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.datafixers.types.templates.TaggedChoice.TaggedChoiceType;
import com.mojang.datafixers.util.Pair;
import java.util.Locale;
import java.util.Objects;
import net.minecraft.util.datafix.schemas.NamespacedSchema;

public abstract class SimplestEntityRenameFix extends DataFix {
	private final String name;

	public SimplestEntityRenameFix(final String name, final Schema outputSchema, final boolean changesType) {
		super(outputSchema, changesType);
		this.name = name;
	}

	@Override
	public TypeRewriteRule makeRule() {
		TaggedChoiceType<String> oldType = (TaggedChoiceType<String>)this.getInputSchema().findChoiceType(References.ENTITY);
		TaggedChoiceType<String> newType = (TaggedChoiceType<String>)this.getOutputSchema().findChoiceType(References.ENTITY);
		Type<Pair<String, String>> entityNameType = DSL.named(References.ENTITY_NAME.typeName(), NamespacedSchema.namespacedString());
		if (!Objects.equals(this.getOutputSchema().getType(References.ENTITY_NAME), entityNameType)) {
			throw new IllegalStateException("Entity name type is not what was expected.");
		} else {
			return TypeRewriteRule.seq(this.fixTypeEverywhere(this.name, oldType, newType, ops -> input -> input.mapFirst(oldName -> {
				String newName = this.rename(oldName);
				Type<?> oldEntityType = (Type<?>)oldType.types().get(oldName);
				Type<?> newEntityType = (Type<?>)newType.types().get(newName);
				if (!newEntityType.equals(oldEntityType, true, true)) {
					throw new IllegalStateException(String.format(Locale.ROOT, "Dynamic type check failed: %s not equal to %s", newEntityType, oldEntityType));
				} else {
					return newName;
				}
			})), this.fixTypeEverywhere(this.name + " for entity name", entityNameType, ops -> input -> input.mapSecond(this::rename)));
		}
	}

	protected abstract String rename(final String name);
}