/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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 "mozilla/ArrayUtils.h"
#include "mozilla/Encoding.h"

#include "nsCharsetAlias.h"

// for NS_ERROR_UCONV_NOCONV
#include "nsCharsetConverterManager.h"

#include "nsUConvPropertySearch.h"

using namespace mozilla;

//
static const nsUConvProp kAliases[] = {
#include "charsetalias.properties.h"
};

//--------------------------------------------------------------
// static
nsresult nsCharsetAlias::GetPreferredInternal(const nsACString& aAlias,
                                              nsACString& oResult) {
  // First check charsetalias.properties and if there is no match, continue to
  // call Encoding::ForLabel.
  nsAutoCString key(aAlias);
  ToLowerCase(key);

  nsresult rv = nsUConvPropertySearch::SearchPropertyValue(
      kAliases, ArrayLength(kAliases), key, oResult);
  if (NS_SUCCEEDED(rv)) {
    return NS_OK;
  }

  const Encoding* encoding = Encoding::ForLabel(key);
  if (!encoding) return NS_ERROR_NOT_AVAILABLE;
  encoding->Name(oResult);
  return NS_OK;
}

//--------------------------------------------------------------
// static
nsresult nsCharsetAlias::GetPreferred(const nsACString& aAlias,
                                      nsACString& oResult) {
  if (aAlias.IsEmpty()) return NS_ERROR_NULL_POINTER;

  nsresult res = GetPreferredInternal(aAlias, oResult);
  if (NS_FAILED(res)) return res;

  if (nsCharsetConverterManager::IsInternal(oResult))
    return NS_ERROR_UCONV_NOCONV;

  return res;
}

//--------------------------------------------------------------
// static
nsresult nsCharsetAlias::Equals(const nsACString& aCharset1,
                                const nsACString& aCharset2, bool* oResult) {
  nsresult res = NS_OK;

  if (aCharset1.Equals(aCharset2, nsCaseInsensitiveCStringComparator)) {
    *oResult = true;
    return res;
  }

  if (aCharset1.IsEmpty() || aCharset2.IsEmpty()) {
    *oResult = false;
    return res;
  }

  *oResult = false;
  nsAutoCString name1;
  res = GetPreferredInternal(aCharset1, name1);
  if (NS_FAILED(res)) return res;

  nsAutoCString name2;
  res = GetPreferredInternal(aCharset2, name2);
  if (NS_FAILED(res)) return res;

  *oResult = name1.Equals(name2);
  return NS_OK;
}