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package biz.paluch.logging.gelf.log4j;

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

import java.util.Collections;

import org.apache.log4j.AppenderSkeleton;
import org.apache.log4j.spi.LoggingEvent;

import biz.paluch.logging.RuntimeContainer;
import biz.paluch.logging.gelf.LogMessageField;
import biz.paluch.logging.gelf.MdcGelfMessageAssembler;
import biz.paluch.logging.gelf.intern.*;

/**
 * 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
 * 
 * 
 * port (Optional): Port, default 12201
 * version (Optional): GELF Version 1.0 or 1.1, default 1.0
 * originHost (Optional): Originating Hostname, default FQDN Hostname
 * 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
 * includeLocation (Optional): Include source code location, default true
 * mdcProfiling (Optional): Perform Profiling (Call-Duration) based on MDC Data. See MDC
 * Profiling, default false
 * facility (Optional): Name of the Facility, default gelf-java
 * threshold (Optional): Log-Level, default INFO
 * filter (Optional): Class-Name of a Log-Filter, default none
 * additionalFields(number) (Optional): Post additional fields. Eg.
 * .GelfLogHandler.additionalFields=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
 * mdcFields=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.
 * dynamicMdcFieldTypes (Optional): Pattern-based type specification for additional and MDC fields. Key-value pairs are
 * comma-separated. Supported types: String, long, Long, double, Double. Eg. my_field.*=String,business\..*\.field=double
 * 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 #append(LoggingEvent)} method is thread-safe and may be called by different threads at any time.
 *
 * @author Mark Paluch
 */
public class GelfLogAppender extends AppenderSkeleton implements ErrorReporter {

    protected GelfSender gelfSender;
    protected MdcGelfMessageAssembler gelfMessageAssembler;
    private final ErrorReporter errorReporter = new MessagePostprocessingErrorReporter(this);

    public GelfLogAppender() {
        super();

        RuntimeContainer.initialize(errorReporter);
        gelfMessageAssembler = new MdcGelfMessageAssembler();
        gelfMessageAssembler.addFields(LogMessageField.getDefaultMapping(Time, Severity, ThreadName, SourceClassName,
                SourceMethodName, SourceLineNumber, SourceSimpleClassName, LoggerName, NDC, Server));
    }

    @Override
    protected void append(LoggingEvent event) {

        if (event == null) {
            return;
        }

        try {
            GelfMessage message = createGelfMessage(event);
            if (!message.isValid()) {
                reportError("GELF Message is invalid: " + message.toJson(), null);
                return;
            }

            if (null == gelfSender || !gelfSender.sendMessage(message)) {
                reportError("Could not send GELF message", null);
            }
        } catch (Exception e) {
            reportError("Could not send GELF message: " + e.getMessage(), e);
        }
    }

    protected GelfSender createGelfSender() {
        return GelfSenderFactory.createSender(gelfMessageAssembler, errorReporter, Collections.emptyMap());
    }

    @Override
    public void reportError(String message, Exception exception) {
        errorHandler.error(message, exception, 0);
    }

    @Override
    public boolean requiresLayout() {
        return false;
    }

    @Override
    public void activateOptions() {

        if (null == gelfSender) {
            gelfSender = createGelfSender();
        }
    }

    @Override
    public void close() {
        if (null != gelfSender) {
            Closer.close(gelfSender);
            gelfSender = null;
        }
    }

    protected GelfMessage createGelfMessage(final LoggingEvent loggingEvent) {
        return gelfMessageAssembler.createGelfMessage(new Log4jLogEvent(loggingEvent));
    }

    public void setAdditionalFields(String spec) {
        ConfigurationSupport.setAdditionalFields(spec, gelfMessageAssembler);
    }

    public void setAdditionalFieldTypes(String spec) {
        ConfigurationSupport.setAdditionalFieldTypes(spec, gelfMessageAssembler);
    }

    public void setMdcFields(String spec) {
        ConfigurationSupport.setMdcFields(spec, gelfMessageAssembler);
    }

    public void setDynamicMdcFields(String spec) {
        ConfigurationSupport.setDynamicMdcFields(spec, gelfMessageAssembler);
    }

    public void setDynamicMdcFieldTypes(String spec) {
        ConfigurationSupport.setDynamicMdcFieldTypes(spec, gelfMessageAssembler);
    }

    public String getGraylogHost() {
        return gelfMessageAssembler.getHost();
    }

    public void setGraylogHost(String graylogHost) {
        gelfMessageAssembler.setHost(graylogHost);
    }

    public int getGraylogPort() {
        return gelfMessageAssembler.getPort();
    }

    public void setGraylogPort(int graylogPort) {
        gelfMessageAssembler.setPort(graylogPort);
    }

    public String getHost() {
        return gelfMessageAssembler.getHost();
    }

    public void setHost(String host) {
        gelfMessageAssembler.setHost(host);
    }

    public int getPort() {
        return gelfMessageAssembler.getPort();
    }

    public void setPort(int port) {
        gelfMessageAssembler.setPort(port);
    }

    public String getOriginHost() {
        return gelfMessageAssembler.getOriginHost();
    }

    public void setOriginHost(String originHost) {
        gelfMessageAssembler.setOriginHost(originHost);
    }

    public String getFacility() {
        return gelfMessageAssembler.getFacility();
    }

    public void setFacility(String facility) {
        gelfMessageAssembler.setFacility(facility);
    }

    public String getExtractStackTrace() {
        return gelfMessageAssembler.getExtractStackTrace();
    }

    public void setExtractStackTrace(String extractStacktrace) {
        gelfMessageAssembler.setExtractStackTrace(extractStacktrace);
    }

    public boolean isFilterStackTrace() {
        return gelfMessageAssembler.isFilterStackTrace();
    }

    public void setFilterStackTrace(boolean filterStackTrace) {
        gelfMessageAssembler.setFilterStackTrace(filterStackTrace);
    }

    public boolean isIncludeLocation() {
        return gelfMessageAssembler.isIncludeLocation();
    }

    public void setIncludeLocation(boolean includeLocation) {
        gelfMessageAssembler.setIncludeLocation(includeLocation);
    }

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

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

    public String getTimestampPattern() {
        return gelfMessageAssembler.getTimestampPattern();
    }

    public void setTimestampPattern(String timestampPattern) {
        gelfMessageAssembler.setTimestampPattern(timestampPattern);
    }

    public int getMaximumMessageSize() {
        return gelfMessageAssembler.getMaximumMessageSize();
    }

    public void setMaximumMessageSize(int maximumMessageSize) {
        gelfMessageAssembler.setMaximumMessageSize(maximumMessageSize);
    }

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

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

    public String getVersion() {
        return gelfMessageAssembler.getVersion();
    }

    public void setVersion(String version) {
        gelfMessageAssembler.setVersion(version);
    }

}