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.DSL.TypeReference;
import com.mojang.datafixers.schemas.Schema;
import com.mojang.datafixers.types.Type;
import com.mojang.datafixers.util.Pair;
import java.util.Objects;
import java.util.function.UnaryOperator;
import net.minecraft.util.datafix.schemas.NamespacedSchema;

public class NamespacedTypeRenameFix extends DataFix {
	private final String name;
	private final TypeReference type;
	private final UnaryOperator<String> renamer;

	public NamespacedTypeRenameFix(final Schema outputSchema, final String name, final TypeReference type, final UnaryOperator<String> renamer) {
		super(outputSchema, false);
		this.name = name;
		this.type = type;
		this.renamer = renamer;
	}

	@Override
	protected TypeRewriteRule makeRule() {
		Type<Pair<String, String>> fieldType = DSL.named(this.type.typeName(), NamespacedSchema.namespacedString());
		if (!Objects.equals(fieldType, this.getInputSchema().getType(this.type))) {
			throw new IllegalStateException("\"" + this.type.typeName() + "\" is not what was expected.");
		} else {
			return this.fixTypeEverywhere(this.name, fieldType, ops -> input -> input.mapSecond(this.renamer));
		}
	}
}