/*
      Copyright (C) 2002-2004 MySQL AB

      This program is free software; you can redistribute it and/or modify
      it under the terms of version 2 of the GNU General Public License as 
      published by the Free Software Foundation.

      There are special exceptions to the terms and conditions of the GPL 
      as it is applied to this software. View the full text of the 
      exception in file EXCEPTIONS-CONNECTOR-J in the directory of this 
      software distribution.

      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, write to the Free Software
      Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA



 */
package com.mysql.jdbc.log;

import com.mysql.jdbc.Util;
import com.mysql.jdbc.profiler.ProfilerEvent;

import java.util.Date;

/**
 * Provides logging facilities for those platforms that
 * don't have built-in facilities. Simply logs messages
 * to STDERR.
 * 
 * @author Mark Matthews
 * 
 * @version $Id: StandardLogger.java,v 1.1.2.5 2004/09/22 12:17:58 mmatthew Exp $
 */
public class StandardLogger implements Log {
    private static final int FATAL = 0;
    private static final int ERROR = 1;
    private static final int WARN = 2;
    private static final int INFO = 3;
    private static final int DEBUG = 4;
    private static final int TRACE = 5;
    private static final String LINE_SEPARATOR = System.getProperty(
            "line.separator");
    private static final int LINE_SEPARATOR_LENGTH = LINE_SEPARATOR.length();
    public static StringBuffer bufferedLog = null;
    
    /**
     * Creates a new StandardLogger object.
     *
     * @param name the name of the configuration to
     * use -- ignored
     */
    public StandardLogger(String name) {
    }

    public static void saveLogsToBuffer() {
    	if (bufferedLog == null) {
    		bufferedLog = new StringBuffer();
    	}
    }
    
	/**
	 * @see com.mysql.jdbc.log.Log#isDebugEnabled()
	 */
	public boolean isDebugEnabled() {
		return true;
	}

	/**
	 * @see com.mysql.jdbc.log.Log#isErrorEnabled()
	 */
	public boolean isErrorEnabled() {
		return true;
	}

	/**
	 * @see com.mysql.jdbc.log.Log#isFatalEnabled()
	 */
	public boolean isFatalEnabled() {
		return true;
	}

	/**
	 * @see com.mysql.jdbc.log.Log#isInfoEnabled()
	 */
	public boolean isInfoEnabled() {
		return true;
	}

	/**
	 * @see com.mysql.jdbc.log.Log#isTraceEnabled()
	 */
	public boolean isTraceEnabled() {
		return true;
	}

	/**
	 * @see com.mysql.jdbc.log.Log#isWarnEnabled()
	 */
	public boolean isWarnEnabled() {
		return true;
	}

	/**
	 * Logs the given message instance using the 
	 * 'debug' level
	 * 
	 * @param message the message to log
	 */
	public void logDebug(Object message) {
		logInternal(DEBUG, message, null);
	}

	/**
	 * Logs the given message and Throwable at
	 * the 'debug' level.
	 * 
	 * @param message the message to log
	 * @param exception the throwable to log (may be null)
	 */
	public void logDebug(Object message, Throwable exception) {
		logInternal(DEBUG, message, exception);
	}

	/**
	 * Logs the given message instance using the 
	 * 'error' level
	 * 
	 * @param message the message to log
	 */
	public void logError(Object message) {
		logInternal(ERROR, message, null);
	}

	/**
	 * Logs the given message and Throwable at
	 * the 'error' level.
	 * 
	 * @param message the message to log
	 * @param exception the throwable to log (may be null)
	 */
	public void logError(Object message, Throwable exception) {
		logInternal(ERROR, message, exception);
	}

	/**
	 * Logs the given message instance using the 
	 * 'fatal' level
	 * 
	 * @param message the message to log
	 */
	public void logFatal(Object message) {
		logInternal(FATAL, message, null);
	}

	/**
	 * Logs the given message and Throwable at
	 * the 'fatal' level.
	 * 
	 * @param message the message to log
	 * @param exception the throwable to log (may be null)
	 */
	public void logFatal(Object message, Throwable exception) {
		logInternal(FATAL, message, exception);
	}

	/**
	 * Logs the given message instance using the 
	 * 'info' level
	 * 
	 * @param message the message to log
	 */
	public void logInfo(Object message) {
		logInternal(INFO, message, null);
	}

	/**
	 * Logs the given message and Throwable at
	 * the 'info' level.
	 * 
	 * @param message the message to log
	 * @param exception the throwable to log (may be null)
	 */
	public void logInfo(Object message, Throwable exception) {
		logInternal(INFO, message, exception);
	}

	/**
	 * Logs the given message instance using the 
	 * 'trace' level
	 * 
	 * @param message the message to log
	 */
	public void logTrace(Object message) {
		logInternal(TRACE, message, null);
	}

	/**
	 * Logs the given message and Throwable at
	 * the 'trace' level.
	 * 
	 * @param message the message to log
	 * @param exception the throwable to log (may be null)
	 */
	public void logTrace(Object message, Throwable exception) {
		logInternal(TRACE, message, exception);
	}

