLDER + filename)
        except Exception as ex:
            print(ex)
            return False
        return True

    @staticmethod
    def read_file(filename: str) -> bytes:
        """Read  file on the dropbox storage.

        :param filename: filename
        :return: bytes representation of the file or None on error
        """
        file_bytes: bytes = None
        try:
            dbx = dropbox.Dropbox(settings.DROPBOX_OAUTH2_ACCESS_TOKEN)
            f: requests.models.Response
            metadata, f = dbx.files_download(settings.DROPBOX_IMAGE_FOLDER + filename)
            file_bytes = f.content
            if f is not None:
                f.close()
        except:
            print("Error downloading file from dropbox")
        return file_bytes

    @staticmethod
    def move_file(identifier_from: str, identifier_to: str) -> bool:
        """Move/Rename a file on the dropbox storage.

        :param identifier_from: Location of the file to be moved
        :param identifier_to: Location the file should be moved to
        :return True on success, False otherwise
        """
        print("DropboxService: Trying to move/rename file with identifier {} to identifier {}".format(identifier_from,
                                                                                                      identifier_to))

        dbx = dropbox.Dropbox(settings.DROPBOX_OAUTH2_ACCESS_TOKEN)
        url_from = settings.DROPBOX_IMAGE_FOLDER + identifier_from + '.jpg'
        url_to = settings.DROPBOX_IMAGE_FOLDER + identifier_to

        try:
            dbx.files_move_v2(url_from, url_to)
        except ApiError:
            return False

        return True

    @staticmethod
    def delete_file(filename: str) -> bool:
        """Delete an file from the dropbox storage.

        :param filename: filename of the file
        :return: Whether file was successfully deleted
        """
        try:
            dbx = dropbox.Dropbox(settings.DROPBOX_OAUTH2_ACCESS_TOKEN)
            dbx.files_delete_v2(settings.DROPBOX_IMAGE_FOLDER + filename)
        except:
            return False
        return True

    @staticmethod
    def delete_all() -> bool:
        """Delete every file from the dropbox storage.

        :return: Whether the storage was successfully emptied
        """
        try:
            dbx = dropbox.Dropbox(settings.DROPBOX_OAUTH2_ACCESS_TOKEN)
            dbx.files_delete_v2(settings.DROPBOX_IMAGE_FOLDER[:-1])
            dbx.files_create_folder_v2(settings.DROPBOX_IMAGE_FOLDER[:-1])
        except dropbox.exceptions.ApiError as e:
            print(e)
            return False
        return True