/*****************************************************************************
 * 
 * ReoGrid - .NET Spreadsheet Control
 * 
 * http://reogrid.net/
 *
 * THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY
 * KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A PARTICULAR
 * PURPOSE.
 *
 * Author: Jing Lu <lujing at unvell.com>

 * Copyright (c) 2012-2016 Jing <lujing at unvell.com>
 * Copyright (c) 2012-2016 unvell.com, all rights reserved.
 * 
 ****************************************************************************/

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

#if DEBUG
using System.Diagnostics;
#endif // DEBUG

#if WINFORM || ANDROID
using RGFloat = System.Single;
#elif WPF
using RGFloat = System.Double;
#elif iOS
using RGFloat = System.Double;
#endif // WINFORM

#if EX_SCRIPT
using unvell.ReoScript;
using unvell.ReoGrid.Script;
#endif // EX_SCRIPT

using unvell.Common;

using unvell.ReoGrid.Core;
using unvell.ReoGrid.CellTypes;
using unvell.ReoGrid.DataFormat;
using unvell.ReoGrid.Events;

#if FORMULA
using unvell.ReoGrid.Formula;
#endif // FORMULA

using unvell.ReoGrid.Utility;
using unvell.ReoGrid.Graphics;

namespace unvell.ReoGrid
{
	partial class Worksheet
	{
		#region Set Data

		/// <summary>
		/// Set data of cell at specified position on worksheet.
		/// </summary>
		/// <param name="addressOrName">Address or name to locate the cell.</param>
		/// <param name="data">Data to be set.</param>
		public void SetCellData(string addressOrName, object data)
		{
			NamedRange range;

			if (CellPosition.IsValidAddress(addressOrName))
			{
				SetCellData(new CellPosition(addressOrName), data);
			}
			else if (this.registeredNamedRanges.TryGetValue(addressOrName, out range))
			{
				SetCellData(range.StartPos, data);
			}
			else
				throw new InvalidAddressException(addressOrName);
		}

		/// <summary>
		/// Set data of cell at specified position on worksheet.
		/// </summary>
		/// <param name="pos">Position of cell to set data.</param>
		/// <param name="data">Data of cell to be set.</param>
		public void SetCellData(CellPosition pos, object data)
		{
			SetCellData(pos.Row, pos.Col, data);
		}

		/// <summary>
		/// Set data of cell at specified position on worksheet.
		/// </summary>
		/// <param name="row">Index of row of specified cell.</param>
		/// <param name="col">Index of column of specified cell.</param>
		/// <param name="data">Data of cell.</param>
		public void SetCellData(int row, int col, object data)
		{
			if (row < 0 || row > this.rows.Count - 1)
				throw new ArgumentOutOfRangeException("row",
					"Number of row is out of the maximum rows, use either AppendRows or Resize to expend this worksheet.");

			if (col < 0 || col > this.cols.Count - 1)
				throw new ArgumentOutOfRangeException("col",
					"Number of column is out of maximum columns, use either AppendCols or Resize to expend this worksheet.");

			if (data is Array)
			{
				var arr = (Array)data;

				if (arr.Rank == 1)
				{
					for (int c = col; c < Math.Min(col + arr.Length, this.cols.Count); c++)
					{
						SetCellData(row, c, arr.GetValue(c - col));
					}
				}
				else if (arr.Rank == 2)
				{
					int rows = arr.GetLength(0);
					int cols = arr.GetLength(1);
					SetRangeData(new RangePosition(row, col, rows, cols), arr);
				}
				else
					throw new ArgumentException("Array with more than 2 ranks is not supported.");
			}
			else if (data is IEnumerable<object>)
			{
				var elements = (IEnumerable<object>)data;

				int c = col;
				foreach (var ele in elements)
				{
					SetCellData(row, c, ele);
					c++;
					if (c >= this.cols.Count) break;
				}
			}
			else if (data is PartialGrid)
			{
				var subgrid = (PartialGrid)data;

				var range = new RangePosition(row, col, subgrid.Rows, subgrid.Columns);
				SetPartialGrid(range, subgrid);
			}
			else if (data is System.Data.DataTable)
			{
				var dt = (System.Data.DataTable)data;
				SetRangeData(new RangePosition(row, col, dt.Rows.Count, dt.Columns.Count), dt);
			}
			else
			{
				var cell = cells[row, col];

				// both data and cell is null, then no need to update
				if ((data != null || cell != null)

					// if cell is not null, and it is valid (not merged by other cells), then need to update
					&& (cell == null || cell.IsValidCell))
				{
					SetSingleCellData(CreateAndGetCell(row, col), data);
				}
			}
		}

