// Copyright (c) 2020, the R8 project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.

package com.android.tools.r8.utils.collections;

import com.android.tools.r8.graph.ProgramMember;
import com.google.common.base.Equivalence.Wrapper;
import java.util.Map;
import java.util.function.BiConsumer;
import java.util.function.BiFunction;
import java.util.function.BiPredicate;
import java.util.function.Function;
import java.util.function.Supplier;

public abstract class ProgramMemberMap<K extends ProgramMember<?, ?>, V> {

  private final Map<Wrapper<K>, V> backing;

  ProgramMemberMap(Supplier<Map<Wrapper<K>, V>> backingFactory) {
    this.backing = backingFactory.get();
  }

  ProgramMemberMap(Map<Wrapper<K>, V> backing) {
    this.backing = backing;
  }

  public void clear() {
    backing.clear();
  }

  public V compute(K member, BiFunction<K, V, V> fn) {
    return backing.compute(wrap(member), (key, value) -> fn.apply(member, value));
  }

  public V computeIfAbsent(K member, Function<K, V> fn) {
    return backing.computeIfAbsent(wrap(member), key -> fn.apply(key.get()));
  }

  public boolean containsKey(K member) {
    return backing.containsKey(wrap(member));
  }

  public void forEach(BiConsumer<K, V> consumer) {
    backing.forEach((wrapper, value) -> consumer.accept(wrapper.get(), value));
  }

  public V get(K member) {
    return backing.get(wrap(member));
  }

  public V getOrDefault(K member, V defaultValue) {
    return backing.getOrDefault(wrap(member), defaultValue);
  }

  public V getOrDefault(K member, Supplier<V> defaultValue) {
    V value = backing.get(wrap(member));
    return value != null ? value : defaultValue.get();
  }

  public boolean isEmpty() {
    return backing.isEmpty();
  }

  public V put(K member, V value) {
    Wrapper<K> wrapper = wrap(member);
    return backing.put(wrapper, value);
  }

  public V remove(K member) {
    return backing.remove(wrap(member));
  }

  public void removeIf(BiPredicate<K, V> predicate) {
    backing.entrySet().removeIf(entry -> predicate.test(entry.getKey().get(), entry.getValue()));
  }

  abstract Wrapper<K> wrap(K member);
}