package net.minecraft.util.datafix.fixes;

import com.mojang.datafixers.DSL;
import com.mojang.datafixers.DataFix;
import com.mojang.datafixers.OpticFinder;
import com.mojang.datafixers.TypeRewriteRule;
import com.mojang.datafixers.schemas.Schema;
import com.mojang.datafixers.types.Type;
import com.mojang.serialization.Dynamic;
import java.util.Optional;

public class HeightmapRenamingFix extends DataFix {
	public HeightmapRenamingFix(final Schema outputSchema, final boolean changesType) {
		super(outputSchema, changesType);
	}

	@Override
	protected TypeRewriteRule makeRule() {
		Type<?> inputType = this.getInputSchema().getType(References.CHUNK);
		OpticFinder<?> levelF = inputType.findField("Level");
		return this.fixTypeEverywhereTyped(
			"HeightmapRenamingFix", inputType, input -> input.updateTyped(levelF, level -> level.update(DSL.remainderFinder(), this::fix))
		);
	}

	private Dynamic<?> fix(final Dynamic<?> tag) {
		Optional<? extends Dynamic<?>> heightmaps = tag.get("Heightmaps").result();
		if (heightmaps.isEmpty()) {
			return tag;
		} else {
			Dynamic<?> heightmapsTag = (Dynamic<?>)heightmaps.get();
			Optional<? extends Dynamic<?>> liquid = heightmapsTag.get("LIQUID").result();
			if (liquid.isPresent()) {
				heightmapsTag = heightmapsTag.remove("LIQUID");
				heightmapsTag = heightmapsTag.set("WORLD_SURFACE_WG", (Dynamic<?>)liquid.get());
			}

			Optional<? extends Dynamic<?>> solid = heightmapsTag.get("SOLID").result();
			if (solid.isPresent()) {
				heightmapsTag = heightmapsTag.remove("SOLID");
				heightmapsTag = heightmapsTag.set("OCEAN_FLOOR_WG", (Dynamic<?>)solid.get());
				heightmapsTag = heightmapsTag.set("OCEAN_FLOOR", (Dynamic<?>)solid.get());
			}

			Optional<? extends Dynamic<?>> light = heightmapsTag.get("LIGHT").result();
			if (light.isPresent()) {
				heightmapsTag = heightmapsTag.remove("LIGHT");
				heightmapsTag = heightmapsTag.set("LIGHT_BLOCKING", (Dynamic<?>)light.get());
			}

			Optional<? extends Dynamic<?>> rain = heightmapsTag.get("RAIN").result();
			if (rain.isPresent()) {
				heightmapsTag = heightmapsTag.remove("RAIN");
				heightmapsTag = heightmapsTag.set("MOTION_BLOCKING", (Dynamic<?>)rain.get());
				heightmapsTag = heightmapsTag.set("MOTION_BLOCKING_NO_LEAVES", (Dynamic<?>)rain.get());
			}

			return tag.set("Heightmaps", heightmapsTag);
		}
	}
}