"""
Implements the DIAL-protocol to communicate with the Chromecast
"""
from collections import namedtuple
from uuid import UUID

import logging
import requests

from .discovery import get_info_from_service, get_host_from_service_info

XML_NS_UPNP_DEVICE = "{urn:schemas-upnp-org:device-1-0}"

FORMAT_BASE_URL = "http://{}:8008"

CC_SESSION = requests.Session()
CC_SESSION.headers['content-type'] = 'application/json'

# Regular chromecast, supports video/audio
CAST_TYPE_CHROMECAST = 'cast'
# Cast Audio device, supports only audio
CAST_TYPE_AUDIO = 'audio'
# Cast Audio group device, supports only audio
CAST_TYPE_GROUP = 'group'

CAST_TYPES = {
    'chromecast': CAST_TYPE_CHROMECAST,
    'eureka dongle': CAST_TYPE_CHROMECAST,
    'chromecast audio': CAST_TYPE_AUDIO,
    'google home': CAST_TYPE_AUDIO,
    'google cast group': CAST_TYPE_GROUP,
}

_LOGGER = logging.getLogger(__name__)


def reboot(host):
    """ Reboots the chromecast. """
    CC_SESSION.post(FORMAT_BASE_URL.format(host) + "/setup/reboot",
                    data='{"params":"now"}', timeout=10)


def _get_status(host, services, zconf, path):
    """
    :param host: Hostname or ip to fetch status from
    :type host: str
    :return: The device status as a named tuple.
    :rtype: pychromecast.dial.DeviceStatus or None
    """

    if not host:
        for service in services.copy():
            service_info = get_info_from_service(service, zconf)
            host, _ = get_host_from_service_info(service_info)
            if host:
                _LOGGER.debug("Resolved service %s to %s", service, host)
                break

    req = CC_SESSION.get(FORMAT_BASE_URL.format(host) + path, timeout=10)

    req.raise_for_status()

    # The Requests library will fall back to guessing the encoding in case
    # no encoding is specified in the response headers - which is the case
    # for the Chromecast.
    # The standard mandates utf-8 encoding, let's fall back to that instead
    # if no encoding is provided, since the autodetection does not always
    # provide correct results.
    if req.encoding is None:
        req.encoding = 'utf-8'

    return req.json()


def get_device_status(host, services=None, zconf=None):
    """
    :param host: Hostname or ip to fetch status from
    :type host: str
    :return: The device status as a named tuple.
    :rtype: pychromecast.dial.DeviceStatus or None
    """

    try:
        status = _get_status(
            host, services, zconf, "/setup/eureka_info?options=detail")

        friendly_name = status.get('name', "Unknown Chromecast")
        model_name = "Unknown model name"
        manufacturer = "Unknown manufacturer"
        if 'detail' in status:
            model_name = status['detail'].get('model_name', model_name)
            manufacturer = status['detail'].get('manufacturer', manufacturer)

        udn = status.get('ssdp_udn', None)

        cast_type = CAST_TYPES.get(model_name.lower(),
                                   CAST_TYPE_CHROMECAST)

        uuid = None
        if udn:
            uuid = UUID(udn.replace('-', ''))

        return DeviceStatus(friendly_name, model_name, manufacturer,
                            uuid, cast_type)

    except (requests.exceptions.RequestException, OSError, ValueError):
        return None


def get_multizone_status(host, services=None, zconf=None):
    """
    :param host: Hostname or ip to fetch status from
    :type host: str
    :return: The multizone status as a named tuple.
    :rtype: pychromecast.dial.MultizoneStatus or None
    """

    try:
        status = status = _get_status(
            host, services, zconf, "/setup/eureka_info?params=multizone")

        dynamic_groups = []
        if 'multizone' in status and 'dynamic_groups' in status['multizone']:
            for group in status['multizone']['dynamic_groups']:
                name = group.get('name', "Unknown group name")
                udn = group.get('uuid', None)
                uuid = None
                if udn:
                    uuid = UUID(udn.replace('-', ''))
                dynamic_groups.append(MultizoneInfo(name, uuid))

        groups = []
        if 'multizone' in status and 'groups' in status['multizone']:
            for group in status['multizone']['groups']:
                name = group.get('name', "Unknown group name")
                udn = group.get('uuid', None)
                uuid = None
                if udn:
                    uuid = UUID(udn.replace('-', ''))
                groups.append(MultizoneInfo(name, uuid))

        return MultizoneStatus(dynamic_groups, groups)

    except (requests.exceptions.RequestException, OSError, ValueError):
        return None


DeviceStatus = namedtuple(
    "DeviceStatus",
    ["friendly_name", "model_name", "manufacturer", "uuid", "cast_type"])

MultizoneInfo = namedtuple(
    "MultizoneInfo",
    ["friendly_name", "uuid"])

MultizoneStatus = namedtuple(
    "MultizoneStatus",
    ["dynamic_groups", "groups"])
