package dev.modzuozhi;

import net.neoforged.bus.api.SubscribeEvent;
import net.neoforged.fml.common.EventBusSubscriber;
import net.neoforged.neoforge.event.tick.ServerTickEvent;
import net.minecraft.world.level.chunk.status.ChunkStatus;
import dev.modzuozhi.core.dimthread.FineGrainScheduler;
import dev.modzuozhi.core.dimthread.DimThreadCore;
import net.minecraft.server.level.ServerPlayer;
import net.minecraft.server.level.ClientInformation;
import com.mojang.authlib.GameProfile;
import java.util.UUID;

/** Runtime regression fixture; deliberately outside production source sets. */
@EventBusSubscriber(modid = "dimensionalripper")
public final class ChunkHandoffRegression {
    private static int rounds;
    @SubscribeEvent
    public static void tick(ServerTickEvent.Post event) {
        var server = event.getServer();
        if (server.getTickCount() < 10) return;
        if (rounds % 10 == 0) {
            DimThreadCore.MANAGER.setPaused(server, true);
            if (DimThreadCore.MANAGER.isLoopScheduled(server.overworld()))
                throw new AssertionError("Paused idle loop still owns chunk queue");
            // Exercise the actual login constructor from the reported waiting stack.
            new ServerPlayer(server, server.overworld(), new GameProfile(UUID.randomUUID(), "PauseRegression"),
                    ClientInformation.createDefault());
            server.overworld().getChunkSource().getChunk(20 + rounds, 0, ChunkStatus.FULL, true);
            DimThreadCore.MANAGER.setPaused(server, false);
        }
        for (int i = 0; i < 100; i++) {
            if (server.overworld().getChunkSource().getChunk(0, 0, ChunkStatus.FULL, true) == null)
                throw new AssertionError("Missing requested chunk");
        }
        if (++rounds == 100) {
            if (!FineGrainScheduler.isEnabled()) throw new AssertionError("Test silently degraded");
            ModZuozhi.LOGGER.info("REGRESSION PASS: 10 paused login constructors, paused generation, resume, 10000 running chunk requests; fine enabled");
            server.halt(false);
        }
    }
}