package com.moral.controller;

import org.apache.commons.net.ftp.FTPClient;
import org.springframework.web.bind.annotation.*;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;

@RestController
@RequestMapping("upgrade")
@CrossOrigin(origins = "*", maxAge = 3600)
public class UpgradeController {

    private FTPClient ftpClient;
    private String fileName = "Version.xml";
    private String ip = "121.40.92.176";
    private String userName = "ftp_user";
    private String userPwd = "qwer1234";
    private int port = 21;
    private String path = "/";

    @RequestMapping(value = "/index", method = RequestMethod.GET)
    public String index() throws IOException {
        ftpClient = new FTPClient();
        try {
            ftpClient.connect(ip, port);
            ftpClient.login(userName, userPwd);
            if (path != null && path.length() > 0) {
                ftpClient.changeWorkingDirectory(path);
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            ftpClient.logout();
            ftpClient.disconnect();
        }
        return readFile();
    }

    public String readFile() {
        InputStream ins = null;
        StringBuilder builder = null;
        try {
            ins = ftpClient.retrieveFileStream(fileName);
            BufferedReader reader = new BufferedReader(new InputStreamReader(ins, "UTF-8"));
            String line;
            builder = new StringBuilder(150);
            while ((line = reader.readLine()) != null) {
                builder.append(line);
            }
            reader.close();
            if (ins != null) {
                ins.close();
            }
            ftpClient.getReply();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return builder.toString();
    }
}