/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
 *
 * 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 the Mozilla browser.
 * 
 * The Initial Developer of the Original Code is Netscape
 * Communications Corporation. Portions created by Netscape are
 * Copyright (C) 2000 Netscape Communications Corporation. All
 * Rights Reserved.
 * 
 * Contributor(s):
 *   Stuart Parmenter <pavlov@netscape.com>
 */

// Define so header files for openfilename are included
#ifdef WIN32_LEAN_AND_MEAN
#undef WIN32_LEAN_AND_MEAN
#endif

#include "nsCOMPtr.h"
#include "nsReadableUtils.h"
#include "nsNetUtil.h"
#include "nsIServiceManager.h"
#define NS_IMPL_IDS
#include "nsIPlatformCharset.h"
#undef NS_IMPL_IDS
#include "nsFilePicker.h"
#include "nsILocalFile.h"
#include "nsIFileChannel.h"
#include "nsIURL.h"
#include "nsIStringBundle.h"
#include <windows.h>
#include <SHLOBJ.H>

static NS_DEFINE_CID(kCharsetConverterManagerCID, NS_ICHARSETCONVERTERMANAGER_CID);

NS_IMPL_ISUPPORTS1(nsFilePicker, nsIFilePicker)

//-------------------------------------------------------------------------
//
// nsFilePicker constructor
//
//-------------------------------------------------------------------------
nsFilePicker::nsFilePicker()
{
  NS_INIT_REFCNT();
  mWnd = NULL;
  mUnicodeEncoder = nsnull;
  mUnicodeDecoder = nsnull;
  mDisplayDirectory = do_CreateInstance("@mozilla.org/file/local;1");
}

//-------------------------------------------------------------------------
//
// nsFilePicker destructor
//
//-------------------------------------------------------------------------
nsFilePicker::~nsFilePicker()
{
  NS_IF_RELEASE(mUnicodeEncoder);
  NS_IF_RELEASE(mUnicodeDecoder);
}

//-------------------------------------------------------------------------
//
// Show - Display the file dialog
//
//-------------------------------------------------------------------------
NS_IMETHODIMP nsFilePicker::Show(PRInt16 *retval)
{
  NS_ENSURE_ARG_POINTER(retval);

  PRBool result = PR_FALSE;
  char fileBuffer[MAX_PATH+1] = "";
  char *converted = ConvertToFileSystemCharset(mDefault.get());
  if (nsnull == converted) {
    mDefault.ToCString(fileBuffer,MAX_PATH);
  }
  else {
    PL_strncpyz(fileBuffer, converted, MAX_PATH+1);
    nsMemory::Free( converted );
  }

  char htmExt[] = "html";

  char *title = ConvertToFileSystemCharset(mTitle.get());
  if (nsnull == title)
    title = ToNewCString(mTitle);
  char *initialDir;
  mDisplayDirectory->GetPath(&initialDir);

  mFile.SetLength(0);

  if (mMode == modeGetFolder) {

    char dirBuffer[MAX_PATH+1];
    PL_strncpy(dirBuffer, initialDir, MAX_PATH);
    BROWSEINFO browserInfo;
    browserInfo.hwndOwner      = mWnd;
    browserInfo.pidlRoot       = nsnull;
    browserInfo.pszDisplayName = (LPSTR)dirBuffer;
    browserInfo.lpszTitle      = title;
    browserInfo.ulFlags        = BIF_RETURNONLYFSDIRS;//BIF_STATUSTEXT | BIF_RETURNONLYFSDIRS;
    browserInfo.lpfn           = nsnull;
    browserInfo.lParam         = nsnull;
    browserInfo.iImage         = nsnull;

    // XXX UNICODE support is needed here --> DONE
    LPITEMIDLIST list = ::SHBrowseForFolder(&browserInfo);
    if (list != NULL) {
      result = ::SHGetPathFromIDList(list, (LPSTR)fileBuffer);
      if (result) {
          mFile.Append(fileBuffer);
      }
  
      // free PIDL
      LPMALLOC pMalloc = NULL;
      ::SHGetMalloc(&pMalloc);
      if(pMalloc) {
         pMalloc->Free(list);
         pMalloc->Release();
      }
    }
  }
  else {

