using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using OfficeOpenXml;
using System.IO;
using System.Data;

namespace friction
{
	public class DataHandler
	{
		public class CalcResult
		{
			public int m_iCnt;
			public float m_fAvgRPN;
			public float m_fStdRPN;
			public float m_fDiffByForce;
			public float m_fDiffByTemp;
			public float m_fDiffByHumid;
			public float m_fDiffByVel;
		}

		public struct CHART
		{
			public float HUMIDITY;
			public float TEMPERATURE;
			public float RPN;

			override public string ToString()
			{
				return string.Format("Humi({0}) Temp({1}) RPN({2})", HUMIDITY, TEMPERATURE, RPN);
			}
		}


		DataTable m_Data = new DataTable();

		string m_strFileName = "";
		string m_strFilePath = "";

		List<string> m_ColumnsNames = new List<string>();
		List<string> m_ActiveColumns = new List<string>();
		List<string> m_NonactiveColumns = new List<string>();
		List<string> m_MaterialSpring = new List<string>();
		List<string> m_MaterialTable = new List<string>();

		Dictionary<string, string> m_ColumnMap = new Dictionary<string, string>();

		public DataHandler()
		{
			m_ColumnMap["spring"] = "Material spring";
			m_ColumnMap["table"] = "material 2 table";
			m_ColumnMap["rpn"] = "Risk priority number";
			m_ColumnMap["force"] = "normal force";
			m_ColumnMap["temp"] = "Temperature";
			m_ColumnMap["humidity"] = "Relative humidity";
			m_ColumnMap["velocity"] = "Relative velocity";
		}

		bool IsNumberColumn(string strColumn)
		{
			return (strColumn == m_ColumnMap["rpn"] ||
				strColumn == m_ColumnMap["force"] ||
				strColumn == m_ColumnMap["temp"] ||
				strColumn == m_ColumnMap["humidity"] ||
				strColumn == m_ColumnMap["velocity"]);
		}

		public void LoadData(string strFilePath)
		{
			using (ExcelPackage package = new ExcelPackage())
			{
				using (var stream = new FileStream(strFilePath, FileMode.Open, FileAccess.Read, FileShare.ReadWrite))
					package.Load(stream);
				ExcelWorksheet Sheet = package.Workbook.Worksheets[1];

				m_Data.Columns.Clear();
				m_Data.Rows.Clear();

				// read column
				for (int iCol = Sheet.Dimension.Start.Column; iCol <= Sheet.Dimension.End.Column; iCol++)
				{
					string strCol = (string)Sheet.Cells[Sheet.Dimension.Start.Row, iCol].Value;
					m_Data.Columns.Add(new DataColumn(strCol, IsNumberColumn(strCol) ? typeof(float) : typeof(string)));
				}

				// read data
				for (int iRow = Sheet.Dimension.Start.Row + 1; iRow <= Sheet.Dimension.End.Row; iRow++)
				{
					DataRow newRow = m_Data.NewRow();

					for (int iCol = Sheet.Dimension.Start.Column; iCol <= Sheet.Dimension.End.Column; iCol++)
					{
						var value = Sheet.Cells[iRow, iCol].Value;
						if (m_Data.Columns[iCol-1].DataType == typeof(float))
						{
							float fData = 0;
							if(value != null)
								fData = (float)(double)value;
							newRow[iCol - 1] = fData;
						}
						else
						{
							string strData = "";
							if (value != null)
							{
								strData = value.ToString();
								strData = strData.Trim();
							}

							newRow[iCol - 1] = strData;
						}
					}

					m_Data.Rows.Add(newRow);
				}

				m_strFilePath = strFilePath;
				int iSeperate = strFilePath.LastIndexOf('\\');
				m_strFileName = strFilePath.Substring(iSeperate+1);
			}


			m_MaterialSpring = (from r in m_Data.AsEnumerable()
						   select r[m_ColumnMap["spring"]]).Distinct().Cast<string>().ToList();

