"""
GNTP (aka Growl) notification service.

For more details about this platform, please refer to the documentation at
https://home-assistant.io/components/notify.gntp/
"""
import logging
import os

import voluptuous as vol

from homeassistant.components.notify import (
    ATTR_TITLE, ATTR_TITLE_DEFAULT, PLATFORM_SCHEMA, BaseNotificationService)
from homeassistant.const import CONF_PASSWORD, CONF_PORT
import homeassistant.helpers.config_validation as cv

REQUIREMENTS = ['gntp==1.0.3']

_LOGGER = logging.getLogger(__name__)

_GNTP_LOGGER = logging.getLogger('gntp')
_GNTP_LOGGER.setLevel(logging.ERROR)


CONF_APP_NAME = 'app_name'
CONF_APP_ICON = 'app_icon'
CONF_HOSTNAME = 'hostname'

DEFAULT_APP_NAME = 'HomeAssistant'
DEFAULT_HOST = 'localhost'
DEFAULT_PORT = 23053

PLATFORM_SCHEMA = PLATFORM_SCHEMA.extend({
    vol.Optional(CONF_APP_NAME, default=DEFAULT_APP_NAME): cv.string,
    vol.Optional(CONF_APP_ICON): vol.Url,
    vol.Optional(CONF_HOSTNAME, default=DEFAULT_HOST): cv.string,
    vol.Optional(CONF_PASSWORD): cv.string,
    vol.Optional(CONF_PORT, default=DEFAULT_PORT): cv.port,
})


def get_service(hass, config, discovery_info=None):
    """Get the GNTP notification service."""
    if config.get(CONF_APP_ICON) is None:
        icon_file = os.path.join(os.path.dirname(__file__), "..", "frontend",
                                 "www_static", "icons", "favicon-192x192.png")
        app_icon = open(icon_file, 'rb').read()
    else:
        app_icon = config.get(CONF_APP_ICON)

    return GNTPNotificationService(config.get(CONF_APP_NAME),
                                   app_icon,
                                   config.get(CONF_HOSTNAME),
                                   config.get(CONF_PASSWORD),
                                   config.get(CONF_PORT))


class GNTPNotificationService(BaseNotificationService):
    """Implement the notification service for GNTP."""

    def __init__(self, app_name, app_icon, hostname, password, port):
        """Initialize the service."""
        import gntp.notifier
        import gntp.errors
        self.gntp = gntp.notifier.GrowlNotifier(
            applicationName=app_name,
            notifications=["Notification"],
            applicationIcon=app_icon,
            hostname=hostname,
            password=password,
            port=port
        )
        try:
            self.gntp.register()
        except gntp.errors.NetworkError:
            _LOGGER.error('Unable to register with the GNTP host.')
            return

    def send_message(self, message="", **kwargs):
        """Send a message to a user."""
        self.gntp.notify(noteType="Notification",
                         title=kwargs.get(ATTR_TITLE, ATTR_TITLE_DEFAULT),
                         description=message)