		/// <summary>
		/// Set data of cell at specified position on worksheet.
		/// </summary>
		/// <param name="cell">Instance of cell.</param>
		/// <param name="data">Data to be set.</param>
		internal void SetSingleCellData(Cell cell, object data)
		{
			// set cell body
			if (data is ICellBody)
			{
				SetCellBody(cell, (ICellBody)data);

				data = cell.InnerData;
			}

			if (data is string || data is StringBuilder
#if EX_SCRIPT
 || data is StringObject
#endif // EX_SCRIPT
)
			{
				string str = data is string ? (string)(data) : Convert.ToString(data);

				// cell data processed as plain-text
				if (str.Length > 1)
				{
					if (str[0] == '\'')
					{

#if FORMULA
						// clear old references
						ClearCellReferenceList(cell);

						// clear dependents arrows
						RemoveCellTraceDependents(cell);

						// clear precedents arrow
						RemoveCellTracePrecedents(cell);

						// clear formula status
						cell.formulaStatus = FormulaStatus.Normal;

#endif // FORMULA

						cell.InnerData = data;
						cell.InnerDisplay = str.Substring(1);

						AfterCellDataUpdate(cell);
						return;
					}

#if FORMULA
					if (str[0] == '=')
					{
						SetCellFormula(cell, str.Substring(1));

						try
						{
							RecalcCell(cell);
						}
						catch (Exception ex)
						{
							this.NotifyExceptionHappen(ex);
						}

						return;
					}
#endif // FORMULA

				}
			}

#if FORMULA
			if (formulaRanges.Count > 0)
			{
				// clear old references
				ClearCellReferenceList(cell);
			}

			// clear cell formula
			cell.InnerFormula = null;

			// clear formula status
			cell.formulaStatus = FormulaStatus.Normal;

#endif // FORMULA

			UpdateCellData(cell, data);
		}

		/// <summary>
		/// Update data for cell without doing any format and formula evalution.
		/// </summary>
		/// <param name="cell">cell to be updated</param>
		/// <param name="data">data to be updated</param>
		/// <param name="dirtyCellStack">A stack to save cells that is marked as dirty cell, the dirty cell will be updated delay</param>
		internal void UpdateCellData(Cell cell, object data, Stack<List<Cell>> dirtyCellStack = null)
		{
			if (cell.body != null)
			{
				data = cell.body.OnSetData(data);
			}

			cell.InnerData = data;

			if (this.HasSettings(WorksheetSettings.Edit_AutoFormatCell))
			{
				DataFormatterManager.Instance.FormatCell(cell);
			}
			else
			{
				cell.InnerDisplay = Convert.ToString(data);
			}

#if WPF
			cell.formattedText = null;

			//if (cell.FormattedText == null || cell.FormattedText.Text != cell.InnerDisplay)
			//{
			//	float fontSize = cell.InnerStyle.FontSize * this.scaleFactor * (96f / 72f);

			//	cell.FormattedText = new System.Windows.Media.FormattedText(cell.InnerDisplay, 
			//		System.Globalization.CultureInfo.CurrentCulture,
			//		System.Windows.FlowDirection.LeftToRight,
			//		ResourcePoolManager.Instance.GetTypeface(cell.InnerStyle.FontName),
			//		fontSize,
			//		ResourcePoolManager.Instance.GetBrush(cell.InnerStyle.TextColor));
			//}
#endif

			AfterCellDataUpdate(cell, dirtyCellStack);
		}

		internal bool viewDirty = false;

		private void AfterCellDataUpdate(Cell cell, Stack<List<Cell>> dirtyCellStack = null)
		{
#if FORMULA
			if ((this.settings & WorksheetSettings.Formula_AutoUpdateReferenceCell)
				== WorksheetSettings.Formula_AutoUpdateReferenceCell)
			{
				UpdateReferencedFormulaCells(cell, dirtyCellStack);
			}
#endif // FORMULA

			if (cell.Data is Drawing.RichText)
			{
				var rt = (Drawing.RichText)cell.Data;

				rt.SuspendUpdateText();
				rt.Size = cell.Bounds.Size;
				rt.TextWrap = cell.InnerStyle.TextWrapMode;
				rt.ResumeUpdateText();
				rt.UpdateText();
			}
			else
			{
				cell.FontDirty = true;
			}

			if (this.controlAdapter != null
				&& !this.viewDirty
				&& !this.suspendDataChangedEvent)
			{
				this.RequestInvalidate();
			}

			if (!this.suspendDataChangedEvent)
			{
				var header = this.cols[cell.Column];

				if (header.Body != null)
				{
					header.Body.OnDataChange(cell.Row, cell.Row);
				}