	/**
	 * Logs the given message instance using the 
	 * 'warn' level
	 * 
	 * @param message the message to log
	 */
	public void logWarn(Object message) {
		logInternal(WARN, message, null);
	}

	/**
	 * Logs the given message and Throwable at
	 * the 'warn' level.
	 * 
	 * @param message the message to log
	 * @param exception the throwable to log (may be null)
	 */
	public void logWarn(Object message, Throwable exception) {
		logInternal(WARN, message, exception);
	}

    private String findCallingClassAndMethod(Throwable t) {
        String stackTraceAsString = Util.stackTraceToString(t);

        String callingClassAndMethod = "Caller information not available";

        int endInternalMethods = stackTraceAsString.lastIndexOf(
                "com.mysql.jdbc");

        if (endInternalMethods != -1) {
            int endOfLine = -1;
            int compliancePackage = stackTraceAsString.indexOf("com.mysql.jdbc.compliance",
                    endInternalMethods);

            if (compliancePackage != -1) {
                endOfLine = compliancePackage - LINE_SEPARATOR_LENGTH;
            } else {
                endOfLine = stackTraceAsString.indexOf(LINE_SEPARATOR,
                        endInternalMethods);
            }

            if (endOfLine != -1) {
                int nextEndOfLine = stackTraceAsString.indexOf(LINE_SEPARATOR,
                        endOfLine + LINE_SEPARATOR_LENGTH);

                if (nextEndOfLine != -1) {
                    callingClassAndMethod = stackTraceAsString.substring(endOfLine
                            + LINE_SEPARATOR_LENGTH, nextEndOfLine);
                } else {
                    callingClassAndMethod = stackTraceAsString.substring(endOfLine
                            + LINE_SEPARATOR_LENGTH);
                }
            }
        }

        if (!callingClassAndMethod.startsWith("at ")) {
            return "at " + callingClassAndMethod;
        }
            
        return callingClassAndMethod;
    }

    private void logInternal(int level, Object msg, Throwable exception) {
        StringBuffer msgBuf = new StringBuffer();
        msgBuf.append(new Date().toString());
        msgBuf.append(" ");

        switch (level) {
        case FATAL:
            msgBuf.append("FATAL: ");

            break;

        case ERROR:
            msgBuf.append("ERROR: ");

            break;

        case WARN:
            msgBuf.append("WARN: ");

            break;

        case INFO:
            msgBuf.append("INFO: ");

            break;

        case DEBUG:
            msgBuf.append("DEBUG: ");

            break;

        case TRACE:
            msgBuf.append("TRACE: ");

            break;
        }

        

        if (msg instanceof ProfilerEvent) {
            ProfilerEvent evt = (ProfilerEvent) msg;

            Throwable locationException = evt.getEventCreationPoint();

            if (locationException == null) {
                locationException = new Throwable();
            }

            msgBuf.append("Profiler Event: [");

            switch (evt.getEventType()) {
            case ProfilerEvent.TYPE_EXECUTE:
                msgBuf.append("EXECUTE");

                break;

            case ProfilerEvent.TYPE_FETCH:
                msgBuf.append("FETCH");

                break;

            case ProfilerEvent.TYPE_OBJECT_CREATION:
                msgBuf.append("CONSTRUCT");

                break;

            case ProfilerEvent.TYPE_PREPARE:
                msgBuf.append("PREPARE");

                break;

            case ProfilerEvent.TYPE_QUERY:
                msgBuf.append("QUERY");

                break;

            case ProfilerEvent.TYPE_WARN:
                msgBuf.append("WARN");

                break;

            default:
                msgBuf.append("UNKNOWN");
            }

            msgBuf.append("] ");
            msgBuf.append(findCallingClassAndMethod(locationException));
            msgBuf.append(" duration: ");
            msgBuf.append(evt.getEventDurationMillis());
            msgBuf.append(" ms, connection-id: ");
            msgBuf.append(evt.getConnectionId());
            msgBuf.append(", statement-id: ");
            msgBuf.append(evt.getStatementId());
            msgBuf.append(", resultset-id: ");
            msgBuf.append(evt.getResultSetId());

            String evtMessage = evt.getMessage();

            if (evtMessage != null) {
                msgBuf.append(", message: ");
                msgBuf.append(evtMessage);
            }
        } else {
            Throwable locationException = new Throwable();
            msgBuf.append(findCallingClassAndMethod(locationException));
            msgBuf.append(" ");

            if (msg != null) {
                msgBuf.append(String.valueOf(msg));
            }
        }

        if (exception != null) {
            msgBuf.append(LINE_SEPARATOR);
            msgBuf.append(LINE_SEPARATOR);
            msgBuf.append("EXCEPTION STACK TRACE:");
            msgBuf.append(LINE_SEPARATOR);
            msgBuf.append(LINE_SEPARATOR);
            msgBuf.append(Util.stackTraceToString(exception));
        }

        String messageAsString = msgBuf.toString();

        System.err.println(messageAsString);
        
        if (bufferedLog != null) {
        	bufferedLog.append(messageAsString);
        }
    }
}