/**
 * Copyright (C) 2012-2017 52°North Initiative for Geospatial Open Source
 * Software GmbH
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 as published
 * by the Free Software Foundation.
 *
 * If the program is linked with libraries which are licensed under one of
 * the following licenses, the combination of the program with the linked
 * library is not considered a "derivative work" of the program:
 *
 *     - Apache License, version 2.0
 *     - Apache Software License, version 1.0
 *     - GNU Lesser General Public License, version 3
 *     - Mozilla Public License, versions 1.0, 1.1 and 2.0
 *     - Common Development and Distribution License (CDDL), version 1.0
 *
 * Therefore the distribution of the program linked with libraries licensed
 * under the aforementioned licenses, is permitted by the copyright holders
 * if the distribution is compliant with both the GNU General Public
 * License version 2 and the aforementioned licenses.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
 * Public License for more details.
 */
package org.n52.sos.web.admin;

import java.io.IOException;
import java.io.InputStream;

import javax.servlet.http.HttpServletResponse;

import org.apache.commons.io.IOUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.http.MediaType;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;

import org.n52.sos.service.AbstractLoggingConfigurator;
import org.n52.sos.web.ControllerConstants;

/**
 * @since 4.0.0
 *
 */
@Controller
@RequestMapping(value = ControllerConstants.Paths.ADMIN_LOGGING_FILE_DOWNLOAD)
public class AdminLogFileDownloadController {

    private static final Logger LOG = LoggerFactory.getLogger(AdminLogFileDownloadController.class);

    @RequestMapping(method = RequestMethod.GET, produces = MediaType.TEXT_PLAIN_VALUE)
    public void downloadFile(HttpServletResponse response) throws IOException {
        InputStream is = null;
        try {
            is = AbstractLoggingConfigurator.getInstance().getLogFile();
            if (is == null) {
                throw new RuntimeException("Could not read log file.");
            }
            IOUtils.copy(is, response.getOutputStream());
        } finally {
            if (is != null) {
                try {
                    is.close();
                } catch (IOException e) {
                    LOG.error("Can not close InputStream", e);
                }
            }
        }
    }
}