"""
Support for Axis devices.

For more details about this component, please refer to the documentation at
https://home-assistant.io/components/axis/
"""

import logging
import os

import voluptuous as vol

from homeassistant.components.discovery import SERVICE_AXIS
from homeassistant.config import load_yaml_config_file
from homeassistant.const import (ATTR_LOCATION, ATTR_TRIPPED,
                                 CONF_EVENT, CONF_HOST, CONF_INCLUDE,
                                 CONF_NAME, CONF_PASSWORD, CONF_PORT,
                                 CONF_TRIGGER_TIME, CONF_USERNAME,
                                 EVENT_HOMEASSISTANT_STOP)
from homeassistant.helpers import config_validation as cv
from homeassistant.helpers import discovery
from homeassistant.helpers.dispatcher import dispatcher_send
from homeassistant.helpers.entity import Entity
from homeassistant.util.json import load_json, save_json


REQUIREMENTS = ['axis==14']

_LOGGER = logging.getLogger(__name__)

DOMAIN = 'axis'
CONFIG_FILE = 'axis.conf'

AXIS_DEVICES = {}

EVENT_TYPES = ['motion', 'vmd3', 'pir', 'sound',
               'daynight', 'tampering', 'input']

PLATFORMS = ['camera']

AXIS_INCLUDE = EVENT_TYPES + PLATFORMS

AXIS_DEFAULT_HOST = '192.168.0.90'
AXIS_DEFAULT_USERNAME = 'root'
AXIS_DEFAULT_PASSWORD = 'pass'

DEVICE_SCHEMA = vol.Schema({
    vol.Required(CONF_INCLUDE):
        vol.All(cv.ensure_list, [vol.In(AXIS_INCLUDE)]),
    vol.Optional(CONF_NAME): cv.string,
    vol.Optional(CONF_HOST, default=AXIS_DEFAULT_HOST): cv.string,
    vol.Optional(CONF_USERNAME, default=AXIS_DEFAULT_USERNAME): cv.string,
    vol.Optional(CONF_PASSWORD, default=AXIS_DEFAULT_PASSWORD): cv.string,
    vol.Optional(CONF_TRIGGER_TIME, default=0): cv.positive_int,
    vol.Optional(CONF_PORT, default=80): cv.positive_int,
    vol.Optional(ATTR_LOCATION, default=''): cv.string,
})

CONFIG_SCHEMA = vol.Schema({
    DOMAIN: vol.Schema({
        cv.slug: DEVICE_SCHEMA,
    }),
}, extra=vol.ALLOW_EXTRA)

SERVICE_VAPIX_CALL = 'vapix_call'
SERVICE_VAPIX_CALL_RESPONSE = 'vapix_call_response'
SERVICE_CGI = 'cgi'
SERVICE_ACTION = 'action'
SERVICE_PARAM = 'param'
SERVICE_DEFAULT_CGI = 'param.cgi'
SERVICE_DEFAULT_ACTION = 'update'

SERVICE_SCHEMA = vol.Schema({
    vol.Required(CONF_NAME): cv.string,
    vol.Required(SERVICE_PARAM): cv.string,
    vol.Optional(SERVICE_CGI, default=SERVICE_DEFAULT_CGI): cv.string,
    vol.Optional(SERVICE_ACTION, default=SERVICE_DEFAULT_ACTION): cv.string,
})


def request_configuration(hass, config, name, host, serialnumber):
    """Request configuration steps from the user."""
    configurator = hass.components.configurator

    def configuration_callback(callback_data):
        """Called when config is submitted."""
        if CONF_INCLUDE not in callback_data:
            configurator.notify_errors(request_id,
                                       "Functionality mandatory.")
            return False

        callback_data[CONF_INCLUDE] = callback_data[CONF_INCLUDE].split()
        callback_data[CONF_HOST] = host

        if CONF_NAME not in callback_data:
            callback_data[CONF_NAME] = name

        try:
            device_config = DEVICE_SCHEMA(callback_data)
        except vol.Invalid:
            configurator.notify_errors(request_id,
                                       "Bad input, please check spelling.")
            return False

        if setup_device(hass, config, device_config):
            config_file = load_json(hass.config.path(CONFIG_FILE))
            config_file[serialnumber] = dict(device_config)
            save_json(hass.config.path(CONFIG_FILE), config_file)
            configurator.request_done(request_id)
        else:
            configurator.notify_errors(request_id,
                                       "Failed to register, please try again.")
            return False

    title = '{} ({})'.format(name, host)
    request_id = configurator.request_config(
        title, configuration_callback,
        description='Functionality: ' + str(AXIS_INCLUDE),
        entity_picture="/static/images/logo_axis.png",
        link_name='Axis platform documentation',
        link_url='https://home-assistant.io/components/axis/',
        submit_caption="Confirm",
        fields=[
            {'id': CONF_NAME,
             'name': "Device name",
             'type': 'text'},
            {'id': CONF_USERNAME,
             'name': "User name",
             'type': 'text'},
            {'id': CONF_PASSWORD,
             'name': 'Password',
             'type': 'password'},
            {'id': CONF_INCLUDE,
             'name': "Device functionality (space separated list)",
             'type': 'text'},
            {'id': ATTR_LOCATION,
             'name': "Physical location of device (optional)",
             'type': 'text'},
            {'id': CONF_PORT,
             'name': "HTTP port (default=80)",
             'type': 'number'},
            {'id': CONF_TRIGGER_TIME,
             'name': "Sensor update interval (optional)",
             'type': 'number'},
        ]
    )


