// Copyright 2014 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 "content/child/service_worker/service_worker_provider_context.h"

#include "base/bind.h"
#include "base/message_loop/message_loop_proxy.h"
#include "base/stl_util.h"
#include "content/child/child_thread.h"
#include "content/child/service_worker/service_worker_dispatcher.h"
#include "content/child/service_worker/service_worker_handle_reference.h"
#include "content/child/thread_safe_sender.h"
#include "content/child/worker_task_runner.h"
#include "content/common/service_worker/service_worker_messages.h"

namespace content {

ServiceWorkerProviderContext::ServiceWorkerProviderContext(int provider_id)
    : provider_id_(provider_id),
      main_thread_loop_proxy_(base::MessageLoopProxy::current()) {
  if (!ChildThread::current())
    return;  // May be null in some tests.
  thread_safe_sender_ = ChildThread::current()->thread_safe_sender();
  ServiceWorkerDispatcher* dispatcher =
      ServiceWorkerDispatcher::GetOrCreateThreadSpecificInstance(
          thread_safe_sender_);
  DCHECK(dispatcher);
  dispatcher->AddProviderContext(this);
}

ServiceWorkerProviderContext::~ServiceWorkerProviderContext() {
  if (ServiceWorkerDispatcher* dispatcher =
          ServiceWorkerDispatcher::GetThreadSpecificInstance()) {
    dispatcher->RemoveProviderContext(this);
  }
}

ServiceWorkerHandleReference* ServiceWorkerProviderContext::installing() {
  DCHECK(main_thread_loop_proxy_->RunsTasksOnCurrentThread());
  return installing_.get();
}

ServiceWorkerHandleReference* ServiceWorkerProviderContext::waiting() {
  DCHECK(main_thread_loop_proxy_->RunsTasksOnCurrentThread());
  return waiting_.get();
}

ServiceWorkerHandleReference* ServiceWorkerProviderContext::active() {
  DCHECK(main_thread_loop_proxy_->RunsTasksOnCurrentThread());
  return active_.get();
}

ServiceWorkerHandleReference* ServiceWorkerProviderContext::controller() {
  DCHECK(main_thread_loop_proxy_->RunsTasksOnCurrentThread());
  return controller_.get();
}

void ServiceWorkerProviderContext::OnServiceWorkerStateChanged(
    int handle_id,
    blink::WebServiceWorkerState state) {
  ServiceWorkerHandleReference* which = NULL;
  if (handle_id == controller_handle_id())
    which = controller_.get();
  else if (handle_id == active_handle_id())
    which = active_.get();
  else if (handle_id == waiting_handle_id())
    which = waiting_.get();
  else if (handle_id == installing_handle_id())
    which = installing_.get();

  // We should only get messages for ServiceWorkers associated with
  // this provider.
  DCHECK(which);

  which->set_state(state);

  // TODO(kinuko): We can forward the message to other threads here
  // when we support navigator.serviceWorker in dedicated workers.
}

void ServiceWorkerProviderContext::OnSetInstallingServiceWorker(
    int provider_id,
    const ServiceWorkerObjectInfo& info) {
  DCHECK_EQ(provider_id_, provider_id);
  installing_ = ServiceWorkerHandleReference::Adopt(info, thread_safe_sender_);
}

void ServiceWorkerProviderContext::OnSetWaitingServiceWorker(
    int provider_id,
    const ServiceWorkerObjectInfo& info) {
  DCHECK_EQ(provider_id_, provider_id);
  waiting_ = ServiceWorkerHandleReference::Adopt(info, thread_safe_sender_);
}

void ServiceWorkerProviderContext::OnSetActiveServiceWorker(
    int provider_id,
    const ServiceWorkerObjectInfo& info) {
  DCHECK_EQ(provider_id_, provider_id);
  active_ = ServiceWorkerHandleReference::Adopt(info, thread_safe_sender_);
}

void ServiceWorkerProviderContext::OnSetControllerServiceWorker(
    int provider_id,
    const ServiceWorkerObjectInfo& info) {
  DCHECK_EQ(provider_id_, provider_id);

  // This context is is the primary owner of this handle, keeps the
  // initial reference until it goes away.
  controller_ = ServiceWorkerHandleReference::Adopt(info, thread_safe_sender_);

  // TODO(kinuko): We can forward the message to other threads here
  // when we support navigator.serviceWorker in dedicated workers.
}

int ServiceWorkerProviderContext::installing_handle_id() const {
  DCHECK(main_thread_loop_proxy_->RunsTasksOnCurrentThread());
  return installing_ ? installing_->info().handle_id
                     : kInvalidServiceWorkerHandleId;
}

int ServiceWorkerProviderContext::waiting_handle_id() const {
  DCHECK(main_thread_loop_proxy_->RunsTasksOnCurrentThread());
  return waiting_ ? waiting_->info().handle_id
                  : kInvalidServiceWorkerHandleId;
}

int ServiceWorkerProviderContext::active_handle_id() const {
  DCHECK(main_thread_loop_proxy_->RunsTasksOnCurrentThread());
  return active_ ? active_->info().handle_id
                 : kInvalidServiceWorkerHandleId;
}

int ServiceWorkerProviderContext::controller_handle_id() const {
  DCHECK(main_thread_loop_proxy_->RunsTasksOnCurrentThread());
  return controller_ ? controller_->info().handle_id
                     : kInvalidServiceWorkerHandleId;
}

}  // namespace content