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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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 org.apache.log4j;

import org.apache.log4j.spi.LoggingEvent;
import org.apache.log4j.spi.LocationInfo;
import org.apache.log4j.helpers.Transform;

/**
 * This layout outputs events in a HTML table.
 *
 * Appenders using this layout should have their encoding set to UTF-8 or
 * UTF-16, otherwise events containing non ASCII characters could result in
 * corrupted log files.
 *
 * @author Ceki Gülcü
 */
public class HTMLLayout extends Layout {

    protected final int BUF_SIZE = 256;
    protected final int MAX_CAPACITY = 1024;

    static String TRACE_PREFIX = "
    ";

    // output buffer appended to when format() is invoked
    private StringBuffer sbuf = new StringBuffer(BUF_SIZE);

    /**
     * A string constant used in naming the option for setting the the location
     * information flag. Current value of this string constant is
     * LocationInfo.
     * 
     * 
     * Note that all option keys are case sensitive.
     * 
     * @deprecated Options are now handled using the JavaBeans paradigm. This
     *             constant is not longer needed and will be removed in the
     *             near term.
     * 
     */
    public static final String LOCATION_INFO_OPTION = "LocationInfo";

    /**
     * A string constant used in naming the option for setting the the HTML document
     * title. Current value of this string constant is Title.
     */
    public static final String TITLE_OPTION = "Title";

    // Print no location info by default
    boolean locationInfo = false;

    String title = "Log4J Log Messages";

    /**
     * The LocationInfo option takes a boolean value. By default, it is set
     * to false which means there will be no location information output by this
     * layout. If the the option is set to true, then the file name and line number
     * of the statement at the origin of the log statement will be output.
     * 
     * 

     * If you are embedding this layout within an
     * {@link org.apache.log4j.net.SMTPAppender} then make sure to set the
     * LocationInfo option of that appender as well.
     */
    public void setLocationInfo(boolean flag) {
	locationInfo = flag;
    }

    /**
     * Returns the current value of the LocationInfo option.
     */
    public boolean getLocationInfo() {
	return locationInfo;
    }

    /**
     * The Title option takes a String value. This option sets the document
     * title of the generated HTML document.
     * 
     * 

     * Defaults to 'Log4J Log Messages'.
     */
    public void setTitle(String title) {
	this.title = title;
    }

    /**
     * Returns the current value of the Title option.
     */
    public String getTitle() {
	return title;
    }

    /**
     * Returns the content type output by this layout, i.e "text/html".
     */
    public String getContentType() {
	return "text/html";
    }

    /**
     * No options to activate.
     */
    public void activateOptions() {
    }

    public String format(LoggingEvent event) {

	if (sbuf.capacity() > MAX_CAPACITY) {
	    sbuf = new StringBuffer(BUF_SIZE);
	} else {
	    sbuf.setLength(0);
	}

	sbuf.append(Layout.LINE_SEP + "" + Layout.LINE_SEP);

	sbuf.append("");
	sbuf.append(event.timeStamp - LoggingEvent.getStartTime());
	sbuf.append("" + Layout.LINE_SEP);

	String escapedThread = Transform.escapeTags(event.getThreadName());
	sbuf.append("");
	sbuf.append(escapedThread);
	sbuf.append("" + Layout.LINE_SEP);

	sbuf.append("");
	if (event.getLevel().equals(Level.DEBUG)) {
	    sbuf.append("");
	    sbuf.append(Transform.escapeTags(String.valueOf(event.getLevel())));
	    sbuf.append("");
	} else if (event.getLevel().isGreaterOrEqual(Level.WARN)) {
	    sbuf.append("");
	    sbuf.append(Transform.escapeTags(String.valueOf(event.getLevel())));
	    sbuf.append("");
	} else {
	    sbuf.append(Transform.escapeTags(String.valueOf(event.getLevel())));
	}
	sbuf.append("" + Layout.LINE_SEP);

	String escapedLogger = Transform.escapeTags(event.getLoggerName());
	sbuf.append("");
	sbuf.append(escapedLogger);
	sbuf.append("" + Layout.LINE_SEP);

	if (locationInfo) {
	    LocationInfo locInfo = event.getLocationInformation();
	    sbuf.append("");
	    sbuf.append(Transform.escapeTags(locInfo.getFileName()));
	    sbuf.append(':');
	    sbuf.append(locInfo.getLineNumber());
	    sbuf.append("" + Layout.LINE_SEP);
	}

	sbuf.append("");
	sbuf.append(Transform.escapeTags(event.getRenderedMessage()));
	sbuf.append("" + Layout.LINE_SEP);
	sbuf.append("" + Layout.LINE_SEP);

	if (event.getNDC() != null) {
	    sbuf.append(
		    "");
	    sbuf.append("NDC: " + Transform.escapeTags(event.getNDC()));
	    sbuf.append("" + Layout.LINE_SEP);
	}

	String[] s = event.getThrowableStrRep();
	if (s != null) {
	    sbuf.append("");
	    appendThrowableAsHTML(s, sbuf);
	    sbuf.append("" + Layout.LINE_SEP);
	}

	return sbuf.toString();
    }

    void appendThrowableAsHTML(String[] s, StringBuffer sbuf) {
	if (s != null) {
	    int len = s.length;
	    if (len == 0)
		return;
	    sbuf.append(Transform.escapeTags(s[0]));
	    sbuf.append(Layout.LINE_SEP);
	    for (int i = 1; i < len; i++) {
		sbuf.append(TRACE_PREFIX);
		sbuf.append(Transform.escapeTags(s[i]));
		sbuf.append(Layout.LINE_SEP);
	    }
	}
    }

    /**
     * Returns appropriate HTML headers.
     */
    public String getHeader() {
	StringBuilder sbuf = new StringBuilder();
	sbuf.append(
		""
			+ Layout.LINE_SEP);
	sbuf.append("" + Layout.LINE_SEP);
	sbuf.append("" + Layout.LINE_SEP);
	sbuf.append("" + title + "" + Layout.LINE_SEP);
	sbuf.append("" + Layout.LINE_SEP);
	sbuf.append("" + Layout.LINE_SEP);
	sbuf.append("" + Layout.LINE_SEP);
	sbuf.append("
" + Layout.LINE_SEP);
	sbuf.append("Log session start time " + new java.util.Date() + "
" + Layout.LINE_SEP);
	sbuf.append("
" + Layout.LINE_SEP);
	sbuf.append(""
		+ Layout.LINE_SEP);
	sbuf.append("" + Layout.LINE_SEP);
	sbuf.append("" + Layout.LINE_SEP);
	sbuf.append("" + Layout.LINE_SEP);
	sbuf.append("" + Layout.LINE_SEP);
	sbuf.append("" + Layout.LINE_SEP);
	if (locationInfo) {
	    sbuf.append("" + Layout.LINE_SEP);
	}
	sbuf.append("" + Layout.LINE_SEP);
	sbuf.append("" + Layout.LINE_SEP);
	return sbuf.toString();
    }

    /**
     * Returns the appropriate HTML footers.
     */
    public String getFooter() {
	StringBuilder sbuf = new StringBuilder();
	sbuf.append("Time Thread Level Category File:Line Message" + Layout.LINE_SEP);
	sbuf.append("
" + Layout.LINE_SEP);
	sbuf.append("");
	return sbuf.toString();
    }

    /**
     * The HTML layout handles the throwable contained in logging events. Hence,
     * this method return false.
     */
    public boolean ignoresThrowable() {
	return false;
    }
}