// 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 <cstddef>
#include <cstdio>
#include <string>

#include "base/at_exit.h"
#include "base/command_line.h"
#include "base/compiler_specific.h"
#include "base/logging.h"
#include "base/memory/ref_counted.h"
#include "base/memory/scoped_ptr.h"
#include "base/message_loop/message_loop.h"
#include "base/rand_util.h"
#include "base/threading/thread.h"
#include "jingle/notifier/base/notification_method.h"
#include "jingle/notifier/base/notifier_options.h"
#include "net/base/host_port_pair.h"
#include "net/base/network_change_notifier.h"
#include "net/dns/host_resolver.h"
#include "net/http/transport_security_state.h"
#include "net/url_request/url_request_test_util.h"
#include "sync/internal_api/public/base/model_type.h"
#include "sync/internal_api/public/base/model_type_invalidation_map.h"
#include "sync/notifier/invalidation_handler.h"
#include "sync/notifier/invalidation_state_tracker.h"
#include "sync/notifier/invalidation_util.h"
#include "sync/notifier/invalidator.h"
#include "sync/notifier/non_blocking_invalidator.h"
#include "sync/tools/null_invalidation_state_tracker.h"

#if defined(OS_MACOSX)
#include "base/mac/scoped_nsautorelease_pool.h"
#endif

// This is a simple utility that initializes a sync notifier and
// listens to any received notifications.

namespace syncer {
namespace {

const char kEmailSwitch[] = "email";
const char kTokenSwitch[] = "token";
const char kHostPortSwitch[] = "host-port";
const char kTrySslTcpFirstSwitch[] = "try-ssltcp-first";
const char kAllowInsecureConnectionSwitch[] = "allow-insecure-connection";
const char kNotificationMethodSwitch[] = "notification-method";

// Class to print received notifications events.
class NotificationPrinter : public InvalidationHandler {
 public:
  NotificationPrinter() {}
  virtual ~NotificationPrinter() {}

  virtual void OnInvalidatorStateChange(InvalidatorState state) OVERRIDE {
    LOG(INFO) << "Invalidator state changed to "
              << InvalidatorStateToString(state);
  }

  virtual void OnIncomingInvalidation(
      const ObjectIdInvalidationMap& invalidation_map) OVERRIDE {
    const ModelTypeInvalidationMap& type_invalidation_map =
        ObjectIdInvalidationMapToModelTypeInvalidationMap(invalidation_map);
    for (ModelTypeInvalidationMap::const_iterator it =
             type_invalidation_map.begin(); it != type_invalidation_map.end();
         ++it) {
      LOG(INFO) << "Remote invalidation: type = "
                << ModelTypeToString(it->first)
                << ", payload = " << it->second.payload;
    }
  }

 private:
  DISALLOW_COPY_AND_ASSIGN(NotificationPrinter);
};

// Needed to use a real host resolver.
class MyTestURLRequestContext : public net::TestURLRequestContext {
 public:
  MyTestURLRequestContext() : TestURLRequestContext(true) {
    context_storage_.set_host_resolver(
        net::HostResolver::CreateDefaultResolver(NULL));
    context_storage_.set_transport_security_state(
        new net::TransportSecurityState());
    Init();
  }

  virtual ~MyTestURLRequestContext() {}
};

class MyTestURLRequestContextGetter : public net::TestURLRequestContextGetter {
 public:
  explicit MyTestURLRequestContextGetter(
      const scoped_refptr<base::MessageLoopProxy>& io_message_loop_proxy)
      : TestURLRequestContextGetter(io_message_loop_proxy) {}

  virtual net::TestURLRequestContext* GetURLRequestContext() OVERRIDE {
    // Construct |context_| lazily so it gets constructed on the right
    // thread (the IO thread).
    if (!context_)
      context_.reset(new MyTestURLRequestContext());
    return context_.get();
  }

 private:
  virtual ~MyTestURLRequestContextGetter() {}

  scoped_ptr<MyTestURLRequestContext> context_;
};

notifier::NotifierOptions ParseNotifierOptions(
    const CommandLine& command_line,
    const scoped_refptr<net::URLRequestContextGetter>&
        request_context_getter) {
  notifier::NotifierOptions notifier_options;
  notifier_options.request_context_getter = request_context_getter;

