/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
 *
 * The contents of this file are subject to the Netscape 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/NPL/
 *
 * 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 Netscape are
 * Copyright (C) 1998 Netscape Communications Corporation. All
 * Rights Reserved.
 *
 * Contributor(s): 
 */

/*
	nsPluginsDirWin.cpp
	
	Windows implementation of the nsPluginsDir/nsPluginsFile classes.
	
	by Alex Musil
 */

#include "nsPluginsDir.h"
#include "prlink.h"
#include "plstr.h"
#include "prmem.h"

#include "windows.h"
#include "winbase.h"

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

/* Local helper functions */

static char* GetFileName(const char* pathname)
{
	const char* filename = nsnull;

	// this is most likely a path, so skip to the filename
	filename = PL_strrchr(pathname, '/');
	if(filename)
		++filename;
	else
		filename = pathname;

	return PL_strdup(filename);
}

static char* GetKeyValue(char* verbuf, char* key)
{
	char        *buf = NULL;
	UINT        blen;

	::VerQueryValue(verbuf,
					TEXT(key),
					(void **)&buf, &blen);

	if(buf != NULL)
		return PL_strdup(buf);
	else
		return nsnull;
}

static PRUint32 CalculateVariantCount(char* mimeTypes)
{
	PRUint32 variants = 1;

  if(mimeTypes == NULL)
    return 0;

	char* index = mimeTypes;
	while (*index)
	{
		if (*index == '|')
			variants++;

		++index;
	}
	return variants;
}

static char** MakeStringArray(PRUint32 variants, char* data)
{
	char** buffer = NULL;
	char* index = data;
	PRUint32 count = 0;
	
  if((variants == 0) || (data == NULL))
    return NULL;

	buffer = (char **)PR_Calloc(variants, sizeof(char *));
	if(!buffer)
	    return NULL;
	buffer[count] = index;
	++count;

	while (*index && count<variants)
	{
		if (*index == '|')
		{
		  buffer[count] = index + 1;
		  ++count;
		  *index = 0;
		}
		++index;
	}
	return buffer;
}

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

/* nsPluginsDir implementation */

nsPluginsDir::nsPluginsDir(PRUint16 location)
{
  DWORD pathlen; 
  char path[2000];
  const char* allocPath;

  if((location == PLUGINS_DIR_LOCATION_AUTO) || (location == PLUGINS_DIR_LOCATION_MOZ_LOCAL))
  {
    // look for a plugin folder that exists in the same directory as our executable
    if (::GetModuleFileName(NULL, path, sizeof(path)) > 0) 
    { 
      pathlen = PL_strlen(path) - 1; 

      while (pathlen > 0) 
      { 
        if (path[pathlen] == '\\') 
          break; 

        pathlen--; 
      }

      if (pathlen > 0) 
      { 
        PL_strcpy(&path[pathlen + 1], "plugins"); 

	      allocPath = path;
	      *(nsFileSpec*)this = allocPath;
      } 
    } 
  }

  if(((location == PLUGINS_DIR_LOCATION_AUTO) && !Exists()) || 
    (location == PLUGINS_DIR_LOCATION_4DOTX))
  {
    // look for the plugin folder that the user has in their Communicator 4x install
    HKEY keyloc; 
    long result;
    DWORD type; 
    char szKey[512] = "Software\\Netscape\\Netscape Navigator";

    path[0] = 0; 
    result = ::RegOpenKeyEx(HKEY_LOCAL_MACHINE, szKey, 0, KEY_READ, &keyloc); 

    if (result == ERROR_SUCCESS) 
    {
      char current_version[80];
      DWORD length = sizeof(current_version);

      result = ::RegQueryValueEx(keyloc, "CurrentVersion", NULL, &type, (LPBYTE)&current_version, &length); 

      ::RegCloseKey(keyloc);
      PL_strcat(szKey, "\\");
      PL_strcat(szKey, current_version);
      PL_strcat(szKey, "\\Main");
      result = ::RegOpenKeyEx(HKEY_LOCAL_MACHINE, szKey, 0, KEY_READ, &keyloc); 
    }

    if (result == ERROR_SUCCESS) 
    { 
      pathlen = sizeof(path); 

      result = ::RegQueryValueEx(keyloc, "Plugins Directory", NULL, &type, (LPBYTE)&path, &pathlen); 
      ::RegCloseKey(keyloc); 
    } 

	  allocPath = path;
	  *(nsFileSpec*)this = allocPath;
  }

#ifdef NS_DEBUG 
  if (path[0] != 0) 
    printf("plugins at: %s\n", path); 
#endif 
}

nsPluginsDir::~nsPluginsDir()
{
	// do nothing
}

PRBool nsPluginsDir::IsPluginFile(const nsFileSpec& fileSpec)
{
	const char* filename;
	char* extension;
	PRUint32 len;
	const char* pathname = fileSpec.GetCString();

