/*
 * Copyright 2015-present Facebook, Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include <folly/io/async/EventBaseLocal.h>
#include <folly/portability/GTest.h>

struct Foo {
  Foo(int n_, std::function<void()> dtorFn_)
      : n(n_), dtorFn(std::move(dtorFn_)) {}
  ~Foo() {
    dtorFn();
  }

  int n;
  std::function<void()> dtorFn;
};

TEST(EventBaseLocalTest, Basic) {
  int dtorCnt = 0;
  folly::EventBase evb1;

  {
    folly::EventBaseLocal<Foo> foo;

    EXPECT_EQ(foo.get(evb1), nullptr);

    foo.emplace(evb1, new Foo(5, [&]() { ++dtorCnt; }));

    EXPECT_EQ(foo.get(evb1)->n, 5);

    {
      folly::EventBase evb2;
      foo.emplace(evb2, new Foo(6, [&]() { ++dtorCnt; }));
      EXPECT_EQ(foo.get(evb2)->n, 6);
      foo.erase(evb2);
      EXPECT_EQ(dtorCnt, 1); // should dtor a Foo when we erase
      EXPECT_EQ(foo.get(evb2), nullptr);
      foo.emplace(evb2, 7, [&]() { ++dtorCnt; });
      EXPECT_EQ(foo.get(evb2)->n, 7);
    }

    EXPECT_EQ(dtorCnt, 2); // should dtor a Foo when evb2 destructs
  }
  EXPECT_EQ(dtorCnt, 2); // should schedule Foo destructor, when foo destructs
  evb1.loop();
  EXPECT_EQ(dtorCnt, 3); // Foo will be destroyed in EventBase loop
}

TEST(EventBaseLocalTest, getOrCreate) {
  folly::EventBase evb1;
  folly::EventBaseLocal<int> ints;

  EXPECT_EQ(ints.getOrCreate(evb1), 0);
  EXPECT_EQ(ints.getOrCreate(evb1, 5), 0);

  folly::EventBase evb2;
  EXPECT_EQ(ints.getOrCreate(evb2, 5), 5);
  ints.erase(evb2);
  auto creator = []() { return new int(4); };
  EXPECT_EQ(ints.getOrCreateFn(evb2, creator), 4);
}

using IntPtr = std::unique_ptr<int>;

TEST(EventBaseLocalTest, getOrCreateNoncopyable) {
  folly::EventBase evb1;
  folly::EventBaseLocal<IntPtr> ints;

  EXPECT_EQ(ints.getOrCreate(evb1), IntPtr());
  EXPECT_EQ(ints.getOrCreate(evb1, std::make_unique<int>(5)), IntPtr());

  folly::EventBase evb2;
  EXPECT_EQ(*ints.getOrCreate(evb2, std::make_unique<int>(5)), 5);
}

TEST(EventBaseLocalTest, emplaceNoncopyable) {
  folly::EventBase evb;
  folly::EventBaseLocal<IntPtr> ints;
  ints.emplace(evb, std::make_unique<int>(42));
  EXPECT_EQ(42, **ints.get(evb));
}