/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* 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 "QuotaRequests.h"

#include "ActorsChild.h"
#include "nsIQuotaCallbacks.h"

namespace mozilla {
namespace dom {
namespace quota {

RequestBase::RequestBase() : mResultCode(NS_OK), mHaveResultOrErrorCode(false) {
  AssertIsOnOwningThread();
}

RequestBase::RequestBase(nsIPrincipal* aPrincipal)
    : mPrincipal(aPrincipal),
      mResultCode(NS_OK),
      mHaveResultOrErrorCode(false) {
  AssertIsOnOwningThread();
}

#ifdef DEBUG

void RequestBase::AssertIsOnOwningThread() const {
  NS_ASSERT_OWNINGTHREAD(RequestBase);
}

#endif  // DEBUG

void RequestBase::SetError(nsresult aRv) {
  AssertIsOnOwningThread();
  MOZ_ASSERT(mResultCode == NS_OK);
  MOZ_ASSERT(!mHaveResultOrErrorCode);

  mResultCode = aRv;
  mHaveResultOrErrorCode = true;

  FireCallback();
}

NS_IMPL_CYCLE_COLLECTION_0(RequestBase)

NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(RequestBase)
  NS_INTERFACE_MAP_ENTRY(nsISupports)
NS_INTERFACE_MAP_END

NS_IMPL_CYCLE_COLLECTING_ADDREF(RequestBase)
NS_IMPL_CYCLE_COLLECTING_RELEASE(RequestBase)

NS_IMETHODIMP
RequestBase::GetPrincipal(nsIPrincipal** aPrincipal) {
  AssertIsOnOwningThread();
  MOZ_ASSERT(aPrincipal);

  NS_IF_ADDREF(*aPrincipal = mPrincipal);
  return NS_OK;
}

NS_IMETHODIMP
RequestBase::GetResultCode(nsresult* aResultCode) {
  AssertIsOnOwningThread();
  MOZ_ASSERT(aResultCode);

  if (!mHaveResultOrErrorCode) {
    return NS_ERROR_FAILURE;
  }

  *aResultCode = mResultCode;
  return NS_OK;
}

UsageRequest::UsageRequest(nsIQuotaUsageCallback* aCallback)
    : mCallback(aCallback), mBackgroundActor(nullptr), mCanceled(false) {
  AssertIsOnOwningThread();
  MOZ_ASSERT(aCallback);
}

UsageRequest::UsageRequest(nsIPrincipal* aPrincipal,
                           nsIQuotaUsageCallback* aCallback)
    : RequestBase(aPrincipal),
      mCallback(aCallback),
      mBackgroundActor(nullptr),
      mCanceled(false) {
  AssertIsOnOwningThread();
  MOZ_ASSERT(aPrincipal);
  MOZ_ASSERT(aCallback);
}

UsageRequest::~UsageRequest() { AssertIsOnOwningThread(); }

void UsageRequest::SetBackgroundActor(
    QuotaUsageRequestChild* aBackgroundActor) {
  AssertIsOnOwningThread();
  MOZ_ASSERT(aBackgroundActor);
  MOZ_ASSERT(!mBackgroundActor);

  mBackgroundActor = aBackgroundActor;

  if (mCanceled) {
    mBackgroundActor->SendCancel();
  }
}

void UsageRequest::SetResult(nsIVariant* aResult) {
  AssertIsOnOwningThread();
  MOZ_ASSERT(aResult);
  MOZ_ASSERT(!mHaveResultOrErrorCode);

  mResult = aResult;

  mHaveResultOrErrorCode = true;

  FireCallback();
}

NS_IMPL_CYCLE_COLLECTION_INHERITED(UsageRequest, RequestBase, mCallback)

NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(UsageRequest)
  NS_INTERFACE_MAP_ENTRY(nsIQuotaUsageRequest)
NS_INTERFACE_MAP_END_INHERITING(RequestBase)

NS_IMPL_ADDREF_INHERITED(UsageRequest, RequestBase)
NS_IMPL_RELEASE_INHERITED(UsageRequest, RequestBase)

NS_IMETHODIMP
UsageRequest::GetResult(nsIVariant** aResult) {
  AssertIsOnOwningThread();
  MOZ_ASSERT(aResult);

  if (!mHaveResultOrErrorCode) {
    return NS_ERROR_FAILURE;
  }

  NS_IF_ADDREF(*aResult = mResult);
  return NS_OK;
}

NS_IMETHODIMP
UsageRequest::GetCallback(nsIQuotaUsageCallback** aCallback) {
  AssertIsOnOwningThread();
  MOZ_ASSERT(aCallback);

  NS_IF_ADDREF(*aCallback = mCallback);
  return NS_OK;
}

NS_IMETHODIMP
UsageRequest::SetCallback(nsIQuotaUsageCallback* aCallback) {
  AssertIsOnOwningThread();

  mCallback = aCallback;
  return NS_OK;
}

NS_IMETHODIMP
UsageRequest::Cancel() {
  AssertIsOnOwningThread();

  if (mCanceled) {
    NS_WARNING("Canceled more than once?!");
    return NS_ERROR_UNEXPECTED;
  }

  if (mBackgroundActor) {
    mBackgroundActor->SendCancel();
  }

  mCanceled = true;

  return NS_OK;
}

void UsageRequest::FireCallback() {
  AssertIsOnOwningThread();
  MOZ_ASSERT(mCallback);

  mCallback->OnUsageResult(this);

  // Clean up.
  mCallback = nullptr;
}

Request::Request() { AssertIsOnOwningThread(); }

Request::Request(nsIPrincipal* aPrincipal) : RequestBase(aPrincipal) {
  AssertIsOnOwningThread();
  MOZ_ASSERT(aPrincipal);
}

Request::~Request() { AssertIsOnOwningThread(); }

void Request::SetResult(nsIVariant* aResult) {
  AssertIsOnOwningThread();
  MOZ_ASSERT(aResult);
  MOZ_ASSERT(!mHaveResultOrErrorCode);

  mResult = aResult;

  mHaveResultOrErrorCode = true;

  FireCallback();
}

NS_IMETHODIMP
Request::GetResult(nsIVariant** aResult) {
  AssertIsOnOwningThread();
  MOZ_ASSERT(aResult);

  if (!mHaveResultOrErrorCode) {
    return NS_ERROR_FAILURE;
  }

  NS_IF_ADDREF(*aResult = mResult);
  return NS_OK;
}

NS_IMPL_CYCLE_COLLECTION_INHERITED(Request, RequestBase, mCallback, mResult)

NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(Request)
  NS_INTERFACE_MAP_ENTRY(nsIQuotaRequest)
NS_INTERFACE_MAP_END_INHERITING(RequestBase)

NS_IMPL_ADDREF_INHERITED(mozilla::dom::quota::Request, RequestBase)
NS_IMPL_RELEASE_INHERITED(mozilla::dom::quota::Request, RequestBase)

NS_IMETHODIMP
Request::GetCallback(nsIQuotaCallback** aCallback) {
  AssertIsOnOwningThread();
  MOZ_ASSERT(aCallback);

  NS_IF_ADDREF(*aCallback = mCallback);
  return NS_OK;
}

NS_IMETHODIMP
Request::SetCallback(nsIQuotaCallback* aCallback) {
  AssertIsOnOwningThread();

  mCallback = aCallback;
  return NS_OK;
}

void Request::FireCallback() {
  AssertIsOnOwningThread();

  if (mCallback) {
    mCallback->OnComplete(this);

    // Clean up.
    mCallback = nullptr;
  }
}

}  // namespace quota
}  // namespace dom
}  // namespace mozilla