				// raise text changed event
				RaiseCellDataChangedEvent(cell);
			}
		}

		#endregion // Set Data

		#region Set/Remove CellBody

		/// <summary>
		/// Set body of cell at specified position of grid
		/// </summary>
		/// <param name="row">number of row</param>
		/// <param name="col">number of column</param>
		/// <param name="body">body to be set</param>
		public void SetCellBody(int row, int col, ICellBody body)
		{
			if (row < 0) throw new ArgumentOutOfRangeException("row");
			if (row >= this.cells.RowCapacity) throw new ArgumentOutOfRangeException("row");
			if (col < 0) throw new ArgumentOutOfRangeException("col");
			if (col >= this.cells.ColCapacity) throw new ArgumentOutOfRangeException("col");

			var cell = this.cells[row, col];

			if (cell == null)
			{
				if (body == null)
				{
					return;
				}
				else
				{
					cell = CreateCell(row, col);
				}
			}

			SetCellBody(cell, body);
		}

		public void SetCellBody(CellPosition pos, ICellBody body)
		{
			pos = this.FixPos(pos);
			this.SetCellBody(pos.Row, pos.Col, body);
		}

		public void SetCellBody(string address, ICellBody body)
		{
			if (!CellPosition.IsValidAddress(address))
				throw new InvalidAddressException(address);

			this.SetCellBody(new CellPosition(address), body);
		}

		/// <summary>
		/// Set body of cell into specified row
		/// </summary>
		/// <param name="cell">cell to be set</param>
		/// <param name="body">body to be set</param>
		internal void SetCellBody(Cell cell, ICellBody body)
		{
			cell.Body = body;

			//if (body != null)
			//{
			//	body.OnSetup(cell);

			//	// why?
			//	UpdateCellFont(cell);
			//}

			//cell.UpdateContentBounds();

			RequestInvalidate();
		}

		/// <summary>
		/// Remove cell body from specified cell
		/// </summary>
		/// <param name="pos">position of specified cell</param>
		public void RemoveCellBody(CellPosition pos)
		{
			RemoveCellBody(pos.Row, pos.Col);
		}

		/// <summary>
		/// Remove cell body from specified cell
		/// </summary>
		/// <param name="row">number of row</param>
		/// <param name="col">number of column</param>
		public void RemoveCellBody(int row, int col)
		{
			var cell = cells[row, col];
			if (cell != null)
			{
				cell.body = null;
				RequestInvalidate();
			}
		}

		#endregion // Set/Remove CellBody

		#region Get Data/Text

		/// <summary>
		/// Get cell data from specified address or name
		/// </summary>
		/// <param name="addressOrName">address or name to locate a cell</param>
		/// <returns>data from cell</returns>
		/// <exception cref="InvalidAddressException">throw if specified address or name is invalid</exception>
		public object GetCellData(string addressOrName)
		{
			if (CellPosition.IsValidAddress(addressOrName))
			{
				return GetCellData(new CellPosition(addressOrName));
			}

			NamedRange range;
			if (this.registeredNamedRanges.TryGetValue(addressOrName, out range))
			{
				return GetCellData(range.StartPos);
			}

			throw new InvalidAddressException(addressOrName);
		}

		/// <summary>
		/// Get data from specified cell
		/// </summary>
		/// <param name="pos">Position of cell to get data</param>
		/// <returns>Data of cell</returns>
		public object GetCellData(CellPosition pos) { return GetCellData(pos.Row, pos.Col); }

		/// <summary>
		/// Get data from specified cell
		/// </summary>
		/// <param name="row">zero-based number of row</param>
		/// <param name="col">zero-based number of column</param>
		/// <returns>data of cell</returns>
		public object GetCellData(int row, int col)
		{
			if (row < 0 || row >= this.rows.Count) return null;
			if (col < 0 || col >= this.cols.Count) return null;

			var cell = cells[row, col];
			return (cell == null) ? null : cell.InnerData;
		}

		/// <summary>
		/// Get data from specified cell
		/// </summary>
		/// <param name="addressOrName">address or name to locate the cell</param>
		/// <returns>data of cell</returns>
		/// <exception cref="InvalidAddressException">throw if specified address or name is invalid</exception>
		public T GetCellData<T>(string addressOrName)
		{
			if (CellPosition.IsValidAddress(addressOrName))
			{
				return GetCellData<T>(new CellPosition(addressOrName));
			}

			NamedRange range;
			if (this.registeredNamedRanges.TryGetValue(addressOrName, out range))
			{
				return GetCellData<T>(range.StartPos);
			}

			throw new InvalidAddressException(addressOrName);
		}

		/// <summary>
		/// Get data from specified cell
		/// </summary>
		/// <param name="pos">position to locate the cell</param>
		/// <returns>data of cell</returns>
		public T GetCellData<T>(CellPosition pos)
		{
			return CellUtility.ConvertData<T>(this.GetCellData(pos));
		}

		/// <summary>
		/// Get data in specified type from a cell
		/// </summary>
		/// <typeparam name="T">type of data will be converted into</typeparam>
		/// <param name="row">number of row to locate a cell</param>
		/// <param name="col">number of column to locate a cell</param>
		/// <returns></returns>
		public T GetCellData<T>(int row, int col)
		{
			return CellUtility.ConvertData<T>(this.GetCellData(row, col));
		}