    OPENFILENAME ofn;
    memset(&ofn, 0, sizeof(ofn));

    ofn.lStructSize = sizeof(ofn);

    PRInt32 l = (mFilterList.Length()+2)*2;
    char *filterBuffer = (char*) nsMemory::Alloc(l);
    int len = WideCharToMultiByte(CP_ACP, 0,
                                  mFilterList.get(),
                                  mFilterList.Length(),
                                  filterBuffer,
                                  l, NULL, NULL);
    filterBuffer[len] = NULL;
    filterBuffer[len+1] = NULL;
                                  
    if (initialDir && *initialDir) {
      ofn.lpstrInitialDir = initialDir;
    }

    ofn.lpstrTitle   = title;
    ofn.lpstrFilter  = filterBuffer;
    ofn.nFilterIndex = 1;
    ofn.hwndOwner    = mWnd;
    ofn.lpstrFile    = fileBuffer;
    ofn.nMaxFile     = MAX_PATH;

    ofn.Flags = OFN_NOCHANGEDIR | OFN_SHAREAWARE | OFN_LONGNAMES | OFN_OVERWRITEPROMPT | OFN_HIDEREADONLY;

    // Get file extension from suggested filename
    //  to detect if we are saving an html file
    //XXX: nsIFile SHOULD HAVE A GetExtension() METHOD!
    PRInt32 extIndex = mDefault.RFind(".");
    if ( extIndex >= 0) {
      nsAutoString ext;
      mDefault.Right(ext, mDefault.Length() - extIndex);
      // Should we test for ".cgi", ".asp", ".jsp" and other "generated" html pages?
      if ( ext.EqualsIgnoreCase(".htm")  || 
           ext.EqualsIgnoreCase(".html") || 
           ext.EqualsIgnoreCase(".shtml") ) {
        // This is supposed to append ".htm" if user doesn't supply an extension
        //XXX Actually, behavior is sort of weird:
        //    often appends ".html" even if you have an extension
        //    It obeys your extension if you put quotes around name
        ofn.lpstrDefExt = htmExt;
      }
    }

    if (mMode == modeOpen) {
      // FILE MUST EXIST!
      ofn.Flags |= OFN_FILEMUSTEXIST;
      result = ::GetOpenFileName(&ofn);
    }
    else if (mMode == modeSave) {
      result = ::GetSaveFileName(&ofn);
      if (!result) {
        // Error, find out what kind.
        DWORD error = ::GetLastError();
        if (error == ERROR_INVALID_PARAMETER) {
          // Parameter error; probably the default file name is too long.
          // Try again, without a starting file name.
          ofn.lpstrFile[0] = 0;
          result = ::GetSaveFileName(&ofn);
        }
      }
    }
    else {
      NS_ASSERTION(0, "Only load, save and getFolder are supported modes"); 
    }
  
    // Remember what filter type the user selected
    mSelectedType = (PRInt16)ofn.nFilterIndex;

    // Store the current directory in mDisplayDirectory
    char* newCurrentDirectory = NS_STATIC_CAST( char*, nsMemory::Alloc( MAX_PATH+1 ) );
    VERIFY(::GetCurrentDirectory(MAX_PATH, newCurrentDirectory) > 0);
    mDisplayDirectory->InitWithPath(newCurrentDirectory);
    nsMemory::Free( newCurrentDirectory );

    // Clean up filter buffers
    if (filterBuffer)
      nsMemory::Free( filterBuffer );

    // Set user-selected location of file or directory
    if (result == PR_TRUE) {
      // I think it also needs a conversion here (to unicode since appending to nsString) 
      // but doing that generates garbage file name, weird.
      mFile.Append(fileBuffer);
    }

  }

  if (initialDir)
    nsMemory::Free(initialDir);

  if (title)
    nsMemory::Free( title );

  if (result) {
    PRInt16 returnOKorReplace = returnOK;

    if (mMode == modeSave) {
      // Windows does not return resultReplace,
      //   we must check if file already exists
      nsCOMPtr<nsILocalFile> file(do_CreateInstance("@mozilla.org/file/local;1"));

