/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "nsIFactory.h"
#include "nsXULAppAPI.h"
#include "nsIThread.h"

#include "nsComponentManager.h"
#include "nsServiceManagerUtils.h"
#include "nsThreadUtils.h"
#include "nsXPCOMCIDInternal.h"
#include "pratom.h"
#include "prmon.h"
#include "mozilla/Assertions.h"
#include "mozilla/gtest/MozAssertions.h"

#include "mozilla/ReentrantMonitor.h"

#include "gtest/gtest.h"

using namespace mozilla;

/* f93f6bdc-88af-42d7-9d64-1b43c649a3e5 */
#define FACTORY_CID1 \
  {0xf93f6bdc, 0x88af, 0x42d7, {0x9d, 0x64, 0x1b, 0x43, 0xc6, 0x49, 0xa3, 0xe5}}
NS_DEFINE_CID(kFactoryCID1, FACTORY_CID1);

/* ef38ad65-6595-49f0-8048-e819f81d15e2 */
#define FACTORY_CID2 \
  {0xef38ad65, 0x6595, 0x49f0, {0x80, 0x48, 0xe8, 0x19, 0xf8, 0x1d, 0x15, 0xe2}}
NS_DEFINE_CID(kFactoryCID2, FACTORY_CID2);

#define FACTORY_CONTRACTID "TestRacingThreadManager/factory;1"

namespace TestRacingServiceManager {
int32_t gComponent1Count = 0;
int32_t gComponent2Count = 0;

ReentrantMonitor* gReentrantMonitor = nullptr;

bool gCreateInstanceCalled = false;
bool gMainThreadWaiting = false;

class AutoCreateAndDestroyReentrantMonitor {
 public:
  explicit AutoCreateAndDestroyReentrantMonitor(
      ReentrantMonitor** aReentrantMonitorPtr)
      : mReentrantMonitorPtr(aReentrantMonitorPtr) {
    *aReentrantMonitorPtr =
        new ReentrantMonitor("TestRacingServiceManager::AutoMon");
    MOZ_RELEASE_ASSERT(*aReentrantMonitorPtr, "Out of memory!");
  }

  ~AutoCreateAndDestroyReentrantMonitor() {
    if (*mReentrantMonitorPtr) {
      delete *mReentrantMonitorPtr;
      *mReentrantMonitorPtr = nullptr;
    }
  }

 private:
  ReentrantMonitor** mReentrantMonitorPtr;
};

class Factory final : public nsIFactory {
  ~Factory() = default;

 public:
  NS_DECL_THREADSAFE_ISUPPORTS

  Factory() : mFirstComponentCreated(false) {}

  NS_IMETHOD CreateInstance(const nsIID& aIID, void** aResult) override;

  bool mFirstComponentCreated;
};

NS_IMPL_ISUPPORTS(Factory, nsIFactory)

class Component1 final : public nsISupports {
  ~Component1() = default;

 public:
  NS_DECL_THREADSAFE_ISUPPORTS

  Component1() {
    // This is the real test - make sure that only one instance is ever created.
    int32_t count = PR_AtomicIncrement(&gComponent1Count);
    MOZ_RELEASE_ASSERT(count == 1, "Too many components created!");
  }
};

NS_IMPL_ADDREF(Component1)
NS_IMPL_RELEASE(Component1)

NS_INTERFACE_MAP_BEGIN(Component1)
  NS_INTERFACE_MAP_ENTRY(nsISupports)
NS_INTERFACE_MAP_END

class Component2 final : public nsISupports {
  ~Component2() = default;

 public:
  NS_DECL_THREADSAFE_ISUPPORTS

  Component2() {
    // This is the real test - make sure that only one instance is ever created.
    int32_t count = PR_AtomicIncrement(&gComponent2Count);
    EXPECT_EQ(count, int32_t(1)) << "Too many components created!";
  }
};

NS_IMPL_ADDREF(Component2)
NS_IMPL_RELEASE(Component2)

NS_INTERFACE_MAP_BEGIN(Component2)
  NS_INTERFACE_MAP_ENTRY(nsISupports)
NS_INTERFACE_MAP_END

