/* 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 "nsXPCOMGlue.h"
#include "nsINIParser.h"
#include "nsXPCOMPrivate.h" // for XP MAXPATHLEN
#include "nsXULAppAPI.h"
#include "nsIFile.h"

#include <stdarg.h>

#ifdef XP_WIN
#include <windows.h>
#include <io.h>
#define snprintf _snprintf
#define vsnprintf _vsnprintf
#define strcasecmp _stricmp
#define PATH_SEPARATOR_CHAR '\\'
#define R_OK 04
#elif defined(XP_MACOSX)
#include <unistd.h>
#include <sys/stat.h>
#include <CoreFoundation/CoreFoundation.h>
#define PATH_SEPARATOR_CHAR '/'
#else
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#define PATH_SEPARATOR_CHAR '/'
#endif

#ifdef XP_WIN
#define XRE_DONT_PROTECT_DLL_LOAD
#include "nsWindowsWMain.cpp"
#endif

#define VERSION_MAXLEN 128

static void Output(bool isError, const char *fmt, ... )
{
  va_list ap;
  va_start(ap, fmt);

#if (defined(XP_WIN) && !MOZ_WINCONSOLE)
  char msg[2048];

  vsnprintf(msg, sizeof(msg), fmt, ap);

  UINT flags = MB_OK;
  if (isError)
    flags |= MB_ICONERROR;
  else
    flags |= MB_ICONINFORMATION;

  wchar_t wide_msg[1024];
  MultiByteToWideChar(CP_ACP,
		      0,
		      msg,
		      -1,
		      wide_msg,
		      sizeof(wide_msg) / sizeof(wchar_t));
  
  MessageBoxW(nullptr, wide_msg, L"XULRunner", flags);
#else
  vfprintf(stderr, fmt, ap);
#endif

  va_end(ap);
}

/**
 * Return true if |arg| matches the given argument name.
 */
static bool IsArg(const char* arg, const char* s)
{
  if (*arg == '-')
  {
    if (*++arg == '-')
      ++arg;
    return !strcasecmp(arg, s);
  }

#if defined(XP_WIN)
  if (*arg == '/')
    return !strcasecmp(++arg, s);
#endif

  return false;
}

/**
 * Return true if |aDir| is a valid file/directory.
 */
static bool FolderExists(const char* aDir)
{
#ifdef XP_WIN
  wchar_t wideDir[MAX_PATH];
  MultiByteToWideChar(CP_UTF8, 0, aDir, -1, wideDir, MAX_PATH);
  DWORD fileAttrs = GetFileAttributesW(wideDir);
  return fileAttrs != INVALID_FILE_ATTRIBUTES;
#else
  return access(aDir, R_OK) == 0;
#endif
}

static nsresult GetRealPath(const char* appDataFile, char* *aResult)
{
#ifdef XP_WIN
  wchar_t wAppDataFile[MAX_PATH];
  wchar_t wIniPath[MAX_PATH];
  MultiByteToWideChar(CP_UTF8, 0, appDataFile, -1, wAppDataFile, MAX_PATH);
  _wfullpath(wIniPath, wAppDataFile, MAX_PATH);
  WideCharToMultiByte(CP_UTF8, 0, wIniPath, -1, *aResult, MAX_PATH, 0, 0);
#else
  struct stat fileStat;
  if (!realpath(appDataFile, *aResult) || stat(*aResult, &fileStat))
    return NS_ERROR_FAILURE;
#endif
  if (!*aResult || !**aResult)
    return NS_ERROR_FAILURE;

  return NS_OK;
}

class AutoAppData
{
public:
  AutoAppData(nsIFile* aINIFile) : mAppData(nullptr) {
    nsresult rv = XRE_CreateAppData(aINIFile, &mAppData);
    if (NS_FAILED(rv))
      mAppData = nullptr;
  }
  ~AutoAppData() {
    if (mAppData)
      XRE_FreeAppData(mAppData);
  }

  operator nsXREAppData*() const { return mAppData; }
  nsXREAppData* operator -> () const { return mAppData; }

private:
  nsXREAppData* mAppData;
};

XRE_CreateAppDataType XRE_CreateAppData;
XRE_FreeAppDataType XRE_FreeAppData;
XRE_mainType XRE_main;

int
main(int argc, char **argv)
{
  nsresult rv;
  char *lastSlash;

  char iniPath[MAXPATHLEN];
  char tmpPath[MAXPATHLEN];
  char greDir[MAXPATHLEN];
  bool greFound = false;

#if defined(XP_MACOSX)
  CFBundleRef appBundle = CFBundleGetMainBundle();
  if (!appBundle)
    return 1;

  CFURLRef resourcesURL = CFBundleCopyResourcesDirectoryURL(appBundle);
  if (!resourcesURL)
    return 1;

