/*
 * 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.Collections.Generic;
using System.Text;

namespace ZXing.Client.Result
{
    /// <summary>
    /// Parses strings of digits that represent a RSS Extended code.
    /// </summary>
    /// <author>Antonio Manuel Benjumea Conde, Servinform, S.A.</author>
    /// <author>Agustín Delgado, Servinform, S.A.</author>
    public class ExpandedProductResultParser : ResultParser
    {
        /// <summary>
        /// tries to parse a text representation to a specific result object
        /// </summary>
        /// <param name="result"></param>
        /// <returns></returns>
        public override ParsedResult parse(ZXing.Result result)
        {
            BarcodeFormat format = result.BarcodeFormat;
            if (format != BarcodeFormat.RSS_EXPANDED)
            {
                // ExtendedProductParsedResult NOT created. Not a RSS Expanded barcode
                return null;
            }
            String rawText = result.Text;

            String productID = null;
            String sscc = null;
            String lotNumber = null;
            String productionDate = null;
            String packagingDate = null;
            String bestBeforeDate = null;
            String expirationDate = null;
            String weight = null;
            String weightType = null;
            String weightIncrement = null;
            String price = null;
            String priceIncrement = null;
            String priceCurrency = null;
            var uncommonAIs = new Dictionary<String, String>();

            int i = 0;

            while (i < rawText.Length)
            {
                String ai = findAIvalue(i, rawText);
                if (ai == null)
                {
                    // Error. Code doesn't match with RSS expanded pattern
                    // ExtendedProductParsedResult NOT created. Not match with RSS Expanded pattern
                    return null;
                }
                i += ai.Length + 2;
                String value = findValue(i, rawText);
                i += value.Length;

                if ("00".Equals(ai))
                {
                    sscc = value;
                }
                else if ("01".Equals(ai))
                {
                    productID = value;
                }
                else if ("10".Equals(ai))
                {
                    lotNumber = value;
                }
                else if ("11".Equals(ai))
                {
                    productionDate = value;
                }
                else if ("13".Equals(ai))
                {
                    packagingDate = value;
                }
                else if ("15".Equals(ai))
                {
                    bestBeforeDate = value;
                }
                else if ("17".Equals(ai))
                {
                    expirationDate = value;
                }
                else if ("3100".Equals(ai) || "3101".Equals(ai)
                  || "3102".Equals(ai) || "3103".Equals(ai)
                  || "3104".Equals(ai) || "3105".Equals(ai)
                  || "3106".Equals(ai) || "3107".Equals(ai)
                  || "3108".Equals(ai) || "3109".Equals(ai))
                {
                    weight = value;
                    weightType = ExpandedProductParsedResult.KILOGRAM;
                    weightIncrement = ai.Substring(3);
                }
                else if ("3200".Equals(ai) || "3201".Equals(ai)
                  || "3202".Equals(ai) || "3203".Equals(ai)
                  || "3204".Equals(ai) || "3205".Equals(ai)
                  || "3206".Equals(ai) || "3207".Equals(ai)
                  || "3208".Equals(ai) || "3209".Equals(ai))
                {
                    weight = value;
                    weightType = ExpandedProductParsedResult.POUND;
                    weightIncrement = ai.Substring(3);
                }
                else if ("3920".Equals(ai) || "3921".Equals(ai)
                  || "3922".Equals(ai) || "3923".Equals(ai))
                {
                    price = value;
                    priceIncrement = ai.Substring(3);
                }
                else if ("3930".Equals(ai) || "3931".Equals(ai)
                  || "3932".Equals(ai) || "3933".Equals(ai))
                {
                    if (value.Length < 4)
                    {
                        // The value must have more of 3 symbols (3 for currency and
                        // 1 at least for the price)
                        // ExtendedProductParsedResult NOT created. Not match with RSS Expanded pattern
                        return null;
                    }
                    price = value.Substring(3);
                    priceCurrency = value.Substring(0, 3);
                    priceIncrement = ai.Substring(3);
                }
                else
                {
                    // No match with common AIs
                    uncommonAIs[ai] = value;
                }
            }

            return new ExpandedProductParsedResult(rawText,
                                                   productID,
                                                   sscc,
                                                   lotNumber,
                                                   productionDate,
                                                   packagingDate,
                                                   bestBeforeDate,
                                                   expirationDate,
                                                   weight,
                                                   weightType,
                                                   weightIncrement,
                                                   price,
                                                   priceIncrement,
                                                   priceCurrency,
                                                   uncommonAIs);
        }

        private static String findAIvalue(int i, String rawText)
        {
            char c = rawText[i];
            // First character must be a open parenthesis.If not, ERROR
            if (c != '(')
            {
                return null;
            }

            var rawTextAux = rawText.Substring(i + 1);
            var buf = new StringBuilder();

            for (int index = 0; index < rawTextAux.Length; index++)
            {
                char currentChar = rawTextAux[index];
                if (currentChar == ')')
                {
                    return buf.ToString();
                }
                if (currentChar < '0' || currentChar > '9')
                {
                    return null;
                }
                buf.Append(currentChar);
            }
            return buf.ToString();
        }

        private static String findValue(int i, String rawText)
        {
            var buf = new StringBuilder();
            var rawTextAux = rawText.Substring(i);

            for (int index = 0; index < rawTextAux.Length; index++)
            {
                char c = rawTextAux[index];
                if (c == '(')
                {
                    // We look for a new AI. If it doesn't exist (ERROR), we continue
                    // with the iteration
                    if (findAIvalue(index, rawTextAux) != null)
                    {
                        break;
                    }
                    buf.Append('(');
                }
                else
                {
                    buf.Append(c);
                }
            }
            return buf.ToString();
        }
    }
}