/*
 * Copyright (c) 2002, 2023, Oracle and/or its affiliates.
 *
 * This program is free software; you can redistribute it and/or modify it under
 * the terms of the GNU General Public License, version 2.0, as published by the
 * Free Software Foundation.
 *
 * This program is also distributed with certain software (including but not
 * limited to OpenSSL) that is licensed under separate terms, as designated in a
 * particular file or component or in included license documentation. The
 * authors of MySQL hereby grant you an additional permission to link the
 * program and your derivative works with the separately licensed software that
 * they have included with MySQL.
 *
 * Without limiting anything contained in the foregoing, this file, which is
 * part of MySQL Connector/J, is also subject to the Universal FOSS Exception,
 * version 1.0, a copy of which can be found at
 * http://oss.oracle.com/licenses/universal-foss-exception.
 *
 * 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, version 2.0,
 * 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.,
 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301  USA
 */

package com.mysql.cj.log;

import java.util.Date;

import com.mysql.cj.util.LogUtils;
import com.mysql.cj.util.Util;

/**
 * Provides logging facilities for those platforms that don't have built-in facilities. Simply logs messages to STDERR.
 */
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 boolean logLocationInfo = true;

    /**
     * Creates a new StandardLogger object.
     *
     * @param name
     *            the name of the configuration to use -- ignored
     */
    public StandardLogger(String name) {
        this(name, false);
    }

    /**
     * @param name
     *            the name of the configuration to use -- ignored
     * @param logLocationInfo
     *            logLocationInfo
     */
    public StandardLogger(String name, boolean logLocationInfo) {
        this.logLocationInfo = logLocationInfo;
    }

    @Override
    public boolean isDebugEnabled() {
        return true;
    }

    @Override
    public boolean isErrorEnabled() {
        return true;
    }

    @Override
    public boolean isFatalEnabled() {
        return true;
    }

    @Override
    public boolean isInfoEnabled() {
        return true;
    }

    @Override
    public boolean isTraceEnabled() {
        return true;
    }

    @Override
    public boolean isWarnEnabled() {
        return true;
    }

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

    protected String logInternal(int level, Object msg, Throwable exception) {
        StringBuilder msgBuf = new StringBuilder();
        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) {
            msgBuf.append(msg.toString());

        } else {
            if (this.logLocationInfo && level != TRACE) {
                Throwable locationException = new Throwable();
                msgBuf.append(LogUtils.findCallingClassAndMethod(locationException));
                msgBuf.append(" ");
            }

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

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

        String messageAsString = msgBuf.toString();

        System.err.println(messageAsString);

        return messageAsString;
    }

}
