/*
 * 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;
using System.Text;
using ZXing.Common;

namespace ZXing.OneD.RSS.Expanded.Decoders
{
    /// <summary>
    /// <author>Pablo Orduña, University of Deusto (pablo.orduna@deusto.es)</author>
    /// <author>Eduardo Castillejo, University of Deusto (eduardo.castillejo@deusto.es)</author>
    /// </summary>
    sealed class AI013x0x1xDecoder : AI01weightDecoder
    {
        private static int HEADER_SIZE = 7 + 1;
        private static int WEIGHT_SIZE = 20;
        private static int DATE_SIZE = 16;

        private String dateCode;
        private String firstAIdigits;

        internal AI013x0x1xDecoder(BitArray information, String firstAIdigits, String dateCode)
           : base(information)
        {
            this.dateCode = dateCode;
            this.firstAIdigits = firstAIdigits;
        }

        override public String parseInformation()
        {
            if (this.getInformation().Size != HEADER_SIZE + GTIN_SIZE + WEIGHT_SIZE + DATE_SIZE)
            {
                return null;
            }

            StringBuilder buf = new StringBuilder();

            encodeCompressedGtin(buf, HEADER_SIZE);
            encodeCompressedWeight(buf, HEADER_SIZE + GTIN_SIZE, WEIGHT_SIZE);
            encodeCompressedDate(buf, HEADER_SIZE + GTIN_SIZE + WEIGHT_SIZE);

            return buf.ToString();
        }

        private void encodeCompressedDate(StringBuilder buf, int currentPos)
        {
            int numericDate = this.getGeneralDecoder().extractNumericValueFromBitArray(currentPos, DATE_SIZE);
            if (numericDate == 38400)
            {
                return;
            }

            buf.Append('(');
            buf.Append(this.dateCode);
            buf.Append(')');

            int day = numericDate % 32;
            numericDate /= 32;
            int month = numericDate % 12 + 1;
            numericDate /= 12;
            int year = numericDate;

            if (year / 10 == 0)
            {
                buf.Append('0');
            }
            buf.Append(year);
            if (month / 10 == 0)
            {
                buf.Append('0');
            }
            buf.Append(month);
            if (day / 10 == 0)
            {
                buf.Append('0');
            }
            buf.Append(day);
        }

        override protected void addWeightCode(StringBuilder buf, int weight)
        {
            int lastAI = weight / 100000;
            buf.Append('(');
            buf.Append(this.firstAIdigits);
            buf.Append(lastAI);
            buf.Append(')');
        }

        override protected int checkWeight(int weight)
        {
            return weight % 100000;
        }
    }
}
