/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** 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.org code.
 *
 * The Initial Developer of the Original Code is
 * Netscape Communications Corporation.
 * Portions created by the Initial Developer are Copyright (C) 1998
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *   IBM Corp.
 *   Henry Sobotka
 *   Benjamin Smedberg <benjamin@smedbergs.us>
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either of 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 "nsDebugImpl.h"
#include "nsDebug.h"
#include "prprf.h"
#include "prlog.h"
#include "prinit.h"
#include "plstr.h"
#include "nsError.h"
#include "prerror.h"
#include "prerr.h"
#include "prenv.h"

#if defined(XP_BEOS)
/* For DEBUGGER macros */
#include <Debug.h>
#endif

#if defined(XP_UNIX) || defined(_WIN32) || defined(XP_OS2) || defined(XP_BEOS)
/* for abort() and getenv() */
#include <stdlib.h>
#endif

#include "nsTraceRefcntImpl.h"
#include "nsISupportsUtils.h"

#if defined(XP_UNIX)
#include <signal.h>
#endif

static void
Abort(const char *aMsg);

static void
Break(const char *aMsg);

#if defined(XP_OS2)
#  define INCL_WINDIALOGS  // need for WinMessageBox
#  include <os2.h>
#  include <string.h>
#endif /* XP_OS2 */

#if defined(_WIN32)
#include <windows.h>
#include <signal.h>
#include <malloc.h> // for _alloca
#elif defined(XP_UNIX)
#include <stdlib.h>
#endif

/*
 * Determine if debugger is present in windows.
 */
#if defined (_WIN32)

typedef WINBASEAPI BOOL (WINAPI* LPFNISDEBUGGERPRESENT)();
PRBool InDebugger()
{
#ifndef WINCE
   PRBool fReturn = PR_FALSE;
   LPFNISDEBUGGERPRESENT lpfnIsDebuggerPresent = NULL;
   HINSTANCE hKernel = LoadLibrary("Kernel32.dll");

   if(hKernel)
      {
      lpfnIsDebuggerPresent = 
         (LPFNISDEBUGGERPRESENT)GetProcAddress(hKernel, "IsDebuggerPresent");
      if(lpfnIsDebuggerPresent)
         {
         fReturn = (*lpfnIsDebuggerPresent)();
         }
      FreeLibrary(hKernel);
      }

   return fReturn;
#else
   return PR_FALSE;
#endif
}

#endif /* WIN32*/

NS_IMPL_QUERY_INTERFACE1(nsDebugImpl, nsIDebug)

NS_IMETHODIMP_(nsrefcnt)
nsDebugImpl::AddRef()
{
  return 2;
}

NS_IMETHODIMP_(nsrefcnt)
nsDebugImpl::Release()
{
  return 1;
}

NS_IMETHODIMP
nsDebugImpl::Assertion(const char *aStr, const char *aExpr,
                       const char *aFile, PRInt32 aLine)
{
  NS_DebugBreak(NS_DEBUG_ASSERTION, aStr, aExpr, aFile, aLine);
  return NS_OK;
}

NS_IMETHODIMP
nsDebugImpl::Warning(const char *aStr, const char *aFile, PRInt32 aLine)
{
  NS_DebugBreak(NS_DEBUG_WARNING, aStr, nsnull, aFile, aLine);
  return NS_OK;
}

NS_IMETHODIMP
nsDebugImpl::Break(const char *aFile, PRInt32 aLine)
{
  NS_DebugBreak(NS_DEBUG_BREAK, nsnull, nsnull, aFile, aLine);
  return NS_OK;
}

NS_IMETHODIMP
nsDebugImpl::Abort(const char *aFile, PRInt32 aLine)
{
  NS_DebugBreak(NS_DEBUG_ABORT, nsnull, nsnull, aFile, aLine);
  return NS_OK;
}

