"""Updates an Plex library whenever the beets library is changed.

Plex Home users enter the Plex Token to enable updating.
Put something like the following in your config.yaml to configure:
    plex:
        host: localhost
        port: 32400
        token: token
"""

from urllib.parse import urlencode, urljoin
from xml.etree import ElementTree

import requests

from beets import config
from beets.plugins import BeetsPlugin


def get_music_section(
    host, port, token, library_name, secure, ignore_cert_errors
):
    """Getting the section key for the music library in Plex."""
    api_endpoint = append_token("library/sections", token)
    url = urljoin(
        "{}://{}:{}".format(get_protocol(secure), host, port), api_endpoint
    )

    # Sends request.
    r = requests.get(url, verify=not ignore_cert_errors)

    # Parse xml tree and extract music section key.
    tree = ElementTree.fromstring(r.content)
    for child in tree.findall("Directory"):
        if child.get("title") == library_name:
            return child.get("key")


def update_plex(host, port, token, library_name, secure, ignore_cert_errors):
    """Ignore certificate errors if configured to."""
    if ignore_cert_errors:
        import urllib3

        urllib3.disable_warnings(urllib3.exceptions.InsecureRequestWarning)
    """Sends request to the Plex api to start a library refresh.
    """
    # Getting section key and build url.
    section_key = get_music_section(
        host, port, token, library_name, secure, ignore_cert_errors
    )
    api_endpoint = f"library/sections/{section_key}/refresh"
    api_endpoint = append_token(api_endpoint, token)
    url = urljoin(
        "{}://{}:{}".format(get_protocol(secure), host, port), api_endpoint
    )

    # Sends request and returns requests object.
    r = requests.get(url, verify=not ignore_cert_errors)
    return r


def append_token(url, token):
    """Appends the Plex Home token to the api call if required."""
    if token:
        url += "?" + urlencode({"X-Plex-Token": token})
    return url


def get_protocol(secure):
    if secure:
        return "https"
    else:
        return "http"


class PlexUpdate(BeetsPlugin):
    def __init__(self):
        super().__init__()

        # Adding defaults.
        config["plex"].add(
            {
                "host": "localhost",
                "port": 32400,
                "token": "",
                "library_name": "Music",
                "secure": False,
                "ignore_cert_errors": False,
            }
        )

        config["plex"]["token"].redact = True
        self.register_listener("database_change", self.listen_for_db_change)

    def listen_for_db_change(self, lib, model):
        """Listens for beets db change and register the update for the end"""
        self.register_listener("cli_exit", self.update)

    def update(self, lib):
        """When the client exists try to send refresh request to Plex server."""
        self._log.info("Updating Plex library...")

        # Try to send update request.
        try:
            update_plex(
                config["plex"]["host"].get(),
                config["plex"]["port"].get(),
                config["plex"]["token"].get(),
                config["plex"]["library_name"].get(),
                config["plex"]["secure"].get(bool),
                config["plex"]["ignore_cert_errors"].get(bool),
            )
            self._log.info("... started.")

        except requests.exceptions.RequestException:
            self._log.warning("Update failed.")