  CFURLRef absResourcesURL = CFURLCopyAbsoluteURL(resourcesURL);
  CFRelease(resourcesURL);
  if (!absResourcesURL)
    return 1;

  CFURLRef iniFileURL =
    CFURLCreateCopyAppendingPathComponent(kCFAllocatorDefault,
                                          absResourcesURL,
                                          CFSTR("application.ini"),
                                          false);
  CFRelease(absResourcesURL);
  if (!iniFileURL)
    return 1;

  CFStringRef iniPathStr =
    CFURLCopyFileSystemPath(iniFileURL, kCFURLPOSIXPathStyle);
  CFRelease(iniFileURL);
  if (!iniPathStr)
    return 1;

  CFStringGetCString(iniPathStr, iniPath, sizeof(iniPath),
                     kCFStringEncodingUTF8);
  CFRelease(iniPathStr);

#else

#ifdef XP_WIN
  wchar_t wide_path[MAX_PATH];
  if (!::GetModuleFileNameW(nullptr, wide_path, MAX_PATH))
    return 1;

  WideCharToMultiByte(CP_UTF8, 0, wide_path,-1,
		      iniPath, MAX_PATH, nullptr, nullptr);

#else
  // on unix, there is no official way to get the path of the current binary.
  // instead of using the MOZILLA_FIVE_HOME hack, which doesn't scale to
  // multiple applications, we will try a series of techniques:
  //
  // 1) use realpath() on argv[0], which works unless we're loaded from the
  //    PATH
  // 2) manually walk through the PATH and look for ourself
  // 3) give up

  struct stat fileStat;
  strncpy(tmpPath, argv[0], sizeof(tmpPath));
  lastSlash = strrchr(tmpPath, '/');
  if (lastSlash) {
    *lastSlash = 0;
    realpath(tmpPath, iniPath);
  } else {
    const char *path = getenv("PATH");
    if (!path)
      return 1;

    char *pathdup = strdup(path);
    if (!pathdup)
      return 1;

    bool found = false;
    char *token = strtok(pathdup, ":");
    while (token) {
      sprintf(tmpPath, "%s/%s", token, argv[0]);
      if (stat(tmpPath, &fileStat) == 0) {
        found = true;
        lastSlash = strrchr(tmpPath, '/');
        *lastSlash = 0;
        realpath(tmpPath, iniPath);
        break;
      }
      token = strtok(nullptr, ":");
    }
    free (pathdup);
    if (!found)
      return 1;
  }
  lastSlash = iniPath + strlen(iniPath);
  *lastSlash = '/';
#endif

#ifndef XP_UNIX
  lastSlash = strrchr(iniPath, PATH_SEPARATOR_CHAR);
  if (!lastSlash)
    return 1;
#endif

  *(++lastSlash) = '\0';

  // On Linux/Win, look for XULRunner in appdir/xulrunner

  snprintf(greDir, sizeof(greDir),
           "%sxulrunner" XPCOM_FILE_PATH_SEPARATOR XPCOM_DLL,
           iniPath);

  greFound = FolderExists(greDir);

#ifdef XP_UNIX
  if (greFound) {
    char resolved_greDir[MAXPATHLEN] = "";
    if (realpath(greDir, resolved_greDir) && *resolved_greDir) {
      strncpy(greDir, resolved_greDir, MAXPATHLEN);
    }
  }
#endif

  strncpy(lastSlash, "application.ini", sizeof(iniPath) - (lastSlash - iniPath));

#endif

  // If -app parameter was passed in, it is now time to take it under 
  // consideration.
  const char *appDataFile;
  appDataFile = getenv("XUL_APP_FILE");
  if (!appDataFile || !*appDataFile) 
    if (argc > 1 && IsArg(argv[1], "app")) {
      if (argc == 2) {
        Output(false, "specify APP-FILE (optional)\n");
        return 1;
      }
      argv[1] = argv[0];
      ++argv;
      --argc;

      appDataFile = argv[1];
      argv[1] = argv[0];
      ++argv;
      --argc;

      char kAppEnv[MAXPATHLEN];
      snprintf(kAppEnv, MAXPATHLEN, "XUL_APP_FILE=%s", appDataFile);
      if (putenv(kAppEnv)) 
        Output(false, "Couldn't set %s.\n", kAppEnv);

      char *result = (char*) calloc(sizeof(char), MAXPATHLEN);
      if (NS_FAILED(GetRealPath(appDataFile, &result))) {
        Output(true, "Invalid application.ini path.\n");
        return 1;
      }
      
      // We have a valid application.ini path passed in to the -app parameter 
      // but not yet a valid greDir, so lets look for it also on the same folder
      // as the stub.
      if (!greFound) {
        lastSlash = strrchr(iniPath, PATH_SEPARATOR_CHAR);
        if (!lastSlash)
          return 1;

