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 {
	final String name;
	final Map<String, String> renames;

	public RenameEnchantmentsFix(Schema outputSchema, String name, Map<String, 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 this.fixTypeEverywhereTyped(this.name, type, typed -> typed.updateTyped(opticFinder, typedx -> typedx.update(DSL.remainderFinder(), this::fixTag)));
	}

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

	private Dynamic<?> fixEnchantmentList(Dynamic<?> tag, String key) {
		return tag.update(
			key,
			dynamic -> dynamic.asStreamOpt()
				.map(
					stream -> stream.map(
						dynamicx -> dynamicx.update(
							"id",
							dynamic2 -> dynamic2.asString()
								.map(string -> dynamicx.createString((String)this.renames.getOrDefault(NamespacedSchema.ensureNamespaced(string), string)))
								.mapOrElse(Function.identity(), error -> dynamic2)
						)
					)
				)
				.map(dynamic::createList)
				.mapOrElse(Function.identity(), error -> dynamic)
		);
	}
}