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.Dynamic;
import java.util.Optional;
import java.util.Set;
import net.minecraft.util.datafix.schemas.NamespacedSchema;

public class EffectDurationFix extends DataFix {
	private static final Set<String> POTION_ITEMS = Set.of("minecraft:potion", "minecraft:splash_potion", "minecraft:lingering_potion", "minecraft:tipped_arrow");

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

	@Override
	protected TypeRewriteRule makeRule() {
		Schema inputSchema = this.getInputSchema();
		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<?> tagFinder = itemStackType.findField("tag");
		return TypeRewriteRule.seq(
			this.fixTypeEverywhereTyped("EffectDurationEntity", inputSchema.getType(References.ENTITY), input -> input.update(DSL.remainderFinder(), this::updateEntity)),
			this.fixTypeEverywhereTyped("EffectDurationPlayer", inputSchema.getType(References.PLAYER), input -> input.update(DSL.remainderFinder(), this::updateEntity)),
			this.fixTypeEverywhereTyped("EffectDurationItem", itemStackType, input -> {
				if (input.getOptional(idFinder).filter(typeAndIdPair -> POTION_ITEMS.contains(typeAndIdPair.getSecond())).isPresent()) {
					Optional<? extends Typed<?>> tag = input.getOptionalTyped(tagFinder);
					if (tag.isPresent()) {
						Dynamic<?> tagRest = ((Typed)tag.get()).get(DSL.remainderFinder());
						Typed<?> newTag = ((Typed)tag.get()).set(DSL.remainderFinder(), tagRest.update("CustomPotionEffects", this::fix));
						return input.set(tagFinder, newTag);
					}
				}

				return input;
			})
		);
	}

	private Dynamic<?> fixEffect(final Dynamic<?> effect) {
		return effect.update("FactorCalculationData", factorData -> {
			int timestamp = factorData.get("effect_changed_timestamp").asInt(-1);
			factorData = factorData.remove("effect_changed_timestamp");
			int duration = effect.get("Duration").asInt(-1);
			int ticksActive = timestamp - duration;
			return factorData.set("ticks_active", factorData.createInt(ticksActive));
		});
	}

	private Dynamic<?> fix(final Dynamic<?> input) {
		return input.createList(input.asStream().map(this::fixEffect));
	}

	private Dynamic<?> updateEntity(Dynamic<?> data) {
		data = data.update("Effects", this::fix);
		data = data.update("ActiveEffects", this::fix);
		return data.update("CustomPotionEffects", this::fix);
	}
}