package net.minecraft.util.datafix.fixes;

import com.google.common.collect.ImmutableList;
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.datafixers.util.Either;
import com.mojang.datafixers.util.Pair;
import com.mojang.datafixers.util.Unit;
import java.util.List;
import java.util.Objects;
import java.util.Optional;

public class EntityRidingToPassengersFix extends DataFix {
	public EntityRidingToPassengersFix(Schema outputSchema, boolean changesType) {
		super(outputSchema, changesType);
	}

	@Override
	public TypeRewriteRule makeRule() {
		Schema schema = this.getInputSchema();
		Schema schema2 = this.getOutputSchema();
		Type<?> type = schema.getTypeRaw(References.ENTITY_TREE);
		Type<?> type2 = schema2.getTypeRaw(References.ENTITY_TREE);
		Type<?> type3 = schema.getTypeRaw(References.ENTITY);
		return this.cap(schema, schema2, type, type2, type3);
	}

	private <OldEntityTree, NewEntityTree, Entity> TypeRewriteRule cap(
		Schema inputSchema, Schema outputSchema, Type<OldEntityTree> oldEntityTreeType, Type<NewEntityTree> newEntityTreeType, Type<Entity> entityType
	) {
		Type<Pair<String, Pair<Either<OldEntityTree, Unit>, Entity>>> type = DSL.named(
			References.ENTITY_TREE.typeName(), DSL.and(DSL.optional(DSL.field("Riding", oldEntityTreeType)), entityType)
		);
		Type<Pair<String, Pair<Either<List<NewEntityTree>, Unit>, Entity>>> type2 = DSL.named(
			References.ENTITY_TREE.typeName(), DSL.and(DSL.optional(DSL.field("Passengers", DSL.list(newEntityTreeType))), entityType)
		);
		Type<?> type3 = inputSchema.getType(References.ENTITY_TREE);
		Type<?> type4 = outputSchema.getType(References.ENTITY_TREE);
		if (!Objects.equals(type3, type)) {
			throw new IllegalStateException("Old entity type is not what was expected.");
		} else if (!type4.equals(type2, true, true)) {
			throw new IllegalStateException("New entity type is not what was expected.");
		} else {
			OpticFinder<Pair<String, Pair<Either<OldEntityTree, Unit>, Entity>>> opticFinder = DSL.typeFinder(type);
			OpticFinder<Pair<String, Pair<Either<List<NewEntityTree>, Unit>, Entity>>> opticFinder2 = DSL.typeFinder(type2);
			OpticFinder<NewEntityTree> opticFinder3 = DSL.typeFinder(newEntityTreeType);
			Type<?> type5 = inputSchema.getType(References.PLAYER);
			Type<?> type6 = outputSchema.getType(References.PLAYER);
			return TypeRewriteRule.seq(
				this.fixTypeEverywhere(
					"EntityRidingToPassengerFix",
					type,
					type2,
					dynamicOps -> pair -> {
						Optional<Pair<String, Pair<Either<List<NewEntityTree>, Unit>, Entity>>> optional = Optional.empty();
						Pair<String, Pair<Either<OldEntityTree, Unit>, Entity>> pair2 = pair;

						while (true) {
							Either<List<NewEntityTree>, Unit> either = DataFixUtils.orElse(
								optional.map(
									pairx -> {
										Typed<NewEntityTree> typed = (Typed<NewEntityTree>)newEntityTreeType.pointTyped(dynamicOps)
											.orElseThrow(() -> new IllegalStateException("Could not create new entity tree"));
										NewEntityTree object = (NewEntityTree)typed.set(opticFinder2, pairx)
											.getOptional(opticFinder3)
											.orElseThrow(() -> new IllegalStateException("Should always have an entity tree here"));
										return Either.left(ImmutableList.of(object));
									}
								),
								Either.right(DSL.unit())
							);
							optional = Optional.of(Pair.of(References.ENTITY_TREE.typeName(), Pair.of(either, pair2.getSecond().getSecond())));
							Optional<OldEntityTree> optional2 = pair2.getSecond().getFirst().left();
							if (optional2.isEmpty()) {
								return (Pair)optional.orElseThrow(() -> new IllegalStateException("Should always have an entity tree here"));
							}

							pair2 = (Pair<String, Pair<Either<OldEntityTree, Unit>, Entity>>)new Typed<>(oldEntityTreeType, dynamicOps, (OldEntityTree)optional2.get())
								.getOptional(opticFinder)
								.orElseThrow(() -> new IllegalStateException("Should always have an entity here"));
						}
					}
				),
				this.writeAndRead("player RootVehicle injecter", type5, type6)
			);
		}
	}
}