"""
Support for the voicerss speech service.

For more details about this component, please refer to the documentation at
https://home-assistant.io/components/tts.voicerss/
"""
import asyncio
import logging

import aiohttp
import async_timeout
import voluptuous as vol

from homeassistant.const import CONF_API_KEY
from homeassistant.components.tts import Provider, PLATFORM_SCHEMA, CONF_LANG
from homeassistant.helpers.aiohttp_client import async_get_clientsession
import homeassistant.helpers.config_validation as cv


_LOGGER = logging.getLogger(__name__)

VOICERSS_API_URL = "https://api.voicerss.org/"

ERROR_MSG = [
    b'Error description',
    b'The subscription is expired or requests count limitation is exceeded!',
    b'The request content length is too large!',
    b'The language does not support!',
    b'The language is not specified!',
    b'The text is not specified!',
    b'The API key is not available!',
    b'The API key is not specified!',
    b'The subscription does not support SSML!',
]

SUPPORT_LANGUAGES = [
    'ca-es', 'zh-cn', 'zh-hk', 'zh-tw', 'da-dk', 'nl-nl', 'en-au', 'en-ca',
    'en-gb', 'en-in', 'en-us', 'fi-fi', 'fr-ca', 'fr-fr', 'de-de', 'it-it',
    'ja-jp', 'ko-kr', 'nb-no', 'pl-pl', 'pt-br', 'pt-pt', 'ru-ru', 'es-mx',
    'es-es', 'sv-se',
]

SUPPORT_CODECS = [
    'mp3', 'wav', 'aac', 'ogg', 'caf'
]

SUPPORT_FORMATS = [
    '8khz_8bit_mono', '8khz_8bit_stereo', '8khz_16bit_mono',
    '8khz_16bit_stereo', '11khz_8bit_mono', '11khz_8bit_stereo',
    '11khz_16bit_mono', '11khz_16bit_stereo', '12khz_8bit_mono',
    '12khz_8bit_stereo', '12khz_16bit_mono', '12khz_16bit_stereo',
    '16khz_8bit_mono', '16khz_8bit_stereo', '16khz_16bit_mono',
    '16khz_16bit_stereo', '22khz_8bit_mono', '22khz_8bit_stereo',
    '22khz_16bit_mono', '22khz_16bit_stereo', '24khz_8bit_mono',
    '24khz_8bit_stereo', '24khz_16bit_mono', '24khz_16bit_stereo',
    '32khz_8bit_mono', '32khz_8bit_stereo', '32khz_16bit_mono',
    '32khz_16bit_stereo', '44khz_8bit_mono', '44khz_8bit_stereo',
    '44khz_16bit_mono', '44khz_16bit_stereo', '48khz_8bit_mono',
    '48khz_8bit_stereo', '48khz_16bit_mono', '48khz_16bit_stereo',
    'alaw_8khz_mono', 'alaw_8khz_stereo', 'alaw_11khz_mono',
    'alaw_11khz_stereo', 'alaw_22khz_mono', 'alaw_22khz_stereo',
    'alaw_44khz_mono', 'alaw_44khz_stereo', 'ulaw_8khz_mono',
    'ulaw_8khz_stereo', 'ulaw_11khz_mono', 'ulaw_11khz_stereo',
    'ulaw_22khz_mono', 'ulaw_22khz_stereo', 'ulaw_44khz_mono',
    'ulaw_44khz_stereo',
]

CONF_CODEC = 'codec'
CONF_FORMAT = 'format'

DEFAULT_LANG = 'en-us'
DEFAULT_CODEC = 'mp3'
DEFAULT_FORMAT = '8khz_8bit_mono'


PLATFORM_SCHEMA = PLATFORM_SCHEMA.extend({
    vol.Required(CONF_API_KEY): cv.string,
    vol.Optional(CONF_LANG, default=DEFAULT_LANG): vol.In(SUPPORT_LANGUAGES),
    vol.Optional(CONF_CODEC, default=DEFAULT_CODEC): vol.In(SUPPORT_CODECS),
    vol.Optional(CONF_FORMAT, default=DEFAULT_FORMAT): vol.In(SUPPORT_FORMATS),
})


@asyncio.coroutine
def async_get_engine(hass, config):
    """Set up VoiceRSS TTS component."""
    return VoiceRSSProvider(hass, config)


class VoiceRSSProvider(Provider):
    """The VoiceRSS speech API provider."""

    def __init__(self, hass, conf):
        """Init VoiceRSS TTS service."""
        self.hass = hass
        self._extension = conf[CONF_CODEC]
        self._lang = conf[CONF_LANG]
        self.name = 'VoiceRSS'

        self._form_data = {
            'key': conf[CONF_API_KEY],
            'hl': conf[CONF_LANG],
            'c': (conf[CONF_CODEC]).upper(),
            'f': conf[CONF_FORMAT],
        }

    @property
    def default_language(self):
        """Default language."""
        return self._lang

    @property
    def supported_languages(self):
        """List of supported languages."""
        return SUPPORT_LANGUAGES

    @asyncio.coroutine
    def async_get_tts_audio(self, message, language, options=None):
        """Load TTS from VoiceRSS."""
        websession = async_get_clientsession(self.hass)
        form_data = self._form_data.copy()

        form_data['src'] = message
        form_data['hl'] = language

        request = None
        try:
            with async_timeout.timeout(10, loop=self.hass.loop):
                request = yield from websession.post(
                    VOICERSS_API_URL, data=form_data
                )

                if request.status != 200:
                    _LOGGER.error("Error %d on load url %s.",
                                  request.status, request.url)
                    return (None, None)
                data = yield from request.read()

                if data in ERROR_MSG:
                    _LOGGER.error(
                        "Error receive %s from VoiceRSS", str(data, 'utf-8'))
                    return (None, None)

        except (asyncio.TimeoutError, aiohttp.errors.ClientError):
            _LOGGER.error("Timeout for VoiceRSS API")
            return (None, None)

        finally:
            if request is not None:
                yield from request.release()

        return (self._extension, data)
