import Bean from '../decorators/Bean'
import http from 'http';
import url from 'url';

export enum PING_RESULT_TYPE {

    ERROR,
    SUCCEEDS = 1
}

export interface PING_RESULT {
    result: PING_RESULT_TYPE,
    e?: any
}

export class HttpRestConnection {

    constructor() {
    }

    public ping = (_url: string): Promise<PING_RESULT> => {

        //RequestOptions | string | URL
        let urlObj;
        try {
            urlObj = url.parse(_url);
        } catch (err) {
            return Promise.reject({result: PING_RESULT_TYPE.ERROR, e: new Error(" url parse failed ")});
        }

        let options = {
            hostname: urlObj.hostname,
            port: urlObj.port,
            timeout: 1000,
            method: 'POST',
        }

        return new Promise((resolve, reject) => {
            try {
                let req = http.request(options, function (res) {
                    let serverData = '';

                    // console.log(res.statusCode)
                    resolve({result:PING_RESULT_TYPE.SUCCEEDS})
                    // 404 같은건 여기로 에러가 떨어진다

                    // stream 형
                    // res.on('data', function (chunk) {
                    // 	// console.log("=========================== http data")
                    // 	// console.log(chunk)
                    // 	serverData += chunk;
                    // });
                    // res.on('end', function (res:any) {
                    // 	// console.log("=========================== http end")
                    // 	// // console.log(res);
                    // 	// resolve({result:PING_RESULT_TYPE.SUCCEEDS})
                    // });
                })
                    .on('error', function (e) {
                        // console.log("=========================== http error")
                        // on(event: 'error', listener: (err: Error) => void): this;

                        reject({result: PING_RESULT_TYPE.ERROR, e: e})

                    })
                    .on('timeout', () => {
                        // console.log("=========================== http timeout")
                        req.abort();
                        reject({result: PING_RESULT_TYPE.ERROR, e: "timeout"})
                    }).end();
            } catch (e) {
                reject({result: PING_RESULT_TYPE.ERROR, e: e})
            }
        })
    }
}