import json
from watson_developer_cloud import TextToSpeechV1
import time
from datetime import timedelta
import sys
import os
import argparse


#We need to get our API credentials in the code for authentication that we have stored as Environment Variables locally
TTS_USER_WATSON = os.environ.get("TTS_USER_WATSON")
TTS_PASS_WATSON = os.environ.get("TTS_PASS_WATSON")

#Following line is used to save all the console output into a text file
sys.stdout = open('speech_api_test_text_tts_output.txt', 'w')

start_time = time.monotonic()


def input_file(text_file_path):
    global text
    if os.path.isfile(text_file_path):
        with open(text_file_path, 'r') as text_file:
            text = text_file.read()
    else:
        print("File doesn't exist in the directory!")


def speech_tts():
	#Initialize TextToSpeech function using the API credentials
	tts = TextToSpeechV1(
	        username = TTS_USER_WATSON,
	        password = TTS_PASS_WATSON
	    )
	#Parameters required to send the API request
	voice = 'en-US_AllisonVoice'
	accept = 'audio/wav'

	with open('watson_test_text_tts.wav', 'wb') as audio_file:
	    audio_file.write(
	        tts.synthesize(text, voice = voice, accept = accept)) #This line will synthesize the text file and convert it into audio format and generate a '.wav' format audio file


if __name__ == '__main__':
    parser = argparse.ArgumentParser(
        description = __doc__,
        formatter_class = argparse.RawDescriptionHelpFormatter)
    parser.add_argument(
        'text_file_path',
        help = 'The complete file path of the text file you want to convert from text to speech.')
    args = parser.parse_args()

    input_file(args.text_file_path)
    speech_tts()


end_time = time.monotonic()
print("Execution_Time:", timedelta(seconds = end_time - start_time))