// Copyright (c) 2006-2008 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 <sstream>

#include "chrome/test/automation/automation_proxy.h"

#include "base/logging.h"
#include "base/ref_counted.h"
#include "chrome/test/automation/automation_constants.h"
#include "chrome/test/automation/automation_messages.h"
#include "chrome/test/automation/browser_proxy.h"
#include "chrome/test/automation/tab_proxy.h"
#include "chrome/test/automation/window_proxy.h"
#include "chrome/views/dialog_delegate.h"

using base::TimeDelta;
using base::TimeTicks;

// This class exists to group together the data and functionality used for
// synchronous automation requests.
class AutomationRequest :
    public base::RefCountedThreadSafe<AutomationRequest> {
public:
  AutomationRequest() {
    static int32 routing_id = 0;
    routing_id_ = ++routing_id;
    received_response_ = ::CreateEvent(NULL, TRUE, FALSE, NULL);
    DCHECK(received_response_);
  }
  ~AutomationRequest() {
    DCHECK(received_response_);
    ::CloseHandle(received_response_);
  }

  // This is called on the foreground thread to block while waiting for a
  // response from the app.
  // The function returns true if response is received, and returns false
  // if there is a failure or timeout.
  bool WaitForResponse(uint32 timeout_ms, bool* is_timeout) {
    uint32 result = ::WaitForSingleObject(received_response_, timeout_ms);
    if (is_timeout)
      *is_timeout = (result == WAIT_TIMEOUT);

    return result != WAIT_FAILED && result != WAIT_TIMEOUT;
  }

  // This is called on the background thread once the response has been
  // received and the foreground thread can resume execution.
  bool SignalResponseReady(const IPC::Message& response) {
    response_.reset(new IPC::Message(response));

    DCHECK(received_response_);
    return !!::SetEvent(received_response_);
  }

  // This can be used to take ownership of the response object that
  // we've received, reducing the need to copy the message.
  void GrabResponse(IPC::Message** response) {
    DCHECK(response);
    *response = response_.get();
    response_.release();
  }

  int32 routing_id() { return routing_id_; }

  const IPC::Message& response() {
    DCHECK(response_.get());
    return *(response_.get());
  }

private:
  DISALLOW_EVIL_CONSTRUCTORS(AutomationRequest);

  int32 routing_id_;
  scoped_ptr<IPC::Message> response_;
  HANDLE received_response_;
};

namespace {

// This object allows messages received on the background thread to be
// properly triaged.
class AutomationMessageFilter : public IPC::ChannelProxy::MessageFilter {
 public:
  AutomationMessageFilter(AutomationProxy* server) : server_(server) {}

  // Return true to indicate that the message was handled, or false to let
  // the message be handled in the default way.
  virtual bool OnMessageReceived(const IPC::Message& message) {
    {
      // Here we're checking to see if it matches the (because there should
      // be at most one) synchronous request.  If the received message is
      // the response to the synchronous request, we clear the server's
      // "current_request" pointer and signal to the request object that
      // the response is ready for processing.  We're clearing current_request
      // here rather than on the foreground thread so that we can assert
      // that both threads perceive it as cleared at the time that the
      // foreground thread wakes up.
      scoped_refptr<AutomationRequest> request = server_->current_request();
      if (request.get() && (message.routing_id() == request->routing_id())) {
        server_->clear_current_request();
        request->SignalResponseReady(message);
        return true;
      }
      if (message.routing_id() > 0) {
        // The message is either the previous async response or arrived
        // after timeout.
        return true;
      }
    }

    bool handled = true;

    IPC_BEGIN_MESSAGE_MAP(AutomationMessageFilter, message)
      IPC_MESSAGE_HANDLER_GENERIC(
        AutomationMsg_Hello, server_->SignalAppLaunch());
      IPC_MESSAGE_HANDLER_GENERIC(
        AutomationMsg_InitialLoadsComplete, server_->SignalInitialLoads());
      IPC_MESSAGE_HANDLER(AutomationMsg_InitialNewTabUILoadComplete,
                          NewTabLoaded);
      IPC_MESSAGE_HANDLER_GENERIC(
        AutomationMsg_InvalidateHandle, server_->InvalidateHandle(message));
      IPC_MESSAGE_UNHANDLED(handled = false);
    IPC_END_MESSAGE_MAP()

    return handled;
  }

  void NewTabLoaded(int load_time) {
    server_->SignalNewTabUITab(load_time);
  }

 private:
  AutomationProxy* server_;
};

