package inference.bug8;

import java.io.Serializable;
import java.util.Map;
import java.util.function.Function;
import java.util.stream.Collector;

@SuppressWarnings("") // Just check for crashes.
public class Bug8 {

    static <T1, K1, V1> Collector<T1, ?, MyMap<K1, V1>> toImmutableMap(
            Function<? super T1, ? extends K1> keyFunction,
            Function<? super T1, ? extends V1> valueFunction) {
        return Collector.of(
                MyMap.Builder<K1, V1>::new,
                (builder, input) ->
                        builder.put(keyFunction.apply(input), valueFunction.apply(input)),
                MyMap.Builder::combine,
                MyMap.Builder::build);
    }

    static <T, K, V> Collector<T, ?, MyBiMap<K, V>> toImmutableBiMap(
            Function<? super T, ? extends K> keyFunction,
            Function<? super T, ? extends V> valueFunction) {
        return Collector.of(
                MyBiMap.Builder<K, V>::new,
                (builder, input) ->
                        builder.put(keyFunction.apply(input), valueFunction.apply(input)),
                MyBiMap.Builder::combine,
                MyBiMap.Builder::build,
                new Collector.Characteristics[0]);
    }

    abstract static class ShimMap<K, V> extends MyMap<K, V> {}

    public interface BiMap<K, V> extends Map<K, V> {}

    public abstract static class MyBiMap<K, V> extends ShimMap<K, V> implements BiMap<K, V> {
        public static final class Builder<K, V> extends MyMap.Builder<K, V> {
            public Builder() {}

            @Override
            public MyBiMap.Builder<K, V> put(K key, V value) {
                throw new RuntimeException();
            }

            @Override
            MyBiMap.Builder<K, V> combine(MyMap.Builder<K, V> builder) {
                super.combine(builder);
                return this;
            }

            @Override
            public MyBiMap<K, V> build() {
                throw new RuntimeException();
            }
        }
    }

    public abstract static class MyMap<K, V> implements Map<K, V>, Serializable {
        public static class Builder<K, V> {
            public Builder() {}

            public MyMap.Builder<K, V> put(K key, V value) {
                throw new RuntimeException();
            }

            MyMap.Builder<K, V> combine(MyMap.Builder<K, V> other) {
                throw new RuntimeException();
            }

            public MyMap<K, V> build() {
                throw new RuntimeException();
            }
        }
    }
}