using System;

using System.Drawing;

using System.Diagnostics;

using System.Drawing.Drawing2D;

using System.Windows.Forms;

using Aga.Controls.Tree.NodeControls;

namespace Aga.Controls.Tree

{

	public partial class TreeViewAdv

	{

		public void AutoSizeColumn(TreeColumn column)

		{

			if (!Columns.Contains(column))

				throw new ArgumentException("column");

			DrawContext context = new DrawContext();

			context.Graphics = Graphics.FromImage(new Bitmap(1, 1));

			context.Font = this.Font;

			int res = 0;

			for (int row = 0; row < RowCount; row++)

			{

				if (row < RowMap.Count)

				{

					int w = 0;

					TreeNodeAdv node = RowMap[row];

					foreach (NodeControl nc in NodeControls)

					{

						if (nc.ParentColumn == column)

							w += nc.GetActualSize(node, _measureContext).Width;

					}

					res = Math.Max(res, w);

				}

			}

			if (res > 0)

				column.Width = res;

		}

		private void CreatePens()

		{

			CreateLinePen();

			CreateMarkPen();

		}

		private void CreateMarkPen()

		{

			GraphicsPath path = new GraphicsPath();

			path.AddLines(new Point[] { new Point(0, 0), new Point(1, 1), new Point(-1, 1), new Point(0, 0) });

			CustomLineCap cap = new CustomLineCap(null, path);

			cap.WidthScale = 1.0f;

			_markPen = new Pen(_dragDropMarkColor, _dragDropMarkWidth);

			_markPen.CustomStartCap = cap;

			_markPen.CustomEndCap = cap;

		}

		private void CreateLinePen()

		{

			_linePen = new Pen(_lineColor);

			_linePen.DashStyle = DashStyle.Dot;

		}

        protected override void OnPaint(PaintEventArgs e)

        {

            BeginPerformanceCount();

			PerformanceAnalyzer.Start("OnPaint");

            DrawContext context = new DrawContext();

            context.Graphics = e.Graphics;

            context.Font = this.Font;

            context.Enabled = Enabled;

            int y = 0;

            int gridHeight = 0;

            if (UseColumns)

            {

				DrawColumnHeaders(e.Graphics);

				y += ColumnHeaderHeight;

                if (Columns.Count == 0 || e.ClipRectangle.Height <= y)

                    return;

            }

			int firstRowY = _rowLayout.GetRowBounds(FirstVisibleRow).Y;

            y -= firstRowY;

            e.Graphics.ResetTransform();

            e.Graphics.TranslateTransform(-OffsetX, y);

            Rectangle displayRect = DisplayRectangle;

            for (int row = FirstVisibleRow; row < RowCount; row++)

            {

                Rectangle rowRect = _rowLayout.GetRowBounds(row);

                gridHeight += rowRect.Height;

                if (rowRect.Y + y > displayRect.Bottom)

                    break;

                else

                    DrawRow(e, ref context, row, rowRect);

            }

			if ((GridLineStyle & GridLineStyle.Vertical) == GridLineStyle.Vertical && UseColumns)

				DrawVerticalGridLines(e.Graphics, firstRowY);

			if (_dropPosition.Node != null && DragMode && HighlightDropPosition)

                DrawDropMark(e.Graphics);

            e.Graphics.ResetTransform();

            DrawScrollBarsBox(e.Graphics);

            if (DragMode && _dragBitmap != null)

                e.Graphics.DrawImage(_dragBitmap, PointToClient(MousePosition));

			PerformanceAnalyzer.Finish("OnPaint");

			EndPerformanceCount(e);

        }

		private void DrawRow(PaintEventArgs e, ref DrawContext context, int row, Rectangle rowRect)

		{

			TreeNodeAdv node = RowMap[row];

			context.DrawSelection = DrawSelectionMode.None;

			context.CurrentEditorOwner = CurrentEditorOwner;

			if (DragMode)

			{

				if ((_dropPosition.Node == node) && _dropPosition.Position == NodePosition.Inside && HighlightDropPosition)

					context.DrawSelection = DrawSelectionMode.Active;

			}

			else

			{

				if (node.IsSelected && Focused)

					context.DrawSelection = DrawSelectionMode.Active;

				else if (node.IsSelected && !Focused && !HideSelection)

					context.DrawSelection = DrawSelectionMode.Inactive;

			}

			context.DrawFocus = Focused && CurrentNode == node;

