const Asset = require('./asset');
const Request = require('request');
const async = require('async');
const utils = require('./utils');
const fs = require('fs');
const path = require('path');

class Simulator {

	constructor(configs) {

		this.configs = configs;
		this.token;

		this.assets = configs.assets;
		this.assetIds = this.assets.map(asset => asset.asset_id);

		this.apiEndpoint = this.configs.api.use_secure ? 'https' : 'http';
		this.apiEndpoint += '://' +  this.configs.api.host + (this.configs.api.port ? (':' + this.configs.api.port) : '');

		async.waterfall([
			this._manageLogs.bind(this),
			this._unregisterAsstes.bind(this),
			this._getToken.bind(this),
		],
		(err, result) => {
			if(err) {
				console.log(err)
				return;
			}
			utils.writeLog(`Using token: ${this.token}`);
			this._start();
		});
	}

	_start() {
		const settings = this.configs.settings;

		this.assets.forEach((asset, i) => {
			console.log('asset_id', asset.asset_id, i * settings.delay_between_clients + 'ms');
			setTimeout(() => {
				new Asset(asset, this.configs, this.token);
			}, i * settings.delay_between_clients);
		})
	}

	_getRandomInt(max) {
		return Math.floor(Math.random() * Math.floor(max))
	}

	_manageLogs(callback) {
		try {
			fs.unlinkSync(path.join('logs/', 'error_'+this.configs.elogs.name+'.log'), err => {
			if (err) throw err;
			});
			fs.unlinkSync(path.join('logs/', 'simulator_'+this.configs.elogs.name+'.log'), err => {
			if (err) throw err;
			});
		} catch(e) { console.log(e) }
			fs.openSync('./logs/simulator_'+this.configs.elogs.name+'.log', 'w');
			utils.writeLog('START');
			utils.writeLog(`process.env["NODE_CONFIG_DIR"]: ${process.env["NODE_CONFIG_DIR"]}`);

			fs.openSync('./logs/error_'+this.configs.elogs.name+'.log', 'w');

		return callback();
	}

	_unregisterAsstes(callback) {

		let url = this.apiEndpoint + '/audio/un-register/[' + this.assetIds + ']/';
		Request.post(
			url,
			{timeout: 15000},
			(error, response, body) => {
				if(error) {
					utils.writeLog(`ERROR can't unregister users ${this.assetIds}`, error);
					utils.writeErrorLog(`ERROR_API`);
					return callback(error);
				}
				else {
					utils.writeLog(`Unregister assets: ${this.assetIds}`);
					return callback();
				}
			}
		);
	}

	_getToken(callback) {
		let url = this.apiEndpoint + '/generate-token';
		Request.get(
			url,
			{timeout: 15000},
			(error, response, body) => {
				if(error) {
					utils.writeLog(`ERROR can't get token`, error);
					utils.writeErrorLog(`ERROR_API`);
					return callback(error);
				}
				else {
					let res = JSON.parse(response.body)
					this.token = res.data.token;
					utils.writeLog(`API TOKEN: ${this.token}`)
					return callback();
				}
			}
		);
	}

}

module.exports = Simulator;