def setup(hass, config):
    """Common setup for Axis devices."""
    def _shutdown(call):  # pylint: disable=unused-argument
        """Stop the event stream on shutdown."""
        for serialnumber, device in AXIS_DEVICES.items():
            _LOGGER.info("Stopping event stream for %s.", serialnumber)
            device.stop()

    hass.bus.listen_once(EVENT_HOMEASSISTANT_STOP, _shutdown)

    def axis_device_discovered(service, discovery_info):
        """Called when axis devices has been found."""
        host = discovery_info[CONF_HOST]
        name = discovery_info['hostname']
        serialnumber = discovery_info['properties']['macaddress']

        if serialnumber not in AXIS_DEVICES:
            config_file = load_json(hass.config.path(CONFIG_FILE))
            if serialnumber in config_file:
                # Device config previously saved to file
                try:
                    device_config = DEVICE_SCHEMA(config_file[serialnumber])
                    device_config[CONF_HOST] = host
                except vol.Invalid as err:
                    _LOGGER.error("Bad data from %s. %s", CONFIG_FILE, err)
                    return False
                if not setup_device(hass, config, device_config):
                    _LOGGER.error("Couldn\'t set up %s",
                                  device_config[CONF_NAME])
            else:
                # New device, create configuration request for UI
                request_configuration(hass, config, name, host, serialnumber)
        else:
            # Device already registered, but on a different IP
            device = AXIS_DEVICES[serialnumber]
            device.config.host = host
            dispatcher_send(hass, DOMAIN + '_' + device.name + '_new_ip', host)

    # Register discovery service
    discovery.listen(hass, SERVICE_AXIS, axis_device_discovered)

    if DOMAIN in config:
        for device in config[DOMAIN]:
            device_config = config[DOMAIN][device]
            if CONF_NAME not in device_config:
                device_config[CONF_NAME] = device
            if not setup_device(hass, config, device_config):
                _LOGGER.error("Couldn\'t set up %s", device_config[CONF_NAME])

    # Services to communicate with device.
    descriptions = load_yaml_config_file(
        os.path.join(os.path.dirname(__file__), 'services.yaml'))

    def vapix_service(call):
        """Service to send a message."""
        for _, device in AXIS_DEVICES.items():
            if device.name == call.data[CONF_NAME]:
                response = device.vapix.do_request(
                    call.data[SERVICE_CGI],
                    call.data[SERVICE_ACTION],
                    call.data[SERVICE_PARAM])
                hass.bus.fire(SERVICE_VAPIX_CALL_RESPONSE, response)
                return True
        _LOGGER.info("Couldn\'t find device %s", call.data[CONF_NAME])
        return False

    # Register service with Home Assistant.
    hass.services.register(DOMAIN,
                           SERVICE_VAPIX_CALL,
                           vapix_service,
                           descriptions[DOMAIN][SERVICE_VAPIX_CALL],
                           schema=SERVICE_SCHEMA)
    return True


def setup_device(hass, config, device_config):
    """Set up device."""
    from axis import AxisDevice

    def signal_callback(action, event):
        """Callback to configure events when initialized on event stream."""
        if action == 'add':
            event_config = {
                CONF_EVENT: event,
                CONF_NAME: device_config[CONF_NAME],
                ATTR_LOCATION: device_config[ATTR_LOCATION],
                CONF_TRIGGER_TIME: device_config[CONF_TRIGGER_TIME]
            }
            component = event.event_platform
            discovery.load_platform(hass,
                                    component,
                                    DOMAIN,
                                    event_config,
                                    config)

    event_types = list(filter(lambda x: x in device_config[CONF_INCLUDE],
                              EVENT_TYPES))
    device_config['events'] = event_types
    device_config['signal'] = signal_callback
    device = AxisDevice(hass.loop, **device_config)
    device.name = device_config[CONF_NAME]

    if device.serial_number is None:
        # If there is no serial number a connection could not be made
        _LOGGER.error("Couldn\'t connect to %s", device_config[CONF_HOST])
        return False

    for component in device_config[CONF_INCLUDE]:
        if component == 'camera':
            camera_config = {
                CONF_NAME: device_config[CONF_NAME],
                CONF_HOST: device_config[CONF_HOST],
                CONF_PORT: device_config[CONF_PORT],
                CONF_USERNAME: device_config[CONF_USERNAME],
                CONF_PASSWORD: device_config[CONF_PASSWORD]
            }
            discovery.load_platform(hass,
                                    component,
                                    DOMAIN,
                                    camera_config,
                                    config)

    AXIS_DEVICES[device.serial_number] = device
    if event_types:
        hass.add_job(device.start)
    return True


class AxisDeviceEvent(Entity):
    """Representation of a Axis device event."""

    def __init__(self, event_config):
        """Initialize the event."""
        self.axis_event = event_config[CONF_EVENT]
        self._name = '{}_{}_{}'.format(event_config[CONF_NAME],
                                       self.axis_event.event_type,
                                       self.axis_event.id)
        self.location = event_config[ATTR_LOCATION]
        self.axis_event.callback = self._update_callback

    def _update_callback(self):
        """Update the sensor's state, if needed."""
        self.update()
        self.schedule_update_ha_state()

    @property
    def name(self):
        """Return the name of the event."""
        return self._name

    @property
    def device_class(self):
        """Return the class of the event."""
        return self.axis_event.event_class

    @property
    def should_poll(self):
        """No polling needed."""
        return False

    @property
    def device_state_attributes(self):
        """Return the state attributes of the event."""
        attr = {}

        tripped = self.axis_event.is_tripped
        attr[ATTR_TRIPPED] = 'True' if tripped else 'False'

        attr[ATTR_LOCATION] = self.location

        return attr
