/*
 * 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/
 */

package com.google.zxing.oned.rss.expanded.decoders;

import com.google.zxing.NotFoundException;

/**
 * @author Pablo Orduña, University of Deusto (pablo.orduna@deusto.es)
 * @author Eduardo Castillejo, University of Deusto (eduardo.castillejo@deusto.es)
 */
final class FieldParser {

  private static final Object VARIABLE_LENGTH = new Object();

  private static final Object [][] TWO_DIGIT_DATA_LENGTH = {
    // "DIGITS", new Integer(LENGTH)
    //    or
    // "DIGITS", VARIABLE_LENGTH, new Integer(MAX_SIZE)

    { "00", 18},
    { "01", 14},
    { "02", 14},

    { "10", VARIABLE_LENGTH, 20},
    { "11", 6},
    { "12", 6},
    { "13", 6},
    { "15", 6},
    { "17", 6},

    { "20", 2},
    { "21", VARIABLE_LENGTH, 20},
    { "22", VARIABLE_LENGTH, 29},

    { "30", VARIABLE_LENGTH, 8},
    { "37", VARIABLE_LENGTH, 8},

    //internal company codes
    { "90", VARIABLE_LENGTH, 30},
    { "91", VARIABLE_LENGTH, 30},
    { "92", VARIABLE_LENGTH, 30},
    { "93", VARIABLE_LENGTH, 30},
    { "94", VARIABLE_LENGTH, 30},
    { "95", VARIABLE_LENGTH, 30},
    { "96", VARIABLE_LENGTH, 30},
    { "97", VARIABLE_LENGTH, 30},
    { "98", VARIABLE_LENGTH, 30},
    { "99", VARIABLE_LENGTH, 30},
  };

  private static final Object [][] THREE_DIGIT_DATA_LENGTH = {
    // Same format as above

    { "240", VARIABLE_LENGTH, 30},
    { "241", VARIABLE_LENGTH, 30},
    { "242", VARIABLE_LENGTH, 6},
    { "250", VARIABLE_LENGTH, 30},
    { "251", VARIABLE_LENGTH, 30},
    { "253", VARIABLE_LENGTH, 17},
    { "254", VARIABLE_LENGTH, 20},

    { "400", VARIABLE_LENGTH, 30},
    { "401", VARIABLE_LENGTH, 30},
    { "402", 17},
    { "403", VARIABLE_LENGTH, 30},
    { "410", 13},
    { "411", 13},
    { "412", 13},
    { "413", 13},
    { "414", 13},
    { "420", VARIABLE_LENGTH, 20},
    { "421", VARIABLE_LENGTH, 15},
    { "422", 3},
    { "423", VARIABLE_LENGTH, 15},
    { "424", 3},
    { "425", 3},
    { "426", 3},
  };

  private static final Object [][] THREE_DIGIT_PLUS_DIGIT_DATA_LENGTH = {
    // Same format as above

    { "310", 6},
    { "311", 6},
    { "312", 6},
    { "313", 6},
    { "314", 6},
    { "315", 6},
    { "316", 6},
    { "320", 6},
    { "321", 6},
    { "322", 6},
    { "323", 6},
    { "324", 6},
    { "325", 6},
    { "326", 6},
    { "327", 6},
    { "328", 6},
    { "329", 6},
    { "330", 6},
    { "331", 6},
    { "332", 6},
    { "333", 6},
    { "334", 6},
    { "335", 6},
    { "336", 6},
    { "340", 6},
    { "341", 6},
    { "342", 6},
    { "343", 6},
    { "344", 6},
    { "345", 6},
    { "346", 6},
    { "347", 6},
    { "348", 6},
    { "349", 6},
    { "350", 6},
    { "351", 6},
    { "352", 6},
    { "353", 6},
    { "354", 6},
    { "355", 6},
    { "356", 6},
    { "357", 6},
    { "360", 6},
    { "361", 6},
    { "362", 6},
    { "363", 6},
    { "364", 6},
    { "365", 6},
    { "366", 6},
    { "367", 6},
    { "368", 6},
    { "369", 6},
    { "390", VARIABLE_LENGTH, 15},
    { "391", VARIABLE_LENGTH, 18},
    { "392", VARIABLE_LENGTH, 15},
    { "393", VARIABLE_LENGTH, 18},
    { "703", VARIABLE_LENGTH, 30},
  };

  private static final Object [][] FOUR_DIGIT_DATA_LENGTH = {
    // Same format as above