		/// <summary>
		/// Try get number data from cell at specified position. If the data is string, 
		/// this method will try to convert the string into number value.
		/// </summary>
		/// <param name="row">Number of row of the cell to get data.</param>
		/// <param name="col">Number of column of the cell to get data.</param>
		/// <param name="val">Number data returned and converted from cell.</param>
		/// <returns>True if data can be get and converted; Otherwise return false.</returns>
		public bool TryGetNumberData(int row, int col, out double val)
		{
			var cell = this.cells[row, col];

			if (cell == null)
			{
				val = 0;
				return false;
			}

			return CellUtility.TryGetNumberData(cell.Data, out val);
		}

		/// <summary>
		/// Get cell display text by specified address
		/// </summary>
		/// <param name="address">address to locate a cell</param>
		/// <returns>display text in string returned from specified cell</returns>
		public string GetCellText(string address)
		{
			NamedRange range;

			if (CellPosition.IsValidAddress(address))
			{
				return GetCellText(new CellPosition(address));
			}
			else if (RangePosition.IsValidAddress(address))
			{
				return GetCellText((new RangePosition(address)).StartPos);
			}
			else if (NamedRange.IsValidName(address)
				&& this.TryGetNamedRange(address, out range))
			{
				return GetCellText(range.StartPos);
			}
			else
				throw new InvalidAddressException(address);
		}

		/// <summary>
		/// Get formatted cell text from spcified position
		/// </summary>
		/// <param name="pos">position to be get</param>
		/// <returns>formatted cell's text</returns>
		public string GetCellText(CellPosition pos)
		{
			return GetCellText(pos.Row, pos.Col);
		}

		/// <summary>
		/// Get formatted cell text from specified position
		/// </summary>
		/// <param name="row">Row of position</param>
		/// <param name="col">Col of position</param>
		/// <returns>Text of cell</returns>
		public string GetCellText(int row, int col)
		{
			var cell = cells[row, col];
			if (cell == null) return string.Empty;
			return string.IsNullOrEmpty(cell.DisplayText) ? string.Empty : cell.DisplayText;
		}

		#endregion // Get Data/Text

		/// <summary>
		/// Determine whether or not to suspend all data changing event. Suspend this event when 
		/// update lot of data into spreadsheet will help to speed up the data updating process.
		/// Note: make sure this flag can be restored for event invoke.
		/// </summary>
		private bool suspendDataChangedEvent;

		/// <summary>
		/// Suspend all data changing events, from both cell and range.
		/// </summary>
		public void SuspendDataChangedEvents()
		{
			this.suspendDataChangedEvent = true;
		}

		/// <summary>
		/// Resume all data changing events.
		/// </summary>
		public void ResumeDataChangedEvents()
		{
			this.suspendDataChangedEvent = false;
			this.RequestInvalidate();
		}

		internal void RaiseCellDataChangedEvent(Cell cell)
		{
			if (CellDataChanged != null) CellDataChanged(this, new CellEventArgs(cell));

#if EX_SCRIPT
			RaiseScriptEvent("ondatachange", new RSCellObject(this, cell.InternalPos, cell));
#endif
		}

		/// <summary>
		/// Event raised when any data has been changed
		/// </summary>
		public event EventHandler<CellEventArgs> CellDataChanged;
	}

	#region Cell

	/// <summary>
	/// Represents the cell on worksheet. Cell instances are fully managed
	/// by ReoGrid core. To create custom cell, use <code>CellBody</code> class or </code>ICellBody</code> interface instead.
	/// </summary>
	/// <seealso cref="CellBody"/>
	/// <seealso cref="ICellBody"/>
	public partial class ReoGridCell : Cell
	{
		internal ReoGridCell(Worksheet worksheet)
			: base(worksheet)
		{
		}
	}

	/// <summary>
	/// Represents the cell on worksheet. Cell instances are fully managed
	/// by ReoGrid core. To create custom cell, use <code>CellBody</code> class or </code>ICellBody</code> interface instead.
	/// </summary>
	/// <seealso cref="CellBody"/>
	/// <seealso cref="ICellBody"/>
	[Serializable]
	public partial class Cell //: IFormulaSource
	{
		#region Constructor

		/// <summary>
		/// Instance of worksheet that the cell belongs to
		/// </summary>
		[NonSerialized]
		private Worksheet worksheet;

		/// <summary>
		/// Get the worksheet that is the owner of this cell
		/// </summary>
		public Worksheet Worksheet { get { return this.worksheet; } }

		/// <summary>
		/// Construct cell instance with specified owner grid instance.
		/// Cell instance managed by ReoGrid core, it cannot be created by user-code.
		/// </summary>
		/// <param name="worksheet">Owner grid control for this cell</param>
		internal Cell(Worksheet worksheet)
		{
			this.worksheet = worksheet;
			this.FontDirty = true;
		}
		#endregion // Constructor

