"""
Support for the Amazon Polly text to speech service.

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

from homeassistant.components.tts import Provider, PLATFORM_SCHEMA
import homeassistant.helpers.config_validation as cv

_LOGGER = logging.getLogger(__name__)
REQUIREMENTS = ["boto3==1.4.3"]

CONF_REGION = "region_name"
CONF_ACCESS_KEY_ID = "aws_access_key_id"
CONF_SECRET_ACCESS_KEY = "aws_secret_access_key"
CONF_PROFILE_NAME = "profile_name"
ATTR_CREDENTIALS = "credentials"

DEFAULT_REGION = "us-east-1"
SUPPORTED_REGIONS = ["us-east-1", "us-east-2", "us-west-2", "eu-west-1"]

CONF_VOICE = "voice"
CONF_OUTPUT_FORMAT = "output_format"
CONF_SAMPLE_RATE = "sample_rate"
CONF_TEXT_TYPE = "text_type"

SUPPORTED_VOICES = ["Geraint", "Gwyneth", "Mads", "Naja", "Hans", "Marlene",
                    "Nicole", "Russell", "Amy", "Brian", "Emma", "Raveena",
                    "Ivy", "Joanna", "Joey", "Justin", "Kendra", "Kimberly",
                    "Salli", "Conchita", "Enrique", "Miguel", "Penelope",
                    "Chantal", "Celine", "Mathieu", "Dora", "Karl", "Carla",
                    "Giorgio", "Mizuki", "Liv", "Lotte", "Ruben", "Ewa",
                    "Jacek", "Jan", "Maja", "Ricardo", "Vitoria", "Cristiano",
                    "Ines", "Carmen", "Maxim", "Tatyana", "Astrid", "Filiz"]

SUPPORTED_OUTPUT_FORMATS = ["mp3", "ogg_vorbis", "pcm"]

SUPPORTED_SAMPLE_RATES = ["8000", "16000", "22050"]

SUPPORTED_SAMPLE_RATES_MAP = {
    "mp3": ["8000", "16000", "22050"],
    "ogg_vorbis": ["8000", "16000", "22050"],
    "pcm": ["8000", "16000"]
}

SUPPORTED_TEXT_TYPES = ["text", "ssml"]

CONTENT_TYPE_EXTENSIONS = {
    "audio/mpeg": "mp3",
    "audio/ogg": "ogg",
    "audio/pcm": "pcm"
}

DEFAULT_VOICE = "Joanna"
DEFAULT_OUTPUT_FORMAT = "mp3"
DEFAULT_TEXT_TYPE = "text"

DEFAULT_SAMPLE_RATES = {
    "mp3": "22050",
    "ogg_vorbis": "22050",
    "pcm": "16000"
}

PLATFORM_SCHEMA = PLATFORM_SCHEMA.extend({
    vol.Optional(CONF_REGION, default=DEFAULT_REGION):
        vol.In(SUPPORTED_REGIONS),
    vol.Inclusive(CONF_ACCESS_KEY_ID, ATTR_CREDENTIALS): cv.string,
    vol.Inclusive(CONF_SECRET_ACCESS_KEY, ATTR_CREDENTIALS): cv.string,
    vol.Exclusive(CONF_PROFILE_NAME, ATTR_CREDENTIALS): cv.string,
    vol.Optional(CONF_VOICE, default=DEFAULT_VOICE): vol.In(SUPPORTED_VOICES),
    vol.Optional(CONF_OUTPUT_FORMAT, default=DEFAULT_OUTPUT_FORMAT):
        vol.In(SUPPORTED_OUTPUT_FORMATS),
    vol.Optional(CONF_SAMPLE_RATE): vol.All(cv.string,
                                            vol.In(SUPPORTED_SAMPLE_RATES)),
    vol.Optional(CONF_TEXT_TYPE, default=DEFAULT_TEXT_TYPE):
        vol.In(SUPPORTED_TEXT_TYPES),
})


def get_engine(hass, config):
    """Set up Amazon Polly speech component."""
    # pylint: disable=import-error
    output_format = config.get(CONF_OUTPUT_FORMAT)
    sample_rate = config.get(CONF_SAMPLE_RATE,
                             DEFAULT_SAMPLE_RATES[output_format])
    if sample_rate not in SUPPORTED_SAMPLE_RATES_MAP.get(output_format):
        _LOGGER.error("%s is not a valid sample rate for %s",
                      sample_rate, output_format)
        return None

    config[CONF_SAMPLE_RATE] = sample_rate

    import boto3

    profile = config.get(CONF_PROFILE_NAME)

    if profile is not None:
        boto3.setup_default_session(profile_name=profile)

    aws_config = {
        CONF_REGION: config.get(CONF_REGION),
        CONF_ACCESS_KEY_ID: config.get(CONF_ACCESS_KEY_ID),
        CONF_SECRET_ACCESS_KEY: config.get(CONF_SECRET_ACCESS_KEY),
    }

    del config[CONF_REGION]
    del config[CONF_ACCESS_KEY_ID]
    del config[CONF_SECRET_ACCESS_KEY]

    polly_client = boto3.client("polly", **aws_config)

    supported_languages = []

    all_voices = {}

    all_voices_req = polly_client.describe_voices()

    for voice in all_voices_req.get("Voices"):
        all_voices[voice.get("Id")] = voice
        if voice.get("LanguageCode") not in supported_languages:
            supported_languages.append(voice.get("LanguageCode"))

    return AmazonPollyProvider(polly_client, config, supported_languages,
                               all_voices)


class AmazonPollyProvider(Provider):
    """Amazon Polly speech api provider."""

    def __init__(self, polly_client, config, supported_languages,
                 all_voices):
        """Initialize Amazon Polly provider for TTS."""
        self.client = polly_client
        self.config = config
        self.supported_langs = supported_languages
        self.all_voices = all_voices
        self.default_voice = self.config.get(CONF_VOICE)
        self.name = 'Amazon Polly'

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

    @property
    def default_language(self):
        """Default language."""
        return self.all_voices.get(self.default_voice).get("LanguageCode")

    @property
    def default_options(self):
        """Dict include default options."""
        return {CONF_VOICE: self.default_voice}

    @property
    def supported_options(self):
        """List of supported options."""
        return [CONF_VOICE]

    def get_tts_audio(self, message, language=None, options=None):
        """Request TTS file from Polly."""
        voice_id = options.get(CONF_VOICE, self.default_voice)
        voice_in_dict = self.all_voices.get(voice_id)
        if language is not voice_in_dict.get("LanguageCode"):
            _LOGGER.error("%s does not support the %s language",
                          voice_id, language)
            return (None, None)

        resp = self.client.synthesize_speech(
            OutputFormat=self.config[CONF_OUTPUT_FORMAT],
            SampleRate=self.config[CONF_SAMPLE_RATE],
            Text=message,
            TextType=self.config[CONF_TEXT_TYPE],
            VoiceId=voice_id
        )

        return (CONTENT_TYPE_EXTENSIONS[resp.get("ContentType")],
                resp.get("AudioStream").read())
