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package org.gridkit.jvmtool.stacktrace.codec.json;

import org.gridkit.jvmtool.codec.stacktrace.ThreadSnapshotEventPojo;
import org.gridkit.jvmtool.event.GenericEvent;
import org.gridkit.jvmtool.jvmevents.JvmEvents;
import org.gridkit.jvmtool.stacktrace.StackFrameArray;
import org.gridkit.jvmtool.stacktrace.StackFrameList;
import org.gridkit.jvmtool.stacktrace.codec.json.JsonStreamHandler.JsonEntityHandler;
import org.gridkit.jvmtool.stacktrace.codec.json.JsonStreamHandler.JsonObjectHandler;

class JfrJavaExceptionThrowHandler implements JsonObjectHandler {

	public static final String TYPE_ID = "jdk.JavaExceptionThrow";

	private final JfrEventParser parser;
	private GenericEvent event = new GenericEvent();
	private StackFrameList threadTrace;

	private ThreadInfoHandler threadInfo = new ThreadInfoHandler() {

		@Override
		protected void onComplete() {
			if (this.javaName != null) {
				event.tags().put(JvmEvents.THREAD_NAME, this.javaName);
			}
			if (this.javaThreadId > 0) {
				event.counters().set(JvmEvents.THREAD_ID, this.javaThreadId);
			}
		}
	};

	private StackTraceHandler stackTrace = new StackTraceHandler() {

		@Override
		protected void onComplete() {
			threadTrace = new StackFrameArray(frames);
		}
	};

	public JfrJavaExceptionThrowHandler(JfrEventParser parser) {
		this.parser = parser;
	}

	@Override
	public void onScalarFieldValue(String fieldName, Object val) {
		if (val != null) {
			if ("startTime".equals(fieldName)) {
				JfrHelper.setTimestamp(event, val);
			}
			else if ("state".equals(fieldName)) {
				JfrHelper.setThreadState(event, val);
			}
			else if ("message".equals(fieldName)) {
				event.tags().put("exception.message", String.valueOf(val));
			}
		}
	}

	@Override
	public JsonEntityHandler onEntityField(String fieldName) {
		if ("eventThread".equals(fieldName)) {
			return threadInfo;
		}
		else if ("stackTrace".equals(fieldName)) {
			return stackTrace;
		}
		else {
			return JsonStreamHandler.NULL_HANDLER;
		}
	}

	@Override
	public void onObjectComplete() {
		event.tags().put("jfr.typeId", TYPE_ID);
		event.tags().put(JvmEvents.THREAD_STATE, "RUNNABLE"); // inferred from event JFR type
		ThreadSnapshotEventPojo cevent = new ThreadSnapshotEventPojo();
		cevent.loadFromRawEvent(event);
		cevent.stackTrace(threadTrace);
		parser.push(cevent);
		event = new GenericEvent();
	}
}