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

	@Override
	protected TypeRewriteRule makeRule() {
		Type<?> type = this.getInputSchema().getType(References.ITEM_STACK);
		OpticFinder<?> opticFinder = type.findField("tag");
		return TypeRewriteRule.seq(
			this.fixTypeEverywhereTyped(this.name + " (ItemStack)", type, typed -> typed.updateTyped(opticFinder, 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(Dynamic<?> name) {
		return DataFixUtils.orElse(name.asString().result().map(this.renames).map(name::createString), name);
	}

	private Typed<?> fixItemStackTag(Typed<?> itemStackTag) {
		return itemStackTag.update(
			DSL.remainderFinder(),
			dynamic -> dynamic.update(
				"AttributeModifiers",
				dynamicx -> DataFixUtils.orElse(
					dynamicx.asStreamOpt().result().map(stream -> stream.map(dynamicxx -> dynamicxx.update("AttributeName", this::fixName))).map(dynamicx::createList),
					dynamicx
				)
			)
		);
	}

	private Typed<?> fixEntity(Typed<?> entityTag) {
		return entityTag.update(
			DSL.remainderFinder(),
			dynamic -> dynamic.update(
				"Attributes",
				dynamicx -> DataFixUtils.orElse(
					dynamicx.asStreamOpt().result().map(stream -> stream.map(dynamicxx -> dynamicxx.update("Name", this::fixName))).map(dynamicx::createList), dynamicx
				)
			)
		);
	}
}