      NS_ENSURE_TRUE(file, NS_ERROR_FAILURE);

      file->InitWithPath(mFile.get());

      PRBool exists = PR_FALSE;
      file->Exists(&exists);
      if (exists)
        returnOKorReplace = returnReplace;
    }
    *retval = returnOKorReplace;
  }
  else {
    *retval = returnCancel;
  }
  return NS_OK;
}



NS_IMETHODIMP nsFilePicker::GetFile(nsILocalFile **aFile)
{
  NS_ENSURE_ARG_POINTER(aFile);

  if (mFile.IsEmpty())
      return NS_OK;

  nsCOMPtr<nsILocalFile> file(do_CreateInstance("@mozilla.org/file/local;1"));
    
  NS_ENSURE_TRUE(file, NS_ERROR_FAILURE);

  file->InitWithPath(mFile.get());

  NS_ADDREF(*aFile = file);

  return NS_OK;
}

//-------------------------------------------------------------------------
NS_IMETHODIMP nsFilePicker::GetFileURL(nsIFileURL **aFileURL)
{
  nsCOMPtr<nsILocalFile> file(do_CreateInstance("@mozilla.org/file/local;1"));
  NS_ENSURE_TRUE(file, NS_ERROR_FAILURE);
  file->InitWithPath(mFile.get());

  nsCOMPtr<nsIURI> uri;
  NS_NewFileURI(getter_AddRefs(uri), file);
  nsCOMPtr<nsIFileURL> fileURL(do_QueryInterface(uri));
  NS_ENSURE_TRUE(fileURL, NS_ERROR_FAILURE);

  NS_ADDREF(*aFileURL = fileURL);

  return NS_OK;
}

//-------------------------------------------------------------------------
//
// Get the file + path
//
//-------------------------------------------------------------------------
NS_IMETHODIMP nsFilePicker::SetDefaultString(const PRUnichar *aString)
{
  mDefault = aString;
  return NS_OK;
}

NS_IMETHODIMP nsFilePicker::GetDefaultString(PRUnichar **aString)
{
  return NS_ERROR_FAILURE;
}

//-------------------------------------------------------------------------
//
// Set the filter index
//
//-------------------------------------------------------------------------
NS_IMETHODIMP nsFilePicker::GetFilterIndex(PRInt32 *aFilterIndex)
{
  // Windows' filter index is 1-based, we use a 0-based system.
  *aFilterIndex = mSelectedType - 1;
  return NS_OK;
}

NS_IMETHODIMP nsFilePicker::SetFilterIndex(PRInt32 aFilterIndex)
{
  // Windows' filter index is 1-based, we use a 0-based system.
  mSelectedType = aFilterIndex + 1;
  return NS_OK;
}

//-------------------------------------------------------------------------
//
// Set the display directory
//
//-------------------------------------------------------------------------
NS_IMETHODIMP nsFilePicker::SetDisplayDirectory(nsILocalFile *aDirectory)
{
  mDisplayDirectory = aDirectory;
  return NS_OK;
}

//-------------------------------------------------------------------------
//
// Get the display directory
//
//-------------------------------------------------------------------------
NS_IMETHODIMP nsFilePicker::GetDisplayDirectory(nsILocalFile **aDirectory)
{
  *aDirectory = mDisplayDirectory;
  NS_IF_ADDREF(*aDirectory);
  return NS_OK;
}



//-------------------------------------------------------------------------
NS_IMETHODIMP nsFilePicker::InitNative(nsIWidget *aParent,
                                       const PRUnichar *aTitle,
                                       PRInt16 aMode)
{
  mWnd = (HWND) ((aParent) ? aParent->GetNativeData(NS_NATIVE_WINDOW) : 0); 
  mTitle.SetLength(0);
  mTitle.Append(aTitle);
  mMode = aMode;
  return NS_OK;
}


