import { TTSModule, TTSResponse } from '../tts';

import * as https from 'https';

import GOOGLE_TTS_VOICES from './google_voices.json';
const GOOGLE_TTS_ENDPOINT = 'translate.google.com';
const USER_AGENT =
	'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/58.0.3029.110 Safari/537.3';

const ttsGoogle: TTSModule = {
	name: 'Google',
	getVoices: async (): Promise<string[]> => GOOGLE_TTS_VOICES.voices,

	generate: async (voice: string, text: string): Promise<TTSResponse> => {
		const query = new URLSearchParams({
			ie: 'UTF-8',
			q: text,
			tl: voice,
			client: 'tw-ob'
		});

		const options: https.RequestOptions = {
			hostname: GOOGLE_TTS_ENDPOINT,
			path: `/translate_tts?${query.toString()}`,
			method: 'GET',
			headers: {
				'User-Agent': USER_AGENT
			}
		};

		return new Promise((resolve) => {
			const req = https.get(options, (res) => {
				const chunks: Buffer[] = [];
				res.on('data', (chunk) => chunks.push(chunk));
				res.on('end', () => resolve({ data: Buffer.concat(chunks) }));
			});

			req.on('error', (err) => resolve({ error: err.message }));
			req.on('timeout', () => {
				req.destroy();
				resolve({ error: 'timed out' });
			});
		});
	}
};

export default ttsGoogle;