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/**
 * Copyright (C) 2011 - 101loops.com 
 *
 * 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 com.crashnote.jul;

import com.crashnote.ICrashAppender;
import com.crashnote.core.model.types.LogLevel;
import com.crashnote.jul.impl.JulEvt;
import com.crashnote.logger.config.LoggerConfig;
import com.crashnote.logger.config.LoggerConfigFactory;
import com.crashnote.logger.report.LoggerReporter;

import java.util.Map;
import java.util.logging.Handler;
import java.util.logging.Level;
import java.util.logging.LogRecord;
import java.util.logging.Logger;

/**
 * Appender that writes logs from 'Java Logging API (JUL)' to the cloud
 */
public class CrashHandler
        extends Handler implements ICrashAppender {

    // VARS =======================================================================================

    private boolean started;
    private Level logLevel = Level.INFO;

    //private MDCAdapter mdc;
    private LoggerReporter reporter;

    // config
    private LoggerConfig config;
    private final LoggerConfigFactory configFactory;


    // SETUP ======================================================================================

    public CrashHandler() {
        this(new LoggerConfigFactory());
    }

    public CrashHandler(final LoggerConfigFactory configFactory) {
        this.configFactory = configFactory;
        init();
    }

    public CrashHandler(final LoggerConfig config, final LoggerReporter reporter) {
        this.config = config;
        this.reporter = reporter;
        this.configFactory = null;
        init();
    }

    private void init() {
        /*
        try {
            mdc = MDC.getMDCAdapter();
        } catch (Exception ignored) {
            mdc = null;
        }
        */
        start();
    }


    // INTERFACE ==================================================================================

    @Override
    public void publish(final LogRecord record) {
        if (isLoggable(record))
            getReporter().reportLog(new JulEvt(record, getContext()));
    }

    @Override
    public void flush() {
        // nothing to do
    }

    @Override
    public boolean isStarted() {
        return started;
    }

    /**
     * Set the minimum log level for the handler, so it does not accept records with lower level.
     * Cannot use setLevel() from base class since it throws an AccessControlException on AppEngine.
     */
    @Override
    public void setLogLevel(final LogLevel lvl) {
        if (lvl == LogLevel.DEBUG)
            logLevel = Level.FINE;
        else if (lvl == LogLevel.INFO)
            logLevel = Level.INFO;
        else if (lvl == LogLevel.WARN)
            logLevel = Level.WARNING;
        else
            logLevel = Level.SEVERE;
    }

    @Override
    public boolean isLoggable(final LogRecord record) {
        return record.getLevel().intValue() >= logLevel.intValue() &&
                getReporter().doAcceptLog(record.getLoggerName());
    }

    @Override
    public void close() throws SecurityException {
        if (started) {
            getReporter().stop();
            started = false;
        }
    }

    public static Logger getTargetLogger(final Class clazz) {
        return Logger.getLogger(clazz.getName());
    }


    // INTERNALS ==================================================================================

    private void start() {
        if (!started) {
            setLogLevel(getConfig().getLogLevel());
            getReporter().start();
            started = true;
        }
    }

    private LoggerConfig getConfig() {
        if (config == null)
            config = (LoggerConfig) configFactory.get();
        return config;
    }

    private LoggerReporter getReporter() {
        if (reporter == null) reporter = getConfig().getReporter();
        return reporter;
    }

    private Map getContext() {
        return null;
        //return (mdc != null) ? mdc.getCopyOfContextMap() : null;
    }

}