// Copyright 2016 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 "remoting/client/chromoting_client_runtime.h"

#include "base/bind.h"
#include "base/logging.h"
#include "base/memory/singleton.h"
#include "base/message_loop/message_loop.h"
#include "base/task_scheduler/task_scheduler.h"
#include "remoting/base/chromium_url_request.h"
#include "remoting/base/telemetry_log_writer.h"
#include "remoting/base/url_request_context_getter.h"

namespace {

const char kTelemetryBaseUrl[] = "https://remoting-pa.googleapis.com/v1/events";

}  // namespace

namespace remoting {

// static
ChromotingClientRuntime* ChromotingClientRuntime::GetInstance() {
  return base::Singleton<ChromotingClientRuntime>::get();
}

ChromotingClientRuntime::ChromotingClientRuntime() {
  base::TaskScheduler::CreateAndStartWithDefaultParams("Remoting");

  if (!base::MessageLoop::current()) {
    VLOG(1) << "Starting main message loop";
    ui_loop_.reset(new base::MessageLoopForUI());
#if defined(OS_ANDROID)
    // On Android, the UI thread is managed by Java, so we need to attach and
    // start a special type of message loop to allow Chromium code to run tasks.
    ui_loop_->Start();
#elif defined(OS_IOS)
    base::MessageLoopForUI::current()->Attach();
#endif  // OS_ANDROID, OS_IOS
  } else {
    ui_loop_.reset(base::MessageLoopForUI::current());
  }

#if defined(DEBUG)
  net::URLFetcher::SetIgnoreCertificateRequests(true);
#endif  // DEBUG

  // |ui_loop_| runs on the main thread, so |ui_task_runner_| will run on the
  // main thread.  We can not kill the main thread when the message loop becomes
  // idle so the callback function does nothing (as opposed to the typical
  // base::MessageLoop::QuitClosure())
  ui_task_runner_ = new AutoThreadTaskRunner(ui_loop_->task_runner(),
                                             base::Bind(&base::DoNothing));
  audio_task_runner_ = AutoThread::Create("native_audio", ui_task_runner_);
  display_task_runner_ = AutoThread::Create("native_disp", ui_task_runner_);
  network_task_runner_ = AutoThread::CreateWithType(
      "native_net", ui_task_runner_, base::MessageLoop::TYPE_IO);
  file_task_runner_ = AutoThread::CreateWithType("native_file", ui_task_runner_,
                                                 base::MessageLoop::TYPE_IO);
  url_requester_ =
      new URLRequestContextGetter(network_task_runner_, file_task_runner_);

  CreateLogWriter();
}

ChromotingClientRuntime::~ChromotingClientRuntime() {
  if (delegate_) {
    delegate_->RuntimeWillShutdown();
  } else {
    DLOG(ERROR) << "ClientRuntime Delegate is null.";
  }

  // Block until tasks blocking shutdown have completed their execution.
  base::TaskScheduler::GetInstance()->Shutdown();

  if (delegate_) {
    delegate_->RuntimeDidShutdown();
  }
}

void ChromotingClientRuntime::SetDelegate(
    ChromotingClientRuntime::Delegate* delegate) {
  delegate_ = delegate;
}

void ChromotingClientRuntime::CreateLogWriter() {
  if (!network_task_runner()->BelongsToCurrentThread()) {
    network_task_runner()->PostTask(
        FROM_HERE, base::Bind(&ChromotingClientRuntime::CreateLogWriter,
                              base::Unretained(this)));
    return;
  }
  log_writer_.reset(new TelemetryLogWriter(
      kTelemetryBaseUrl,
      std::make_unique<ChromiumUrlRequestFactory>(url_requester())));
  log_writer_->SetAuthClosure(
      base::Bind(&ChromotingClientRuntime::RequestAuthTokenForLogger,
                 base::Unretained(this)));
}

void ChromotingClientRuntime::RequestAuthTokenForLogger() {
  if (delegate_) {
    delegate_->RequestAuthTokenForLogger();
  } else {
    DLOG(ERROR) << "ClientRuntime Delegate is null.";
  }
}

ChromotingEventLogWriter* ChromotingClientRuntime::log_writer() {
  DCHECK(network_task_runner()->BelongsToCurrentThread());
  return log_writer_.get();
}

OAuthTokenGetter* ChromotingClientRuntime::token_getter() {
  return delegate_->token_getter();
}

}  // namespace remoting