const BaseEngine = require('../BaseEngine');
const fetch = require('node-fetch');
const querystring = require('querystring');

module.exports = class extends BaseEngine {
	constructor() {
		super('watson',"IBM Watson TTS", "ogg");
		this.voices = {};
		this.populateVoiceList();
	}
	async populateVoiceList() {
		const url = process.env.watsonURL + "/v1/voices";
		const authorization = this.IBMAuthString();
		const opts = {
			method: "get",
			headers: {
				'Authorization': authorization
			},
		}
		const res = await fetch(url, opts);
		const voices = await res.json();
		voices.voices.forEach((i) => {
			let voiceName = i.description.substring(0, i.description.indexOf(':')).toLowerCase();
			this.voices[voiceName] = i.name;
		});
	}
	getDefaultVoice() {
		return 'Michael';
	}
	IBMAuthString() {
		let buff = new Buffer('apikey:' + process.env.watsonAPIKey);
		let b64auth = buff.toString('base64');
		return 'Basic ' + b64auth;
	}
	async getSpeech(text, voice = this.getSpeechVoice(), params = {}) {
		const url = process.env.watsonURL + "/v1/synthesize?voice=" + this.getInternalVoiceName(voice);
		const authorization = this.IBMAuthString();
		const opts = {
			method: "post",
			headers: {
				'Content-Type': 'application/json',
				'Authorization': authorization
			},
			body: JSON.stringify({
				text: text
			})
		};
		return fetch(url, opts);
	}
};