		#region Position

		internal CellPosition InternalPos;

		internal int InternalRow
		{
			get { return this.InternalPos.Row; }
			set { this.InternalPos.Row = value; }
		}

		internal int InternalCol
		{
			get { return this.InternalPos.Col; }
			set { this.InternalPos.Col = value; }
		}

		/// <summary>
		/// Get zero-based row index of this cell
		/// </summary>
		public int Row { get { return this.InternalPos.Row; } }

		/// <summary>
		/// Get zero-based column index of this cell
		/// </summary>
		public int Column { get { return this.InternalPos.Col; } }

		/// <summary>
		/// Get position of this cell.
		/// </summary>
		public CellPosition Position { get { return this.InternalPos; } }

		/// <summary>
		/// Get position as a range position which contains the cell rowspan and colspan.
		/// This property is useful when the cell is a merged cell.
		/// </summary>
		public RangePosition PositionAsRange
		{
			get
			{
				return new RangePosition(this.InternalRow, this.InternalCol, this.rowspan, this.colspan);
			}
		}

		/// <summary>
		/// Get address string of this cell
		/// </summary>
		public string Address
		{
			get
			{
				return RGUtility.ToAddress(this.InternalPos.Row, this.InternalPos.Col);
			}
		}
		//internal ReferenceRange ReferenceRange { get; set; }

		//public ReferenceRange GetContainedRange(){return this.ReferenceRange;}
		#endregion // Postion

		#region Rowspan & Colspan
		private short colspan;
		internal short Colspan
		{
			get { return colspan; }
			set { colspan = value; }
		}

		private short rowspan;
		internal short Rowspan
		{
			get { return rowspan; }
			set { rowspan = value; }
		}

		/// <summary>
		/// Get number of colspan
		/// </summary>
		/// <returns></returns>
		public short GetColspan() { return colspan; }

		/// <summary>
		/// Get number of rowspan
		/// </summary>
		/// <returns></returns>
		public short GetRowspan() { return rowspan; }
		#endregion // Rowspan & Colspan

		#region Location & Size

		[NonSerialized]
		private Rectangle bounds;

		internal Rectangle Bounds
		{
			get { return bounds; }
			set { bounds = value; }
		}

		internal RGFloat Width
		{
			get { return bounds.Width; }
			set { bounds.Width = value; }
		}

		internal RGFloat Height
		{
			get { return bounds.Height; }
			set { bounds.Height = value; }
		}

		internal RGFloat Top
		{
			get { return bounds.Y; }
			set { bounds.Y = value; }
		}

		internal RGFloat Left
		{
			get { return bounds.X; }
			set { bounds.X = value; }
		}

		internal RGFloat Right
		{
			get { return bounds.Right; }
			set { bounds.Width += bounds.Right - value; }
		}

		internal RGFloat Bottom
		{
			get { return bounds.Bottom; }
			set { bounds.Height += bounds.Bottom - value; }
		}
		#endregion // Location & Size

		#region Data Format

		private CellDataFormatFlag dataFormat;

		/// <summary>
		/// Get or set the data format type
		/// </summary>
		public CellDataFormatFlag DataFormat
		{
			get { return dataFormat; }
			set { dataFormat = value; }
		}

		private object dataFormatArgs;

		/// <summary>
		/// Get or set the argument of data format type
		/// </summary>
		public object DataFormatArgs
		{
			get { return dataFormatArgs; }
			set { dataFormatArgs = value; }
		}

		#endregion // Data Format

		#region Data, Display

		/// <summary>
		/// cell data
		/// </summary>
		internal object InnerData { get; set; }

		/// <summary>
		/// Get or set cell data
		/// </summary>
		public object Data
		{
			get { return InnerData; }
			set
			{
				if (this.worksheet != null)
				{
					// update cell data
					this.worksheet.SetSingleCellData(this, value);
				}
				else
				{
					this.InnerData = value;
				}
			}
		}

		/// <summary>
		/// Get and convert data into specified type
		/// </summary>
		/// <typeparam name="T">Type try to convert</typeparam>
		/// <returns>Converted data in specified type</returns>
		public T GetData<T>()
		{
			return CellUtility.ConvertData<T>(this.InnerData);
		}

		/// <summary>
		/// cell formula
		/// </summary>
		internal string InnerFormula { get; set; }
#if FORMULA

		internal FormulaStatus formulaStatus;

		/// <summary>
		/// Determine the status of formula calculation
		/// </summary>
		public FormulaStatus FormulaStatus
		{
			get { return this.formulaStatus; }
		}
#endif // FORMULA

		/// <summary>
		/// cell display text.
		/// </summary>
		internal string InnerDisplay { get; set; }

		/// <summary>
		/// Get the text displayed in cell. Set <code>Data</code> property to change this text.
		/// </summary>
		public string DisplayText { get { return InnerDisplay; } }