}  // anonymous namespace


AutomationProxy::AutomationProxy(int command_execution_timeout_ms)
    : current_request_(NULL),
      command_execution_timeout_ms_(command_execution_timeout_ms) {
  InitializeEvents();
  InitializeChannelID();
  InitializeHandleTracker();
  InitializeThread();
  InitializeChannel();
}

AutomationProxy::~AutomationProxy() {
  DCHECK(shutdown_event_.get() != NULL);
  ::SetEvent(shutdown_event_->handle());
  // Destruction order is important. Thread has to outlive the channel and
  // tracker has to outlive the thread since we access the tracker inside
  // AutomationMessageFilter::OnMessageReceived.
  channel_.reset();
  thread_.reset();
  DCHECK(NULL == current_request_);
  tracker_.reset();
  ::CloseHandle(app_launched_);
  ::CloseHandle(initial_loads_complete_);
  ::CloseHandle(new_tab_ui_load_complete_);
}

void AutomationProxy::InitializeEvents() {
  app_launched_ =
      CreateEvent(NULL,   // Handle cannot be inherited by child processes.
                  TRUE,   // No automatic reset after a waiting thread released.
                  FALSE,  // Initially not signalled.
                  NULL);  // No name.
  DCHECK(app_launched_);

  // See the above call to CreateEvent to understand these parameters.
  initial_loads_complete_ = CreateEvent(NULL, TRUE, FALSE, NULL);
  DCHECK(initial_loads_complete_);

  // See the above call to CreateEvent to understand these parameters.
  new_tab_ui_load_complete_ = CreateEvent(NULL, TRUE, FALSE, NULL);
  DCHECK(new_tab_ui_load_complete_);

  shutdown_event_.reset(new base::WaitableEvent(true, false));
}

void AutomationProxy::InitializeChannelID() {
  // The channel counter keeps us out of trouble if we create and destroy
  // several AutomationProxies sequentially over the course of a test run.
  // (Creating the channel sometimes failed before when running a lot of
  // tests in sequence, and our theory is that sometimes the channel ID
  // wasn't getting freed up in time for the next test.)
  static int channel_counter = 0;

  std::wostringstream buf;
  buf << L"ChromeTestingInterface:" << GetCurrentProcessId() <<
         L"." << ++channel_counter;
  channel_id_ = buf.str();
}

void AutomationProxy::InitializeThread() {
  scoped_ptr<base::Thread> thread(
      new base::Thread("AutomationProxy_BackgroundThread"));
  base::Thread::Options options;
  options.message_loop_type = MessageLoop::TYPE_IO;
  bool thread_result = thread->StartWithOptions(options);
  DCHECK(thread_result);
  thread_.swap(thread);
}

void AutomationProxy::InitializeChannel() {
  DCHECK(shutdown_event_.get() != NULL);

  // TODO(iyengar)
  // The shutdown event could be global on the same lines as the automation
  // provider, where we use the shutdown event provided by the chrome browser
  // process.
  channel_.reset(new IPC::SyncChannel(
    channel_id_,
    IPC::Channel::MODE_SERVER,
    this,  // we are the listener
    new AutomationMessageFilter(this),
    thread_->message_loop(),
    true,
    shutdown_event_.get()));
}

void AutomationProxy::InitializeHandleTracker() {
  tracker_.reset(new AutomationHandleTracker(this));
}

bool AutomationProxy::WaitForAppLaunch() {
  return ::WaitForSingleObject(app_launched_,
                               command_execution_timeout_ms_) == WAIT_OBJECT_0;
}

