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.Typed;
import com.mojang.datafixers.schemas.Schema;
import com.mojang.datafixers.types.Type;
import com.mojang.datafixers.util.Pair;
import com.mojang.serialization.OptionalDynamic;
import java.util.Optional;
import java.util.Set;
import java.util.function.Predicate;
import net.minecraft.util.Util;
import net.minecraft.util.datafix.LegacyComponentDataFixUtils;
import net.minecraft.util.datafix.schemas.NamespacedSchema;

public class ItemStackCustomNameToOverrideComponentFix extends DataFix {
	private static final Set<String> MAP_NAMES = Set.of(
		"filled_map.buried_treasure",
		"filled_map.explorer_jungle",
		"filled_map.explorer_swamp",
		"filled_map.mansion",
		"filled_map.monument",
		"filled_map.trial_chambers",
		"filled_map.village_desert",
		"filled_map.village_plains",
		"filled_map.village_savanna",
		"filled_map.village_snowy",
		"filled_map.village_taiga"
	);

	public ItemStackCustomNameToOverrideComponentFix(final Schema outputSchema) {
		super(outputSchema, false);
	}

	@Override
	public final TypeRewriteRule makeRule() {
		Type<?> itemStackType = this.getInputSchema().getType(References.ITEM_STACK);
		OpticFinder<Pair<String, String>> idFinder = DSL.fieldFinder("id", DSL.named(References.ITEM_NAME.typeName(), NamespacedSchema.namespacedString()));
		OpticFinder<?> componentsFinder = itemStackType.findField("components");
		return this.fixTypeEverywhereTyped(
			"ItemStack custom_name to item_name component fix",
			itemStackType,
			input -> {
				Optional<Pair<String, String>> id = input.getOptional(idFinder);
				Optional<String> maybeId = id.map(Pair::getSecond);
				if (maybeId.filter(s -> s.equals("minecraft:white_banner")).isPresent()) {
					return input.updateTyped(componentsFinder, ItemStackCustomNameToOverrideComponentFix::fixBanner);
				} else {
					return maybeId.filter(s -> s.equals("minecraft:filled_map")).isPresent()
						? input.updateTyped(componentsFinder, ItemStackCustomNameToOverrideComponentFix::fixMap)
						: input;
				}
			}
		);
	}

	private static <T> Typed<T> fixMap(final Typed<T> value) {
		return fixCustomName(value, MAP_NAMES::contains);
	}

	private static <T> Typed<T> fixBanner(final Typed<T> value) {
		return fixCustomName(value, e -> e.equals("block.minecraft.ominous_banner"));
	}

	private static <T> Typed<T> fixCustomName(final Typed<T> typed, final Predicate<String> expectedTranslationKey) {
		return Util.writeAndReadTypedOrThrow(
			typed,
			typed.getType(),
			value -> {
				OptionalDynamic<?> customNameTag = value.get("minecraft:custom_name");
				Optional<String> hasCorrectTranslationKey = customNameTag.asString()
					.result()
					.flatMap(LegacyComponentDataFixUtils::extractTranslationString)
					.filter(expectedTranslationKey);
				return hasCorrectTranslationKey.isPresent() ? value.renameField("minecraft:custom_name", "minecraft:item_name") : value;
			}
		);
	}
}