/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim:expandtab:shiftwidth=2:tabstop=8:
 */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "nsGTKRemoteService.h"
#ifdef MOZ_ENABLE_DBUS
#  include "nsDBusRemoteService.h"
#endif
#include "nsRemoteService.h"

#include <gtk/gtk.h>
#include <gdk/gdk.h>
#include <gdk/gdkx.h>

#include "nsIServiceManager.h"
#include "nsIAppShellService.h"
#include "nsAppShellCID.h"
#include "nsInterfaceHashtable.h"
#include "nsGTKToolkit.h"
#include "nsICommandLineRunner.h"
#include "nsCommandLine.h"
#include "nsString.h"
#include "nsIFile.h"

NS_IMPL_ISUPPORTS(nsRemoteService, nsIRemoteService, nsIObserver)

NS_IMETHODIMP
nsRemoteService::Startup(const char* aAppName, const char* aProfileName) {
  bool useX11Remote = GDK_IS_X11_DISPLAY(gdk_display_get_default());

#if defined(MOZ_ENABLE_DBUS)
  if (!useX11Remote) {
    nsresult rv;
    mDBusRemoteService = new nsDBusRemoteService();
    rv = mDBusRemoteService->Startup(aAppName, aProfileName);
    if (NS_FAILED(rv)) {
      mDBusRemoteService = nullptr;
    }
  }
#endif
  if (useX11Remote) {
    mGtkRemoteService = new nsGTKRemoteService();
    mGtkRemoteService->Startup(aAppName, aProfileName);
  }

  if (!mDBusRemoteService && !mGtkRemoteService) return NS_ERROR_FAILURE;

  nsCOMPtr<nsIObserverService> obs(
      do_GetService("@mozilla.org/observer-service;1"));
  if (obs) {
    obs->AddObserver(this, "xpcom-shutdown", false);
    obs->AddObserver(this, "quit-application", false);
  }

  return NS_OK;
}

NS_IMETHODIMP
nsRemoteService::Shutdown() {
#if defined(MOZ_ENABLE_DBUS)
  if (mDBusRemoteService) {
    mDBusRemoteService->Shutdown();
    mDBusRemoteService = nullptr;
  }
#endif
  if (mGtkRemoteService) {
    mGtkRemoteService->Shutdown();
    mGtkRemoteService = nullptr;
  }
  return NS_OK;
}

nsRemoteService::~nsRemoteService() { Shutdown(); }

NS_IMETHODIMP
nsRemoteService::Observe(nsISupports* aSubject, const char* aTopic,
                         const char16_t* aData) {
  // This can be xpcom-shutdown or quit-application, but it's the same either
  // way.
  Shutdown();
  return NS_OK;
}

// Set desktop startup ID to the passed ID, if there is one, so that any created
// windows get created with the right window manager metadata, and any windows
// that get new tabs and are activated also get the right WM metadata.
// The timestamp will be used if there is no desktop startup ID, or if we're
// raising an existing window rather than showing a new window for the first
// time.
void nsRemoteService::SetDesktopStartupIDOrTimestamp(
    const nsACString& aDesktopStartupID, uint32_t aTimestamp) {
  nsGTKToolkit* toolkit = nsGTKToolkit::GetToolkit();
  if (!toolkit) return;

  if (!aDesktopStartupID.IsEmpty()) {
    toolkit->SetDesktopStartupID(aDesktopStartupID);
  }

  toolkit->SetFocusTimestamp(aTimestamp);
}

static bool FindExtensionParameterInCommand(const char* aParameterName,
                                            const nsACString& aCommand,
                                            char aSeparator,
                                            nsACString* aValue) {
  nsAutoCString searchFor;
  searchFor.Append(aSeparator);
  searchFor.Append(aParameterName);
  searchFor.Append('=');

  nsACString::const_iterator start, end;
  aCommand.BeginReading(start);
  aCommand.EndReading(end);
  if (!FindInReadable(searchFor, start, end)) return false;

  nsACString::const_iterator charStart, charEnd;
  charStart = end;
  aCommand.EndReading(charEnd);
  nsACString::const_iterator idStart = charStart, idEnd;
  if (FindCharInReadable(aSeparator, charStart, charEnd)) {
    idEnd = charStart;
  } else {
    idEnd = charEnd;
  }
  *aValue = nsDependentCSubstring(idStart, idEnd);
  return true;
}

const char* nsRemoteService::HandleCommandLine(const char* aBuffer,
                                               uint32_t aTimestamp) {
  nsCOMPtr<nsICommandLineRunner> cmdline(new nsCommandLine());

  // the commandline property is constructed as an array of int32_t
  // followed by a series of null-terminated strings:
  //
  // [argc][offsetargv0][offsetargv1...]<workingdir>\0<argv[0]>\0argv[1]...\0
  // (offset is from the beginning of the buffer)

  int32_t argc = TO_LITTLE_ENDIAN32(*reinterpret_cast<const int32_t*>(aBuffer));
  const char* wd = aBuffer + ((argc + 1) * sizeof(int32_t));

  nsCOMPtr<nsIFile> lf;
  nsresult rv =
      NS_NewNativeLocalFile(nsDependentCString(wd), true, getter_AddRefs(lf));
  if (NS_FAILED(rv)) return "509 internal error";

  nsAutoCString desktopStartupID;

  const char** argv = (const char**)malloc(sizeof(char*) * argc);
  if (!argv) return "509 internal error";

  const int32_t* offset = reinterpret_cast<const int32_t*>(aBuffer) + 1;

  for (int i = 0; i < argc; ++i) {
    argv[i] = aBuffer + TO_LITTLE_ENDIAN32(offset[i]);

    if (i == 0) {
      nsDependentCString cmd(argv[0]);
      FindExtensionParameterInCommand("DESKTOP_STARTUP_ID", cmd, ' ',
                                      &desktopStartupID);
    }
  }

  rv = cmdline->Init(argc, argv, lf, nsICommandLine::STATE_REMOTE_AUTO);

  free(argv);
  if (NS_FAILED(rv)) {
    return "509 internal error";
  }

  SetDesktopStartupIDOrTimestamp(desktopStartupID, aTimestamp);

  rv = cmdline->Run();

  if (NS_ERROR_ABORT == rv) return "500 command not parseable";

  if (NS_FAILED(rv)) return "509 internal error";

  return "200 executed command";
}