package com.walker.file.ftp;

import com.walker.file.AbstractFileOperateEngine;
import com.walker.file.DefaultFileInfo;
import com.walker.file.FileInfo;
import com.walker.file.FileOperateException;
import com.walker.file.FileStoreType;
import com.walker.infrastructure.utils.FileUtils;
import com.walker.infrastructure.utils.StringUtils;

import java.io.InputStream;

/**
 * 基于FTP文件管理的引擎实现。
 * @author 时克英
 * @date 2023-02-10
 */
public abstract class FtpFileOperateEngine extends AbstractFileOperateEngine {

    @Override
    public FileStoreType getFileStoreType(){
        return FileStoreType.Ftp;
    }

    @Override
    protected FileInfo acquireFileInfo(String fileName) {
        return new DefaultFileInfo();
    }

    @Override
    public void close() {
        super.close();
//        if(this.ftpConnector != null){
//            this.ftpConnector.logout();
//        }
    }

    @Override
    protected void executeUpload(InputStream inputStream, FileInfo fileInfo) throws FileOperateException {
        FtpConnector ftpConnector = new FtpConnector(this.ftpConfig);
        try {
            ftpConnector.connect();
        } catch (Exception e) {
            throw new FileOperateException("Ftp无法连接，上传未执行，fileInfo = " + fileInfo.getFileName(), e);
        }

//        if(!this.ftpConnector.isConnected()){
//            logger.warn("ftpConnector 当前未连接，尝试重新连接...");
//            try {
//                this.ftpConnector.connect();
//            } catch (Exception e) {
//                throw new FileOperateException("ftpConnector 无法连接，上传失败", e);
//            }
//        }

        // 服务端或远程存放目录，由程序自动生成
        String directory = this.generateSaveFolder(true);

        StringBuilder url = new StringBuilder(directory);
        url.append(this.getFileName(fileInfo));
        ((DefaultFileInfo)fileInfo).setUrl(url.toString());

        logger.debug("上传文件生成目录: " + directory);
        try{
            ftpConnector.upload(directory, fileInfo.getFileName(), inputStream);
        } catch (FtpUploadException ex){
            throw ex;
        } finally {
            if(ftpConnector != null){
                ftpConnector.logout();
            }
        }
    }

    @Override
    protected byte[] executeDownload(FileInfo fileInfo) throws FileOperateException{
        if(StringUtils.isEmpty(fileInfo.getUrl())){
            throw new FileOperateException("文件url不存在，fileId=" + fileInfo.getId(), null);
        }
        String url = fileInfo.getUrl();
        String directory = FileUtils.getFilePathWithoutName(url);

        FtpConnector ftpConnector = new FtpConnector(this.ftpConfig);
        try {
            ftpConnector.connect();
        } catch (Exception e) {
            throw new FileOperateException("Ftp无法连接，下载失败，fileInfo = " + fileInfo.getFileName(), e);
        }

        try{
            return ftpConnector.download(directory, this.getFileName(fileInfo));
        } catch (FtpUploadException ex){
            throw new FileOperateException("ftp下载文件错误:" + ex.getMessage(), ex);
        }
    }

    /**
     * 设置ftp信息，并初始化ftp连接器。
     * @param ftpConfig
     * @throws Exception
     */
    public void setFtpConfig(FtpConfig ftpConfig){
        if(ftpConfig == null){
            throw new IllegalArgumentException("FtpConfig 必须设置!");
        }
        this.ftpConfig = ftpConfig;
    }

    private FtpConfig ftpConfig = null;
}