package net.minecraft.client.gui.components.debug;

import java.util.List;
import net.minecraft.SharedConstants;
import net.minecraft.client.Minecraft;
import net.minecraft.core.BlockPos;
import net.minecraft.resources.Identifier;
import net.minecraft.world.entity.Entity;
import net.minecraft.world.level.Level;
import net.minecraft.world.level.LightLayer;
import net.minecraft.world.level.chunk.LevelChunk;
import net.minecraft.world.level.lighting.LevelLightEngine;
import org.jspecify.annotations.Nullable;

public class DebugEntryLight implements DebugScreenEntry {
	public static final Identifier GROUP = Identifier.withDefaultNamespace("light");

	@Override
	public void display(
		final DebugScreenDisplayer displayer,
		@Nullable final Level serverOrClientLevel,
		@Nullable final LevelChunk clientChunk,
		@Nullable final LevelChunk serverChunk
	) {
		Minecraft minecraft = Minecraft.getInstance();
		Entity entity = minecraft.getCameraEntity();
		if (entity != null && minecraft.level != null) {
			BlockPos feetPos = entity.blockPosition();
			int rawBrightness = minecraft.level.getChunkSource().getLightEngine().getRawBrightness(feetPos, 0);
			int sky = minecraft.level.getBrightness(LightLayer.SKY, feetPos);
			int block = minecraft.level.getBrightness(LightLayer.BLOCK, feetPos);
			String clientLight = "Client Light: " + rawBrightness + " (" + sky + " sky, " + block + " block)";
			if (SharedConstants.DEBUG_SHOW_SERVER_DEBUG_VALUES) {
				String serverLight;
				if (serverChunk != null) {
					LevelLightEngine lightEngine = serverChunk.getLevel().getLightEngine();
					serverLight = "Server Light: ("
						+ lightEngine.getLayerListener(LightLayer.SKY).getLightValue(feetPos)
						+ " sky, "
						+ lightEngine.getLayerListener(LightLayer.BLOCK).getLightValue(feetPos)
						+ " block)";
				} else {
					serverLight = "Server Light: (?? sky, ?? block)";
				}

				displayer.addToGroup(GROUP, List.of(clientLight, serverLight));
			} else {
				displayer.addToGroup(GROUP, clientLight);
			}
		}
	}
}