/*
 * Copyright (C) 2010 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.
 */

/*
 * These authors would like to acknowledge the Spanish Ministry of Industry,
 * Tourism and Trade, for the support in the project TSI020301-2008-2
 * "PIRAmIDE: Personalizable Interactions with Resources on AmI-enabled
 * Mobile Dynamic Environments", led by Treelogic
 * ( http://www.treelogic.com/ ):
 *
 *   http://www.piramidepse.com/
 */

using System.Collections.Generic;
using ZXing.Common;

namespace ZXing.OneD.RSS.Expanded
{
   /// <summary>
   /// <author>Pablo Orduña, University of Deusto (pablo.orduna@deusto.es)</author>
   /// <author>Eduardo Castillejo, University of Deusto (eduardo.castillejo@deusto.es)</author>
   /// </summary>
   static class BitArrayBuilder
   {
      internal static BitArray buildBitArray(List<ExpandedPair> pairs)
      {
         int charNumber = (pairs.Count << 1) - 1;
         if (pairs[pairs.Count - 1].RightChar == null)
         {
            charNumber -= 1;
         }

         int size = 12 * charNumber;

         BitArray binary = new BitArray(size);
         int accPos = 0;

         ExpandedPair firstPair = pairs[0];
         int firstValue = firstPair.RightChar.Value;
         for (int i = 11; i >= 0; --i)
         {
            if ((firstValue & (1 << i)) != 0)
            {
               binary[accPos] = true;
            }
            accPos++;
         }

         for (int i = 1; i < pairs.Count; ++i)
         {
            ExpandedPair currentPair = pairs[i];

            int leftValue = currentPair.LeftChar.Value;
            for (int j = 11; j >= 0; --j)
            {
               if ((leftValue & (1 << j)) != 0)
               {
                  binary[accPos] = true;
               }
               accPos++;
            }

            if (currentPair.RightChar != null)
            {
               int rightValue = currentPair.RightChar.Value;
               for (int j = 11; j >= 0; --j)
               {
                  if ((rightValue & (1 << j)) != 0)
                  {
                     binary[accPos] = true;
                  }
                  accPos++;
               }
            }
         }
         return binary;
      }
   }
}