package net.minecraft.util.datafix.fixes;

import com.mojang.datafixers.DSL;
import com.mojang.datafixers.DataFix;
import com.mojang.datafixers.TypeRewriteRule;
import com.mojang.datafixers.schemas.Schema;
import com.mojang.datafixers.types.Type;
import com.mojang.serialization.Dynamic;

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

	@Override
	protected TypeRewriteRule makeRule() {
		Type<?> structureInfo = this.getInputSchema().getType(References.STRUCTURE_FEATURE);
		return this.fixTypeEverywhereTyped(
			"Structure Reference Fix", structureInfo, input -> input.update(DSL.remainderFinder(), StructureReferenceCountFix::setCountToAtLeastOne)
		);
	}

	private static <T> Dynamic<T> setCountToAtLeastOne(final Dynamic<T> structureTag) {
		return structureTag.update(
			"references", references -> references.createInt((Integer)references.asNumber().map(Number::intValue).result().filter(number -> number > 0).orElse(1))
		);
	}
}