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#
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import json
import os
import random
import string
from contextlib import contextmanager

import pytest

from airflow.exceptions import AirflowException
from airflow.models import Connection
from airflow.providers.microsoft.azure.hooks.fileshare import AzureFileShareHook
from airflow.utils.process_utils import patch_environ
from tests.test_utils import AIRFLOW_MAIN_FOLDER
from tests.test_utils.system_tests_class import SystemTest

AZURE_DAG_FOLDER = os.path.join(
    AIRFLOW_MAIN_FOLDER, "airflow", "providers", "microsoft", "azure", "example_dags"
)
WASB_CONNECTION_ID = os.environ.get("WASB_CONNECTION_ID", "wasb_default")

DATA_LAKE_CONNECTION_ID = os.environ.get("AZURE_DATA_LAKE_CONNECTION_ID", 'azure_data_lake_default')
DATA_LAKE_CONNECTION_TYPE = os.environ.get("AZURE_DATA_LAKE_CONNECTION_TYPE", 'azure_data_lake')


@contextmanager
def provide_wasb_default_connection(key_file_path: str):
    """
    Context manager to provide a temporary value for wasb_default connection

    :param key_file_path: Path to file with wasb_default credentials .json file.
    """
    if not key_file_path.endswith(".json"):
        raise AirflowException("Use a JSON key file.")
    with open(key_file_path) as credentials:
        creds = json.load(credentials)
    conn = Connection(
        conn_id=WASB_CONNECTION_ID,
        conn_type="wasb",
        host=creds.get("host", None),
        login=creds.get("login", None),
        password=creds.get("password", None),
        extra=json.dumps(creds.get('extra', None)),
    )
    with patch_environ({f"AIRFLOW_CONN_{conn.conn_id.upper()}": conn.get_uri()}):
        yield


@contextmanager
def provide_azure_data_lake_default_connection(key_file_path: str):
    """
    Context manager to provide a temporary value for azure_data_lake_default connection
    :param key_file_path: Path to file with azure_data_lake_default credentials .json file.
    """
    required_fields = {'login', 'password', 'extra'}

    if not key_file_path.endswith(".json"):
        raise AirflowException("Use a JSON key file.")
    with open(key_file_path) as credentials:
        creds = json.load(credentials)
    missing_keys = required_fields - creds.keys()
    if missing_keys:
        message = f"{missing_keys} fields are missing"
        raise AirflowException(message)
    conn = Connection(
        conn_id=DATA_LAKE_CONNECTION_ID,
        conn_type=DATA_LAKE_CONNECTION_TYPE,
        host=creds.get("host", None),
        login=creds.get("login", None),
        password=creds.get("password", None),
        extra=json.dumps(creds.get('extra', None)),
    )
    with patch_environ({f"AIRFLOW_CONN_{conn.conn_id.upper()}": conn.get_uri()}):
        yield


@contextmanager
def provide_azure_fileshare(share_name: str, azure_fileshare_conn_id: str, file_name: str, directory: str):
    AzureSystemTest.prepare_share(
        share_name=share_name,
        azure_fileshare_conn_id=azure_fileshare_conn_id,
        file_name=file_name,
        directory=directory,
    )
    yield
    AzureSystemTest.delete_share(share_name=share_name, azure_fileshare_conn_id=azure_fileshare_conn_id)


@pytest.mark.system("azure")
class AzureSystemTest(SystemTest):
    @classmethod
    def create_share(cls, share_name: str, azure_fileshare_conn_id: str):
        hook = AzureFileShareHook(azure_fileshare_conn_id=azure_fileshare_conn_id)
        hook.create_share(share_name)

    @classmethod
    def delete_share(cls, share_name: str, azure_fileshare_conn_id: str):
        hook = AzureFileShareHook(azure_fileshare_conn_id=azure_fileshare_conn_id)
        hook.delete_share(share_name)

    @classmethod
    def create_directory(cls, share_name: str, azure_fileshare_conn_id: str, directory: str):
        hook = AzureFileShareHook(azure_fileshare_conn_id=azure_fileshare_conn_id)
        hook.create_directory(share_name=share_name, directory_name=directory)

    @classmethod
    def upload_file_from_string(
        cls,
        string_data: str,
        share_name: str,
        azure_fileshare_conn_id: str,
        file_name: str,
        directory: str,
    ):
        hook = AzureFileShareHook(azure_fileshare_conn_id=azure_fileshare_conn_id)
        hook.load_string(
            string_data=string_data,
            share_name=share_name,
            directory_name=directory,
            file_name=file_name,
        )

    @classmethod
    def prepare_share(cls, share_name: str, azure_fileshare_conn_id: str, file_name: str, directory: str):
        """
        Create share with a file in given directory. If directory is None, file is in root dir.
        """
        cls.create_share(share_name=share_name, azure_fileshare_conn_id=azure_fileshare_conn_id)
        cls.create_directory(
            share_name=share_name, azure_fileshare_conn_id=azure_fileshare_conn_id, directory=directory
        )
        string_data = "".join(random.choice(string.ascii_letters) for _ in range(1024))
        cls.upload_file_from_string(
            string_data=string_data,
            share_name=share_name,
            azure_fileshare_conn_id=azure_fileshare_conn_id,
            file_name=file_name,
            directory=directory,
        )