/**
 * Implementation of the nsDebug methods. Note that this code is
 * always compiled in, in case some other module that uses it is
 * compiled with debugging even if this library is not.
 */
static PRLogModuleInfo* gDebugLog;

static void InitLog(void)
{
  if (0 == gDebugLog) {
    gDebugLog = PR_NewLogModule("nsDebug");
    gDebugLog->level = PR_LOG_DEBUG;
  }
}

enum nsAssertBehavior {
  NS_ASSERT_UNINITIALIZED,
  NS_ASSERT_WARN,
  NS_ASSERT_SUSPEND,
  NS_ASSERT_STACK,
  NS_ASSERT_TRAP,
  NS_ASSERT_ABORT
};

static nsAssertBehavior GetAssertBehavior()
{
  static nsAssertBehavior gAssertBehavior = NS_ASSERT_UNINITIALIZED;
  if (gAssertBehavior != NS_ASSERT_UNINITIALIZED)
    return gAssertBehavior;

#if defined(XP_WIN) || defined(XP_OS2)
  gAssertBehavior = NS_ASSERT_TRAP;
#else
  gAssertBehavior = NS_ASSERT_WARN;
#endif

  const char *assertString = PR_GetEnv("XPCOM_DEBUG_BREAK");
  if (!assertString || !*assertString)
    return gAssertBehavior;

   if (!strcmp(assertString, "warn"))
     return gAssertBehavior = NS_ASSERT_WARN;

   if (!strcmp(assertString, "suspend"))
     return gAssertBehavior = NS_ASSERT_SUSPEND;

   if (!strcmp(assertString, "stack"))
     return gAssertBehavior = NS_ASSERT_STACK;

   if (!strcmp(assertString, "abort"))
     return gAssertBehavior = NS_ASSERT_ABORT;

   if (!strcmp(assertString, "trap") || !strcmp(assertString, "break"))
     return gAssertBehavior = NS_ASSERT_TRAP;

   fprintf(stderr, "Unrecognized value of XPCOM_DEBUG_BREAK\n");
   return gAssertBehavior;
}

struct FixedBuffer
{
  FixedBuffer() : curlen(0) { buffer[0] = '\0'; }

  char buffer[1000];
  PRUint32 curlen;
};

static PRIntn
StuffFixedBuffer(void *closure, const char *buf, PRUint32 len)
{
  if (!len)
    return 0;
  
  FixedBuffer *fb = (FixedBuffer*) closure;

  // strip the trailing null, we add it again later
  if (buf[len - 1] == '\0')
    --len;

  if (fb->curlen + len >= sizeof(fb->buffer))
    len = sizeof(fb->buffer) - fb->curlen - 1;

  if (len) {
    memcpy(fb->buffer + fb->curlen, buf, len);
    fb->curlen += len;
    fb->buffer[fb->curlen] = '\0';
  }

  return len;
}

EXPORT_XPCOM_API(void)
NS_DebugBreak(PRUint32 aSeverity, const char *aStr, const char *aExpr,
              const char *aFile, PRInt32 aLine)
{
   InitLog();

   FixedBuffer buf;
   PRLogModuleLevel ll = PR_LOG_WARNING;
   const char *sevString = "WARNING";

   switch (aSeverity) {
   case NS_DEBUG_ASSERTION:
     sevString = "###!!! ASSERTION";
     ll = PR_LOG_ERROR;
     break;

   case NS_DEBUG_BREAK:
     sevString = "###!!! BREAK";
     ll = PR_LOG_ALWAYS;
     break;

   case NS_DEBUG_ABORT:
     sevString = "###!!! ABORT";
     ll = PR_LOG_ALWAYS;
     break;

   default:
     aSeverity = NS_DEBUG_WARNING;
   };

   PR_sxprintf(StuffFixedBuffer, &buf, "%s: ", sevString);

   if (aStr)
     PR_sxprintf(StuffFixedBuffer, &buf, "%s: ", aStr);

   if (aExpr)
     PR_sxprintf(StuffFixedBuffer, &buf, "'%s', ", aExpr);

   if (aFile)
     PR_sxprintf(StuffFixedBuffer, &buf, "file %s, ", aFile);

   if (aLine != -1)
     PR_sxprintf(StuffFixedBuffer, &buf, "line %d", aLine);