        *(++lastSlash) = '\0';

        snprintf(greDir, sizeof(greDir), "%s" XPCOM_DLL, iniPath);
        greFound = FolderExists(greDir);
      }
      
      // copy it back.
      strcpy(iniPath, result);
    }
  
  nsINIParser parser;
  rv = parser.Init(iniPath);
  if (NS_FAILED(rv)) {
    fprintf(stderr, "Could not read application.ini\n");
    return 1;
  }

  if (!greFound) {
#ifdef XP_MACOSX
    // Check for <bundle>/Contents/Frameworks/XUL.framework/Versions/Current/libmozglue.dylib
    CFURLRef fwurl = CFBundleCopyPrivateFrameworksURL(appBundle);
    CFURLRef absfwurl = nullptr;
    if (fwurl) {
      absfwurl = CFURLCopyAbsoluteURL(fwurl);
      CFRelease(fwurl);
    }

    if (absfwurl) {
      CFURLRef xulurl =
        CFURLCreateCopyAppendingPathComponent(nullptr, absfwurl,
                                              CFSTR("XUL.framework/Versions/Current"),
                                              true);

      if (xulurl) {
        CFURLRef xpcomurl =
          CFURLCreateCopyAppendingPathComponent(nullptr, xulurl,
                                                CFSTR("libmozglue.dylib"),
                                                false);

        if (xpcomurl) {
          char tbuffer[MAXPATHLEN];

          if (CFURLGetFileSystemRepresentation(xpcomurl, true,
                                               (UInt8*) tbuffer,
                                               sizeof(tbuffer)) &&
              access(tbuffer, R_OK | X_OK) == 0) {
            if (realpath(tbuffer, greDir)) {
              greFound = true;
            }
            else {
              greDir[0] = '\0';
            }
          }

          CFRelease(xpcomurl);
        }

        CFRelease(xulurl);
      }

      CFRelease(absfwurl);
    }
#endif
    if (!greFound) {
      Output(false, "Could not find the Mozilla runtime.\n");
      return 1;
    }
  }

  rv = XPCOMGlueStartup(greDir);
  if (NS_FAILED(rv)) {
    if (rv == NS_ERROR_OUT_OF_MEMORY) {
      char applicationName[2000] = "this application";
      parser.GetString("App", "Name", applicationName, sizeof(applicationName));
      Output(true, "Not enough memory available to start %s.\n",
             applicationName);
    } else {
      Output(true, "Couldn't load XPCOM.\n");
    }
    return 1;
  }

  static const nsDynamicFunctionLoad kXULFuncs[] = {
    { "XRE_CreateAppData", (NSFuncPtr*) &XRE_CreateAppData },
    { "XRE_FreeAppData", (NSFuncPtr*) &XRE_FreeAppData },
    { "XRE_main", (NSFuncPtr*) &XRE_main },
    { nullptr, nullptr }
  };

  rv = XPCOMGlueLoadXULFunctions(kXULFuncs);
  if (NS_FAILED(rv)) {
    Output(true, "Couldn't load XRE functions.\n");
    return 1;
  }

  NS_LogInit();

  int retval;

  { // Scope COMPtr and AutoAppData
    nsCOMPtr<nsIFile> iniFile;
#ifdef XP_WIN
    // On Windows iniPath is UTF-8 encoded so we need to convert it.
    rv = NS_NewLocalFile(NS_ConvertUTF8toUTF16(iniPath), false,
                         getter_AddRefs(iniFile));
#else
    rv = NS_NewNativeLocalFile(nsDependentCString(iniPath), false,
                               getter_AddRefs(iniFile));
#endif
    if (NS_FAILED(rv)) {
      Output(true, "Couldn't find application.ini file.\n");
      return 1;
    }

    AutoAppData appData(iniFile);
    if (!appData) {
      Output(true, "Error: couldn't parse application.ini.\n");
      return 1;
    }

    NS_ASSERTION(appData->directory, "Failed to get app directory.");

    if (!appData->xreDirectory) {
      // chop "libxul.so" off the GRE path
      lastSlash = strrchr(greDir, PATH_SEPARATOR_CHAR);
      if (lastSlash) {
        *lastSlash = '\0';
      }
#ifdef XP_WIN
      // same as iniPath.
      NS_NewLocalFile(NS_ConvertUTF8toUTF16(greDir), false,
                      &appData->xreDirectory);
#else
      NS_NewNativeLocalFile(nsDependentCString(greDir), false,
                            &appData->xreDirectory);
#endif
    }

    retval = XRE_main(argc, argv, appData, 0);
  }

  NS_LogTerm();

  return retval;
}