<?php
/**
 * Copyright 2012-2026 ShopeX (https://www.shopex.cn)
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
/**
 * 数据文件生成ftp类
 *
 * @author kamisama.xia@gmail.com
 * @version 0.1
 */
class taskmgr_storage_ftp extends taskmgr_storage_abstract implements taskmgr_storage_interface
{

    private static $_storageConn = null;

    /**
     * __construct
     * @return mixed 返回值
     */

    public function __construct()
    {
        $this->connect();
    }

    /**
     * connect
     * @return mixed 返回值
     */
    public function connect()
    {
        if (!isset(self::$_storageConn)) {
            if (isset($GLOBALS['__STORAGE_CONFIG'])) {

                $config = $GLOBALS['__STORAGE_CONFIG'];

                self::$_storageConn = ftp_connect($config['HOST'], $config['PORT'], $config['TIMEOUT']);
                if (!self::$_storageConn) {
                    trigger_error('connect ftp failed, please check it', E_USER_ERROR);
                }

                $login_result = ftp_login(self::$_storageConn, $config['USER'], $config['PASSWD']);
                if (!$login_result) {
                    trigger_error('login ftp failed, please check it', E_USER_ERROR);
                }

                if ($config['PASV'] == true) {
                    ftp_pasv(self::$_storageConn, true);
                }

                return true;
            } else {
                trigger_error('can\'t load __STORAGE_CONFIG, please check it', E_USER_ERROR);
            }
        }
    }

    /**
     * 向远程ftp上传保存生成文件
     * 
     * @param string $source_file 源文件含路径
     * @param string $task_id 目标文件名命名传入参数
     * @param string $url 生成目标文件路径
     * @return boolean true/false
     */
    public function save($source_file, $task_id, &$url)
    {
        //存储的目的地文件路径
        $destination_file = $this->_get_ident($task_id);

        //传输上传文件
        $upload_result = ftp_put(self::$_storageConn, $destination_file, $source_file, FTP_BINARY);

        //ftp链接退出
        // ftp_close(self::$_storageConn);
        //unset(self::$_storageConn);

        //上传结果
        if (!$upload_result) {
            return false;
        } else {
            $url = $destination_file;
            return true;
        }
    }

    /**
     * 向远程ftp下载文件到本地
     * 
     * @param string $url 远程源文件
     * @param string $local_file 本地目标文件
     * @return boolean true/false
     */
    public function get($url, $local_file)
    {
        $download_result = ftp_get(self::$_storageConn, $local_file, $url, FTP_BINARY);

        //ftp链接退出
        // ftp_close(self::$_storageConn);
        //unset(self::$_storageConn);

        if (!$download_result) {
            return false;
        } else {
            return true;
        }
    }

    /**
     * 向远程ftp删除指定文件
     * 
     * @param string $url 远程源文件
     */
    public function delete($url)
    {
        $del_result = ftp_delete(self::$_storageConn, $url);

        //ftp链接退出
        // ftp_close(self::$_storageConn);

        if (!$del_result) {
            return false;
        } else {
            return true;
        }
    }

    //含完整路径的生成文件地址
    public function _get_ident($key)
    {
        $need_mkdir = true;
        $folder     = date('Ymd');

        //判断ftp中是否包含指定日期的文件夹，有就不需要新建
        $directories = ftp_nlist(self::$_storageConn, '/');
        if ($directories) {
            foreach ($directories as $k => $direct) {
                if (strpos($direct, $folder) !== false) {
                    $need_mkdir = false;
                    break;
                }
            }
        } else {
            $need_mkdir = true;
        }

        //新建日期文件夹，创建失败指定当前文件夹位置为unknown
        if ($need_mkdir) {
            $mkdir_res = ftp_mkdir(self::$_storageConn, $folder);
            if (!$mkdir_res) {
                $folder = 'unknown';
            }
        }

        $path = $this->_ident($key);
        $url  = $folder . '/' . $path;
        return $url;
    }

    /**
     * __destruct
     * @return mixed 返回值
     */
    public function __destruct()
    {
        ftp_close(self::$_storageConn);
    }
}