   // Write out the message to the debug log
   PR_LOG(gDebugLog, ll, ("%s", buf.buffer));
   PR_LogFlush();

   // errors on platforms without a debugdlg ring a bell on stderr
#if !defined(XP_WIN) && !defined(XP_OS2)
   if (ll != PR_LOG_WARNING)
     fprintf(stderr, "\07");
#endif

   // Write the message to stderr
   fprintf(stderr, "%s\n", buf.buffer);
   fflush(stderr);

   switch (aSeverity) {
   case NS_DEBUG_WARNING:
     return;

   case NS_DEBUG_BREAK:
     Break(buf.buffer);
     return;

   case NS_DEBUG_ABORT:
     Abort(buf.buffer);
     return;
   }

   // Now we deal with assertions

   switch (GetAssertBehavior()) {
   case NS_ASSERT_WARN:
     return;

   case NS_ASSERT_SUSPEND:
#ifdef XP_UNIX
      fprintf(stderr, "Suspending process; attach with the debugger.\n");
      kill(0, SIGSTOP);
#else
      Break(buf.buffer);
#endif
      return;

   case NS_ASSERT_STACK:
     nsTraceRefcntImpl::WalkTheStack(stderr);
     return;

   case NS_ASSERT_ABORT:
     Abort(buf.buffer);
     return;

   case NS_ASSERT_TRAP:
     Break(buf.buffer);
   }   
}

static void
Abort(const char *aMsg)
{
#if defined(_WIN32)
  //This should exit us
  raise(SIGABRT);
  //If we are ignored exit this way..
  _exit(3);
#elif defined(XP_UNIX)
  PR_Abort();
#elif defined(XP_BEOS)
  {
#ifndef DEBUG_cls
	DEBUGGER(aMsg);
#endif
  }
#else
  // Don't know how to abort on this platform! call Break() instead
  Break(aMsg);
#endif
}

// Abort() calls this function, don't call it!
static void
Break(const char *aMsg)
{
#if defined(_WIN32)
#ifndef WINCE // we really just want to crash for now
  static int ignoreDebugger;
  if (!ignoreDebugger) {
    const char *shouldIgnoreDebugger = getenv("XPCOM_DEBUG_DLG");
    ignoreDebugger = 1 + (shouldIgnoreDebugger && !strcmp(shouldIgnoreDebugger, "1"));
  }
  if((ignoreDebugger == 2) || !InDebugger()) {
    DWORD code = IDRETRY;

    /* Create the debug dialog out of process to avoid the crashes caused by 
     * Windows events leaking into our event loop from an in process dialog.
     * We do this by launching windbgdlg.exe (built in xpcom/windbgdlg).
     * See http://bugzilla.mozilla.org/show_bug.cgi?id=54792
     */
    PROCESS_INFORMATION pi;
    STARTUPINFO si;
    char executable[MAX_PATH];
    char* pName;

    memset(&pi, 0, sizeof(pi));

    memset(&si, 0, sizeof(si));
    si.cb          = sizeof(si);
    si.wShowWindow = SW_SHOW;

    // 2nd arg of CreateProcess is in/out
    char *msgCopy = (char*) _alloca(strlen(aMsg) + 1); 
    strcpy(msgCopy, aMsg);

    if(GetModuleFileName(GetModuleHandle("xpcom.dll"), executable, MAX_PATH) &&
       NULL != (pName = strrchr(executable, '\\')) &&
       NULL != strcpy(pName+1, "windbgdlg.exe") &&
       CreateProcess(executable, msgCopy, NULL, NULL, PR_FALSE,
                     DETACHED_PROCESS | NORMAL_PRIORITY_CLASS,
                     NULL, NULL, &si, &pi)) {
      WaitForSingleObject(pi.hProcess, INFINITE);
      GetExitCodeProcess(pi.hProcess, &code);
      CloseHandle(pi.hProcess);
      CloseHandle(pi.hThread);
    }

    switch(code) {
    case IDABORT:
      //This should exit us
      raise(SIGABRT);
      //If we are ignored exit this way..
      _exit(3);
         
    case IDIGNORE:
      return;
    }
  }

  ::DebugBreak();