			m_MaterialTable = (from r in m_Data.AsEnumerable()
						   select r[m_ColumnMap["table"]]).Distinct().Cast<string>().ToList();

			m_ColumnsNames = (from c in m_Data.Columns.Cast<DataColumn>()
						 select c.ColumnName).ToList<string>();


			m_ActiveColumns.Clear();
			m_NonactiveColumns.Clear();
			for (int i=0; i< m_ColumnsNames.Count; i++)
			{
				if(m_Data.Columns[i].DataType == typeof(string))
				{
					if(m_Data.AsEnumerable().Any(r => (string)r[i] != ""))
						m_ActiveColumns.Add(m_ColumnsNames[i]);
					else
						m_NonactiveColumns.Add(m_ColumnsNames[i]);
				}
				else
				{
					m_ActiveColumns.Add(m_ColumnsNames[i]);
				}
			}
		}

		public void SetSelectedMaterial(string strSpring, string strTable)
		{
			m_strCurSpring = strSpring;
			m_strCurTable = strTable;
		}

		public string GetCurSpring()
		{
			return m_strCurSpring;
		}

		public string GetCurTable()
		{
			return m_strCurTable;
		}

		public List<CHART> GetHumidityChart(string strSpring, string strTable)
		{
			string strQuery = string.Format("[{0}]='{1}' and [{2}]='{3}'", m_ColumnMap["spring"], strSpring, m_ColumnMap["table"], strTable);
			DataRow[] rows = m_Data.Select(strQuery);

			List<CHART> result = new List<CHART>();
			foreach(DataRow r in rows)
			{
				result.Add(new CHART
				{
					HUMIDITY = (float)r[m_ColumnMap["humidity"]],
					TEMPERATURE = (float)r[m_ColumnMap["temp"]],
					RPN = (float)r[m_ColumnMap["rpn"]],
				});
			}

			return result;
		}


		#region calculation
		public CalcResult GetCalc(string strSpring, string strTable)
		{
			CalcResult result = new CalcResult();

			string strQuery = string.Format("[{0}]='{1}' and [{2}]='{3}'", m_ColumnMap["spring"], strSpring, m_ColumnMap["table"], strTable);
			DataRow[] rows = m_Data.Select(strQuery);

			result.m_iCnt = rows.Length;
			result.m_fAvgRPN = rows.Average(r => (float)r[m_ColumnMap["rpn"]]);
			result.m_fStdRPN = rows.Average(r => (float)Math.Pow((float)r[m_ColumnMap["rpn"]] - result.m_fAvgRPN, 2));
			result.m_fStdRPN = (float)Math.Sqrt(result.m_fStdRPN);

			var aa = rows
				.GroupBy(r => r[m_ColumnMap["force"]])
				.Select(t => t.Average(k => (float)k[m_ColumnMap["rpn"]]));

			//foreach( var a in aa )
			//{
			//	float fForce = (float)a.Key;
			//	float fAvg = a.Average(r => (float)r[m_ColumnMap["rpn"]]);
			//}

				//.Min(r => (float)r[m_ColumnMap["rpn"]]);
			//aa.Min()
			//float fMin = rows.GroupBy(r => r[m_ColumnMap["force"]])..Min(r => r[m_ColumnMap["rpn"]]);

			return result;
		}
		#endregion


		#region get
		public DataTable GetData()
		{
			return m_Data;
		}

		public string GetFilePath()
		{
			return m_strFilePath;
		}

		public string GetFileName()
		{
			return m_strFileName;
		}

		public List<string> GetMaterialSpring()
		{
			return m_MaterialSpring;
		}

		public List<string> GetMaterialTable()
		{
			return m_MaterialTable;
		}

		public List<string> GetColumns()
		{
			return m_ColumnsNames;
		}

		public List<string> GetActiveColumns()
		{
			return m_ActiveColumns;
		}

		public List<string> GetNonactiveColumns()
		{
			return m_NonactiveColumns;
		}
		#endregion
	}
}