///
/// Copyright (c) 2013-2015 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.ResultsWriters.Basic
{
	public class Writer : ComponentBase, IOperation, GenericDevices.IResultsWriter
	{
		private static readonly ILog log = LogManager.GetLogger(typeof(Writer));
		public override string ToString() { return string.Format("ResultsWriters.Basic({0})", Cfg.ToString(1)); }

		readonly WriterCfg writerCfg;
		readonly string separatorStr;

		/// <summary>
		/// Result items to print
		/// </summary>
        IList<Results.ItemSpec> 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 "\\";
			Directory.CreateDirectory(directory);

			if (writerCfg.YearFolders)
			{
				directory = string.Format("{0}{1}\\", directory, time.Year.ToString());
				Directory.CreateDirectory(directory);
			}

			if (writerCfg.MonthFolders)
			{
				string monthStr /* = now.Month.ToString("D2")*/;
				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);
				Directory.CreateDirectory(directory);
			}

			if (writerCfg.DayFolders)
			{
				directory = string.Format("{0}{1}\\", directory, time.Day.ToString("D2"));
				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 && !batch.WaterMeters[0].Compound())
			{
				rsltItems = Results.ItemSpec.FromStrArray(Program.LocalSettings.RsltItems_Printer_SingleWM);
			}
			else
			{
				rsltItems = Results.ItemSpec.FromStrArray(Program.LocalSettings.RsltItems_Printer_CombinedWM);
			}

            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) return;

			///----------
			///  Header
			///----------
			writer.WriteLine(batch.ProtocolTitle);
			writer.WriteLine(string.Empty);

			string[] leftColumn = new string[]
				{
					"Batch number: ",
					"Date and time: ",
					"Procedure:",
					Strings.User_,
					"Ambient temperature: ",
					"Ambient pressure: ",
					"Ambient humidity: ",
				};

			string[] rightColumn = new string[]
				{
					batch.BatchNr.ToString(),
					//batch.EndTime.ToShortDateString() + "  " + batch.EndTime.ToShortTimeString(),
					string.Format("{0}.{1}.{2}  {3}:{4}", batch.EndTime.Year.ToString("D4"),
														  batch.EndTime.Month.ToString("D2"),
														  batch.EndTime.Day.ToString("D2"),
														  batch.EndTime.Hour.ToString("D2"),
														  batch.EndTime.Minute.ToString("D2")),
					batch.ProcedureName,
					batch.UserName,
					batch.AmbientTempAve().ToString("F1") + " °C",
					batch.AmbientPressAve().ToString("F0") + " mbar",
					batch.AmbientHumiAve().ToString("F0") + " %",
				};

			/// Determine max. left column width in characters
			int maxLen = 0;
			foreach (var s in leftColumn) if (s.Length > maxLen) maxLen = s.Length;

			/// Write aligned columns
			for (int i = 0; i < Math.Min(leftColumn.Length, rightColumn.Length); i++)
			{
				writer.Write(leftColumn[i]);
				writer.Write(new string(' ', maxLen - leftColumn[i].Length + 3));
				writer.WriteLine(rightColumn[i]);
			}
			writer.WriteLine(string.Empty);


			///--------
			///  Body
			///--------
			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)
		{
			/// Determine column widths
			int[] columnWidths = new int[rsltItems.Count];
			int totalWidth = 0;
			for (int i = 0; i < rsltItems.Count; i++)
			{
				columnWidths[i] = ElSpaces(rsltItems[i].ClmnHeaderText).Length;
				foreach (var mtr in wm.MeterTestRslts)
				{
					string itemText;

					if (!wm.Compound())
					{
						/// Single water meter
						itemText = rsltItems[i].Print(mtr);
					}
					else if (mtr.CompoundMeterId == (byte)CompoundMeterId.Compound)
					{
						Results.Entities.MeterTestRslt mainMtr = wm.GetMeterTestRslt(mtr.Name(), CompoundMeterId.CompoundMain);
						Results.Entities.MeterTestRslt auxMtr = wm.GetMeterTestRslt(mtr.Name(), CompoundMeterId.CompoundAux);
						itemText = rsltItems[i].PrintCombined(mainMtr, auxMtr, mtr);
					}
					else
					{
						continue;
					}

					/// Strip color information
					string[] texts = itemText.Split(new char[] { '|' });
					if (texts.Length == 2) { itemText = texts[0]; }

					int len = ElSpaces(itemText).Length;
					if (len > columnWidths[i]) columnWidths[i] = len;
				}
				totalWidth += columnWidths[i];
			}
			totalWidth += 3 * (rsltItems.Count - 1);
			if (totalWidth < 0) totalWidth = 0;


			/// Write water meter number and s/n
			writer.Write(string.Format("Water meter {0}", wm.WMPosition));
			if (!string.IsNullOrEmpty(wm.SerialNr)) writer.Write(string.Format("   s/n: {0}", wm.SerialNr));
			writer.WriteLine(string.Empty);

	
			writer.WriteLine(new String('-', totalWidth));		/// Horizontal line above the header


			/// Write column headers
			for (int i = 0; i < rsltItems.Count; i++)
			{
				writer.Write(ElSpaces(rsltItems[i].ClmnHeaderText));

				if (i < rsltItems.Count - 1)
				{
					if (!writerCfg.EliminateSpaces)
					{
						writer.Write(new string(' ', columnWidths[i] - rsltItems[i].ClmnHeaderText.Length + 3));
					}
					writer.Write(separatorStr);
				}
				else
				{
					writer.WriteLine(string.Empty);
				}
			}


			writer.WriteLine(new String('-', totalWidth));		/// Horizontal line between the header and the body
			

			/// Write table data
			foreach (var mtr in wm.MeterTestRslts)
			{
				if (mtr != null)
				{
					for (int i = 0; i < rsltItems.Count; i++)
					{
						string itemText;

						///
						/// Fetch an item
						/// 
						if (!wm.Compound())
						{
							/// Single water meter
							itemText = rsltItems[i].Print(mtr);
						}
						else if (mtr.CompoundMeterId == (byte)CompoundMeterId.Compound)
						{
							Results.Entities.MeterTestRslt mainMtr = wm.GetMeterTestRslt(mtr.Name(), CompoundMeterId.CompoundMain);
							Results.Entities.MeterTestRslt auxMtr = wm.GetMeterTestRslt(mtr.Name(), CompoundMeterId.CompoundAux);
							itemText = rsltItems[i].PrintCombined(mainMtr, auxMtr, mtr);
						}
						else
						{
							continue;
						}

						///
						/// Print the item
						///
						string[] texts = itemText.Split(new char[] { '|' });
						if (texts.Length == 2) { itemText = texts[0]; }		/// Strip color information

						writer.Write(ElSpaces(itemText));

						if (i < rsltItems.Count - 1)
						{
							if (!writerCfg.EliminateSpaces)
							{
								writer.Write(new string(' ', columnWidths[i] - itemText.Length + 3));
							}
							writer.Write(separatorStr);
						}
						else
						{
							writer.WriteLine(string.Empty);
						}
					}
				}
			}

			writer.WriteLine(new String('-', totalWidth));		/// Horizontal line below the body

			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;
		}
	}
}