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

import it.unimi.dsi.fastutil.longs.LongSet;
import it.unimi.dsi.fastutil.longs.LongSets;
import java.util.List;
import java.util.Locale;
import net.minecraft.client.Minecraft;
import net.minecraft.core.BlockPos;
import net.minecraft.core.Direction;
import net.minecraft.core.SectionPos;
import net.minecraft.resources.Identifier;
import net.minecraft.server.level.ServerLevel;
import net.minecraft.util.Mth;
import net.minecraft.world.entity.Entity;
import net.minecraft.world.level.ChunkPos;
import net.minecraft.world.level.Level;
import net.minecraft.world.level.chunk.LevelChunk;
import org.jspecify.annotations.Nullable;

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

	@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) {
			BlockPos feetPos = minecraft.getCameraEntity().blockPosition();
			ChunkPos chunkPos = ChunkPos.containing(feetPos);
			Direction direction = entity.getDirection();

			String faceString = switch (direction) {
				case NORTH -> "Towards negative Z";
				case SOUTH -> "Towards positive Z";
				case WEST -> "Towards negative X";
				case EAST -> "Towards positive X";
				default -> "Invalid";
			};
			LongSet chunks = (LongSet)(serverOrClientLevel instanceof ServerLevel serverLevel ? serverLevel.getForceLoadedChunks() : LongSets.EMPTY_SET);
			displayer.addToGroup(
				GROUP,
				List.of(
					String.format(
						Locale.ROOT, "XYZ: %.3f / %.5f / %.3f", minecraft.getCameraEntity().getX(), minecraft.getCameraEntity().getY(), minecraft.getCameraEntity().getZ()
					),
					String.format(Locale.ROOT, "Block: %d %d %d", feetPos.getX(), feetPos.getY(), feetPos.getZ()),
					String.format(
						Locale.ROOT,
						"Chunk: %d %d %d [%d %d in r.%d.%d.mca]",
						chunkPos.x(),
						SectionPos.blockToSectionCoord(feetPos.getY()),
						chunkPos.z(),
						chunkPos.getRegionLocalX(),
						chunkPos.getRegionLocalZ(),
						chunkPos.getRegionX(),
						chunkPos.getRegionZ()
					),
					String.format(Locale.ROOT, "Facing: %s (%s) (%.1f / %.1f)", direction, faceString, Mth.wrapDegrees(entity.getYRot()), Mth.wrapDegrees(entity.getXRot())),
					minecraft.level.dimension().identifier() + " FC: " + chunks.size()
				)
			);
		}
	}
}