#endif // WINCE
#elif defined(XP_OS2)
   char msg[1200];
   PR_snprintf(msg, sizeof(msg),
               "%s\n\nClick Cancel to Debug Application.\n"
               "Click Enter to continue running the Application.", aMsg);
   ULONG code = MBID_ERROR;
   code = WinMessageBox(HWND_DESKTOP, HWND_DESKTOP, msg, 
                        "NSGlue_Assertion", 0,
                        MB_ERROR | MB_ENTERCANCEL);

   /* It is possible that we are executing on a thread that doesn't have a
    * message queue.  In that case, the message won't appear, and code will
    * be 0xFFFF.  We'll give the user a chance to debug it by calling
    * Break()
    * Actually, that's a really bad idea since this happens a lot with threadsafe
    * assertions and since it means that you can't actually run the debug build
    * outside a debugger without it crashing constantly.
    */
   if (( code == MBID_ENTER ) || (code == MBID_ERROR))
     return;

   asm("int $3");
#elif defined(XP_BEOS)
   DEBUGGER(aMsg);
#elif defined(XP_MACOSX)
   /* Note that we put this Mac OS X test above the GNUC/x86 test because the
    * GNUC/x86 test is also true on Intel Mac OS X and we want the PPC/x86
    * impls to be the same.
    */
   raise(SIGTRAP);
#elif defined(__GNUC__) && (defined(__i386__) || defined(__i386) || defined(__x86_64__))
   asm("int $3");
#else
   // don't know how to break on this platform
#endif
}

static const nsDebugImpl kImpl;

NS_METHOD
nsDebugImpl::Create(nsISupports* outer, const nsIID& aIID, void* *aInstancePtr)
{
  NS_ENSURE_NO_AGGREGATION(outer);

  return const_cast<nsDebugImpl*>(&kImpl)->
    QueryInterface(aIID, aInstancePtr);
}

////////////////////////////////////////////////////////////////////////////////

NS_COM nsresult
NS_ErrorAccordingToNSPR()
{
    PRErrorCode err = PR_GetError();
    switch (err) {
      case PR_OUT_OF_MEMORY_ERROR:              return NS_ERROR_OUT_OF_MEMORY;
      case PR_WOULD_BLOCK_ERROR:                return NS_BASE_STREAM_WOULD_BLOCK;
      case PR_FILE_NOT_FOUND_ERROR:             return NS_ERROR_FILE_NOT_FOUND;
      case PR_READ_ONLY_FILESYSTEM_ERROR:       return NS_ERROR_FILE_READ_ONLY;
      case PR_NOT_DIRECTORY_ERROR:              return NS_ERROR_FILE_NOT_DIRECTORY;
      case PR_IS_DIRECTORY_ERROR:               return NS_ERROR_FILE_IS_DIRECTORY;
      case PR_LOOP_ERROR:                       return NS_ERROR_FILE_UNRESOLVABLE_SYMLINK;
      case PR_FILE_EXISTS_ERROR:                return NS_ERROR_FILE_ALREADY_EXISTS;
      case PR_FILE_IS_LOCKED_ERROR:             return NS_ERROR_FILE_IS_LOCKED;
      case PR_FILE_TOO_BIG_ERROR:               return NS_ERROR_FILE_TOO_BIG;
      case PR_NO_DEVICE_SPACE_ERROR:            return NS_ERROR_FILE_NO_DEVICE_SPACE;
      case PR_NAME_TOO_LONG_ERROR:              return NS_ERROR_FILE_NAME_TOO_LONG;
      case PR_DIRECTORY_NOT_EMPTY_ERROR:        return NS_ERROR_FILE_DIR_NOT_EMPTY;
      case PR_NO_ACCESS_RIGHTS_ERROR:           return NS_ERROR_FILE_ACCESS_DENIED;
      default:                                  return NS_ERROR_FAILURE;
    }
}

////////////////////////////////////////////////////////////////////////////////