package net.minecraft.util.datafix.fixes;

import com.mojang.datafixers.DSL;
import com.mojang.datafixers.DataFix;
import com.mojang.datafixers.OpticFinder;
import com.mojang.datafixers.TypeRewriteRule;
import com.mojang.datafixers.schemas.Schema;
import com.mojang.datafixers.types.Type;
import com.mojang.serialization.Dynamic;
import java.util.Map;
import java.util.function.Function;
import net.minecraft.util.datafix.schemas.NamespacedSchema;

public class RenameEnchantmentsFix extends DataFix {
	private final String name;
	private final Map<String, String> renames;

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

	@Override
	protected TypeRewriteRule makeRule() {
		Type<?> item = this.getInputSchema().getType(References.ITEM_STACK);
		OpticFinder<?> tagFinder = item.findField("tag");
		return this.fixTypeEverywhereTyped(this.name, item, input -> input.updateTyped(tagFinder, tag -> tag.update(DSL.remainderFinder(), this::fixTag)));
	}

	private Dynamic<?> fixTag(Dynamic<?> tag) {
		tag = this.fixEnchantmentList(tag, "Enchantments");
		return this.fixEnchantmentList(tag, "StoredEnchantments");
	}

	private Dynamic<?> fixEnchantmentList(final Dynamic<?> itemStack, final String field) {
		return itemStack.update(
			field,
			tag -> tag.asStreamOpt()
				.map(
					s -> s.map(
						element -> element.update(
							"id",
							id -> id.asString()
								.map(stringId -> element.createString((String)this.renames.getOrDefault(NamespacedSchema.ensureNamespaced(stringId), stringId)))
								.mapOrElse(Function.identity(), fail -> id)
						)
					)
				)
				.map(tag::createList)
				.mapOrElse(Function.identity(), fail -> tag)
		);
	}
}