"""Module handling IFTTT notifications."""


from typing import List
import os
import requests


class Notifier:
    """A notifier object that can send IFTTT notifications."""

    # (positive, negative)
    _EVENTS = {
        "backup": (
            "Backup for {name} succeeded.",
            "Backup for {name} failed.",
        ),
        "restore": (
            "{name} successfully restored.",
            "Couldn't restore {name}.",
        ),
    }
    """The message content for a given event."""

    # Placeholder
    def __init__(
        self, title: str, events: List[str], endpoint: str, api_key: str = None
    ):
        """Initialize a new Notifier object.

        Args:
            title: the notification title to use
            events: the event types that should trigger a notification (should
                be one of the keys in _EVENTS).
            endpoint: IFTTT endpoint name
            api_key: your IFTTT API key. If not provided, it will be read from
                the IFTTT_API_KEY environment variable.

        Todo:
            * Read the API key on init
        """
        self.title = title
        self.events = events
        self.endpoint = endpoint
        self.api_key = api_key

    def notify(self, category: str, name: str, status_code: int):
        """Send an IFTTT notification.

        Args:
            category: type of notify (should be one of the keys in _EVENTS).
                Only if the category was passed during initialization will the
                notification be sent.
            name: name of the spec
            status_code: exit code of the command
        """
        event = "{}_{}".format(
            category, "success" if status_code == 0 else "failure"
        )

        # stop if it's not a valid event
        if event not in self._EVENTS:
            return

        api_key = self.api_key or os.environ["IFTTT_API_KEY"]

        # Can't do anything without a key
        if not api_key:
            return

        url = " https://maker.ifttt.com/trigger/{}/with/key/{}".format(
            self.endpoint, api_key
        )

        data = {
            "value1": self.title,
            "value2": self._EVENTS[event][int(status_code != 0)],
        }

        requests.post(url, data=data)