// Copyright 2015 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "mojo/common/strong_binding_set.h"

#include "base/message_loop/message_loop.h"
#include "mojo/common/test_interfaces.mojom.h"
#include "mojo/message_pump/message_pump_mojo.h"
#include "mojo/public/cpp/bindings/binding.h"
#include "mojo/public/cpp/bindings/interface_request.h"
#include "testing/gtest/include/gtest/gtest.h"

namespace mojo {
namespace common {
namespace {

class DummyImpl : public tests::Dummy {
 public:
  explicit DummyImpl(bool* deleted_flag) : deleted_flag_(deleted_flag) {}
  ~DummyImpl() override { *deleted_flag_ = true; }

  void Foo() override { call_count_++; }

  int call_count() const { return call_count_; }

 private:
  bool* deleted_flag_;
  int call_count_ = 0;

  DISALLOW_COPY_AND_ASSIGN(DummyImpl);
};

// Tests all of the functionality of StrongBindingSet.
TEST(StrongBindingSetTest, FullLifeCycle) {
  base::MessageLoop loop(MessagePumpMojo::Create());

  // Create 10 InterfacePtrs and DummyImpls.
  const size_t kNumObjects = 10;
  InterfacePtr<tests::Dummy> intrfc_ptrs[kNumObjects];
  DummyImpl* impls[kNumObjects];
  bool deleted_flags[kNumObjects] = {};

  // Create 10 message pipes, bind everything together, and add the
  // bindings to binding_set.
  StrongBindingSet<tests::Dummy> binding_set;
  EXPECT_EQ(0u, binding_set.size());
  for (size_t i = 0; i < kNumObjects; i++) {
    impls[i] = new DummyImpl(&deleted_flags[i]);
    binding_set.AddBinding(impls[i], GetProxy(&intrfc_ptrs[i]));
  }
  EXPECT_EQ(kNumObjects, binding_set.size());

  // Check that initially all call counts are zero.
  for (const auto& impl : impls) {
    EXPECT_EQ(0, impl->call_count());
  }

  // Invoke method foo() on all 10 InterfacePointers.
  for (InterfacePtr<tests::Dummy>& ptr : intrfc_ptrs) {
    ptr->Foo();
  }

  // Check that now all call counts are one.
  loop.RunUntilIdle();
  for (const auto& impl : impls) {
    EXPECT_EQ(1, impl->call_count());
  }

  // Close the first 5 message pipes and destroy the first five
  // InterfacePtrs.
  for (size_t i = 0; i < kNumObjects / 2; i++) {
    intrfc_ptrs[i].reset();
  }

  // Check that the set contains only five elements now.
  loop.RunUntilIdle();
  EXPECT_EQ(kNumObjects / 2, binding_set.size());

  // Check that the first 5 interfaces have all been deleted.
  for (size_t i = 0; i < kNumObjects; i++) {
    bool expected = (i < kNumObjects / 2);
    EXPECT_EQ(expected, deleted_flags[i]);
  }

  // Invoke method foo() on the second five InterfacePointers.
  for (size_t i = kNumObjects / 2; i < kNumObjects; i++) {
    intrfc_ptrs[i]->Foo();
  }
  loop.RunUntilIdle();

  // Check that now the second five counts are two.
  for (size_t i = kNumObjects / 2; i < kNumObjects; i++) {
    EXPECT_EQ(2, impls[i]->call_count());
  }

  // Invoke CloseAllBindings
  binding_set.CloseAllBindings();
  EXPECT_EQ(0u, binding_set.size());

  // Invoke method foo() on the second five InterfacePointers.
  for (size_t i = kNumObjects / 2; i < kNumObjects; i++) {
    intrfc_ptrs[i]->Foo();
  }
  loop.RunUntilIdle();

  // Check that all interfaces have all been deleted.
  for (size_t i = 0; i < kNumObjects; i++) {
    EXPECT_TRUE(deleted_flags[i]);
  }
}

}  // namespace
}  // namespace common
}  // namespace mojo