/*
Copyright (C) DocuSign, Inc.  All rights reserved.

This source code is intended only as a supplement to DocuSign SDK and/or on-line documentation.

This sample is designed to demonstrate DocuSign features and is not intended for production use. 
Code and policy for a production application must be developed to meet the specific data and 
security requirements of the application.

THIS CODE AND INFORMATION ARE PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED 
OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES OF MERCHANTABILITY AND/OR 
FITNESS FOR A PARTICULAR PURPOSE.
*/
package net.docusign.insco.controller;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.Enumeration;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.commons.io.FileUtils;
import org.apache.commons.io.IOUtils;
import org.apache.log4j.Appender;
import org.apache.log4j.FileAppender;
import org.apache.log4j.Logger;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;

/**
 * Controller to spit back the contents of the InsuranceCo event log.
 */
@Controller
@RequestMapping("/logDump.html")
public class LogDumpController {
    private final String NOT_FOUND_MESSAGE = "The InsuranceCo event-log file could not be found.  Check the Log4j configuration and make sure the file is writable.";
    private Logger rootLogger = Logger.getRootLogger();
    private String LOG_BODY = "<html><body>%s</body></html>";
    
    /**
     * Dump the InsuranceCo even log current being written to by log4j.
     * 
     * @param request the servlet request
     * @param response the servlet response
     * @throws Exception thrown if there is an i/o error reading/copying the log file
     */
    @SuppressWarnings("unchecked")
    @RequestMapping(method = RequestMethod.GET)
    public void dumpLog(HttpServletRequest request, HttpServletResponse response) throws Exception {
        response.setContentType("text/html");
        
        Enumeration<Appender> appenders = rootLogger.getAllAppenders();
        while(appenders.hasMoreElements()) {
            Appender appender = appenders.nextElement();
            if(appender instanceof FileAppender) {
                writeLogToResponse((FileAppender) appender, response);
                return;
            }
        }
        
        response.sendError(HttpServletResponse.SC_NOT_FOUND, NOT_FOUND_MESSAGE);
    }
    
    /**
     * Writes the log file, obtained from the log4j {@link FileAppender}, to the response for client consumption.
     * 
     * @param fileAppender the log4j file appender
     * @throws IOException thrown if there is an i/o error reading/copying the log file
     * @throws FileNotFoundException thrown if the log file is not found
     */
    protected void writeLogToResponse(FileAppender fileAppender, HttpServletResponse response) throws FileNotFoundException, IOException {
    	String logFile = FileUtils.readFileToString(new File(fileAppender.getFile()));
    	logFile = logFile.replace("\n", "<br/>");
    	
    	IOUtils.write(String.format(LOG_BODY, logFile), response.getWriter());
    }
}