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/*
 * Copyright (c) 2009, 2020 Oracle and/or its affiliates. All rights reserved.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v. 2.0, which is available at
 * http://www.eclipse.org/legal/epl-2.0.
 *
 * This Source Code may also be made available under the following Secondary
 * Licenses when the conditions for such availability set forth in the
 * Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
 * version 2 with the GNU Classpath Exception, which is available at
 * https://www.gnu.org/software/classpath/license.html.
 *
 * SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
 */

/*
 * LBConfigContentSource.java
 *
 * Created on December 26, 2006, 11:08 PM
 *
 * To change this template, choose Tools | Template Manager
 * and open the template in the editor.
 */

package org.glassfish.admingui.common.servlet;

import jakarta.servlet.http.HttpServletRequest;

import java.io.File;
import java.io.FileInputStream;
import java.io.InputStream;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;

import org.glassfish.admingui.common.util.RestUtil;

/**
 *
 * @author anilam
 */
public class LBConfigContentSource  implements DownloadServlet.ContentSource {

     /**
     *  This method returns a unique string used to identify this
     *     {@link DownloadServlet#ContentSource}.  This string must be
     *     specified in order to select the appropriate
     *     {@link DownloadServlet#ContentSource} when using the
     *     {@link DownloadServlet}.
     */
    public String getId() {
        return "LBConfig";                                        // NOI18N
    }

    /**
     *   This method is responsible for generating the content and
     *     returning an InputStream to that content.  It is also
     *     responsible for setting any attribute values in the
     *     {@link DownloadServlet#Context}, such as {@link DownloadServlet#EXTENSION} or
     *     {@link DownloadServlet#CONTENT_TYPE}.
     */
    public InputStream getInputStream(DownloadServlet.Context ctx) {
        // Set the extension so it can be mapped to a MIME type
        ctx.setAttribute(DownloadServlet.EXTENSION, "xml");

        // Get appName
        HttpServletRequest request = (HttpServletRequest) ctx.getServletRequest();
        String lbName = request.getParameter("lbName");
        String restUrl = request.getParameter("restUrl");

        // Create the tmpFile
        InputStream tmpFile = null;
        try {
            String endpoint = restUrl + "/load-balancers/load-balancer/" + lbName + "/export-http-lb-config";
            DateFormat dateFormat = new SimpleDateFormat("yyyyMMddHHmmss");
            Date date = new Date();
            Map attrsMap = new HashMap();
            String tempDir = System.getProperty("java.io.tmpdir");
            String lbFileName = "loadbalancer.xml." + lbName + "_LB_CONFIG." + dateFormat.format(date);
            String slbFile = tempDir + System.getProperty("file.separator") + lbFileName;
            File lbFile = new File(slbFile);
            attrsMap.put("id", slbFile);
            RestUtil.postRestRequestFromServlet(request, endpoint, attrsMap, true, true);
            tmpFile = new FileInputStream(lbFile);
            boolean success = lbFile.delete();
            if (!success) {
                throw new Exception("Load Balancer config file delete failed");
            }
        } catch (Exception ex) {
            throw new RuntimeException(ex);
        }

        // Save some important stuff for cleanUp
        ctx.setAttribute("tmpFile", tmpFile);                        // NOI18N

        // Return an InputStream to the tmpFile
        return tmpFile;
    }

    /**
     *  This method may be used to clean up any temporary resources.  It
     *     will be invoked after the InputStream has been
     *     completely read.
     */
    public void cleanUp(DownloadServlet.Context ctx) {
        // Get the File information
        InputStream tmpFile =
            (InputStream) ctx.getAttribute("tmpFile");                // NOI18N

        // Close the InputStream
        if (tmpFile != null) {
            try {
                tmpFile.close();
            } catch (Exception ex) {
                // Ignore...
            }
        }

        ctx.removeAttribute("tmpFile");                        // NOI18N
    }

    /**
     *  This method is responsible for returning the last modified date of
     *     the content, or -1 if not applicable.  This information will be
     *     used for caching.  This implementation always returns -1.
     *
     * @return        -1
     */
    public long getLastModified(DownloadServlet.Context context) {
        return -1;
    }
}