using BillSplitter.Model;

using log4net;

using System;

using System.Collections.Generic;

using System.IO;

using System.Reflection;

​

namespace BillSplitter

{

    public static class CampingTripStreamReader

    {

        private static readonly ILog log = LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);

​

        public static CampingTripParsingVO ReadDataFromFile(string fileName)

        {

            CampingTripParsingVO campingTripParsingVO = new CampingTripParsingVO();

            CampingTrip currentTrip;

            int numberOfParticipants = 0;

            int numberOfCharges = 0;

            try

            {

                if (!File.Exists(fileName))

                {

                    log.ErrorFormat("Input file {0} does not exist", fileName);

                    campingTripParsingVO.Result = false;

                }

                using (StreamReader sr = new StreamReader(fileName))

                {

                    string line = string.Empty;

                    while ((line = sr.ReadLine()) != null)

                    {

                        numberOfParticipants = ParseInt(line);

                        if (numberOfParticipants > 0)

                        {

                            currentTrip = new CampingTrip();

                            currentTrip.Participants = new List<CampingParticipant>(numberOfParticipants);

                            campingTripParsingVO.CampingTrips.Add(currentTrip);

                            while (numberOfParticipants > 0)

                            {

                                CampingParticipant campingParticipant = new CampingParticipant();

                                numberOfCharges = ParseInt(sr.ReadLine());

                                for (int i = 0; i < numberOfCharges; i++)

                                {

                                    campingParticipant.TotalCharges += ParseMoney(sr.ReadLine());

                                }

                                currentTrip.Participants.Add(campingParticipant);

                                numberOfParticipants = numberOfParticipants - 1;

                            }

                        }

                        //Stop once reach the end of input file.

                        else

                        {

                            break;

                        }

                    }

                    campingTripParsingVO.Result = true;

                }

            }

            catch(Exception ex)

            {

                log.ErrorFormat("Error while processing file {0}. Inner Exception details {1}", fileName, ex.InnerException);

                campingTripParsingVO.Result = false;

            }

            return campingTripParsingVO;

        }

​

        private static int ParseInt(string input)

        {

            int value = 0;

            int.TryParse(input, out value);

            return value;

        }

​

        private static decimal ParseMoney(string input)

        {

            decimal value = 0;

            decimal.TryParse(input, out value);

            return value;

        }

    }

}

​