/**
 * 信令认证模块，负责对连接信令的用户进行认证和状态记录
 * 终端---->信令（加载本模块）---->业务系统
 * Created by WJ on 2018-12-06
 * @云视睿博  www.ruiboyun.com
 */

const http = require('http');
const qs   = require('querystring');

class NtvAuthModule {
	
	constructor(config) {
		this.config = config;
	}

	errorMsg(error){
		return {code:5,err_desc:error};
	}

	/**
	 * 解析接口返回内容
	 * 并回调,回调传输人的第二个参数是一个对象，格式同接口返回格式。
	 * @param {*} data 
	 * @param {*} callback 参数为json对象，结构同ntv g3接口规范
	 */
	parseData(data,callback) {
		if(typeof(callback)!="function"){
			console.log("auth module needs callback function");
			return;
		}
		var obj = null;
		try {
			obj  = JSON.parse(data);
			if(!"code" in obj){
				obj.code = 5;
				obj.err_desc = "接口返回数据内容不可理解！";
			}
		} catch(error) {
			obj = this.errorMsg("解析接口返回数据失败！")
		}

		callback(obj);
	}

	/**
	 * 请求远程接口
	 * @param {接口的action} action 
	 * @param {参数} data  参数键值对 对象或字符串
	 * @param {回调} callback 
	 */
	postCall(host,port,path,data,callback) {
		var returnData = '';
		var content    = '';
		if(typeof(data)=="object"){
			content = qs.stringify(data);
		}else{
			content = data;
		}

		var options = {
			hostname: host,
			port: port,
			path: path,
			method: 'POST',
			timeout: 2000,
			headers: {
				'Content-Type': 'application/x-www-form-urlencoded; charset=UTF-8'
			}
		};
		var that = this;
		var req = http.request(options, function(res) {
			res.setEncoding('utf8');
			res.on('data', function(chunk) {
				returnData = returnData + chunk;
			});
			res.on('end', () => {
				that.parseData(returnData,callback);
			});
		});

		req.on('error', function(e) {
			if(typeof(callback)=="function"){
				that.callback(that.errorMsg(5,'无法连接业务服务器！'));
			}
		});

		req.write(content);
		req.end();
	}

	auth(usrId,callback){
		var config = this.config;
		var path = "/api/sipMgr/";
		var paras= "action=sip_auth&id=" + usrId;
		var host = config.host;
		var port = config.port;
		this.postCall(host,port,path,paras,callback);
	}

	/**
	 * 
	 * @param {*} usrId 
	 * @param {*} status  1 = online
	 * @param {string} channels  id=name|id=name
	 * @param {*} callback 
	 */
	status(usrId,status,channels,callback){
		var config = this.config;
		var path = "/api/sipMgr/";
		var paras= "action=sip_status&id=" + usrId +"&status=" + status + "&chn=" + encodeURIComponent(channels);
		var host = config.host;
		var port = config.port;
		this.postCall(host,port,path,paras,callback);
	}

	/**
	 * 
	 * @param {*} usrId 
	 * @param {*} status  1 = online
	 * @param {*} callback 
	 */
	play_status(usrId,status,callback){
		var config = this.config;
		var path = "/api/sipMgr/";
		var paras= "action=play_status&id=" + usrId +"&status=" + status;
		var host = config.host;
		var port = config.port;
		this.postCall(host,port,path,paras,callback);
	}
}

module.exports = NtvAuthModule;