		/// <summary>
		/// Determine whether or not allow to change data of this cell.
		/// </summary>
		public bool IsReadOnly { get; set; }

		/// <summary>
		/// Start edit this cell.
		/// </summary>
		public void StartEdit()
		{
			ValidateAssociation();

			this.worksheet.StartEdit(this);
		}

		/// <summary>
		/// Finish edit this cell.
		/// </summary>
		public void EndEdit()
		{
			ValidateAssociation();

			if (this.worksheet.currentEditingCell == this)
			{
				this.worksheet.EndEdit(this);
			}
		}

		/// <summary>
		/// Expand or shrink row height to fit the display text in this cell.
		/// </summary>
		public void ExpandRowHeight()
		{
			ValidateAssociation();
			this.worksheet.ExpandRowHeightToFitCell(this);
		}

		/// <summary>
		/// Expand or shrink column width to fit the display text in this cell.
		/// </summary>
		public void ExpandColumnWidth()
		{
			ValidateAssociation();
			this.worksheet.ExpandColumnWidthFitToCell(this);
		}

		private void ValidateAssociation()
		{
			if (this.worksheet == null)
			{
				throw new ReferenceObjectNotAssociatedException("Cell not associated to any worksheet.");
			}
		}

		#endregion // Data and Display

		#region Formula
#if FORMULA
		[NonSerialized]
		internal STNode formulaTree;

		internal STNode FormulaTree { get { return this.formulaTree; } set { this.formulaTree = value; } }
#endif

		/// <summary>
		/// Get or set the cell formula
		/// </summary>
		/// <returns>Formula of cell in string</returns>
		public string Formula
		{
			get { return InnerFormula; }
			set
			{
				if (this.InnerFormula != value)
				{
					if (this.Worksheet == null)
					{
						this.InnerFormula = value;
						this.InnerData = null;
						this.InnerDisplay = null;
#if DEBUG
						Logger.Log("cell", "Cell not attached to any worksheet: {0}", this.Position.ToAddress());
#endif
					}
					else
					{

#if FORMULA
						if (string.IsNullOrEmpty(value))
						{
							this.worksheet.DeleteCellFormula(this);
						}
						else
						{
							this.worksheet.SetCellFormula(this, value);
							this.worksheet.RecalcCell(this);
						}
#else
						this.worksheet.SetSingleCellData(this, value);
#endif
					}
				}
			}
		}

		/// <summary>
		/// Identify whether or not this cell contains the formula and the value has been evaluated
		/// </summary>
		public bool HasFormula { get { return !string.IsNullOrEmpty(InnerFormula); } }

		#endregion // Formula

		#region Style

		internal WorksheetRangeStyle InnerStyle { get; set; }

		internal StyleParentKind StyleParentKind { get; set; }

#if DEBUG
		private static int _count;
#endif

		internal void CreateOwnStyle()
		{
			this.InnerStyle = new WorksheetRangeStyle(this.InnerStyle);

			this.StyleParentKind = StyleParentKind.Own;

#if DEBUG
			if ((++_count % 50) == 0)
			{
				unvell.Common.Logger.Log("style", "new style created, count: " + _count);
			}
#endif
		}

		[NonSerialized]
		private ReferenceCellStyle referenceStyle;

		/// <summary>
		/// Get or set style object of cell.
		/// </summary>
		public ReferenceCellStyle Style
		{
			get
			{
				if (this.referenceStyle == null)
				{
					this.referenceStyle = new ReferenceCellStyle(this);
				}

				return this.referenceStyle;
			}
			set
			{
				if (value == null)
				{
					this.Worksheet.RemoveRangeStyles(new RangePosition(this.InternalPos, this.InternalPos), PlainStyleFlag.All);
				}
				else
				{
					var anotherCell = value.Cell;
					if (anotherCell == null) return;

					var anotherStyle = anotherCell.InnerStyle;

					switch (anotherCell.StyleParentKind)
					{
						case StyleParentKind.Col:
						case StyleParentKind.Row:
						case StyleParentKind.Root:
						case StyleParentKind.Range:
							this.InnerStyle = anotherCell.InnerStyle;
							this.StyleParentKind = anotherCell.StyleParentKind;
							break;

						default:
						case StyleParentKind.Own:
							this.InnerStyle = new WorksheetRangeStyle(anotherCell.InnerStyle);
							this.StyleParentKind = StyleParentKind.Own;
							break;
					}
				}
			}
		}

		/// <summary>
		/// Checks whether or not this cell is visible. (Cells on hidden rows or columns will become invisibility)
		/// </summary>
		public bool IsVisible
		{
			get
			{
				if (this.Worksheet == null) return false;

				return this.Worksheet.IsCellVisible(this);
			}
		}

		/// <summary>
		/// Determines whether or not this cell is visible. (Cells on hidden rows or columns will become invisibility)
		/// </summary>
		[Obsolete("use !IsVisible instead")]
		public bool IsHidden
		{
			get
			{
				return !this.IsVisible;
			}
		}

