/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
 * ucvhi : nsUnicodeToSunIndic.h
 *
 * ***** 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
 * Sun Microsystems, Inc.
 * Portions created by the Initial Developer are Copyright (C) 2000
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *   Prabhat Hegde (prabhat.hegde@sun.com)
 *   Jungshik Shin (jshin@mailmaps.org)
 *
 * 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 "nsCOMPtr.h"
#include "nsCtlCIID.h"
#include "nsILE.h"
#include "nsULE.h"
#include "nsUnicodeToSunIndic.h"

NS_IMPL_ISUPPORTS2(nsUnicodeToSunIndic, nsIUnicodeEncoder, nsICharRepresentable)

NS_IMETHODIMP
nsUnicodeToSunIndic::SetOutputErrorBehavior(PRInt32           aBehavior,
                                            nsIUnicharEncoder *aEncoder,
                                            PRUnichar         aChar)
{
  if (aBehavior == kOnError_CallBack && aEncoder == nsnull)
     return NS_ERROR_NULL_POINTER;
  mErrEncoder = aEncoder;
  mErrBehavior = aBehavior;
  mErrChar = aChar;
  return NS_OK;
}

// constructor and destructor
nsUnicodeToSunIndic::nsUnicodeToSunIndic()
{
  static   NS_DEFINE_CID(kLECID, NS_ULE_CID);
  nsresult rv;

  mCtlObj = do_CreateInstance(kLECID, &rv);
  if (NS_FAILED(rv)) {

#ifdef DEBUG_prabhath
    // No other error handling needed here since we
    // handle absence of mCtlObj in Convert
    printf("ERROR: Cannot create instance of component " NS_ULE_PROGID " [%x].\n", rv);
#endif

    NS_WARNING("Indian Text Shaping Will Not Be Supported\n");
    mCtlObj = nsnull;
  }
}

nsUnicodeToSunIndic::~nsUnicodeToSunIndic()
{
  // Maybe convert nsILE to a service
  //NS_IF_RELEASE(mCtlObj);
}

/*
 * This method converts the unicode to this font index.
 * Note: ConversionBufferFullException is not handled
 *       since this class is only used for character display.
 */
NS_IMETHODIMP nsUnicodeToSunIndic::Convert(const PRUnichar* input,
                                           PRInt32*         aSrcLength,
                                           char*            output,
                                           PRInt32*         aDestLength)
{
  PRSize outLen;

  if (mCtlObj == nsnull) {
#ifdef DEBUG_prabhath
  printf("Debug/Test Case of No Hindi pango shaper Object\n");
  // Comment out mCtlObj == nsnull for test purposes
  printf("ERROR: No Hindi Text Layout Implementation");
#endif

    NS_WARNING("cannot get default converter for Hindi");
    return NS_ERROR_FAILURE;
  }

  mCharOff = mByteOff = 0;
  mCtlObj->GetPresentationForm(input, *aSrcLength, "sun.unicode.india-0",
                               &output[mByteOff], &outLen, PR_TRUE);
  *aDestLength = outLen;
  return NS_OK;
}

NS_IMETHODIMP nsUnicodeToSunIndic::Finish(char *output, PRInt32 *aDestLength)
{
  // Finish does'nt have to do much as Convert already flushes
  // to output buffer
  mByteOff = mCharOff = 0;
  return NS_OK;
}

//================================================================
NS_IMETHODIMP nsUnicodeToSunIndic::Reset()
{
  mByteOff = mCharOff = 0;
  return NS_OK;
}

//================================================================
NS_IMETHODIMP nsUnicodeToSunIndic::GetMaxLength(const PRUnichar * aSrc,
                                                PRInt32 aSrcLength,
                                                PRInt32 * aDestLength)
{
  *aDestLength = (aSrcLength + 1) *  2; // Each Hindi character can generate
                                        // atmost two presentation forms
  return NS_OK;
}

//================================================================
NS_IMETHODIMP nsUnicodeToSunIndic::FillInfo(PRUint32* aInfo)
{
  PRUint16 i;

  // 00-0x7f
  for (i = 0;i <= 0x7f; i++)
    SET_REPRESENTABLE(aInfo, i);

  // \u904, \u90a, \u93b, \u94e, \u94f are Undefined
  for (i = 0x0901; i <= 0x0903; i++)
    SET_REPRESENTABLE(aInfo, i);

  for (i = 0x0905; i <= 0x0939; i++)
    SET_REPRESENTABLE(aInfo, i);

  for (i = 0x093c; i <= 0x094d; i++)
    SET_REPRESENTABLE(aInfo, i);

  for (i = 0x0950; i <= 0x0954; i++)
    SET_REPRESENTABLE(aInfo, i);

  for (i = 0x0958; i <= 0x0970; i++)
    SET_REPRESENTABLE(aInfo, i);
 
  // ZWJ and ZWNJ support & coverage need to be added.
  return NS_OK;
}
