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 * in the documentation and/or other materials provided with the
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#include "third_party/blink/renderer/core/execution_context/execution_context_lifecycle_state_observer.h"

#include <memory>
#include "testing/gmock/include/gmock/gmock.h"
#include "testing/gtest/include/gtest/gtest.h"
#include "third_party/blink/renderer/core/frame/local_dom_window.h"
#include "third_party/blink/renderer/core/testing/dummy_page_holder.h"

using testing::AnyNumber;

namespace blink {

class MockExecutionContextLifecycleStateObserver final
    : public GarbageCollected<MockExecutionContextLifecycleStateObserver>,
      public ExecutionContextLifecycleStateObserver {
 public:
  explicit MockExecutionContextLifecycleStateObserver(ExecutionContext* context)
      : ExecutionContextLifecycleStateObserver(context) {}

  void Trace(Visitor* visitor) const override {
    ExecutionContextLifecycleStateObserver::Trace(visitor);
  }

  MOCK_METHOD1(ContextLifecycleStateChanged, void(mojom::FrameLifecycleState));
  MOCK_METHOD0(ContextDestroyed, void());
};

class ExecutionContextLifecycleStateObserverTest : public testing::Test {
 protected:
  ExecutionContextLifecycleStateObserverTest();

  LocalDOMWindow* SrcWindow() const {
    return src_page_holder_->GetFrame().DomWindow();
  }
  LocalDOMWindow* DestWindow() const {
    return dest_page_holder_->GetFrame().DomWindow();
  }

  void ClearDestPage() { dest_page_holder_.reset(); }
  MockExecutionContextLifecycleStateObserver& Observer() { return *observer_; }

 private:
  std::unique_ptr<DummyPageHolder> src_page_holder_;
  std::unique_ptr<DummyPageHolder> dest_page_holder_;
  Persistent<MockExecutionContextLifecycleStateObserver> observer_;
};

ExecutionContextLifecycleStateObserverTest::
    ExecutionContextLifecycleStateObserverTest()
    : src_page_holder_(std::make_unique<DummyPageHolder>(IntSize(800, 600))),
      dest_page_holder_(std::make_unique<DummyPageHolder>(IntSize(800, 600))),
      observer_(
          MakeGarbageCollected<MockExecutionContextLifecycleStateObserver>(
              src_page_holder_->GetFrame().DomWindow())) {
  observer_->UpdateStateIfNeeded();
}

TEST_F(ExecutionContextLifecycleStateObserverTest, NewContextObserved) {
  unsigned initial_src_count =
      SrcWindow()->ContextLifecycleStateObserverCountForTesting();
  unsigned initial_dest_count =
      DestWindow()->ContextLifecycleStateObserverCountForTesting();

  EXPECT_CALL(Observer(), ContextLifecycleStateChanged(
                              mojom::FrameLifecycleState::kRunning));
  EXPECT_CALL(Observer(), ContextDestroyed()).Times(AnyNumber());
  Observer().SetExecutionContext(DestWindow());

  EXPECT_EQ(initial_src_count - 1,
            SrcWindow()->ContextLifecycleStateObserverCountForTesting());
  EXPECT_EQ(initial_dest_count + 1,
            DestWindow()->ContextLifecycleStateObserverCountForTesting());
}

TEST_F(ExecutionContextLifecycleStateObserverTest, MoveToActiveContext) {
  EXPECT_CALL(Observer(), ContextLifecycleStateChanged(
                              mojom::FrameLifecycleState::kRunning));
  EXPECT_CALL(Observer(), ContextDestroyed()).Times(AnyNumber());
  Observer().SetExecutionContext(DestWindow());
}

TEST_F(ExecutionContextLifecycleStateObserverTest, MoveToSuspendedContext) {
  DestWindow()->SetLifecycleState(mojom::FrameLifecycleState::kFrozen);

  EXPECT_CALL(Observer(), ContextLifecycleStateChanged(
                              mojom::FrameLifecycleState::kFrozen));
  EXPECT_CALL(Observer(), ContextDestroyed()).Times(AnyNumber());
  Observer().SetExecutionContext(DestWindow());
}

TEST_F(ExecutionContextLifecycleStateObserverTest, MoveToStoppedContext) {
  Persistent<LocalDOMWindow> window = DestWindow();
  ClearDestPage();
  EXPECT_CALL(Observer(), ContextDestroyed());
  Observer().SetExecutionContext(window.Get());
}

}  // namespace blink