import os
from pathlib import Path
from datetime import timedelta
from google.cloud import storage
from huggingface_hub import hf_hub_download
from google.cloud.storage import transfer_manager


def download_credentials() -> None:
    """
    Downloads the GCP credentials from Hugging Face Hub
    :return: None
    """
    os.makedirs('assets', exist_ok=True)
    hf_hub_download(
        repo_id=os.environ.get('DATA'), repo_type='dataset', filename="credentials.json",
        token=os.environ.get('HUB_TOKEN'), local_dir="assets"
    )
    return


def upload_folder(client_name: str, source_directory: str) -> None:
    """
    Uploads the given source directory to the GCP bucket.
    :param client_name: name of the client, used as name of the main folder
    :param source_directory: directory with all the sub-folders and files to upload
    :return: None
    """
    # Filter so the list only includes files, not directories themselves.
    string_paths = [
        str(path.relative_to(source_directory)).replace("\\", "/") for path in Path(source_directory).rglob("*")
        if path.is_file()
    ]

    # Path where the files in the source directory will be saved
    delimiter = source_directory.find(client_name)
    destination_directory = source_directory[delimiter:] + "/"

    # Start the upload. Threads was used instead of process because Gradio was rebooted with the second one.
    bucket = STORAGE_CLIENT.bucket('clients-bella')
    _ = transfer_manager.upload_many_from_filenames(
        bucket, filenames=string_paths, source_directory=source_directory, max_workers=1,
        blob_name_prefix=destination_directory, worker_type=transfer_manager.THREAD
    )
    return


def get_link_file(client_name: str, type_media: str, media_name: str) -> str:
    """
    Gets a public link during 15 minutes to a given file in GCP
    :param client_name: name of the client (name of the main folder)
    :param type_media: if it is audio or video
    :param media_name: name of the desired media file
    :return: public link to the file
    """

    if media_name == 'waiting.wav':
        bucket = STORAGE_CLIENT.bucket('audios_bella')
        blob = bucket.blob('waiting.wav')
    else:
        bucket = STORAGE_CLIENT.bucket('clients-bella')
        blobs = bucket.list_blobs(prefix=f'{client_name}/media/{type_media}/{media_name}')
        blob = next(blobs)
    signed_url = blob.generate_signed_url(expiration=timedelta(minutes=15))
    return signed_url


download_credentials()
STORAGE_CLIENT = storage.Client.from_service_account_json(os.getenv('GOOGLE_APPLICATION_CREDENTIALS'))