/* ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is Mozilla libXUL embedding.
 *
 * The Initial Developer of the Original Code is
 * Benjamin Smedberg <benjamin@smedbergs.us>
 *
 * Portions created by the Initial Developer are Copyright (C) 2005
 * the Mozilla Foundation. All Rights Reserved.
 *
 * Contributor(s):
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either the GNU General Public License Version 2 or later (the "GPL"), or
 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the MPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the MPL, the GPL or the LGPL.
 *
 * ***** END LICENSE BLOCK ***** */

#include "nsXULAppAPI.h"

#include <stdlib.h>

#include "prenv.h"

#include "base/at_exit.h"
#include "base/command_line.h"
#include "base/message_loop.h"
#include "base/thread.h"
#include "chrome/common/child_process.h"

#include "nsIAppShell.h"
#include "nsIAppStartupNotifier.h"
#include "nsIDirectoryService.h"
#include "nsILocalFile.h"
#include "nsIToolkitChromeRegistry.h"
#include "nsIToolkitProfile.h"

#include "nsAppDirectoryServiceDefs.h"
#include "nsAppRunner.h"
#include "nsAutoRef.h"
#include "nsDirectoryServiceDefs.h"
#include "nsStaticComponents.h"
#include "nsString.h"
#include "nsThreadUtils.h"
#include "nsWidgetsCID.h"
#include "nsXREDirProvider.h"

#include "mozilla/ipc/GeckoChildProcessHost.h"
#include "mozilla/ipc/GeckoThread.h"
#include "ScopedXREEmbed.h"

#include "mozilla/plugins/PluginThreadChild.h"
#include "TabThread.h"

#include "mozilla/ipc/TestShellParent.h"
#include "mozilla/ipc/TestShellThread.h"
#include "mozilla/ipc/XPCShellEnvironment.h"
#include "mozilla/Monitor.h"

using mozilla::ipc::BrowserProcessSubThread;
using mozilla::ipc::GeckoChildProcessHost;
using mozilla::ipc::GeckoThread;
using mozilla::ipc::ScopedXREEmbed;

using mozilla::plugins::PluginThreadChild;
using mozilla::tabs::TabThread;
using mozilla::ipc::TestShellParent;
using mozilla::ipc::TestShellThread;
using mozilla::ipc::XPCShellEnvironment;

using mozilla::Monitor;
using mozilla::MonitorAutoEnter;

static NS_DEFINE_CID(kAppShellCID, NS_APPSHELL_CID);

void
XRE_GetStaticComponents(nsStaticModuleInfo const **aStaticComponents,
                        PRUint32 *aComponentCount)
{
  *aStaticComponents = kPStaticModules;
  *aComponentCount = kStaticModuleCount;
}

nsresult
XRE_LockProfileDirectory(nsILocalFile* aDirectory,
                         nsISupports* *aLockObject)
{
  nsCOMPtr<nsIProfileLock> lock;

  nsresult rv = NS_LockProfilePath(aDirectory, nsnull, nsnull,
                                   getter_AddRefs(lock));
  if (NS_SUCCEEDED(rv))
    NS_ADDREF(*aLockObject = lock);

  return rv;
}

static nsStaticModuleInfo *sCombined;
static PRInt32 sInitCounter;

nsresult
XRE_InitEmbedding(nsILocalFile *aLibXULDirectory,
                  nsILocalFile *aAppDirectory,
                  nsIDirectoryServiceProvider *aAppDirProvider,
                  nsStaticModuleInfo const *aStaticComponents,
                  PRUint32 aStaticComponentCount)
{
  // Initialize some globals to make nsXREDirProvider happy
  static char* kNullCommandLine[] = { nsnull };
  gArgv = kNullCommandLine;
  gArgc = 0;

  NS_ENSURE_ARG(aLibXULDirectory);

  if (++sInitCounter > 1) // XXXbsmedberg is this really the right solution?
    return NS_OK;

  if (!aAppDirectory)
    aAppDirectory = aLibXULDirectory;

  nsresult rv;

  new nsXREDirProvider; // This sets gDirServiceProvider
  if (!gDirServiceProvider)
    return NS_ERROR_OUT_OF_MEMORY;

  rv = gDirServiceProvider->Initialize(aAppDirectory, aLibXULDirectory,
                                       aAppDirProvider);
  if (NS_FAILED(rv))
    return rv;

  // Combine the toolkit static components and the app components.
  PRUint32 combinedCount = kStaticModuleCount + aStaticComponentCount;

  sCombined = new nsStaticModuleInfo[combinedCount];
  if (!sCombined)
    return NS_ERROR_OUT_OF_MEMORY;

  memcpy(sCombined, kPStaticModules,
         sizeof(nsStaticModuleInfo) * kStaticModuleCount);
  memcpy(sCombined + kStaticModuleCount, aStaticComponents,
         sizeof(nsStaticModuleInfo) * aStaticComponentCount);

  rv = NS_InitXPCOM3(nsnull, aAppDirectory, gDirServiceProvider,
                     sCombined, combinedCount);
  if (NS_FAILED(rv))
    return rv;

