/*
    * Copyright 2010-2013 Capgemini 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.
   */
  package net.sf.appstatus.web.pages;
  
  import static net.sf.appstatus.web.HtmlUtils.applyLayout;
  import static net.sf.appstatus.web.HtmlUtils.generateBeginTable;
  import static net.sf.appstatus.web.HtmlUtils.generateEndTable;
  import static net.sf.appstatus.web.HtmlUtils.generateHeaders;
  import static net.sf.appstatus.web.HtmlUtils.generateRow;
  import static org.apache.commons.lang3.StringUtils.isNotBlank;
  
  import java.io.IOException;
  import java.io.UnsupportedEncodingException;
  import java.util.HashMap;
  import java.util.List;
  import java.util.Map;
  
  import javax.servlet.ServletOutputStream;
  import javax.servlet.http.HttpServletRequest;
  import javax.servlet.http.HttpServletResponse;
  
  import org.apache.commons.lang3.text.StrBuilder;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import net.sf.appstatus.core.loggers.ILoggersManager;
  import net.sf.appstatus.core.loggers.LoggerConfig;
  import net.sf.appstatus.web.StatusWebHandler;
  
  /**
   * Display loggers current level and let the user change them.
   *
   * @author Romain Gonord
   *
   */
  public class LoggersPage extends AbstractPage {
  	private static final String ENCODING = "UTF-8";
  	private static final String LEVEL_ERROR = "ERROR";
  	private static final String LEVEL_INFO = "INFO";
  	private static final String LEVEL_TRACE = "TRACE";
  	private static final String LEVEL_WARN = "WARN";
  	private static final Logger LOGGER = LoggerFactory.getLogger(LoggersPage.class);
  	private static final String PAGECONTENTLAYOUT = "logContentLayout.html";
  
  	@Override
  	public void doGet(StatusWebHandler webHandler, HttpServletRequest req, HttpServletResponse resp)
  			throws UnsupportedEncodingException, IOException {
  		LOGGER.debug("doGet");
  		if (isNotBlank(req.getParameter("name")) && isNotBlank(req.getParameter("level"))) {
  			LoggerConfig logger2Change = new LoggerConfig(req.getParameter("name"), req.getParameter("level"));
  			LOGGER.debug("Change log level : {} - {}", logger2Change.getName(), logger2Change.getLevel());
  			webHandler.getAppStatus().getLoggersManager().update(logger2Change);
  		}
  		setup(resp, "text/html");
  		ServletOutputStream os = resp.getOutputStream();
  		Map<String, String> valuesMap = new HashMap<String, String>();
  		// build sbLoggersTable
  		StrBuilder sbLoggersTable = new StrBuilder();
  		List<LoggerConfig> loggers = webHandler.getAppStatus().getLoggersManager().getLoggers();
  		if (generateBeginTable(sbLoggersTable, loggers.size())) {
  			generateHeaders(sbLoggersTable, "", "Name", "Levels", "", "", "", "");
  			for (LoggerConfig logger : loggers) {
  				generateRow(sbLoggersTable, Resources.STATUS_PROP, logger.getName(), getButton(LEVEL_TRACE, logger),
  						getButton(ILoggersManager.LEVEL_DEBUG, logger), getButton(LEVEL_INFO, logger),
  						getButton(LEVEL_WARN, logger), getButton(LEVEL_ERROR, logger));
  			}
  			generateEndTable(sbLoggersTable, loggers.size());
  		}
  		// generating content
  		valuesMap.put("loggersTable", sbLoggersTable.toString());
  		valuesMap.put("loggerCount", String.valueOf(loggers.size()));
  		String content = applyLayout(valuesMap, PAGECONTENTLAYOUT);
  		valuesMap.clear();
  		valuesMap.put("content", content);
  		// generating page
  		os.write(getPage(webHandler, valuesMap).getBytes(ENCODING));
  	}
  
  	@Override
  	public void doPost(StatusWebHandler webHandler, HttpServletRequest req, HttpServletResponse resp) {
  		// nothing to do
  	}
  
  	private String getButton(String level, LoggerConfig logger) {
  		String buttonTypeTmp = "";
  		if (level.equals(logger.getLevel())) {
  			if (LEVEL_TRACE.equals(level)) {
  				buttonTypeTmp = "btn-info";
 			} else if (ILoggersManager.LEVEL_DEBUG.equals(level)) {
 				buttonTypeTmp = "btn-primary";
 			} else if (LEVEL_INFO.equals(level)) {
 				buttonTypeTmp = "btn-success";
 			} else if (LEVEL_WARN.equals(level)) {
 				buttonTypeTmp = "btn-warning";
 			} else if (LEVEL_ERROR.equals(level)) {
 				buttonTypeTmp = "btn-danger";
 			}
 		}
 		return "<a class='btn btn-mini " + buttonTypeTmp + "' href='?p=loggers&level=" + level + "&name="
 				+ logger.getName() + "'>" + level + "</a>";
 	}
 
 	@Override
 	public String getId() {
 		return "loggers";
 	}
 
 	@Override
 	public String getName() {
 		return "Loggers";
 	}
 }