package net.minecraft.util.profiling.jfr;

import com.mojang.logging.LogUtils;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.Reader;
import java.net.SocketAddress;
import java.net.URL;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.text.ParseException;
import java.time.Instant;
import java.time.ZoneId;
import java.time.format.DateTimeFormatter;
import java.time.format.DateTimeFormatterBuilder;
import java.util.Iterator;
import java.util.List;
import java.util.Locale;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import jdk.jfr.Configuration;
import jdk.jfr.Event;
import jdk.jfr.FlightRecorder;
import jdk.jfr.FlightRecorderListener;
import jdk.jfr.Recording;
import jdk.jfr.RecordingState;
import net.minecraft.FileUtil;
import net.minecraft.SharedConstants;
import net.minecraft.Util;
import net.minecraft.core.Holder;
import net.minecraft.network.ConnectionProtocol;
import net.minecraft.network.protocol.PacketType;
import net.minecraft.resources.ResourceKey;
import net.minecraft.util.profiling.jfr.callback.ProfiledDuration;
import net.minecraft.util.profiling.jfr.event.ChunkGenerationEvent;
import net.minecraft.util.profiling.jfr.event.ChunkRegionReadEvent;
import net.minecraft.util.profiling.jfr.event.ChunkRegionWriteEvent;
import net.minecraft.util.profiling.jfr.event.NetworkSummaryEvent;
import net.minecraft.util.profiling.jfr.event.PacketReceivedEvent;
import net.minecraft.util.profiling.jfr.event.PacketSentEvent;
import net.minecraft.util.profiling.jfr.event.ServerTickTimeEvent;
import net.minecraft.util.profiling.jfr.event.StructureGenerationEvent;
import net.minecraft.util.profiling.jfr.event.WorldLoadFinishedEvent;
import net.minecraft.util.profiling.jfr.event.NetworkSummaryEvent.SumAggregation;
import net.minecraft.world.level.ChunkPos;
import net.minecraft.world.level.Level;
import net.minecraft.world.level.chunk.storage.RegionFileVersion;
import net.minecraft.world.level.chunk.storage.RegionStorageInfo;
import net.minecraft.world.level.levelgen.structure.Structure;
import org.jetbrains.annotations.Nullable;
import org.slf4j.Logger;

public class JfrProfiler implements JvmProfiler {
	private static final Logger LOGGER = LogUtils.getLogger();
	public static final String ROOT_CATEGORY = "Minecraft";
	public static final String WORLD_GEN_CATEGORY = "World Generation";
	public static final String TICK_CATEGORY = "Ticking";
	public static final String NETWORK_CATEGORY = "Network";
	public static final String STORAGE_CATEGORY = "Storage";
	private static final List<Class<? extends Event>> CUSTOM_EVENTS = List.of(
		ChunkGenerationEvent.class,
		ChunkRegionReadEvent.class,
		ChunkRegionWriteEvent.class,
		PacketReceivedEvent.class,
		PacketSentEvent.class,
		NetworkSummaryEvent.class,
		ServerTickTimeEvent.class,
		StructureGenerationEvent.class,
		WorldLoadFinishedEvent.class
	);
	private static final String FLIGHT_RECORDER_CONFIG = "/flightrecorder-config.jfc";
	private static final DateTimeFormatter DATE_TIME_FORMATTER = new DateTimeFormatterBuilder()
		.appendPattern("yyyy-MM-dd-HHmmss")
		.toFormatter()
		.withZone(ZoneId.systemDefault());
	private static final JfrProfiler INSTANCE = new JfrProfiler();
	@Nullable
	Recording recording;
	private float currentAverageTickTime;
	private final Map<String, SumAggregation> networkTrafficByAddress = new ConcurrentHashMap();

	private JfrProfiler() {
		CUSTOM_EVENTS.forEach(FlightRecorder::register);
		FlightRecorder.addPeriodicEvent(ServerTickTimeEvent.class, () -> new ServerTickTimeEvent(this.currentAverageTickTime).commit());
		FlightRecorder.addPeriodicEvent(NetworkSummaryEvent.class, () -> {
			Iterator<SumAggregation> iterator = this.networkTrafficByAddress.values().iterator();

			while (iterator.hasNext()) {
				((SumAggregation)iterator.next()).commitEvent();
				iterator.remove();
			}
		});
	}

	public static JfrProfiler getInstance() {
		return INSTANCE;
	}

	@Override
	public boolean start(Environment environment) {
		URL uRL = JfrProfiler.class.getResource("/flightrecorder-config.jfc");
		if (uRL == null) {
			LOGGER.warn("Could not find default flight recorder config at {}", "/flightrecorder-config.jfc");
			return false;
		} else {
			try {
				BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(uRL.openStream()));

				boolean var4;
				try {
					var4 = this.start(bufferedReader, environment);
				} catch (Throwable var7) {
					try {
						bufferedReader.close();
					} catch (Throwable var6) {
						var7.addSuppressed(var6);
					}

					throw var7;
				}

				bufferedReader.close();
				return var4;
			} catch (IOException var8) {
				LOGGER.warn("Failed to start flight recorder using configuration at {}", uRL, var8);
				return false;
			}
		}
	}

	@Override
	public Path stop() {
		if (this.recording == null) {
			throw new IllegalStateException("Not currently profiling");
		} else {
			this.networkTrafficByAddress.clear();
			Path path = this.recording.getDestination();
			this.recording.stop();
			return path;
		}
	}

