package com.lijy.util;

import com.jcraft.jsch.Channel;
import com.jcraft.jsch.ChannelSftp;
import com.jcraft.jsch.JSch;
import com.jcraft.jsch.JSchException;
import com.jcraft.jsch.Session;
import com.jcraft.jsch.SftpException;
import org.apache.log4j.Logger;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Properties;

public class FtpUtil {
    /**log*/
    protected static Logger log = Logger.getLogger(FtpUtil.class);

    public static final String NO_FILE = "No such file";

    private ChannelSftp sftp = null;

    private Session sshSession = null;

    private String username;

    private String password;

    private String host;

    private int port;

    public FtpUtil(String username, String password, String host, int port) {
        this.username = username;
        this.password = password;
        this.host = host;
        this.port = port;
    }

    /**
     * 連線sftp伺服器
     * @return ChannelSftp sftp型別
     * @throws GoPayException
     */
    public ChannelSftp connect() throws GoPayException {
        log.info("FtpUtil-->connect--ftp連線開始>>>>>>host=" + host + ">>>port" + port + ">>>username=" + username);
        JSch jsch = new JSch();
        try {
            jsch.getSession(username, host, port);
            sshSession = jsch.getSession(username, host, port);
            log.info("ftp---Session created.");
            sshSession.setPassword(password);
            Properties properties = new Properties();
            properties.put("StrictHostKeyChecking", "no");
            sshSession.setConfig(properties);
            sshSession.connect();
            log.info("ftp---Session connected.");
            Channel channel = sshSession.openChannel("sftp");
            channel.connect();
            log.info("Opening Channel.");
            sftp = (ChannelSftp) channel;
            log.info("ftp---Connected to " + host);
        }
        catch (JSchException e) {
            throw new GoPayException("FtpUtil-->connect異常" + e.getMessage());
        }
        return sftp;
    }

    /**
     * 載單個檔案
     * @param directory       ：遠端下載目錄(以路徑符號結束)
     * @param remoteFileName  FTP伺服器檔名稱 如：xxx.txt ||xxx.txt.zip
     * @param localFile       本地檔案路徑 如 D:\\xxx.txt
     * @return
     * @throws GoPayException
     */
    public File downloadFile(String directory, String remoteFileName,String localFile) throws GoPayException {
        log.info(">>>>>>>>FtpUtil-->downloadFile--ftp下載檔案"+remoteFileName+"開始>>>>>>>>>>>>>");
        connect();
        File file = null;
        OutputStream output = null;
        try {
            file = new File(localFile);
            if (file.exists()){
                file.delete();
            }
            file.createNewFile();
            sftp.cd(directory);
            output = new FileOutputStream(file);
            sftp.get(remoteFileName, output);
            log.info("===DownloadFile:" + remoteFileName + " success from sftp.");
        }
        catch (SftpException e) {
            if (e.toString().equals(NO_FILE)) {
                log.info(">>>>>>>>FtpUtil-->downloadFile--ftp下載檔案失敗" + directory +remoteFileName+ "不存在>>>>>>>>>>>>>");
                throw new GoPayException("FtpUtil-->downloadFile--ftp下載檔案失敗" + directory +remoteFileName + "不存在");
            }
            throw new GoPayException("ftp目錄或者檔案異常，檢查ftp目錄和檔案" + e.toString());
        }
        catch (FileNotFoundException e) {
            throw new GoPayException("本地目錄異常，請檢查" + file.getPath() + e.getMessage());
        }
        catch (IOException e) {
            throw new GoPayException("建立本地檔案失敗" + file.getPath() + e.getMessage());
        }
        finally {
            if (output != null) {
                try {
                    output.close();
                }
                catch (IOException e) {
                    throw new GoPayException("Close stream error."+ e.getMessage());
                }
            }
            disconnect();
        }

        log.info(">>>>>>>>FtpUtil-->downloadFile--ftp下載檔案結束>>>>>>>>>>>>>");
        return file;
    }

    /**
     * 上傳單個檔案
     * @param directory      ：遠端下載目錄(以路徑符號結束)
     * @param uploadFilePath 要上傳的檔案 如：D:\\test\\xxx.txt
     * @param fileName       FTP伺服器檔名稱 如：xxx.txt ||xxx.txt.zip
     * @throws GoPayException
     */
    public void uploadFile(String directory, String uploadFilePath, String fileName)
            throws GoPayException {
        log.info(">>>>>>>>FtpUtil-->uploadFile--ftp上傳檔案開始>>>>>>>>>>>>>");
        FileInputStream in = null;
        connect();
        try {
            sftp.cd(directory);
        }
        catch (SftpException e) {
            try {
                sftp.mkdir(directory);
                sftp.cd(directory);
            }
            catch (SftpException e1) {
                throw new GoPayException("ftp建立檔案路徑失敗，路徑為" + directory);
            }

        }
        File file = new File(uploadFilePath);
        try {
            in = new FileInputStream(file);
            sftp.put(in, fileName);
        }
        catch (FileNotFoundException e) {
            throw new GoPayException("檔案不存在-->" + uploadFilePath);
        }
        catch (SftpException e) {
            throw new GoPayException("sftp異常-->" + e.getMessage());
        }
        finally {
            if (in != null){
                try {
                    in.close();
                }
                catch (IOException e) {
                    throw new GoPayException("Close stream error."+ e.getMessage());
                }
            }
            disconnect();
        }
        log.info(">>>>>>>>FtpUtil-->uploadFile--ftp上傳檔案結束>>>>>>>>>>>>>");
    }

    private synchronized static File certTempEmptyile() {
        String dirPath = SystemConfig.getProperty("down_settle_file.temp_path");
        FileUtil.mkDir(dirPath);
        String newFileName = System.currentTimeMillis() + ".txt";
        String filePath = dirPath + File.separator + newFileName;
        File file = new File(filePath);
        return file;
    }

    /**
     * 關閉連線
     */
    public void disconnect() {
        if (this.sftp != null) {
            if (this.sftp.isConnected()) {
                this.sftp.disconnect();
                this.sftp = null;
                log.info("sftp is closed already");
            }
        }
        if (this.sshSession != null) {
            if (this.sshSession.isConnected()) {
                this.sshSession.disconnect();
                this.sshSession = null;
                log.info("sshSession is closed already");
            }
        }
    }




}