  if (command_line.HasSwitch(kHostPortSwitch)) {
    notifier_options.xmpp_host_port =
        net::HostPortPair::FromString(
            command_line.GetSwitchValueASCII(kHostPortSwitch));
    LOG(INFO) << "Using " << notifier_options.xmpp_host_port.ToString()
              << " for test sync notification server.";
  }

  notifier_options.try_ssltcp_first =
      command_line.HasSwitch(kTrySslTcpFirstSwitch);
  LOG_IF(INFO, notifier_options.try_ssltcp_first)
      << "Trying SSL/TCP port before XMPP port for notifications.";

  notifier_options.allow_insecure_connection =
      command_line.HasSwitch(kAllowInsecureConnectionSwitch);
  LOG_IF(INFO, notifier_options.allow_insecure_connection)
      << "Allowing insecure XMPP connections.";

  return notifier_options;
}

int SyncListenNotificationsMain(int argc, char* argv[]) {
  using namespace syncer;
#if defined(OS_MACOSX)
  base::mac::ScopedNSAutoreleasePool pool;
#endif
  base::AtExitManager exit_manager;
  CommandLine::Init(argc, argv);
  logging::LoggingSettings settings;
  settings.logging_dest = logging::LOG_TO_SYSTEM_DEBUG_LOG;
  logging::InitLogging(settings);

  base::MessageLoop ui_loop;
  base::Thread io_thread("IO thread");
  base::Thread::Options options;
  options.message_loop_type = base::MessageLoop::TYPE_IO;
  io_thread.StartWithOptions(options);

  // Parse command line.
  const CommandLine& command_line = *CommandLine::ForCurrentProcess();
  std::string email = command_line.GetSwitchValueASCII(kEmailSwitch);
  std::string token = command_line.GetSwitchValueASCII(kTokenSwitch);
  // TODO(akalin): Write a wrapper script that gets a token for an
  // email and password and passes that in to this utility.
  if (email.empty() || token.empty()) {
    std::printf("Usage: %s --%s=foo@bar.com --%s=token\n"
                "[--%s=host:port] [--%s] [--%s]\n"
                "Run chrome and set a breakpoint on\n"
                "syncer::SyncManagerImpl::UpdateCredentials() "
                "after logging into\n"
                "sync to get the token to pass into this utility.\n",
                argv[0],
                kEmailSwitch, kTokenSwitch, kHostPortSwitch,
                kTrySslTcpFirstSwitch, kAllowInsecureConnectionSwitch);
    return -1;
  }

  // Set up objects that monitor the network.
  scoped_ptr<net::NetworkChangeNotifier> network_change_notifier(
      net::NetworkChangeNotifier::Create());

  const notifier::NotifierOptions& notifier_options =
      ParseNotifierOptions(
          command_line,
          new MyTestURLRequestContextGetter(io_thread.message_loop_proxy()));
  const char kClientInfo[] = "sync_listen_notifications";
  NullInvalidationStateTracker null_invalidation_state_tracker;
  scoped_ptr<Invalidator> invalidator(
      new NonBlockingInvalidator(
          notifier_options,
          base::RandBytesAsString(8),
          null_invalidation_state_tracker.GetAllInvalidationStates(),
          null_invalidation_state_tracker.GetBootstrapData(),
          WeakHandle<InvalidationStateTracker>(
              null_invalidation_state_tracker.AsWeakPtr()),
          kClientInfo));

  NotificationPrinter notification_printer;

  invalidator->UpdateCredentials(email, token);

  // Listen for notifications for all known types.
  invalidator->RegisterHandler(&notification_printer);
  invalidator->UpdateRegisteredIds(
      &notification_printer, ModelTypeSetToObjectIdSet(ModelTypeSet::All()));

  ui_loop.Run();

  invalidator->UnregisterHandler(&notification_printer);
  io_thread.Stop();
  return 0;
}

}  // namespace
}  // namespace syncer

int main(int argc, char* argv[]) {
  return syncer::SyncListenNotificationsMain(argc, argv);
}