		// todo: support multi-lines
		private RGFloat distributedIndentSpacing;
		internal RGFloat DistributedIndentSpacing { get { return distributedIndentSpacing; } set { distributedIndentSpacing = value; } }
		private RGFloat distributedIndentSpacingPrint;
		internal RGFloat DistributedIndentSpacingPrint { get { return distributedIndentSpacingPrint; } set { distributedIndentSpacingPrint = value; } }

		#endregion // Style

		#region Border Wraps
		private CellBorderProperty borderProperty = null;

		/// <summary>
		/// Get border property from cell.
		/// </summary>
		public CellBorderProperty Border
		{
			get
			{
				if (borderProperty == null)
				{
					borderProperty = new CellBorderProperty(this);
				}

				return borderProperty;
			}
		}
		#endregion // Border Wraps

		#region Cell Body
		internal void UpdateContentBounds()
		{
			if (this.body != null)
			{
				Rectangle cb = new Rectangle(this.InnerStyle.Padding.Left, this.InnerStyle.Padding.Top,
					bounds.Width - 1 - this.InnerStyle.Padding.Left - this.InnerStyle.Padding.Right,
					bounds.Height - 1 - this.InnerStyle.Padding.Top - this.InnerStyle.Padding.Bottom);

				if (this.body.Bounds != cb)
				{
					this.body.Bounds = cb;
					this.body.OnBoundsChanged();
				}
			}
		}

		/// <summary>
		/// Get or set the user data attaching to this cell.
		/// </summary>
		public object Tag { get; set; }

		internal ICellBody body;

		/// <summary>
		/// Get or set the cell body.
		/// </summary>
		public ICellBody Body
		{
			get { return body; }
			set
			{
				if (this.body != value)
				{
					this.body = value;

					if (this.body != null)
					{
						this.body.OnSetup(this);

						if (this.body is CellBody)
						{
							((CellBody)this.body).InnerCell = this;
						}
					}

					UpdateContentBounds();

					if (this.Worksheet != null) this.Worksheet.RequestInvalidate();
				}
			}
		}
		#endregion

		#region Utility
		/// <summary>
		/// Clone this cell instance by copying its all of properties
		/// </summary>
		/// <returns>new cell instance copied from this cell</returns>
		public Cell Clone()
		{
			var cell = new Cell(this.Worksheet);
			CellUtility.CopyCell(cell, this);
			return cell;
		}

		public override string ToString()
		{
			return "Cell[" + this.Address + "]";
		}
		#endregion // Utility
	}

	#endregion

	#region CellElementFlag
	/// <summary>
	/// Cell element flags
	/// </summary>
	[Flags]
	public enum CellElementFlag
	{
		/// <summary>
		/// All elements
		/// </summary>
		All = Data | Formula | DataFormat | Style | Border | Body,

		/// <summary>
		/// Cell value
		/// </summary>
		Data = 0x1,

		/// <summary>
		/// Cell formuals
		/// </summary>
		Formula = 0x2,

		/// <summary>
		/// Cell body
		/// </summary>
		Body = 0x4,

		/// <summary>
		/// Data format setting
		/// </summary>
		DataFormat = 0x8,

		/// <summary>
		/// Styles
		/// </summary>
		Style = 0x10,

		/// <summary>
		/// Border around the cell
		/// </summary>
		Border = 0x20,

	}
	#endregion // CellElementFlag
}

namespace unvell.ReoGrid.Utility
{
	#region Cell Utility
	/// <summary>
	/// Common utility functions for cell.
	/// </summary>
	public static class CellUtility
	{
		/// <summary>
		/// Clone new cell instance from another cell.
		/// </summary>
		/// <param name="toCell">Target cell to be copied into.</param>
		/// <param name="fromCell">Original cell to be copied from.</param>
		/// <returns>Instance of cell cloned</returns>
		public static void CopyCell(Cell toCell, Cell fromCell)
		{
			// base
			toCell.InternalPos = fromCell.InternalPos;
			toCell.Rowspan = fromCell.Rowspan;
			toCell.Colspan = fromCell.Colspan;
			toCell.MergeStartPos = fromCell.MergeStartPos;
			toCell.MergeEndPos = fromCell.MergeEndPos;
			toCell.Bounds = fromCell.Bounds;

			// content
			CopyCellContent(toCell, fromCell);
		}

		/// <summary>
		/// Copy all content from a cell to another cell.
		/// </summary>
		/// <param name="toCell">Target cell to be copied into.</param>
		/// <param name="fromCell">Source cell to be copied from.</param>
		public static void CopyCellContent(Cell toCell, Cell fromCell)
		{
			// style & render
			toCell.InnerStyle = new WorksheetRangeStyle(fromCell.InnerStyle);
			toCell.StyleParentKind = fromCell.StyleParentKind;
			toCell.TextBounds = fromCell.TextBounds;
			toCell.RenderHorAlign = fromCell.RenderHorAlign;
			toCell.RenderColor = fromCell.RenderColor;
			toCell.DistributedIndentSpacing = fromCell.DistributedIndentSpacing;

