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 javax.annotation.Nullable;
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.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.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, NetworkSummaryEvent.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<NetworkSummaryEvent.SumAggregation> iterator = this.networkTrafficByAddress.values().iterator();

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

    public static JfrProfiler getInstance() {
        return INSTANCE;
    }

    @Override
    public boolean start(Environment p_185307_) {
        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 {
                boolean flag;
                try (BufferedReader bufferedreader = new BufferedReader(new InputStreamReader(url.openStream()))) {
                    flag = this.start(bufferedreader, p_185307_);
                }

                return flag;
            } catch (IOException ioexception) {
                LOGGER.warn("Failed to start flight recorder using configuration at {}", url, ioexception);
                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 p_185317_, Environment p_185318_) {
        if (this.isRunning()) {
            LOGGER.warn("Profiling already in progress");
            return false;
        } else {
            try {
                Configuration configuration = Configuration.create(p_185317_);
                String s = DATE_TIME_FORMATTER.format(Instant.now());
                this.recording = Util.make(new Recording(configuration), p_185311_ -> {
                    CUSTOM_EVENTS.forEach(p_185311_::enable);
                    p_185311_.setDumpOnExit(true);
                    p_185311_.setToDisk(true);
                    p_185311_.setName(String.format(Locale.ROOT, "%s-%s-%s", p_185318_.getDescription(), SharedConstants.getCurrentVersion().getName(), s));
                });
                Path path = Paths.get(String.format(Locale.ROOT, "debug/%s-%s.jfr", p_185318_.getDescription(), s));
                FileUtil.createDirectoriesSafe(path.getParent());
                this.recording.setDestination(path);
                this.recording.start();
                this.setupSummaryListener();
            } catch (ParseException | IOException ioexception) {
                LOGGER.warn("Failed to start jfr profiling", (Throwable)ioexception);
                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);

            @Override
            public void recordingStateChanged(Recording p_185339_) {
                if (p_185339_ == JfrProfiler.this.recording && p_185339_.getState() == RecordingState.STOPPED) {
                    this.summaryReporter.recordingStopped(p_185339_.getDestination());
                    FlightRecorder.removeListener(this);
                }
            }
        });
    }

    @Override
    public void onServerTick(float p_185300_) {
        if (ServerTickTimeEvent.TYPE.isEnabled()) {
            this.currentAverageTickTime = p_185300_;
        }
    }

    @Override
    public void onPacketReceived(ConnectionProtocol p_300094_, PacketType<?> p_335626_, SocketAddress p_185304_, int p_185302_) {
        if (PacketReceivedEvent.TYPE.isEnabled()) {
            new PacketReceivedEvent(p_300094_.id(), p_335626_.flow().id(), p_335626_.id().toString(), p_185304_, p_185302_).commit();
        }

        if (NetworkSummaryEvent.TYPE.isEnabled()) {
            this.networkStatFor(p_185304_).trackReceivedPacket(p_185302_);
        }
    }

    @Override
    public void onPacketSent(ConnectionProtocol p_299489_, PacketType<?> p_334491_, SocketAddress p_185325_, int p_185323_) {
        if (PacketSentEvent.TYPE.isEnabled()) {
            new PacketSentEvent(p_299489_.id(), p_334491_.flow().id(), p_334491_.id().toString(), p_185325_, p_185323_).commit();
        }

        if (NetworkSummaryEvent.TYPE.isEnabled()) {
            this.networkStatFor(p_185325_).trackSentPacket(p_185323_);
        }
    }

    private NetworkSummaryEvent.SumAggregation networkStatFor(SocketAddress p_185320_) {
        return this.networkTrafficByAddress.computeIfAbsent(p_185320_.toString(), NetworkSummaryEvent.SumAggregation::new);
    }

    @Override
    public void onRegionFileRead(RegionStorageInfo p_332602_, ChunkPos p_331074_, RegionFileVersion p_332565_, int p_334299_) {
        if (ChunkRegionReadEvent.TYPE.isEnabled()) {
            new ChunkRegionReadEvent(p_332602_, p_331074_, p_332565_, p_334299_).commit();
        }
    }

    @Override
    public void onRegionFileWrite(RegionStorageInfo p_334895_, ChunkPos p_330898_, RegionFileVersion p_334334_, int p_334429_) {
        if (ChunkRegionWriteEvent.TYPE.isEnabled()) {
            new ChunkRegionWriteEvent(p_334895_, p_330898_, p_334334_, p_334429_).commit();
        }
    }

    @Nullable
    @Override
    public ProfiledDuration onWorldLoadedStarted() {
        if (!WorldLoadFinishedEvent.TYPE.isEnabled()) {
            return null;
        } else {
            WorldLoadFinishedEvent worldloadfinishedevent = new WorldLoadFinishedEvent();
            worldloadfinishedevent.begin();
            return p_374913_ -> worldloadfinishedevent.commit();
        }
    }

    @Nullable
    @Override
    public ProfiledDuration onChunkGenerate(ChunkPos p_185313_, ResourceKey<Level> p_185314_, String p_185315_) {
        if (!ChunkGenerationEvent.TYPE.isEnabled()) {
            return null;
        } else {
            ChunkGenerationEvent chunkgenerationevent = new ChunkGenerationEvent(p_185313_, p_185314_, p_185315_);
            chunkgenerationevent.begin();
            return p_374911_ -> chunkgenerationevent.commit();
        }
    }

    @Nullable
    @Override
    public ProfiledDuration onStructureGenerate(ChunkPos p_376237_, ResourceKey<Level> p_376556_, Holder<Structure> p_377441_) {
        if (!StructureGenerationEvent.TYPE.isEnabled()) {
            return null;
        } else {
            StructureGenerationEvent structuregenerationevent = new StructureGenerationEvent(p_376237_, p_377441_, p_376556_);
            structuregenerationevent.begin();
            return p_374909_ -> {
                structuregenerationevent.success = p_374909_;
                structuregenerationevent.commit();
            };
        }
    }
}