	// this is most likely a path, so skip to the filename
	filename = PL_strrchr(pathname, '\\');
	if(filename)
		++filename;
	else
		filename = pathname;

	len = PL_strlen(filename);
	// the filename must be: "np*.dll"
	extension = PL_strrchr(filename, '.');
	if(extension)
	    ++extension;

	if(len > 5)
	{
		if(!PL_strncasecmp(filename, "np", 2) && !PL_strcasecmp(extension, "dll"))
			return PR_TRUE;
	}

	return PR_FALSE;
}

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

/* nsPluginFile implementation */

nsPluginFile::nsPluginFile(const nsFileSpec& spec)
	:	nsFileSpec(spec)
{
	// nada
}

nsPluginFile::~nsPluginFile()
{
	// nada
}

/**
 * Loads the plugin into memory using NSPR's shared-library loading
 * mechanism. Handles platform differences in loading shared libraries.
 */
nsresult nsPluginFile::LoadPlugin(PRLibrary* &outLibrary)
{
	// How can we convert to a full path names for using with NSPR?
	const char* path = this->GetCString();
  char* index;
  char* pluginFolderPath = PL_strdup(path);

  index = PL_strrchr(pluginFolderPath, '\\');
  *index = 0;

	BOOL restoreOrigDir = FALSE;
	char aOrigDir[MAX_PATH + 1];
	DWORD dwCheck = ::GetCurrentDirectory(sizeof(aOrigDir), aOrigDir);
	NS_ASSERTION(dwCheck <= MAX_PATH + 1, "Error in Loading plugin");

	if (dwCheck <= MAX_PATH + 1)
		{
		restoreOrigDir = ::SetCurrentDirectory(pluginFolderPath);
		NS_ASSERTION(restoreOrigDir, "Error in Loading plugin");
		}

	outLibrary = PR_LoadLibrary(path);

	if (restoreOrigDir)
		{
		BOOL bCheck = ::SetCurrentDirectory(aOrigDir);
		NS_ASSERTION(bCheck, "Error in Loading plugin");
		}

  PL_strfree(pluginFolderPath);

	return NS_OK;
}

/**
 * Obtains all of the information currently available for this plugin.
 */
nsresult nsPluginFile::GetPluginInfo(nsPluginInfo& info)
{
  nsresult res = NS_OK;
	DWORD zerome, versionsize;
	char* verbuf = nsnull;
	const char* path = this->GetCString();

  versionsize = ::GetFileVersionInfoSize((char*)path, &zerome);
	if (versionsize > 0)
		verbuf = (char *)PR_Malloc(versionsize);
	if(!verbuf)
		return NS_ERROR_OUT_OF_MEMORY;

	if(::GetFileVersionInfo((char*)path, NULL, versionsize, verbuf))
	{
		info.fName = GetKeyValue(verbuf, "\\StringFileInfo\\040904E4\\ProductName");
		info.fDescription = GetKeyValue(verbuf, "\\StringFileInfo\\040904E4\\FileDescription");

		info.fMimeType = GetKeyValue(verbuf, "\\StringFileInfo\\040904E4\\MIMEType");
		info.fMimeDescription = GetKeyValue(verbuf, "\\StringFileInfo\\040904E4\\FileOpenName");
		info.fExtensions = GetKeyValue(verbuf, "\\StringFileInfo\\040904E4\\FileExtents");

		info.fVariantCount = CalculateVariantCount(info.fMimeType);
		info.fMimeTypeArray = MakeStringArray(info.fVariantCount, info.fMimeType);
		info.fMimeDescriptionArray = MakeStringArray(info.fVariantCount, info.fMimeDescription);
		info.fExtensionArray = MakeStringArray(info.fVariantCount, info.fExtensions);
    info.fFileName = PL_strdup(path);
	}
	else
		res = NS_ERROR_FAILURE;


	PR_Free(verbuf);

  return res;
}

nsresult nsPluginFile::FreePluginInfo(nsPluginInfo& info)
{
  if(info.fName != nsnull)
    PL_strfree(info.fName);

  if(info.fDescription != nsnull)
    PL_strfree(info.fDescription);

  if(info.fMimeType != nsnull)
    PL_strfree(info.fMimeType);

  if(info.fMimeDescription != nsnull)
    PL_strfree(info.fMimeDescription);

  if(info.fExtensions != nsnull)
    PL_strfree(info.fExtensions);

  if(info.fMimeTypeArray != nsnull)
    PR_Free(info.fMimeTypeArray);

  if(info.fMimeDescriptionArray != nsnull)
    PR_Free(info.fMimeDescriptionArray);

  if(info.fExtensionArray != nsnull)
    PR_Free(info.fExtensionArray);

  ZeroMemory((void *)&info, sizeof(info));

  return NS_OK;
}