  // We do not need to autoregister components here. The CheckUpdateFile()
  // bits in NS_InitXPCOM3 check for an .autoreg file. If the app wants
  // to autoregister every time (for instance, if it's debug), it can do
  // so after we return from this function.

  nsCOMPtr<nsIObserver> startupNotifier
    (do_CreateInstance(NS_APPSTARTUPNOTIFIER_CONTRACTID));
  if (!startupNotifier)
    return NS_ERROR_FAILURE;

  startupNotifier->Observe(nsnull, APPSTARTUP_TOPIC, nsnull);

  return NS_OK;
}

void
XRE_NotifyProfile()
{
  NS_ASSERTION(gDirServiceProvider, "XRE_InitEmbedding was not called!");
  gDirServiceProvider->DoStartup();
}

void
XRE_TermEmbedding()
{
  if (--sInitCounter != 0)
    return;

  NS_ASSERTION(gDirServiceProvider,
               "XRE_TermEmbedding without XRE_InitEmbedding");

  gDirServiceProvider->DoShutdown();
  NS_ShutdownXPCOM(nsnull);
  delete [] sCombined;
  delete gDirServiceProvider;
}

const char*
XRE_ChildProcessTypeToString(GeckoChildProcessType aProcessType)
{
  return (aProcessType < GeckoChildProcess_End) ?
    kGeckoChildProcessTypeString[aProcessType] : nsnull;
}

GeckoChildProcessType
XRE_StringToChildProcessType(const char* aProcessTypeString)
{
  for (int i = 0;
       i < (int) NS_ARRAY_LENGTH(kGeckoChildProcessTypeString);
       ++i) {
    if (!strcmp(kGeckoChildProcessTypeString[i], aProcessTypeString)) {
      return static_cast<GeckoChildProcessType>(i);
    }
  }
  return GeckoChildProcess_Invalid;
}

nsresult
XRE_InitChildProcess(int aArgc,
                     char* aArgv[],
                     GeckoChildProcessType aProcess)
{
  NS_ENSURE_ARG_MIN(aArgc, 1);
  NS_ENSURE_ARG_POINTER(aArgv);
  NS_ENSURE_ARG_POINTER(aArgv[0]);

  if (PR_GetEnv("MOZ_DEBUG_CHILD_PROCESS")) {
#ifdef OS_POSIX
      printf("\n\nCHILDCHILDCHILDCHILD\n  debug me @%d\n\n", getpid());
      sleep(30);
#elif defined(OS_WIN)
      Sleep(30000);
#endif
  }

  base::AtExitManager exitManager;
  CommandLine::Init(aArgc, aArgv);
  MessageLoopForIO mainMessageLoop;

  {
    ChildThread* mainThread;

    switch (aProcess) {
    case GeckoChildProcess_Default:
      mainThread = new GeckoThread();
      break;

    case GeckoChildProcess_Plugin:
      mainThread = new PluginThreadChild();
      break;

    case GeckoChildProcess_Tab:
      mainThread = new TabThread();
      break;

    case GeckoChildProcess_TestShell:
      mainThread = new TestShellThread();
      break;

    default:
      NS_RUNTIMEABORT("Unknown main thread class");
    }

    ChildProcess process(mainThread);

    // Do IPC event loop
    MessageLoop::current()->Run();
  }

  return NS_OK;
}

namespace {

class MainFunctionRunnable : public nsRunnable
{
public:
  NS_DECL_NSIRUNNABLE

  MainFunctionRunnable(MainFunction aFunction,
                       void* aData)
  : mFunction(aFunction),
    mData(aData)
  { 
    NS_ASSERTION(aFunction, "Don't give me a null pointer!");
  }

private:
  MainFunction mFunction;
  void* mData;
};

} /* anonymous namespace */

NS_IMETHODIMP
MainFunctionRunnable::Run()
{
  mFunction(mData);
  return NS_OK;
}

nsresult
XRE_InitParentProcess(int aArgc,
                      char* aArgv[],
                      MainFunction aMainFunction,
                      void* aMainFunctionData)
{
  NS_ENSURE_ARG_MIN(aArgc, 1);
  NS_ENSURE_ARG_POINTER(aArgv);
  NS_ENSURE_ARG_POINTER(aArgv[0]);

  base::AtExitManager exitManager;
  CommandLine::Init(aArgc, aArgv);
  MessageLoopForUI mainMessageLoop;

  {
    // Make chromium's IPC thread
#if defined(OS_LINUX)
    // The lifetime of the BACKGROUND_X11 thread is a subset of the IO thread so
    // we start it now.
    scoped_ptr<base::Thread> x11Thread(
      new BrowserProcessSubThread(BrowserProcessSubThread::BACKGROUND_X11));
    if (NS_UNLIKELY(!x11Thread->Start())) {
      NS_ERROR("Failed to create chromium's X11 thread!");
      return NS_ERROR_FAILURE;
    }
#endif
    scoped_ptr<base::Thread> ipcThread(
      new BrowserProcessSubThread(BrowserProcessSubThread::IO));
    base::Thread::Options options;
    options.message_loop_type = MessageLoop::TYPE_IO;
    if (NS_UNLIKELY(!ipcThread->StartWithOptions(options))) {
      NS_ERROR("Failed to create chromium's IO thread!");
      return NS_ERROR_FAILURE;
    }