NS_IMETHODIMP
Factory::CreateInstance(const nsIID& aIID, void** aResult) {
  // Make sure that the second thread beat the main thread to the getService
  // call.
  MOZ_RELEASE_ASSERT(!NS_IsMainThread(), "Wrong thread!");

  {
    ReentrantMonitorAutoEnter mon(*gReentrantMonitor);

    gCreateInstanceCalled = true;
    mon.Notify();

    mon.Wait(PR_MillisecondsToInterval(3000));
  }

  NS_ENSURE_ARG_POINTER(aResult);

  nsCOMPtr<nsISupports> instance;

  if (!mFirstComponentCreated) {
    instance = MakeRefPtr<Component1>();
  } else {
    instance = MakeRefPtr<Component2>();
  }
  NS_ENSURE_TRUE(instance, NS_ERROR_OUT_OF_MEMORY);

  nsresult rv = instance->QueryInterface(aIID, aResult);
  NS_ENSURE_SUCCESS(rv, rv);

  return NS_OK;
}

class TestRunnable : public Runnable {
 public:
  NS_DECL_NSIRUNNABLE

  TestRunnable()
      : mozilla::Runnable("TestRacingServiceManager::TestRunnable"),
        mFirstRunnableDone(false) {}

  bool mFirstRunnableDone;
};

NS_IMETHODIMP
TestRunnable::Run() {
  {
    ReentrantMonitorAutoEnter mon(*gReentrantMonitor);

    while (!gMainThreadWaiting) {
      mon.Wait();
    }
  }

  nsresult rv;
  nsCOMPtr<nsISupports> component;

  if (!mFirstRunnableDone) {
    component = do_GetService(kFactoryCID1, &rv);
  } else {
    component = do_GetService(FACTORY_CONTRACTID, &rv);
  }
  EXPECT_TRUE(NS_SUCCEEDED(rv)) << "GetService failed!";

  return NS_OK;
}

static Factory* gFactory;

TEST(RacingServiceManager, Test)
{
  nsresult rv;

  gFactory = new Factory();
  NS_ADDREF(gFactory);

  nsComponentManagerImpl::gComponentManager->RegisterFactory(
      kFactoryCID2, "factory1", FACTORY_CONTRACTID, gFactory);
  nsComponentManagerImpl::gComponentManager->RegisterFactory(
      kFactoryCID1, "factory2", nullptr, gFactory);

  AutoCreateAndDestroyReentrantMonitor mon1(&gReentrantMonitor);

  RefPtr runnable = MakeRefPtr<TestRunnable>();
  ASSERT_TRUE(runnable);

  // Run the classID test
  nsCOMPtr<nsIThread> newThread;
  rv = NS_NewNamedThread("RacingServMan", getter_AddRefs(newThread), runnable);
  ASSERT_NS_SUCCEEDED(rv);

  {
    ReentrantMonitorAutoEnter mon2(*gReentrantMonitor);

    gMainThreadWaiting = true;
    mon2.Notify();

    while (!gCreateInstanceCalled) {
      mon2.Wait();
    }
  }

  nsCOMPtr<nsISupports> component(do_GetService(kFactoryCID1, &rv));
  ASSERT_NS_SUCCEEDED(rv);

  // Reset for the contractID test
  gMainThreadWaiting = gCreateInstanceCalled = false;
  gFactory->mFirstComponentCreated = runnable->mFirstRunnableDone = true;
  component = nullptr;

  rv = newThread->Dispatch(runnable, NS_DISPATCH_NORMAL);
  ASSERT_NS_SUCCEEDED(rv);

  {
    ReentrantMonitorAutoEnter mon3(*gReentrantMonitor);

    gMainThreadWaiting = true;
    mon3.Notify();

    while (!gCreateInstanceCalled) {
      mon3.Wait();
    }
  }

  component = do_GetService(FACTORY_CONTRACTID, &rv);
  ASSERT_NS_SUCCEEDED(rv);

  NS_RELEASE(gFactory);
}

}  // namespace TestRacingServiceManager