void AutomationProxy::SignalAppLaunch() {
  ::SetEvent(app_launched_);
}

bool AutomationProxy::WaitForInitialLoads() {
  return ::WaitForSingleObject(initial_loads_complete_,
                               command_execution_timeout_ms_) == WAIT_OBJECT_0;
}

bool AutomationProxy::WaitForInitialNewTabUILoad(int* load_time) {
  if (::WaitForSingleObject(new_tab_ui_load_complete_,
                            command_execution_timeout_ms_) == WAIT_OBJECT_0) {
    *load_time = new_tab_ui_load_time_;
    ::ResetEvent(new_tab_ui_load_complete_);
    return true;
  }
  return false;
}

void AutomationProxy::SignalInitialLoads() {
  ::SetEvent(initial_loads_complete_);
}

void AutomationProxy::SignalNewTabUITab(int load_time) {
  new_tab_ui_load_time_ = load_time;
  ::SetEvent(new_tab_ui_load_complete_);
}

bool AutomationProxy::SavePackageShouldPromptUser(bool should_prompt) {
  return Send(new AutomationMsg_SavePackageShouldPromptUser(0, should_prompt));
}

bool AutomationProxy::GetBrowserWindowCount(int* num_windows) {
  if (!num_windows) {
    NOTREACHED();
    return false;
  }

  bool succeeded = SendWithTimeout(
      new AutomationMsg_BrowserWindowCount(0, num_windows),
      command_execution_timeout_ms_, NULL);

  if (!succeeded) {
    DLOG(ERROR) << "GetWindowCount did not complete in a timely fashion";
    return false;
  }

  return succeeded;
}

bool AutomationProxy::WaitForWindowCountToChange(int count, int* new_count,
                                                 int wait_timeout) {
  const TimeTicks start = TimeTicks::Now();
  const TimeDelta timeout = TimeDelta::FromMilliseconds(wait_timeout);
  while (TimeTicks::Now() - start < timeout) {
    bool succeeded = GetBrowserWindowCount(new_count);
    if (!succeeded) return false;
    if (count != *new_count) return true;
    Sleep(automation::kSleepTime);
  }
  // Window count never changed.
  return false;
}

bool AutomationProxy::WaitForWindowCountToBecome(int count,
                                                 int wait_timeout) {
  const TimeTicks start = TimeTicks::Now();
  const TimeDelta timeout = TimeDelta::FromMilliseconds(wait_timeout);
  while (TimeTicks::Now() - start < timeout) {
    int new_count;
    bool succeeded = GetBrowserWindowCount(&new_count);
    if (!succeeded) {
      // Try again next round, but log it.
      DLOG(ERROR) << "GetBrowserWindowCount returned false";
    } else if (count == new_count) {
      return true;
    }
    Sleep(automation::kSleepTime);
  }
  // Window count never reached the value we sought.
  return false;
}

bool AutomationProxy::GetShowingAppModalDialog(
    bool* showing_app_modal_dialog,
    views::DialogDelegate::DialogButton* button) {
  if (!showing_app_modal_dialog || !button) {
    NOTREACHED();
    return false;
  }

  int button_int = 0;

  if (!SendWithTimeout(
          new AutomationMsg_ShowingAppModalDialog(
              0, showing_app_modal_dialog, &button_int),
          command_execution_timeout_ms_, NULL)) {
    DLOG(ERROR) << "ShowingAppModalDialog did not complete in a timely fashion";
    return false;
  }

