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

namespace DTS.SensorDB.TSF
{
    /// <summary>
    /// the G5 Digital Input Channels section of the TSF
    /// </summary>
    public class TSFG5DigitalInputSection
    {
        private const string SECTION_START_HEADER = "---- G5 Digital Input Channels Begin ----";
        private const string COLUMN_HEADER = "datachan,rack,mod,chan,descrip,ISOCode,scale,invert";
        private const string SECTION_END_HEADER = "---- G5 Digital Input Channels End ----";

        private List<G5DigtalInputChannelTSFEntry> _digitalInputChannels = new List<G5DigtalInputChannelTSFEntry>();
        public G5DigtalInputChannelTSFEntry[] DigitalInputChannels
        {
            get { return _digitalInputChannels.ToArray(); }
            set { _digitalInputChannels = new List<G5DigtalInputChannelTSFEntry>(value); }
        }

        public void ReadFrom(List<string> lines, ref int currentLine, ref List<ReadTSFError> errors)
        {
            if (currentLine == lines.Count)
            {
                //errors.Add(new ReadTSFError(ReadTSFError.TSF_ERRORS.TSF_UNEXPECTED_EOF, currentLine));
                return;
            }
            string sectionStart = lines[currentLine++];
            if (sectionStart != SECTION_START_HEADER)
            {
                errors.Add(new ReadTSFError(ReadTSFError.TSF_ERRORS.G5DIGITALINPUTSECTION_START_INVALID_HEADER, currentLine, sectionStart));
                return;
            }

            if (currentLine == lines.Count)
            {
                errors.Add(new ReadTSFError(ReadTSFError.TSF_ERRORS.TSF_UNEXPECTED_EOF, currentLine));
                return;
            }
            string columnHeader = lines[currentLine++];
            if (columnHeader != COLUMN_HEADER)
            {
                errors.Add(new ReadTSFError(ReadTSFError.TSF_ERRORS.G5DIGITALINPUTSECTION_COLUMN_INVALID_HEADER, currentLine, columnHeader));
                return;
            }

            List<G5DigtalInputChannelTSFEntry> g5DigitalInputChannels = new List<G5DigtalInputChannelTSFEntry>();
            bool done = false;
            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("G5 Digital Input Channels End"))
                {
                    G5DigtalInputChannelTSFEntry ichan = new G5DigtalInputChannelTSFEntry();
                    string[] tokens = line.Split(new char[] { ',' });
                    for (int iCurField = 0; iCurField < tokens.Length; iCurField++)
                    {
                        string s = tokens[iCurField];
                        G5DigtalInputChannelTSFEntry.Fields field = (G5DigtalInputChannelTSFEntry.Fields)iCurField;
                        switch (field)
                        {
                            case G5DigtalInputChannelTSFEntry.Fields.chan:
                                try { ichan.Chan = Convert.ToInt32(s); }
                                catch (System.Exception) { errors.Add(new ReadTSFError(ReadTSFError.TSF_ERRORS.TSF_G5DIGITALCHANNEL_INVALID_CHAN, currentLine, s)); }
                                break;
                            case G5DigtalInputChannelTSFEntry.Fields.datachan:
                                try { ichan.DataChan = Convert.ToInt32(s); }
                                catch (System.Exception) { errors.Add(new ReadTSFError(ReadTSFError.TSF_ERRORS.TSF_G5DIGITALCHANNEL_INVALID_DATACHAN, currentLine, s)); }
                                break;
                            case G5DigtalInputChannelTSFEntry.Fields.descrip: ichan.Descripton = s; break;
                            case G5DigtalInputChannelTSFEntry.Fields.invert:
                                try
                                {
                                    switch (s)
                                    {
                                        case "0":
                                        case "F":
                                        case "N":
                                            ichan.Invert = false; break;

                                        case "1":
                                        case "T":
                                        case "Y":
                                            ichan.Invert = true; break;

                                        default:
                                            {
                                                errors.Add(new ReadTSFError(ReadTSFError.TSF_ERRORS.TSF_G5DIGITALCHANNEL_INVALID_INVERT, currentLine, s));
                                            }
                                            break;
                                    }
                                }
                                catch (System.Exception) { errors.Add(new ReadTSFError(ReadTSFError.TSF_ERRORS.TSF_G5DIGITALCHANNEL_INVALID_INVERT, currentLine, s)); }
                                break;
                            case G5DigtalInputChannelTSFEntry.Fields.ISOCode: ichan.ISOCode = s; break;
                            case G5DigtalInputChannelTSFEntry.Fields.mod:
                                try { ichan.Module = Convert.ToInt32(s); }
                                catch (System.Exception) { errors.Add(new ReadTSFError(ReadTSFError.TSF_ERRORS.TSF_G5DIGITALCHANNEL_INVALID_MODULE, currentLine, s)); }
                                break;
                            case G5DigtalInputChannelTSFEntry.Fields.rack:
                                try { ichan.Rack = Convert.ToInt32(s); }
                                catch (System.Exception) { errors.Add(new ReadTSFError(ReadTSFError.TSF_ERRORS.TSF_G5DIGITALCHANNEL_INVALID_RACK, currentLine, s)); }
                                break;
                            case G5DigtalInputChannelTSFEntry.Fields.scale:
                                try { ichan.Scale = Convert.ToDouble(s); }
                                catch (System.Exception) { errors.Add(new ReadTSFError(ReadTSFError.TSF_ERRORS.TSF_G5DIGITALCHANNEL_INVALID_SCALE, currentLine, s)); }
                                break;
                            default: throw new NotSupportedException("TSFFile::ReadTSF invalid G5DigitalInput field: " + field.ToString());
                        }
                    }
                    g5DigitalInputChannels.Add(ichan);
                }
                else { done = true; }
            }
            DigitalInputChannels = g5DigitalInputChannels.ToArray();
        }
    }
}