//-------------------------------------------------------------------------
void nsFilePicker::GetFileSystemCharset(nsString & fileSystemCharset)
{
  static nsAutoString aCharset;
  nsresult rv;

  if (aCharset.Length() < 1) {
    nsCOMPtr <nsIPlatformCharset> platformCharset = do_GetService(NS_PLATFORMCHARSET_CONTRACTID, &rv);
	  if (NS_SUCCEEDED(rv)) 
		  rv = platformCharset->GetCharset(kPlatformCharsetSel_FileName, aCharset);

    NS_ASSERTION(NS_SUCCEEDED(rv), "error getting platform charset");
	  if (NS_FAILED(rv)) 
		  aCharset.Assign(NS_LITERAL_STRING("windows-1252"));
  }
  fileSystemCharset = aCharset;
}

//-------------------------------------------------------------------------
char * nsFilePicker::ConvertToFileSystemCharset(const PRUnichar *inString)
{
  char *outString = nsnull;
  nsresult rv = NS_OK;

  // get file system charset and create a unicode encoder
  if (nsnull == mUnicodeEncoder) {
    nsAutoString fileSystemCharset;
    GetFileSystemCharset(fileSystemCharset);

    nsCOMPtr<nsICharsetConverterManager> ccm = 
             do_GetService(kCharsetConverterManagerCID, &rv); 
    if (NS_SUCCEEDED(rv)) {
      rv = ccm->GetUnicodeEncoder(&fileSystemCharset, &mUnicodeEncoder);
    }
  }

  // converts from unicode to the file system charset
  if (NS_SUCCEEDED(rv)) {
    PRInt32 inLength = nsCRT::strlen(inString);
    PRInt32 outLength;
    rv = mUnicodeEncoder->GetMaxLength(inString, inLength, &outLength);
    if (NS_SUCCEEDED(rv)) {
      outString = NS_STATIC_CAST( char*, nsMemory::Alloc( outLength+1 ) );
      if (nsnull == outString) {
        return nsnull;
      }
      rv = mUnicodeEncoder->Convert(inString, &inLength, outString, &outLength);
      if (NS_SUCCEEDED(rv)) {
        outString[outLength] = '\0';
      }
    }
  }
  
  return NS_SUCCEEDED(rv) ? outString : nsnull;
}

//-------------------------------------------------------------------------
PRUnichar * nsFilePicker::ConvertFromFileSystemCharset(const char *inString)
{
  PRUnichar *outString = nsnull;
  nsresult rv = NS_OK;

  // get file system charset and create a unicode encoder
  if (nsnull == mUnicodeDecoder) {
    nsAutoString fileSystemCharset;
    GetFileSystemCharset(fileSystemCharset);

    nsCOMPtr<nsICharsetConverterManager> ccm = 
             do_GetService(kCharsetConverterManagerCID, &rv); 
    if (NS_SUCCEEDED(rv)) {
      rv = ccm->GetUnicodeDecoder(&fileSystemCharset, &mUnicodeDecoder);
    }
  }

  // converts from the file system charset to unicode
  if (NS_SUCCEEDED(rv)) {
    PRInt32 inLength = nsCRT::strlen(inString);
    PRInt32 outLength;
    rv = mUnicodeDecoder->GetMaxLength(inString, inLength, &outLength);
    if (NS_SUCCEEDED(rv)) {
      outString = NS_STATIC_CAST( PRUnichar*, nsMemory::Alloc( (outLength+1) * sizeof( PRUnichar ) ) );
      if (nsnull == outString) {
        return nsnull;
      }
      rv = mUnicodeDecoder->Convert(inString, &inLength, outString, &outLength);
      if (NS_SUCCEEDED(rv)) {
        outString[outLength] = 0;
      }
    }
  }

  NS_ASSERTION(NS_SUCCEEDED(rv), "error charset conversion");
  return NS_SUCCEEDED(rv) ? outString : nsnull;
}


NS_IMETHODIMP
nsFilePicker::AppendFilter(const PRUnichar *aTitle, const PRUnichar *aFilter)
{
  mFilterList.Append(aTitle);
  mFilterList.Append(PRUnichar('\0'));
  mFilterList.Append(aFilter);
  mFilterList.Append(PRUnichar('\0'));

  return NS_OK;
}