using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace DTS.SensorDB.TSF
{
    /// <summary>
    /// handles the CalculateChannelInformation section of the TSF
    /// </summary>
    public class TSFCalculatedChannelInformationSection
    {
        private const string SECTION_START_HEADER = "---- Start Calculated Channel Information ----";
        private const string COLUMN_HEADER = "chan,descrip,processtype,1stchan,2ndchan,3rdchan,value,EU,expmaxrange";
        private const string SECTION_END_HEADER = "---- End Calculated Channel Information ----";
        private List<TSFCalculatedChannelEntry> _calculatedChannels = new List<TSFCalculatedChannelEntry>();
        public TSFCalculatedChannelEntry[] CalculatedChannels
        {
            get { return _calculatedChannels.ToArray(); }
            set { _calculatedChannels = new List<TSFCalculatedChannelEntry>(value); }
        }
        /// <summary>
        /// reads section from TSF
        /// assumes currentline is the start of the section
        /// </summary>
        /// <param name="lines"></param>
        /// <param name="currentLine"></param>
        /// <param name="errors"></param>
        public void ReadFrom(List<string> lines, ref int currentLine, ref List<ReadTSFError> errors)
        {
            _calculatedChannels.Clear();

            if (currentLine == lines.Count)
            {
                errors.Add(new ReadTSFError(ReadTSFError.TSF_ERRORS.TSF_UNEXPECTED_EOF, currentLine));
                return;
            }
            string sectionHeader = lines[currentLine++];
            if (sectionHeader != SECTION_START_HEADER)
            {
                errors.Add(new ReadTSFError(ReadTSFError.TSF_ERRORS.CALCULATEDCHANNELSSECTION_INVALIDSECTIONHEADER, currentLine, sectionHeader));
                return;
            }

            if (currentLine == lines.Count)
            {
                errors.Add(new ReadTSFError(ReadTSFError.TSF_ERRORS.TSF_UNEXPECTED_EOF, currentLine));
                return;
            }
            string columnsHeader = lines[currentLine++];
            if (columnsHeader != COLUMN_HEADER)
            {
                errors.Add(new ReadTSFError(ReadTSFError.TSF_ERRORS.CALCULATEDCHANNELSECTION_INVALIDCOLUMNHEADER, currentLine, columnsHeader));
                return;
            }
            var invariant = System.Globalization.CultureInfo.InvariantCulture;
            bool done = false;
            List<TSFCalculatedChannelEntry> calculatedChannels = new List<TSFCalculatedChannelEntry>();
            while (!done)
            {
                if (currentLine == lines.Count)
                {
                    errors.Add(new ReadTSFError(ReadTSFError.TSF_ERRORS.TSF_UNEXPECTED_EOF, currentLine));
                    return;
                }

                string line = lines[currentLine++];
                if (!line.Contains("End Calculated Channel Information"))
                {
                    string[] tokens = line.Split(new char[] { ',' });
                    TSFCalculatedChannelEntry cc = new TSFCalculatedChannelEntry();
                    for (int iCurField = 0; iCurField < tokens.Length; iCurField++)
                    {
                        string s = tokens[iCurField];
                        TSFCalculatedChannelEntry.Fields field = (TSFCalculatedChannelEntry.Fields)iCurField;
                        switch (field)
                        {
                            case TSFCalculatedChannelEntry.Fields.chan:
                                try { cc.Chan = Convert.ToInt32(s, invariant); }
                                catch (System.Exception) { errors.Add(new ReadTSFError(ReadTSFError.TSF_ERRORS.TSF_CALCULATED_CHANNEL_INVALID_CHAN_FIELD, currentLine, s)); }
                                break;
                            case TSFCalculatedChannelEntry.Fields.descrip: cc.Description = s; break;
                            case TSFCalculatedChannelEntry.Fields.EU: cc.EU = s; break;
                            case TSFCalculatedChannelEntry.Fields.expmaxrange:
                                try { cc.ExpMaxRange = Convert.ToDouble(s, invariant); }
                                catch (System.Exception) { errors.Add(new ReadTSFError(ReadTSFError.TSF_ERRORS.TSF_CALCULATED_CHANNEL_INVALID_EXPMAXRANGE, currentLine, s)); }
                                break;
                            case TSFCalculatedChannelEntry.Fields.firstchan:
                                try { cc.FirstChan = Convert.ToInt32(s, invariant); }
                                catch (System.Exception) { errors.Add(new ReadTSFError(ReadTSFError.TSF_ERRORS.TSF_CALCULATED_CHANNEL_INVALID_FIRSTCHAN, currentLine, s)); }
                                break;
                            case TSFCalculatedChannelEntry.Fields.processtype:
                                try { cc.ProcessType = Convert.ToInt32(s, invariant); }
                                catch (System.Exception) { errors.Add(new ReadTSFError(ReadTSFError.TSF_ERRORS.TSF_CALCULATED_CHANNEL_INVALID_PROCESSTYPE, currentLine, s)); }
                                break;
                            case TSFCalculatedChannelEntry.Fields.progress2:
                                try { cc.Progress2 = Convert.ToDouble(s, invariant); }
                                catch (System.Exception) { errors.Add(new ReadTSFError(ReadTSFError.TSF_ERRORS.TSF_CALCULATED_CHANNEL_INVALID_PROGRESS2, currentLine, s)); }
                                break;
                            case TSFCalculatedChannelEntry.Fields.progress3:
                                try { cc.Progress3 = Convert.ToDouble(s, invariant); }
                                catch (System.Exception) { errors.Add(new ReadTSFError(ReadTSFError.TSF_ERRORS.TSF_CALCULATED_CHANNEL_INVALID_PROGRESS3, currentLine, s)); }
                                break;
                            case TSFCalculatedChannelEntry.Fields.secondchan:
                                try { cc.SecondChan = Convert.ToInt32(s, invariant); }
                                catch (System.Exception) { errors.Add(new ReadTSFError(ReadTSFError.TSF_ERRORS.TSF_CALCULATED_CHANNEL_INVALID_SECONDCHAN, currentLine, s)); }
                                break;
                            case TSFCalculatedChannelEntry.Fields.thirdchan:
                                try { cc.ThirdChan = Convert.ToInt32(s, invariant); }
                                catch (System.Exception) { errors.Add(new ReadTSFError(ReadTSFError.TSF_ERRORS.TSF_CALCULATED_CHANNEL_INVALID_THIRDCHAN, currentLine, s)); }
                                break;
                            case TSFCalculatedChannelEntry.Fields.value:
                                try { cc.Value = Convert.ToDouble(s, invariant); }
                                catch (System.Exception) { errors.Add(new ReadTSFError(ReadTSFError.TSF_ERRORS.TSF_CALCULATED_CHANNEL_INVALID_VALUE, currentLine, s)); }
                                break;
                        }
                    }
                    calculatedChannels.Add(cc);
                }
                else { done = true; }
                CalculatedChannels = calculatedChannels.ToArray();
            }
        }
    }
}