    { "7001", 13},
    { "7002", VARIABLE_LENGTH, 30},
    { "7003", 10},

    { "8001", 14},
    { "8002", VARIABLE_LENGTH, 20},
    { "8003", VARIABLE_LENGTH, 30},
    { "8004", VARIABLE_LENGTH, 30},
    { "8005", 6},
    { "8006", 18},
    { "8007", VARIABLE_LENGTH, 30},
    { "8008", VARIABLE_LENGTH, 12},
    { "8018", 18},
    { "8020", VARIABLE_LENGTH, 25},
    { "8100", 6},
    { "8101", 10},
    { "8102", 2},
    { "8110", VARIABLE_LENGTH, 70},
    { "8200", VARIABLE_LENGTH, 70},
  };

  private FieldParser() {
  }

  static String parseFieldsInGeneralPurpose(String rawInformation) throws NotFoundException {
    if (rawInformation.isEmpty()) {
      return null;
    }

    // Processing 2-digit AIs

    if (rawInformation.length() < 2) {
      throw NotFoundException.getNotFoundInstance();
    }

    String firstTwoDigits = rawInformation.substring(0, 2);

    for (Object[] dataLength : TWO_DIGIT_DATA_LENGTH) {
      if (dataLength[0].equals(firstTwoDigits)) {
        if (dataLength[1] == VARIABLE_LENGTH) {
          return processVariableAI(2, (Integer) dataLength[2], rawInformation);
        }
        return processFixedAI(2, (Integer) dataLength[1], rawInformation);
      }
    }

    if (rawInformation.length() < 3) {
      throw NotFoundException.getNotFoundInstance();
    }

    String firstThreeDigits = rawInformation.substring(0, 3);

    for (Object[] dataLength : THREE_DIGIT_DATA_LENGTH) {
      if (dataLength[0].equals(firstThreeDigits)) {
        if (dataLength[1] == VARIABLE_LENGTH) {
          return processVariableAI(3, (Integer) dataLength[2], rawInformation);
        }
        return processFixedAI(3, (Integer) dataLength[1], rawInformation);
      }
    }


    for (Object[] dataLength : THREE_DIGIT_PLUS_DIGIT_DATA_LENGTH) {
      if (dataLength[0].equals(firstThreeDigits)) {
        if (dataLength[1] == VARIABLE_LENGTH) {
          return processVariableAI(4, (Integer) dataLength[2], rawInformation);
        }
        return processFixedAI(4, (Integer) dataLength[1], rawInformation);
      }
    }

    if (rawInformation.length() < 4) {
      throw NotFoundException.getNotFoundInstance();
    }

    String firstFourDigits = rawInformation.substring(0, 4);

    for (Object[] dataLength : FOUR_DIGIT_DATA_LENGTH) {
      if (dataLength[0].equals(firstFourDigits)) {
        if (dataLength[1] == VARIABLE_LENGTH) {
          return processVariableAI(4, (Integer) dataLength[2], rawInformation);
        }
        return processFixedAI(4, (Integer) dataLength[1], rawInformation);
      }
    }

    throw NotFoundException.getNotFoundInstance();
  }

  private static String processFixedAI(int aiSize, int fieldSize, String rawInformation) throws NotFoundException {
    if (rawInformation.length() < aiSize) {
      throw NotFoundException.getNotFoundInstance();
    }

    String ai = rawInformation.substring(0, aiSize);

    if (rawInformation.length() < aiSize + fieldSize) {
      throw NotFoundException.getNotFoundInstance();
    }

    String field = rawInformation.substring(aiSize, aiSize + fieldSize);
    String remaining = rawInformation.substring(aiSize + fieldSize);
    String result = '(' + ai + ')' + field;
    String parsedAI = parseFieldsInGeneralPurpose(remaining);
    return parsedAI == null ? result : result + parsedAI;
  }

  private static String processVariableAI(int aiSize, int variableFieldSize, String rawInformation)
      throws NotFoundException {
    String ai = rawInformation.substring(0, aiSize);
    int maxSize = Math.min(rawInformation.length(), aiSize + variableFieldSize);
    String field = rawInformation.substring(aiSize, maxSize);
    String remaining = rawInformation.substring(maxSize);
    String result = '(' + ai + ')' + field;
    String parsedAI = parseFieldsInGeneralPurpose(remaining);
    return parsedAI == null ? result : result + parsedAI;
  }
}
