package net.minecraft.util.datafix.fixes;

import com.mojang.datafixers.DSL;
import com.mojang.datafixers.DataFix;
import com.mojang.datafixers.DataFixUtils;
import com.mojang.datafixers.OpticFinder;
import com.mojang.datafixers.TypeRewriteRule;
import com.mojang.datafixers.Typed;
import com.mojang.datafixers.schemas.Schema;
import com.mojang.datafixers.types.Type;
import com.mojang.serialization.Dynamic;
import java.util.function.UnaryOperator;

public class AttributesRenameLegacy extends DataFix {
	private final String name;
	private final UnaryOperator<String> renames;

	public AttributesRenameLegacy(final Schema outputSchema, final String name, final UnaryOperator<String> renames) {
		super(outputSchema, false);
		this.name = name;
		this.renames = renames;
	}

	@Override
	protected TypeRewriteRule makeRule() {
		Type<?> itemStackType = this.getInputSchema().getType(References.ITEM_STACK);
		OpticFinder<?> tagF = itemStackType.findField("tag");
		return TypeRewriteRule.seq(
			this.fixTypeEverywhereTyped(this.name + " (ItemStack)", itemStackType, itemStack -> itemStack.updateTyped(tagF, this::fixItemStackTag)),
			this.fixTypeEverywhereTyped(this.name + " (Entity)", this.getInputSchema().getType(References.ENTITY), this::fixEntity),
			this.fixTypeEverywhereTyped(this.name + " (Player)", this.getInputSchema().getType(References.PLAYER), this::fixEntity)
		);
	}

	private Dynamic<?> fixName(final Dynamic<?> name) {
		return DataFixUtils.orElse(name.asString().result().map(this.renames).map(name::createString), name);
	}

	private Typed<?> fixItemStackTag(final Typed<?> itemStack) {
		return itemStack.update(
			DSL.remainderFinder(),
			tag -> tag.update(
				"AttributeModifiers",
				modifiers -> DataFixUtils.orElse(
					modifiers.asStreamOpt().result().map(s -> s.map(modifier -> modifier.update("AttributeName", this::fixName))).map(modifiers::createList), modifiers
				)
			)
		);
	}

	private Typed<?> fixEntity(final Typed<?> entity) {
		return entity.update(
			DSL.remainderFinder(),
			tag -> tag.update(
				"Attributes",
				attributeList -> DataFixUtils.orElse(
					attributeList.asStreamOpt().result().map(s -> s.map(attribute -> attribute.update("Name", this::fixName))).map(attributeList::createList), attributeList
				)
			)
		);
	}
}