"""
Definition of WebDAV and CalDAV clients.
"""

from functools import lru_cache
from logging import getLogger
from os import path
from pathlib import Path
from time import sleep
from typing import Any, Iterator

from caldav import DAVClient as CalDAVclient
from caldav import Principal as CalDAVPrincipal
from webdav3.client import Client as WebDAVclient
from webdav3.client import Resource as WebDAVResource

from . import __file__ as OVD_INIT
from .async_helpers import run_in_executor
from .settings import SETTINGS

_WEBDAV_CLIENT = WebDAVclient({
    "webdav_hostname":  SETTINGS.webdav.url,
    "webdav_login":     SETTINGS.webdav.username,
    "webdav_password":  SETTINGS.webdav.password,
    "disable_check":    SETTINGS.webdav_disable_check,
})

_logger = getLogger(__name__)


def webdav_check() -> None:
    """
    Checks if base resources are available.
    """

    _logger.info(
        "Production mode is %s.",
        "enabled" if SETTINGS.production_mode else "disabled",
    )

    if SETTINGS.production_mode:
        for _ in range(SETTINGS.webdav_retries):
            if _WEBDAV_CLIENT.check(""):
                break

            _logger.warning(
                "Waiting for WebDAV connection to %s ...",
                repr(SETTINGS.webdav.url),
            )
            sleep(30)

        _logger.debug("WebDAV connection ok.")

    elif not _WEBDAV_CLIENT.check(""):
        _logger.error(
            "WebDAV connection to %s FAILED!",
            repr(SETTINGS.webdav.url),
        )
        raise ConnectionError(SETTINGS.webdav.url)

    _logger.debug("WebDAV connection ok.")

    if not _WEBDAV_CLIENT.check(SETTINGS.webdav_prefix):
        _logger.error(
            "WebDAV prefix directory %s NOT FOUND, please create it!",
            repr(SETTINGS.webdav_prefix),
        )
        raise FileNotFoundError(SETTINGS.webdav_prefix)

    _logger.debug("WebDAV prefix directory found.")


def webdav_ensure_path(remote_path: str) -> bool:
    remote_path = f"{SETTINGS.webdav_prefix}/{remote_path}"

    if _WEBDAV_CLIENT.check(remote_path):
        _logger.debug(
            "WebDAV path %s found.",
            repr(remote_path),
        )
        return True

    _logger.info(
        "WebDAV path %s not found, creating ...",
        repr(remote_path),
    )
    _WEBDAV_CLIENT.mkdir(remote_path)

    return False


def get_skel_path(skel_file: str) -> Path:
    skel_path = path.dirname(Path(OVD_INIT).absolute())
    return Path(skel_path).joinpath("skel", skel_file)


def webdav_upload_skel(remote_path: str, *skel_files: str) -> None:
    remote_path = f"{SETTINGS.webdav_prefix}/{remote_path}"

    for skel_file in skel_files:
        _logger.debug(
            "Creating WebDAV file %s ...",
            repr(skel_file),
        )

        _WEBDAV_CLIENT.upload_file(
            f"{remote_path}/{skel_file}",
            get_skel_path(skel_file),
        )


def webdav_ensure_files(remote_path: str, *file_names: str) -> None:
    missing_files = (
        file_name
        for file_name in file_names
        if not _WEBDAV_CLIENT.check(path.join(
            SETTINGS.webdav_prefix,
            remote_path,
            file_name,
        ))
    )

    webdav_upload_skel(
        remote_path,
        *missing_files,
    )


@lru_cache(maxsize=SETTINGS.cache_size)
def webdav_resource(remote_path: Any) -> WebDAVResource:
    """
    Gets a resource using the main WebDAV client.
    """

    return _WEBDAV_CLIENT.resource(
        f"{SETTINGS.webdav_prefix}/{remote_path}"
    )


@run_in_executor
def webdav_list(remote_path: str) -> list[str]:
    """
    Asynchronously lists a WebDAV path using the main WebDAV client.
    """

    return _WEBDAV_CLIENT.list(
        f"{SETTINGS.webdav_prefix}/{remote_path}"
    )


_CALDAV_CLIENT = CalDAVclient(
    url=SETTINGS.caldav.url,
    username=SETTINGS.caldav.username,
    password=SETTINGS.caldav.password,
)


def caldav_principal() -> CalDAVPrincipal:
    """
    Gets the `Principal` object of the main CalDAV client.
    """

    return _CALDAV_CLIENT.principal()


@run_in_executor
def caldav_list() -> Iterator[str]:
    """
    Asynchronously lists all calendars using the main WebDAV client.
    """

    return (
        str(cal.name)
        for cal in caldav_principal().calendars()
    )