/* -*- 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 "NavigationPreloadManager.h"
#include "ServiceWorkerUtils.h"
#include "nsNetUtil.h"
#include "mozilla/StaticPrefs_dom.h"
#include "mozilla/dom/NavigationPreloadManagerBinding.h"
#include "mozilla/dom/Promise.h"
#include "mozilla/dom/ServiceWorker.h"
#include "mozilla/ipc/MessageChannel.h"

namespace mozilla::dom {

NS_IMPL_CYCLE_COLLECTING_ADDREF(NavigationPreloadManager)
NS_IMPL_CYCLE_COLLECTING_RELEASE(NavigationPreloadManager)

NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(NavigationPreloadManager)
  NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY
  NS_INTERFACE_MAP_ENTRY(nsISupports)
NS_INTERFACE_MAP_END

NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE(NavigationPreloadManager,
                                      mServiceWorkerRegistration)

/* static */
bool NavigationPreloadManager::IsValidHeader(const nsACString& aHeader) {
  return NS_IsReasonableHTTPHeaderValue(aHeader);
}

bool NavigationPreloadManager::IsEnabled(JSContext* aCx, JSObject* aGlobal) {
  return StaticPrefs::dom_serviceWorkers_navigationPreload_enabled() &&
         ServiceWorkerVisible(aCx, aGlobal);
}

NavigationPreloadManager::NavigationPreloadManager(
    RefPtr<ServiceWorkerRegistration>& aServiceWorkerRegistration)
    : mServiceWorkerRegistration(aServiceWorkerRegistration) {}

JSObject* NavigationPreloadManager::WrapObject(
    JSContext* aCx, JS::Handle<JSObject*> aGivenProto) {
  return NavigationPreloadManager_Binding::Wrap(aCx, this, aGivenProto);
}

already_AddRefed<Promise> NavigationPreloadManager::SetEnabled(
    bool aEnabled, ErrorResult& aError) {
  RefPtr<Promise> promise = Promise::Create(GetParentObject(), aError);

  if (NS_WARN_IF(aError.Failed())) {
    return nullptr;
  }

  if (!mServiceWorkerRegistration) {
    promise->MaybeReject(NS_ERROR_DOM_INVALID_STATE_ERR);
    return promise.forget();
  }

  mServiceWorkerRegistration->SetNavigationPreloadEnabled(
      aEnabled,
      [promise](bool aSuccess) {
        if (aSuccess) {
          promise->MaybeResolveWithUndefined();
          return;
        }
        promise->MaybeReject(NS_ERROR_DOM_INVALID_STATE_ERR);
      },
      [promise](ErrorResult&& aRv) { promise->MaybeReject(std::move(aRv)); });

  return promise.forget();
}

already_AddRefed<Promise> NavigationPreloadManager::Enable(
    ErrorResult& aError) {
  return SetEnabled(true, aError);
}

already_AddRefed<Promise> NavigationPreloadManager::Disable(
    ErrorResult& aError) {
  return SetEnabled(false, aError);
}

already_AddRefed<Promise> NavigationPreloadManager::SetHeaderValue(
    const nsACString& aHeader, ErrorResult& aError) {
  RefPtr<Promise> promise = Promise::Create(GetParentObject(), aError);

  if (NS_WARN_IF(aError.Failed())) {
    return nullptr;
  }

  if (!IsValidHeader(aHeader)) {
    promise->MaybeRejectWithTypeError<MSG_INVALID_HEADER_VALUE>(aHeader);
    return promise.forget();
  }

  if (!mServiceWorkerRegistration) {
    promise->MaybeReject(NS_ERROR_DOM_INVALID_STATE_ERR);
    return promise.forget();
  }

  mServiceWorkerRegistration->SetNavigationPreloadHeader(
      nsAutoCString(aHeader),
      [promise](bool aSuccess) {
        if (aSuccess) {
          promise->MaybeResolveWithUndefined();
          return;
        }
        promise->MaybeReject(NS_ERROR_DOM_INVALID_STATE_ERR);
      },
      [promise](ErrorResult&& aRv) { promise->MaybeReject(std::move(aRv)); });

  return promise.forget();
}

already_AddRefed<Promise> NavigationPreloadManager::GetState(
    ErrorResult& aError) {
  RefPtr<Promise> promise = Promise::Create(GetParentObject(), aError);

  if (NS_WARN_IF(aError.Failed())) {
    return nullptr;
  }

  if (!mServiceWorkerRegistration) {
    promise->MaybeReject(NS_ERROR_DOM_INVALID_STATE_ERR);
    return promise.forget();
  }

  mServiceWorkerRegistration->GetNavigationPreloadState(
      [promise](NavigationPreloadState&& aState) {
        promise->MaybeResolve(std::move(aState));
      },
      [promise](ErrorResult&& aRv) { promise->MaybeReject(std::move(aRv)); });

  return promise.forget();
}

}  // namespace mozilla::dom