// Copyright (c) 2012 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 "chrome/browser/extensions/event_router_forwarder.h"

#include <stddef.h>
#include <memory>
#include <utility>

#include "base/bind.h"
#include "base/task/post_task.h"
#include "base/values.h"
#include "build/build_config.h"
#include "chrome/browser/browser_process.h"
#include "chrome/browser/profiles/profile_manager.h"
#include "content/public/browser/browser_task_traits.h"
#include "content/public/browser/browser_thread.h"
#include "extensions/browser/event_router.h"
#include "url/gurl.h"

using content::BrowserThread;

namespace extensions {

EventRouterForwarder::EventRouterForwarder() {
}

EventRouterForwarder::~EventRouterForwarder() {
}

void EventRouterForwarder::BroadcastEventToRenderers(
    events::HistogramValue histogram_value,
    const std::string& event_name,
    std::unique_ptr<base::ListValue> event_args,
    const GURL& event_url) {
  HandleEvent(std::string(), histogram_value, event_name, std::move(event_args),
              0, true, event_url);
}

void EventRouterForwarder::DispatchEventToRenderers(
    events::HistogramValue histogram_value,
    const std::string& event_name,
    std::unique_ptr<base::ListValue> event_args,
    void* profile,
    bool use_profile_to_restrict_events,
    const GURL& event_url) {
  if (!profile)
    return;
  HandleEvent(std::string(), histogram_value, event_name, std::move(event_args),
              profile, use_profile_to_restrict_events, event_url);
}

void EventRouterForwarder::HandleEvent(
    const std::string& extension_id,
    events::HistogramValue histogram_value,
    const std::string& event_name,
    std::unique_ptr<base::ListValue> event_args,
    void* profile_ptr,
    bool use_profile_to_restrict_events,
    const GURL& event_url) {
  if (!BrowserThread::CurrentlyOn(BrowserThread::UI)) {
    base::PostTaskWithTraits(
        FROM_HERE, {BrowserThread::UI},
        base::BindOnce(&EventRouterForwarder::HandleEvent, this, extension_id,
                       histogram_value, event_name, std::move(event_args),
                       profile_ptr, use_profile_to_restrict_events, event_url));
    return;
  }

  if (!g_browser_process || !g_browser_process->profile_manager())
    return;

  ProfileManager* profile_manager = g_browser_process->profile_manager();
  Profile* profile = NULL;
  if (profile_ptr) {
    if (!profile_manager->IsValidProfile(profile_ptr))
      return;
    profile = reinterpret_cast<Profile*>(profile_ptr);
  }
  if (profile) {
    CallEventRouter(profile, extension_id, histogram_value, event_name,
                    std::move(event_args),
                    use_profile_to_restrict_events ? profile : NULL, event_url);
  } else {
    std::vector<Profile*> profiles(profile_manager->GetLoadedProfiles());
    for (size_t i = 0; i < profiles.size(); ++i) {
      std::unique_ptr<base::ListValue> per_profile_event_args(
          event_args->DeepCopy());
      CallEventRouter(profiles[i], extension_id, histogram_value, event_name,
                      std::move(per_profile_event_args),
                      use_profile_to_restrict_events ? profiles[i] : NULL,
                      event_url);
    }
  }
}

void EventRouterForwarder::CallEventRouter(
    Profile* profile,
    const std::string& extension_id,
    events::HistogramValue histogram_value,
    const std::string& event_name,
    std::unique_ptr<base::ListValue> event_args,
    Profile* restrict_to_profile,
    const GURL& event_url) {
#if defined(OS_CHROMEOS)
  // Extension does not exist for chromeos login.  This needs to be
  // removed once we have an extension service for login screen.
  // crosbug.com/12856.
  if (!extensions::EventRouter::Get(profile))
    return;
#endif

  auto event = std::make_unique<Event>(
      histogram_value, event_name, std::move(event_args), restrict_to_profile);
  event->event_url = event_url;
  if (extension_id.empty()) {
    extensions::EventRouter::Get(profile)->BroadcastEvent(std::move(event));
  } else {
    extensions::EventRouter::Get(profile)
        ->DispatchEventToExtension(extension_id, std::move(event));
  }
}

}  // namespace extensions