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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.logger.helper;

import com.crashnote.core.Lifecycle;
import com.crashnote.core.model.excp.CrashnoteException;
import com.crashnote.jul.impl.JulConnector;
import com.crashnote.log4j.impl.Log4jConnector;
import com.crashnote.logback.impl.LogbackConnector;
import com.crashnote.logger.config.LoggerConfig;
import com.crashnote.logger.report.LoggerReporter;

import java.util.*;

/**
 * Utility class to connect/attach log appenders to an according logging framework(s).
 */
public class AutoLogConnector
    implements Lifecycle {

    private boolean started;
    private final List connectors;

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

    public AutoLogConnector(final LoggerConfig config, final LoggerReporter reporter) {

        connectors = new ArrayList(3);

        final Class[] connectorsSrc = getConnectorSources();
        for (final Class cls : connectorsSrc) {
            connect(cls, config, reporter);
        }
    }

    // LIFECYCLE ==================================================================================

    @Override
    public boolean start() {
        if (!started) {
            started = true;

            // make sure there is at least one connector
            if (connectors.isEmpty())
                throw new CrashnoteException("unable to start: no log connector could be initialized");
        }

        return started;
    }

    @Override
    public boolean stop() {
        if (started) {
            started = false;

            // stop each connector one by one
            for (final LogConnector c : connectors) c.stop();
        }

        return started;
    }

    // SHARED =====================================================================================

    protected Class[] getConnectorSources() {
        return new Class[]{LogbackConnector.class, Log4jConnector.class, JulConnector.class};
    }

    // INTERNAL ===================================================================================

    private void connect(final Class cls,
                         final LoggerConfig config, final LoggerReporter reporter) {
        try {
            // instantiate
            final LogConnector c = cls.newInstance();
            try {
                // start-up
                c.start(config, reporter);
                connectors.add(c);
            } catch (Throwable e) {
                c.err("unable to connect to logger", e);
            }
        } catch (Throwable e) {
            // ignore
        }
    }

    // GET ========================================================================================

    public List getConnectors() {
        return connectors;
    }
}