    ScopedXREEmbed embed;
    embed.Start();

    nsCOMPtr<nsIAppShell> appShell(do_GetService(kAppShellCID));
    NS_ENSURE_TRUE(appShell, NS_ERROR_FAILURE);

    if (aMainFunction) {
      nsCOMPtr<nsIRunnable> runnable =
        new MainFunctionRunnable(aMainFunction, aMainFunctionData);
      NS_ENSURE_TRUE(runnable, NS_ERROR_OUT_OF_MEMORY);

      nsresult rv = NS_DispatchToCurrentThread(runnable);
      NS_ENSURE_SUCCESS(rv, rv);
    }

    // Do event loop
    if (NS_FAILED(appShell->Run())) {
      NS_WARNING("Failed to run appshell");
      return NS_ERROR_FAILURE;
    }
  }

  return NS_OK;
}

NS_SPECIALIZE_TEMPLATE
class nsAutoRefTraits<XPCShellEnvironment> :
  public nsPointerRefTraits<XPCShellEnvironment>
{
public:
  void Release(XPCShellEnvironment* aEnv) {
    XPCShellEnvironment::DestroyEnvironment(aEnv);
  }
};

namespace {

class CreateChildProcess : public Task
{
public:
  CreateChildProcess(Monitor* aMonitor,
                     IPC::Channel** aChannelPtr)
  : mMonitor(aMonitor),
    mChannelPtr(aChannelPtr)
  {
    NS_ASSERTION(aMonitor, "Null ptr!");
  }

  virtual void Run() {
    GeckoChildProcessHost* host =
      new GeckoChildProcessHost(GeckoChildProcess_TestShell);
    if (host) {
      if (!host->Launch()) {
        delete host;
      }
      // ChildProcessHost deletes itself once the child process exits, on
      // windows at least...
      *mChannelPtr = host->GetChannel();
    }

    MonitorAutoEnter ae(*mMonitor);
    mMonitor->Notify();
  }

private:
  Monitor* mMonitor;
  IPC::Channel** mChannelPtr;
};

class QuitRunnable : public nsRunnable
{
public:
  NS_IMETHOD Run() {
    nsCOMPtr<nsIAppShell> appShell(do_GetService(kAppShellCID));
    NS_ENSURE_TRUE(appShell, NS_ERROR_FAILURE);

    return appShell->Exit();
  }
};

IPC::Channel*
LaunchTestShellChildProcess()
{
  Monitor mon("LaunchChildProcess monitor");

  IPC::Channel* channel = nsnull;

  CreateChildProcess* creator = new CreateChildProcess(&mon, &channel);
  NS_ENSURE_TRUE(creator, nsnull);

  MessageLoop* ioLoop = 
      BrowserProcessSubThread::GetMessageLoop(BrowserProcessSubThread::IO);
  NS_ENSURE_TRUE(ioLoop, nsnull);

  {
    MonitorAutoEnter ae(mon);

    ioLoop->PostTask(FROM_HERE, creator);
    mon.Wait();
  }

  return channel;
}

int
TestShellMain(int argc, char** argv)
{
  // Make sure we quit when we exit this function.
  nsIRunnable* quitRunnable = new QuitRunnable();
  NS_ENSURE_TRUE(quitRunnable, 1);

  nsresult rv = NS_DispatchToCurrentThread(quitRunnable);
  NS_ENSURE_SUCCESS(rv, 1);

  nsAutoRef<XPCShellEnvironment> env(XPCShellEnvironment::CreateEnvironment());
  NS_ENSURE_TRUE(env, 1);

  IPC::Channel* channel = LaunchTestShellChildProcess();
  NS_ENSURE_TRUE(channel, 1);

  TestShellParent testShellParent;
  if (!testShellParent.Open(channel)) {
    NS_WARNING("Failed to open channel!");
    return 1;
  }

  if (!env->DefineSendCommand(&testShellParent)) {
    NS_WARNING("DefineChildObject failed!");
    return 1;
  }

  const char* filename = argc > 1 ? argv[1] : nsnull;
  env->Process(filename);

  return env->ExitCode();
}

struct TestShellData {
  int* result;
  int argc;
  char** argv;
};

void
TestShellMainWrapper(void* aData)
{
  NS_ASSERTION(aData, "Don't give me a null pointer!");
  TestShellData& testShellData = *static_cast<TestShellData*>(aData);

  *testShellData.result =
    TestShellMain(testShellData.argc, testShellData.argv);
}

} /* anonymous namespace */

int
XRE_RunTestShell(int aArgc, char* aArgv[])
{
    int result;

    TestShellData data = { &result, aArgc, aArgv };

    nsresult rv =
      XRE_InitParentProcess(aArgc, aArgv, TestShellMainWrapper, &data);
    NS_ENSURE_SUCCESS(rv, 1);

    return result;
}