/**
 * The contents of this file are subject to the OpenMRS Public License
 * Version 1.0 (the "License"); you may not use this file except in
 * compliance with the License. You may obtain a copy of the License at
 * http://license.openmrs.org
 *
 * Software distributed under the License is distributed on an "AS IS"
 * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
 * License for the specific language governing rights and limitations
 * under the License.
 *
 * Copyright (C) OpenMRS, LLC.  All Rights Reserved.
 */
package org.openmrs.web.controller.maintenance;

import java.util.ArrayList;
import java.util.List;

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

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.log4j.Appender;
import org.apache.log4j.Logger;
import org.openmrs.util.MemoryAppender;
import org.springframework.validation.BindException;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.mvc.SimpleFormController;
import org.springframework.web.servlet.view.RedirectView;

/**
 * Get the log lines from the MEMORY_APPENDER appender of log4j as a String list and give it to the
 * view.
 * 
 * @see org.openmrs.util.MemoryAppender
 */
public class ServerLogController extends SimpleFormController {
	
	protected final Log log = LogFactory.getLog(getClass());
	
	/**
	 * The onSubmit function receives the form/command object that was modified by the input form
	 * and saves it to the db
	 * 
	 * @see org.springframework.web.servlet.mvc.SimpleFormController#onSubmit(javax.servlet.http.HttpServletRequest,
	 *      javax.servlet.http.HttpServletResponse, java.lang.Object,
	 *      org.springframework.validation.BindException)
	 */
	protected ModelAndView onSubmit(HttpServletRequest request, HttpServletResponse response, Object obj,
	        BindException errors) throws Exception {
		return new ModelAndView(new RedirectView(getSuccessView()));
	}
	
	/**
	 * This is called prior to displaying a form for the first time. It tells Spring the
	 * form/command object to load into the request
	 * 
	 * @see org.springframework.web.servlet.mvc.AbstractFormController#formBackingObject(javax.servlet.http.HttpServletRequest)
	 */
	protected List<String> formBackingObject(HttpServletRequest request) throws ServletException {
		Appender appender = Logger.getRootLogger().getAppender("MEMORY_APPENDER");
		if (appender instanceof MemoryAppender) {
			MemoryAppender memoryAppender = (MemoryAppender) appender;
			return memoryAppender.getLogLines();
			
		} else {
			return new ArrayList<String>();
		}
	}
}