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package biz.paluch.logging.gelf.wildfly;

import static biz.paluch.logging.gelf.LogMessageField.NamedLogField.*;

import java.util.logging.ErrorManager;
import java.util.logging.LogRecord;

import org.jboss.logmanager.ExtLogRecord;
import org.jboss.logmanager.errormanager.OnlyOnceErrorManager;

import biz.paluch.logging.gelf.GelfMessageAssembler;
import biz.paluch.logging.gelf.LogMessageField;
import biz.paluch.logging.gelf.MdcGelfMessageAssembler;
import biz.paluch.logging.gelf.intern.GelfMessage;
import biz.paluch.logging.gelf.jboss7.JBoss7JulLogEvent;
import biz.paluch.logging.gelf.jul.GelfLogHandler;

/**
 * Logging-Handler for GELF (Graylog Extended Logging Format). This Java-Util-Logging Handler creates GELF Messages and posts
 * them using UDP (default) or TCP. Following parameters are supported/needed:
 * 
 * host (Mandatory): Hostname/IP-Address of the Logstash Host
 * 
 * (the host) for UDP, e.g. 127.0.0.1 or some.host.com
 * See docs for more details
 * 
 * 
 * enabled (Optional): Whether this handler is enabled, default true
 * port (Optional): Port, default 12201
 * originHost (Optional): Originating Hostname, default FQDN Hostname
 * extractStacktrace (Optional): Post Stack-Trace to StackTrace field, default false
 * extractStackTrace (Optional): Post Stack-Trace to StackTrace field (true/false/throwable reference [0 = throwable, 1 =
 * throwable.cause, -1 = root cause]), default false
 * filterStackTrace (Optional): Perform Stack-Trace filtering (true/false), default false
 * includeLogMessageParameters (Optional): Include message parameters from the log event (see
 * {@link LogRecord#getParameters()}, default true
 * includeLocation (Optional): Include source code location, default true
 * facility (Optional): Name of the Facility, default gelf-java
 * level (Optional): Log-Level, default INFO
 * filter (Optional): Class-Name of a Log-Filter, default none
 * additionalFields(number) (Optional): Post additional fields. Eg. fieldName=Value,field2=value2
 * additionalFieldTypes (Optional): Type specification for additional and MDC fields. Supported types: String, long, Long,
 * double, Double and discover (default if not specified, discover field type on parseability). Eg. field=String,field2=double
 * mdcFields (Optional): Post additional fields, pull Values from MDC. Name of the Fields are comma-separated
 * Application,Version,SomeOtherFieldName
 * dynamicMdcFields (Optional): Dynamic MDC Fields allows you to extract MDC values based on one or more regular
 * expressions. Multiple regex are comma-separated. The name of the MDC entry is used as GELF field name. Eg.
 * mdc.*,[mdc|MDC]fields
 * includeFullMdc (Optional): Include all fields from the MDC, default false
 * 
 *  MDC Profiling
 * 
 * MDC Profiling allows to calculate the runtime from request start up to the time until the log message was generated. You must
 * set one value in the MDC:
 * 

 * profiling.requestStart.millis: Time Millis of the Request-Start (Long or String)
 * 
 * 
 * Two values are set by the Log Appender:
 * 
 * 
 * profiling.requestEnd: End-Time of the Request-End in Date.toString-representation
 * profiling.requestDuration: Duration of the request (e.g. 205ms, 16sec)
 * 
 * The {@link #publish(LogRecord)} method is thread-safe and may be called by different threads at any time.
 *
 * @author Mark Paluch
 * @author Christoph Linder
 */
public class WildFlyGelfLogHandler extends GelfLogHandler {
    private static final ErrorManager DEFAULT_ERROR_MANAGER = new OnlyOnceErrorManager();
    private boolean enabled = true;

    public WildFlyGelfLogHandler() {
        super();
        super.setErrorManager(DEFAULT_ERROR_MANAGER);
    }

    public boolean isEnabled() {
        return enabled;
    }

    /**
     * Manually enable/disable the handler. This is also called by wildfly logger setup routines on server-startup with the
     * value of the "enabled" attribute of {@code }.
     *
     * @param enabled {@literal false} to disable this handler.
     */
    public void setEnabled(boolean enabled) {
        this.enabled = enabled;
    }

    @Override
    protected void initializeDefaultFields() {
        gelfMessageAssembler.addFields(LogMessageField.getDefaultMapping(Time, Severity, ThreadName, SourceClassName,
                SourceMethodName, SourceSimpleClassName, LoggerName, NDC));
    }

    @Override
    public boolean isLoggable(LogRecord record) {
        return enabled && super.isLoggable(record);
    }

    @Override
    public void publish(LogRecord record) {
        super.publish(ExtLogRecord.wrap(record));
    }

    @Override
    protected GelfMessageAssembler createGelfMessageAssembler() {
        return new MdcGelfMessageAssembler();
    }

    @Override
    protected GelfMessage createGelfMessage(final LogRecord record) {
        return getGelfMessageAssembler().createGelfMessage(new JBoss7JulLogEvent((ExtLogRecord) record));
    }

    public boolean isMdcProfiling() {
        return getGelfMessageAssembler().isMdcProfiling();
    }

    public void setMdcProfiling(boolean mdcProfiling) {
        getGelfMessageAssembler().setMdcProfiling(mdcProfiling);
    }

    public boolean isIncludeFullMdc() {
        return getGelfMessageAssembler().isIncludeFullMdc();
    }

    public void setIncludeFullMdc(boolean includeFullMdc) {
        getGelfMessageAssembler().setIncludeFullMdc(includeFullMdc);
    }

    private MdcGelfMessageAssembler getGelfMessageAssembler() {
        return (MdcGelfMessageAssembler) gelfMessageAssembler;
    }

}