#if WINFORM
			toCell.RenderFont = fromCell.RenderFont;
#endif // WINFORM

			// data format
			toCell.DataFormat = fromCell.DataFormat;
			toCell.DataFormatArgs = fromCell.DataFormatArgs;
			toCell.Body = fromCell.body == null ? null : fromCell.body.Clone();

			// cell data
			toCell.InnerData = fromCell.InnerData;
			toCell.InnerDisplay = fromCell.DisplayText;

#if FORMULA
			toCell.Formula = fromCell.Formula;

			if (fromCell.formulaTree != null)
			{
				toCell.formulaTree = (STNode)fromCell.formulaTree.Clone();
			}

			// do not copy formula status since SetPartialGrid method will rebuilt formula status.
			//toCell.formulaStatus = fromCell.formulaStatus;
#endif // FORMULA

			// properties
			toCell.FontDirty = fromCell.FontDirty;
			toCell.IsReadOnly = fromCell.IsReadOnly;

			// custom content
			toCell.Tag = fromCell.Tag;
		}

		/// <summary>
		/// Check specified data from a cell is whether or not a number.
		/// </summary>
		/// <param name="cell">Cell instance of data.</param>
		/// <returns>True if data from the cell is number.</returns>
		public static bool IsNumberData(Cell cell)
		{
			var data = cell.InnerData;
			return data is double || data is int || data is float || data is long || data is byte || data is decimal;
		}

		/// <summary>
		/// Check specified data is whether or not a number.
		/// </summary>
		/// <param name="data">Data to be check.</param>
		/// <returns>True if data is number.</returns>
		public static bool IsNumberData(object data)
		{
			return data is double || data is int || data is float || data is long || data is byte || data is decimal;
		}

		/// <summary>
		/// Try get double value from specified cell.
		/// </summary>
		/// <param name="cell">Instance of cell.</param>
		/// <param name="value">The output value converted from data.</param>
		/// <returns>True if convert is succesful.</returns>
		public static bool TryGetNumberData(Cell cell, out double value)
		{
			return TryGetNumberData(cell.InnerData, out value);
		}

		/// <summary>
		/// Try get double value from specified object.
		/// </summary>
		/// <param name="data">Data to be check and converted.</param>
		/// <param name="value">The output value converted from data.</param>
		/// <returns>True if convert is succesful.</returns>
		public static bool TryGetNumberData(object data, out double value)
		{
			if (data is double)
			{
				value = (double)data;
				return true;
			}
			else if (data is int || data is long || data is float || data is byte || data is decimal)
			{
				value = (double)Convert.ChangeType(data, typeof(double));
				return true;
			}
			else if (data is string)
			{
				return double.TryParse((string)data, out value);
			}
			else
			{
				value = 0;
				return false;
			}
		}

		#region ConvertCellData
		/// <summary>
		/// Convert cell data into another type if possible.
		/// </summary>
		/// <param name="data">Cell data to be converted.</param>
		/// <returns>Output object after convert.</returns>
		public static T ConvertData<T>(object data)
		{
			T value;
			ConvertData(data, out value);
			return value;
		}

		/// <summary>
		/// Convert cell data into another type if possible.
		/// </summary>
		/// <typeparam name="T">Type after convert.</typeparam>
		/// <param name="data">Cell data to be converted.</param>
		/// <param name="value">Output object after convert.</param>
		/// <returns>True if convert is successful.</returns>
		public static bool ConvertData<T>(object data, out T value)
		{
			if (data == null)
			{
				value = default(T);
				return false;
			}

			var targetType = typeof(T);

			if (data is string)
			{
				if (targetType == typeof(string))
				{
					value = (T)data;
					return true;
				}

				double tmpVal;
				if (!double.TryParse((string)data, out tmpVal))
				{
					value = default(T);
					return false;
				}
				data = tmpVal;
			}
			else if (data is StringBuilder)
			{
				if (targetType == typeof(StringBuilder))
				{
					value = (T)data;
					return true;
				}

				double tmpVal;
				if (!double.TryParse(((StringBuilder)data).ToString(), out tmpVal))
				{
					value = default(T);
					return false;
				}
				data = tmpVal;
			}

			// require string, but data is not in string, return false
			if (targetType != typeof(string) && (data is string || data is StringBuilder))
			{
				value = default(T);
				return false;
			}
			else if (targetType == typeof(double))
			{
				if (data is char)
				{
					data = (int)(char)data;
				}
			}

			value = (T)Convert.ChangeType(data, typeof(T));
			return true;
		}
		#endregion // ConvertCellData

	}
	#endregion // Cell Utility
}