"""
Support for the roku media player.

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

import voluptuous as vol

from homeassistant.components.media_player import (
    MEDIA_TYPE_VIDEO, SUPPORT_NEXT_TRACK, SUPPORT_PLAY_MEDIA,
    SUPPORT_PREVIOUS_TRACK, SUPPORT_VOLUME_MUTE, SUPPORT_VOLUME_SET,
    SUPPORT_SELECT_SOURCE, SUPPORT_PLAY, MediaPlayerDevice, PLATFORM_SCHEMA)
from homeassistant.const import (
    CONF_HOST, STATE_IDLE, STATE_PLAYING, STATE_UNKNOWN, STATE_HOME)
import homeassistant.helpers.config_validation as cv

REQUIREMENTS = ['python-roku==3.1.3']

KNOWN_HOSTS = []
DEFAULT_PORT = 8060

NOTIFICATION_ID = 'roku_notification'
NOTIFICATION_TITLE = 'Roku Media Player Setup'

_LOGGER = logging.getLogger(__name__)

SUPPORT_ROKU = SUPPORT_PREVIOUS_TRACK | SUPPORT_NEXT_TRACK |\
    SUPPORT_PLAY_MEDIA | SUPPORT_VOLUME_SET | SUPPORT_VOLUME_MUTE |\
    SUPPORT_SELECT_SOURCE | SUPPORT_PLAY

PLATFORM_SCHEMA = PLATFORM_SCHEMA.extend({
    vol.Optional(CONF_HOST): cv.string,
})


def setup_platform(hass, config, add_devices, discovery_info=None):
    """Set up the Roku platform."""
    hosts = []

    if discovery_info:
        host = discovery_info.get("host")

        if host in KNOWN_HOSTS:
            return

        _LOGGER.debug("Discovered Roku: %s", host)
        hosts.append(discovery_info.get("host"))

    elif CONF_HOST in config:
        hosts.append(config.get(CONF_HOST))

    rokus = []
    for host in hosts:
        new_roku = RokuDevice(host)

        try:
            if new_roku.name is not None:
                rokus.append(RokuDevice(host))
                KNOWN_HOSTS.append(host)
            else:
                _LOGGER.error("Unable to initialize roku at %s", host)

        except AttributeError:
            _LOGGER.error("Unable to initialize roku at %s", host)
            hass.components.persistent_notification.create(
                'Error: Unable to initialize roku at {}<br />'
                'Check its network connection or consider '
                'using auto discovery.<br />'
                'You will need to restart hass after fixing.'
                ''.format(config.get(CONF_HOST)),
                title=NOTIFICATION_TITLE,
                notification_id=NOTIFICATION_ID)

    add_devices(rokus)


class RokuDevice(MediaPlayerDevice):
    """Representation of a Roku device on the network."""

    def __init__(self, host):
        """Initialize the Roku device."""
        from roku import Roku

        self.roku = Roku(host)
        self.ip_address = host
        self.channels = []
        self.current_app = None
        self.device_info = {}

        self.update()

    def update(self):
        """Retrieve latest state."""
        import requests.exceptions

        try:
            self.device_info = self.roku.device_info
            self.ip_address = self.roku.host
            self.channels = self.get_source_list()

            if self.roku.current_app is not None:
                self.current_app = self.roku.current_app
            else:
                self.current_app = None
        except (requests.exceptions.ConnectionError,
                requests.exceptions.ReadTimeout):

            pass

    def get_source_list(self):
        """Get the list of applications to be used as sources."""
        return ["Home"] + sorted(channel.name for channel in self.roku.apps)

    @property
    def should_poll(self):
        """Device should be polled."""
        return True

    @property
    def name(self):
        """Return the name of the device."""
        if self.device_info.userdevicename:
            return self.device_info.userdevicename
        return "Roku {}".format(self.device_info.sernum)

    @property
    def state(self):
        """Return the state of the device."""
        if self.current_app is None:
            return STATE_UNKNOWN

        if (self.current_app.name == "Power Saver" or
                self.current_app.is_screensaver):
            return STATE_IDLE
        elif self.current_app.name == "Roku":
            return STATE_HOME
        elif self.current_app.name is not None:
            return STATE_PLAYING

        return STATE_UNKNOWN

    @property
    def supported_features(self):
        """Flag media player features that are supported."""
        return SUPPORT_ROKU

    @property
    def media_content_type(self):
        """Content type of current playing media."""
        if self.current_app is None:
            return None
        elif self.current_app.name == "Power Saver":
            return None
        elif self.current_app.name == "Roku":
            return None
        return MEDIA_TYPE_VIDEO

    @property
    def media_image_url(self):
        """Image url of current playing media."""
        if self.current_app is None:
            return None
        elif self.current_app.name == "Roku":
            return None
        elif self.current_app.name == "Power Saver":
            return None
        elif self.current_app.id is None:
            return None

        return 'http://{0}:{1}/query/icon/{2}'.format(
            self.ip_address, DEFAULT_PORT, self.current_app.id)

    @property
    def app_name(self):
        """Name of the current running app."""
        if self.current_app is not None:
            return self.current_app.name

    @property
    def app_id(self):
        """Return the ID of the current running app."""
        if self.current_app is not None:
            return self.current_app.id

    @property
    def source(self):
        """Return the current input source."""
        if self.current_app is not None:
            return self.current_app.name

    @property
    def source_list(self):
        """List of available input sources."""
        return self.channels

    def media_play_pause(self):
        """Send play/pause command."""
        if self.current_app is not None:
            self.roku.play()

    def media_previous_track(self):
        """Send previous track command."""
        if self.current_app is not None:
            self.roku.reverse()

    def media_next_track(self):
        """Send next track command."""
        if self.current_app is not None:
            self.roku.forward()

    def mute_volume(self, mute):
        """Mute the volume."""
        if self.current_app is not None:
            self.roku.volume_mute()

    def volume_up(self):
        """Volume up media player."""
        if self.current_app is not None:
            self.roku.volume_up()

    def volume_down(self):
        """Volume down media player."""
        if self.current_app is not None:
            self.roku.volume_down()

    def select_source(self, source):
        """Select input source."""
        if self.current_app is not None:
            if source == "Home":
                self.roku.home()
            else:
                channel = self.roku[source]
                channel.launch()