	@Override
	public boolean isRunning() {
		return this.recording != null;
	}

	@Override
	public boolean isAvailable() {
		return FlightRecorder.isAvailable();
	}

	private boolean start(Reader reader, Environment environment) {
		if (this.isRunning()) {
			LOGGER.warn("Profiling already in progress");
			return false;
		} else {
			try {
				Configuration configuration = Configuration.create(reader);
				String string = DATE_TIME_FORMATTER.format(Instant.now());
				this.recording = Util.make(new Recording(configuration), recording -> {
					CUSTOM_EVENTS.forEach(recording::enable);
					recording.setDumpOnExit(true);
					recording.setToDisk(true);
					recording.setName(String.format(Locale.ROOT, "%s-%s-%s", environment.getDescription(), SharedConstants.getCurrentVersion().getName(), string));
				});
				Path path = Paths.get(String.format(Locale.ROOT, "debug/%s-%s.jfr", environment.getDescription(), string));
				FileUtil.createDirectoriesSafe(path.getParent());
				this.recording.setDestination(path);
				this.recording.start();
				this.setupSummaryListener();
			} catch (ParseException | IOException var6) {
				LOGGER.warn("Failed to start jfr profiling", (Throwable)var6);
				return false;
			}

			LOGGER.info(
				"Started flight recorder profiling id({}):name({}) - will dump to {} on exit or stop command",
				this.recording.getId(),
				this.recording.getName(),
				this.recording.getDestination()
			);
			return true;
		}
	}

	private void setupSummaryListener() {
		FlightRecorder.addListener(new FlightRecorderListener() {
			final SummaryReporter summaryReporter = new SummaryReporter(() -> JfrProfiler.this.recording = null);

			public void recordingStateChanged(Recording recording) {
				if (recording == JfrProfiler.this.recording && recording.getState() == RecordingState.STOPPED) {
					this.summaryReporter.recordingStopped(recording.getDestination());
					FlightRecorder.removeListener(this);
				}
			}
		});
	}

	@Override
	public void onServerTick(float currentAverageTickTime) {
		if (ServerTickTimeEvent.TYPE.isEnabled()) {
			this.currentAverageTickTime = currentAverageTickTime;
		}
	}

	@Override
	public void onPacketReceived(ConnectionProtocol protocol, PacketType<?> packetType, SocketAddress address, int size) {
		if (PacketReceivedEvent.TYPE.isEnabled()) {
			new PacketReceivedEvent(protocol.id(), packetType.flow().id(), packetType.id().toString(), address, size).commit();
		}

		if (NetworkSummaryEvent.TYPE.isEnabled()) {
			this.networkStatFor(address).trackReceivedPacket(size);
		}
	}

	@Override
	public void onPacketSent(ConnectionProtocol protocol, PacketType<?> packetType, SocketAddress address, int size) {
		if (PacketSentEvent.TYPE.isEnabled()) {
			new PacketSentEvent(protocol.id(), packetType.flow().id(), packetType.id().toString(), address, size).commit();
		}

		if (NetworkSummaryEvent.TYPE.isEnabled()) {
			this.networkStatFor(address).trackSentPacket(size);
		}
	}

	private SumAggregation networkStatFor(SocketAddress remoteAddress) {
		return (SumAggregation)this.networkTrafficByAddress.computeIfAbsent(remoteAddress.toString(), SumAggregation::new);
	}

	@Override
	public void onRegionFileRead(RegionStorageInfo regionStorageInfo, ChunkPos chunkPos, RegionFileVersion version, int bytes) {
		if (ChunkRegionReadEvent.TYPE.isEnabled()) {
			new ChunkRegionReadEvent(regionStorageInfo, chunkPos, version, bytes).commit();
		}
	}

	@Override
	public void onRegionFileWrite(RegionStorageInfo regionStorageInfo, ChunkPos chunkPos, RegionFileVersion version, int bytes) {
		if (ChunkRegionWriteEvent.TYPE.isEnabled()) {
			new ChunkRegionWriteEvent(regionStorageInfo, chunkPos, version, bytes).commit();
		}
	}

	@Nullable
	@Override
	public ProfiledDuration onWorldLoadedStarted() {
		if (!WorldLoadFinishedEvent.TYPE.isEnabled()) {
			return null;
		} else {
			WorldLoadFinishedEvent worldLoadFinishedEvent = new WorldLoadFinishedEvent();
			worldLoadFinishedEvent.begin();
			return bl -> worldLoadFinishedEvent.commit();
		}
	}

	@Nullable
	@Override
	public ProfiledDuration onChunkGenerate(ChunkPos chunkPos, ResourceKey<Level> level, String name) {
		if (!ChunkGenerationEvent.TYPE.isEnabled()) {
			return null;
		} else {
			ChunkGenerationEvent chunkGenerationEvent = new ChunkGenerationEvent(chunkPos, level, name);
			chunkGenerationEvent.begin();
			return bl -> chunkGenerationEvent.commit();
		}
	}

	@Nullable
	@Override
	public ProfiledDuration onStructureGenerate(ChunkPos chunkPos, ResourceKey<Level> level, Holder<Structure> structure) {
		if (!StructureGenerationEvent.TYPE.isEnabled()) {
			return null;
		} else {
			StructureGenerationEvent structureGenerationEvent = new StructureGenerationEvent(chunkPos, structure, level);
			structureGenerationEvent.begin();
			return bl -> {
				structureGenerationEvent.success = bl;
				structureGenerationEvent.commit();
			};
		}
	}
}