///
/// Copyright (c) 2013-2017 Sensus Metering Systems
///
using System;
using System.Collections.Generic;
using System.Globalization;
using System.IO;
using System.Threading;
using log4net;
using Config.Entities;
using TBF.BenchControl;
using TBF.Resources;

namespace TBF.BenchControl.Output.FileWriters.Basic
{
	public class Writer : ComponentBase, IOperation, GenericDevices.IResultsWriter
	{
		private static readonly ILog log = LogManager.GetLogger(typeof(Writer));
		public override string ToString() { return string.Format("Output.FileWriters.Basic({0})", Cfg.ToString(1)); }

		readonly WriterCfg writerCfg;
		readonly string separatorStr;

		/// <summary>
		/// Result items to print
		/// </summary>
        readonly IList<Results.WMeterRsltItemSpec> rsltItems;

		Results.Entities.Batch batch;

        bool abort;                 /// Set to 'true' by Stop() operation to abort writing to the file


		public Writer() {}

		public Writer(Generic.IComponentCfg cfg)
			: base(cfg)
		{
			writerCfg = cfg as WriterCfg;

			switch (writerCfg.Separator)
			{
				default:
				case Separator.None:		separatorStr = string.Empty;	break;
				case Separator.Space:		separatorStr = " ";				break;
				case Separator.Tabulator:	separatorStr = "\t";			break;
				case Separator.Comma:		separatorStr = ",";				break;
				case Separator.Semicolon:	separatorStr = ";";				break;
			}

            rsltItems = Results.WMeterRsltItemSpec.FromStrArray(writerCfg.SelectedItems);

			log.Debug(this.ToString());
		}


		/// <summary>
		/// Returns a file name derived from a DateTime structure.
		/// Creates directories on this path as a side effect.
		/// </summary>
		/// <param name="time">Date and time</param>
		/// <returns>File name</returns>
		string GetFilename(string destinationPath, DateTime time)
		{
			string directory = destinationPath;		    /// Ends with "\\";

			switch (writerCfg.YearFolders)
			{
                case YearFolders.FourDigit:
                    directory = string.Format("{0}{1}\\", directory, time.Year.ToString("D4"));
                    break;
                case YearFolders.TwoDigit:
                    directory = string.Format("{0}{1}\\", directory, (time.Year % 100).ToString("D2"));
                    break;
            }

			switch (writerCfg.MonthFolders)
			{
                case MonthFolders.Name:
                    {
                        string monthStr;
                        switch (time.Month)
                        {
                            default:
                            case 1: monthStr = "January"; break;
                            case 2: monthStr = "February"; break;
                            case 3: monthStr = "March"; break;
                            case 4: monthStr = "April"; break;
                            case 5: monthStr = "May"; break;
                            case 6: monthStr = "June"; break;
                            case 7: monthStr = "July"; break;
                            case 8: monthStr = "August"; break;
                            case 9: monthStr = "September"; break;
                            case 10: monthStr = "October"; break;
                            case 11: monthStr = "November"; break;
                            case 12: monthStr = "December"; break;
                        }
                        directory = string.Format("{0}{1}\\", directory, monthStr);
                        break;
                    }
                case MonthFolders.Digit:
                    directory = string.Format("{0}{1}\\", directory, time.Month.ToString());
                    break;
                case MonthFolders.TwoDigit:
                    directory = string.Format("{0}{1}\\", directory, time.Month.ToString("D2"));
                    break;
            }

			switch (writerCfg.DayFolders)
			{
                case DayFolders.Digit:
                    directory = string.Format("{0}{1}\\", directory, time.Day.ToString());
                    break;
                case DayFolders.TwoDigit:
				    directory = string.Format("{0}{1}\\", directory, time.Day.ToString("D2"));
                    break;
			}

            Directory.CreateDirectory(directory);

            try
            {
                if (string.IsNullOrEmpty(writerCfg.FileNameFormat)) throw new Exception();
                return directory + string.Format(writerCfg.FileNameFormat, time);
            }
            catch
            {
                return string.Format("{0}{1:yyMMdd-HHmm}.txt", directory, time);
            }
		}

		/// <summary>
		/// Writes the test cycle results into a file
		/// Events:
		///		Event.ResultsWritten
		///		Event.Busy
		/// </summary>
		/// <param name="batch">Results to write into a file</param>
		/// <returns>Reference to the operation</returns>
		public IOperation WriteResultsOp(Results.Entities.Batch batch)
		{
			this.batch = batch;
			return this;
		}

		/// <summary>Start this operation</summary>
		public void Start()
		{
			CultureInfo oriCulture = Thread.CurrentThread.CurrentCulture;

			try { Thread.CurrentThread.CurrentCulture = new CultureInfo(writerCfg.Culture.ToString()); }
			catch { }

			WriteRslts(batch, writerCfg.DestinationPath);
			WriteRslts(batch, writerCfg.DestinationPath2);

			Thread.CurrentThread.CurrentCulture = oriCulture;
		}

        /// <summary>Run this operation</summary>
        /// <returns>Event.ResultsWritten</returns>
        public Event Run()
        {
			return Event.ResultsWritten;
		}

        /// <summary>Stop this operation</summary>
        public void Stop()
        {
        }


        void WriteRslts(Results.Entities.Batch batch, string destination)
        {
            if (batch == null || batch.WaterMeters == null || batch.WaterMeters.Count <= 0) return;
            if (rsltItems == null || rsltItems.Count == 0) return;

            StreamWriter writer = StreamWriter.Null;
            if (!string.IsNullOrEmpty(writerCfg.DestinationPath))
            {
                try
                {
                    writer = File.AppendText(GetFilename(writerCfg.DestinationPath, batch.EndTime));
                }
                catch
                {
                }
            }

            foreach (var wm in batch.WaterMeters)
            {
                if (!writerCfg.SaveGoodOnly || wm.Passed)
                {
                    WriteWM(writer, wm);
                    if (abort) return;
                }
            }

            writer.Close();
        }

		/// <summary>
		/// Write one water meter results
		/// </summary>
		/// <param name="wmNr">Water meter number (0-based)</param>
		void WriteWM(StreamWriter wr, Results.Entities.WaterMeter wm)
		{
            for (int i = 0; i < rsltItems.Count; i++)
            {
                if (abort) return;

                wr.Write(rsltItems[i].Print(wm));

                if (i < rsltItems.Count - 1)
                {
                    wr.Write(separatorStr);
                }
                else
                {
                    wr.WriteLine(string.Empty);
                }
            }
		}
	}
}