from google.cloud import texttospeech

# Instantiates a client
client = texttospeech.TextToSpeechClient()


def gen_speech(text, language_code, output_file):
    """Synthesizes speech from the input string of text or ssml.

    Note: ssml must be well-formed according to:
        https://www.w3.org/TR/speech-synthesis/
    """

    # Set the text input to be synthesized
    synthesis_input = texttospeech.types.SynthesisInput(text=text)

    # Build the voice request, select the language code ("en-US") and the ssml
    # voice gender ("neutral")
    voice = texttospeech.types.VoiceSelectionParams(
        language_code=language_code,
        ssml_gender=texttospeech.enums.SsmlVoiceGender.NEUTRAL)

    # Select the type of audio file you want returned
    audio_config = texttospeech.types.AudioConfig(
        audio_encoding=texttospeech.enums.AudioEncoding.MP3)

    # Perform the text-to-speech request on the text input with the selected
    # voice parameters and audio file type
    response = client.synthesize_speech(synthesis_input, voice, audio_config)

    # The response's audio_content is binary.
    with open(output_file, 'wb') as out:
        # Write the response to the output file.
        out.write(response.audio_content)