// Copyright 2014 PDFium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
// Original code is licensed as follows:
/*
 * Copyright 2007 ZXing authors
 *
 * Licensed under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include "xfa/fxbarcode/qrcode/BC_QRDataBlock.h"

#include <memory>

#include "xfa/fxbarcode/qrcode/BC_QRCoderECB.h"
#include "xfa/fxbarcode/qrcode/BC_QRCoderECBlocks.h"
#include "xfa/fxbarcode/qrcode/BC_QRCoderVersion.h"
#include "xfa/fxbarcode/utils.h"

CBC_QRDataBlock::CBC_QRDataBlock(int32_t numDataCodewords,
                                 CFX_ByteArray* codewords)
    : m_numDataCodewords(numDataCodewords), m_codewords(codewords) {}
CBC_QRDataBlock::~CBC_QRDataBlock() {
  delete m_codewords;
}
int32_t CBC_QRDataBlock::GetNumDataCodewords() {
  return m_numDataCodewords;
}
CFX_ByteArray* CBC_QRDataBlock::GetCodewords() {
  return m_codewords;
}
CFX_ArrayTemplate<CBC_QRDataBlock*>* CBC_QRDataBlock::GetDataBlocks(
    CFX_ByteArray* rawCodewords,
    CBC_QRCoderVersion* version,
    CBC_QRCoderErrorCorrectionLevel* ecLevel,
    int32_t& e) {
  if (rawCodewords->GetSize() != version->GetTotalCodeWords()) {
    e = BCExceptionIllegalArgument;
    BC_EXCEPTION_CHECK_ReturnValue(e, NULL);
  }
  CBC_QRCoderECBlocks* ecBlocks = version->GetECBlocksForLevel(ecLevel);
  int32_t totalBlocks = 0;
  CFX_ArrayTemplate<CBC_QRCoderECB*>* ecBlockArray = ecBlocks->GetECBlocks();
  int32_t i = 0;
  for (i = 0; i < ecBlockArray->GetSize(); i++) {
    totalBlocks += (*ecBlockArray)[i]->GetCount();
  }
  std::unique_ptr<CFX_ArrayTemplate<CBC_QRDataBlock*>> result(
      new CFX_ArrayTemplate<CBC_QRDataBlock*>());
  result->SetSize(totalBlocks);
  int32_t numResultBlocks = 0;
  for (int32_t j = 0; j < ecBlockArray->GetSize(); j++) {
    CBC_QRCoderECB* ecBlock = (*ecBlockArray)[j];
    for (int32_t k = 0; k < ecBlock->GetCount(); k++) {
      int32_t numDataCodewords = ecBlock->GetDataCodeWords();
      int32_t numBlockCodewords =
          ecBlocks->GetECCodeWordsPerBlock() + numDataCodewords;
      CFX_ByteArray* bytearray = new CFX_ByteArray();
      bytearray->SetSize(numBlockCodewords);
      (*result)[numResultBlocks++] =
          new CBC_QRDataBlock(numDataCodewords, bytearray);
    }
  }
  int32_t shorterBlocksTotalCodewords = (*result)[0]->m_codewords->GetSize();
  int32_t longerBlocksStartAt = result->GetSize() - 1;
  while (longerBlocksStartAt >= 0) {
    int32_t numCodewords =
        (*result)[longerBlocksStartAt]->m_codewords->GetSize();
    if (numCodewords == shorterBlocksTotalCodewords) {
      break;
    }
    longerBlocksStartAt--;
  }
  longerBlocksStartAt++;
  int32_t shorterBlocksNumDataCodewords =
      shorterBlocksTotalCodewords - ecBlocks->GetECCodeWordsPerBlock();
  int32_t rawCodewordsOffset = 0;
  int32_t x = 0;
  for (int32_t k = 0; k < shorterBlocksNumDataCodewords; k++) {
    for (x = 0; x < numResultBlocks; x++) {
      (*((*result)[x]->m_codewords))[k] = (*rawCodewords)[rawCodewordsOffset++];
    }
  }
  for (x = longerBlocksStartAt; x < numResultBlocks; x++) {
    (*((*result)[x]->m_codewords))[shorterBlocksNumDataCodewords] =
        (*rawCodewords)[rawCodewordsOffset++];
  }
  int32_t max = (*result)[0]->m_codewords->GetSize();
  for (i = shorterBlocksNumDataCodewords; i < max; i++) {
    for (int32_t y = 0; y < numResultBlocks; y++) {
      int32_t iOffset = y < longerBlocksStartAt ? i : i + 1;
      (*((*result)[y]->m_codewords))[iOffset] =
          (*rawCodewords)[rawCodewordsOffset++];
    }
  }
  return result.release();
}