///
/// Copyright (c) 2013-2016 Sensus Metering Systems
///
using System;
using System.Collections.Generic;
using System.IO;
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>
        IList<Results.WMeterRsltItemSpec> rsltItems;

		/// <summary>
		/// Results to print
		/// </summary>
		Results.Entities.Batch batch;

		StreamWriter writer;


		public Writer() {}

		public Writer(WriterCfg cfg)
            : base(cfg)
		{
			writerCfg = cfg;

			switch (cfg.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;
			}

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


		/// <summary>
		/// Eliminate spaces conditionally, depesing on bool WriterCfg.EliminateSpaces
		/// </summary>
		/// <param name="item">Input string</param>
		/// <returns>Output string</returns>
		string ElSpaces(string item)
		{
			if (writerCfg.EliminateSpaces)
				return item.Replace(" ", string.Empty);
			else
				return item;
		}


		/// <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(DateTime time)
		{
			string directory = writerCfg.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.DigitWithLeadingZero:
                    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.DigitWithLeadingZero:
				    directory = string.Format("{0}{1}\\", directory, time.Day.ToString("D2"));
                    break;
			}

            Directory.CreateDirectory(directory);

			return string.Format("{0}{1}{2}{3}-{4}{5}.txt", directory, (time.Year % 100).ToString("D2"),
				time.Month.ToString("D2"), time.Day.ToString("D2"), time.Hour.ToString("D2"), time.Minute.ToString("D2"));
		}

		/// <summary>
		/// Writes the test cycle results into a file,  Events:  Event.ResultsWritten
		/// </summary>
		/// <param name="procedure">Procedure to print the results of</param>
		/// <param name="unsortedResults">Results to write into the file</param>
		/// <returns>Reference to the operation</returns>
		public IOperation WriteResultsOp(Results.Entities.Batch batchResults)
		{
			this.batch = batchResults;

			if (batch.WaterMeters.Count <= 0)
			{
				writer = null;
				return this;
			}

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

            try
            {
				writer = new StreamWriter(System.IO.File.Create(GetFilename(batch.EndTime)));
            }
            catch
            {
                writer = null;
            }

			return this;
		}

		/// <summary>Start this operation</summary>
		public void Start()
		{
            if (writer == null || rsltItems == null || rsltItems.Count == 0) return;

			foreach (var wm in batch.WaterMeters) WriteWM(wm);
		}

		/// <summary>
		/// Write one water meter results
		/// </summary>
		/// <param name="wmNr">Water meter number (0-based)</param>
		void WriteWM(Results.Entities.WaterMeter wm)
		{
            for (int i = 0; i < rsltItems.Count; i++)
            {
                writer.Write(rsltItems[i].Print(wm));

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

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

		/// <summary>Stop this operation</summary>
		public void Stop()
		{
			if (writer != null) writer.Close();
			writer = null;
		}
	}
}