/**
 * TNTConcept Easy Enterprise Management by Autentia Real Bussiness Solution S.L.
 * Copyright (C) 2007 Autentia Real Bussiness Solution S.L.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License.
 *
 * 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.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

package com.autentia.tnt.bean.error;

import java.io.PrintWriter;
import java.io.StringWriter;
import java.util.Map;

import javax.faces.context.FacesContext;
import javax.servlet.ServletException;

import com.autentia.tnt.bean.BaseBean;
import com.autentia.tnt.util.ConfigurationUtil;
import com.autentia.tnt.util.FacesUtils;

/**
 * UI bean for manage errors
 * @author Autentia
 */
public class ErrorBean extends BaseBean {

	/** Serial version UID */
	private static final long serialVersionUID = -4430250071117226889L;
	
	/** The url paths to images*/
	private final String URL_LOGO_ENABLED = "/img/showLogsEnabled.gif";
	private final String URL_LOGO_DISABLED = "/img/showLogsDisabled.gif";
    
	/** Current image*/
	private String urlLogo;
	
	/** Current image title*/
	private String title;
	
	/** Variable que se recoge del autentia.properties para mostrar las trazas de 
	 * las excepciones en la página error.jsp*/
	private boolean showLogs = ConfigurationUtil.getDefault().getShowLogs();
	
	/**
	 * Constructor
	 */
	public ErrorBean() {
		if (showLogs) {
			urlLogo = URL_LOGO_ENABLED;
		} else {
			urlLogo = URL_LOGO_DISABLED;
		}
	}
	
	/**
	 * Get the logs to exception produced
	 * @return the logs
	 */
	public String getStackTrace() {
        FacesContext context = FacesContext.getCurrentInstance();
        Map requestMap = context.getExternalContext().getRequestMap();
        Throwable ex = (Throwable) requestMap.get("javax.servlet.error.exception");
        StringWriter writer = new StringWriter();
        PrintWriter pw = new PrintWriter(writer);
        fillStackTrace(ex, pw);

        return writer.toString();
    }
	
	/**
	 * Print the logs
	 * @param ex
	 * @param pw
	 */
	private void fillStackTrace(Throwable ex, PrintWriter pw) {
        if (null == ex) {
            return;
        }

        if (ex instanceof ServletException) {
            Throwable cause = ((ServletException) ex).getRootCause();

            if (null != cause) {
                pw.println("Root Cause:");
                fillStackTrace(cause, pw);
            }
        } else {
            Throwable cause = ex.getCause();

            if (null != cause) {
                pw.println("Cause:");
                fillStackTrace(cause, pw);
            }
        }
    }

	/**
	 * Change the state to showLogs var
	 */
	public void changeLogMode() {
		setShowLogs(!showLogs);
		
		FacesUtils.renderResponse();
	}
	
	/**
	 * @return the showLogs
	 */
	public boolean isShowLogs() {
		return showLogs;
	}

	/**
	 * @param showLogs the showLogs to set
	 */
	public void setShowLogs(boolean showLogs) {
		this.showLogs = showLogs;
	}

	/**
	 * @return the urlLogo
	 */
	public String getUrlLogo() {
		if (showLogs) {
			urlLogo = URL_LOGO_ENABLED;
			title = FacesUtils.getMessage("error.enabledLogs");
		} else {
			urlLogo = URL_LOGO_DISABLED;
			title = FacesUtils.getMessage("error.disabledLogs");
		}
		return urlLogo;
	}

	/**
	 * @return the title
	 */
	public String getTitle() {
		return title;
	}
}