  *button = static_cast<views::DialogDelegate::DialogButton>(button_int);
  return true;
}

bool AutomationProxy::ClickAppModalDialogButton(
    views::DialogDelegate::DialogButton button) {
  bool succeeded = false;

  if (!SendWithTimeout(
          new AutomationMsg_ClickAppModalDialogButton(
              0, button, &succeeded), command_execution_timeout_ms_, NULL)) {
    return false;
  }

  return succeeded;
}

bool AutomationProxy::WaitForAppModalDialog(int wait_timeout) {
  const TimeTicks start = TimeTicks::Now();
  const TimeDelta timeout = TimeDelta::FromMilliseconds(wait_timeout);
  while (TimeTicks::Now() - start < timeout) {
    bool dialog_shown = false;
    views::DialogDelegate::DialogButton button =
        views::DialogDelegate::DIALOGBUTTON_NONE;
    bool succeeded = GetShowingAppModalDialog(&dialog_shown, &button);
    if (!succeeded) {
      // Try again next round, but log it.
      DLOG(ERROR) << "GetShowingAppModalDialog returned false";
    } else if (dialog_shown) {
      return true;
    }
    Sleep(automation::kSleepTime);
  }
  // Dialog never shown.
  return false;
}

bool AutomationProxy::SetFilteredInet(bool enabled) {
  return Send(new AutomationMsg_SetFilteredInet(0, enabled));
}

void AutomationProxy::Disconnect() {
  channel_.reset();
}

void AutomationProxy::OnMessageReceived(const IPC::Message& msg) {
  // This won't get called unless AutomationProxy is run from
  // inside a message loop.
  NOTREACHED();
}

void AutomationProxy::OnChannelError() {
  DLOG(ERROR) << "Channel error in AutomationProxy.";
}

WindowProxy* AutomationProxy::GetActiveWindow() {
  int handle = 0;

  if (!SendWithTimeout(new AutomationMsg_ActiveWindow(0, &handle),
                       command_execution_timeout_ms_, NULL)) {
    return NULL;
  }

  return new WindowProxy(this, tracker_.get(), handle);
}


BrowserProxy* AutomationProxy::GetBrowserWindow(int window_index) {
  int handle = 0;

  if (!SendWithTimeout(new AutomationMsg_BrowserWindow(0, window_index,
                                                       &handle),
                       command_execution_timeout_ms_, NULL)) {
    DLOG(ERROR) << "GetBrowserWindow did not complete in a timely fashion";
    return NULL;
  }

  if (handle == 0) {
    return NULL;
  }

  return new BrowserProxy(this, tracker_.get(), handle);
}

BrowserProxy* AutomationProxy::GetLastActiveBrowserWindow() {
  int handle = 0;

  if (!SendWithTimeout(new AutomationMsg_LastActiveBrowserWindow(
          0, &handle), command_execution_timeout_ms_, NULL)) {
    DLOG(ERROR) << "GetLastActiveBrowserWindow did not complete in a timely fashion";
    return NULL;
  }

  return new BrowserProxy(this, tracker_.get(), handle);
}

bool AutomationProxy::Send(IPC::Message* message) {
  return SendWithTimeout(message, INFINITE, NULL);
}

bool AutomationProxy::SendWithTimeout(IPC::Message* message, int timeout,
                                      bool* is_timeout) {
  if (is_timeout)
    *is_timeout = false;

  if (channel_.get()) {
    bool result = channel_->SendWithTimeout(message, timeout);
    if (!result && is_timeout)
      *is_timeout = true;
    return result;
  }

  DLOG(WARNING) << "Channel has been closed; dropping message!";
  delete message;
  return false;
}

void AutomationProxy::InvalidateHandle(const IPC::Message& message) {
  void* iter = NULL;
  int handle;

  if (message.ReadInt(&iter, &handle)) {
    tracker_->InvalidateHandle(handle);
  }
}

bool AutomationProxy::OpenNewBrowserWindow(int show_command) {
  return Send(new AutomationMsg_OpenNewBrowserWindow(0, show_command));
}

TabProxy* AutomationProxy::CreateExternalTab(HWND parent,
                                             const gfx::Rect& dimensions,
                                             unsigned int style,
                                             HWND* external_tab_container) {
  IPC::Message* response = NULL;
  int handle = 0;

  bool succeeded = 
      Send(new AutomationMsg_CreateExternalTab(0, parent, dimensions, style,
                                               external_tab_container,
                                               &handle));
  if (!succeeded) {
    return NULL;
  }

  DCHECK(IsWindow(*external_tab_container));

  return new TabProxy(this, tracker_.get(), handle);
}