			OnRowDraw(e, node, context, row, rowRect);

			if ((GridLineStyle & GridLineStyle.Horizontal) == GridLineStyle.Horizontal) {

				e.Graphics.DrawLine(LightGrayPen, 0, rowRect.Bottom, e.Graphics.ClipBounds.Right, rowRect.Bottom);

      }

			if (FullRowSelect)

			{

				context.DrawFocus = false;

				if (context.DrawSelection == DrawSelectionMode.Active || context.DrawSelection == DrawSelectionMode.Inactive)

				{

					Rectangle focusRect = new Rectangle(OffsetX, rowRect.Y, ClientRectangle.Width, rowRect.Height);

					if (context.DrawSelection == DrawSelectionMode.Active)

					{

						e.Graphics.FillRectangle(GrayBrush, focusRect);

						context.DrawSelection = DrawSelectionMode.FullRowSelect;

					}

					else

					{

						e.Graphics.FillRectangle(GrayBrush, focusRect);

						context.DrawSelection = DrawSelectionMode.None;

					}

				}

			}

			if (ShowLines)

				DrawLines(e.Graphics, node, rowRect);

			DrawNode(node, context);

		}

		private Brush GrayBrush = new SolidBrush(Color.FromArgb(240, 240, 240));

		private Pen LightGrayPen = new Pen(Color.FromArgb(247, 247, 247));

		private void DrawVerticalGridLines(Graphics gr, int y)

		{

			int x = 0;

			foreach (TreeColumn c in Columns)

			{

				if (c.IsVisible)

				{

					x += c.Width;

					gr.DrawLine(SystemPens.InactiveBorder, x - 1, y, x - 1, gr.ClipBounds.Bottom);

				}

			}

		}

		private void DrawColumnHeaders(Graphics gr)

		{

			PerformanceAnalyzer.Start("DrawColumnHeaders");

			ReorderColumnState reorder = Input as ReorderColumnState;

			int x = 0;

			TreeColumn.DrawBackground(gr, new Rectangle(0, 0, ClientRectangle.Width + 2, ColumnHeaderHeight - 1), false, false);

			gr.TranslateTransform(-OffsetX, 0);

			foreach (TreeColumn c in Columns)

			{

				if (c.IsVisible)

				{

					if (x >= OffsetX && x - OffsetX < this.Bounds.Width)// skip invisible columns

					{

						Rectangle rect = new Rectangle(x, 0, c.Width, ColumnHeaderHeight - 1);

						gr.SetClip(rect);

						bool pressed = ((Input is ClickColumnState || reorder != null) && ((Input as ColumnState).Column == c));

						c.Draw(gr, rect, Font, pressed, _hotColumn == c);

						gr.ResetClip();

						if (reorder != null && reorder.DropColumn == c)

							TreeColumn.DrawDropMark(gr, rect);

					}

					x += c.Width;

				}

			}

			if (reorder != null)

			{

				if (reorder.DropColumn == null)

					TreeColumn.DrawDropMark(gr, new Rectangle(x, 0, 0, ColumnHeaderHeight));

				gr.DrawImage(reorder.GhostImage, new Point(reorder.Location.X +  + reorder.DragOffset, reorder.Location.Y));

			}

			PerformanceAnalyzer.Finish("DrawColumnHeaders");

		}

		public void DrawNode(TreeNodeAdv node, DrawContext context)

		{

			foreach (NodeControlInfo item in GetNodeControls(node))

			{

				if (item.Bounds.Right >= OffsetX && item.Bounds.X - OffsetX < this.Bounds.Width)// skip invisible nodes

				{

					context.Bounds = item.Bounds;

					context.Graphics.SetClip(context.Bounds);

					item.Control.Draw(node, context);

					context.Graphics.ResetClip();

				}

			}

		}

		private void DrawScrollBarsBox(Graphics gr)

		{

			Rectangle r1 = DisplayRectangle;

			Rectangle r2 = ClientRectangle;

			gr.FillRectangle(SystemBrushes.Control,

				new Rectangle(r1.Right, r1.Bottom, r2.Width - r1.Width, r2.Height - r1.Height));

		}

		private void DrawDropMark(Graphics gr)

		{

			if (_dropPosition.Position == NodePosition.Inside)

				return;

			Rectangle rect = GetNodeBounds(_dropPosition.Node);

			int right = DisplayRectangle.Right - LeftMargin + OffsetX;

			int y = rect.Y;

			if (_dropPosition.Position == NodePosition.After)

				y = rect.Bottom;

			gr.DrawLine(_markPen, rect.X, y, right, y);

		}

		private void DrawLines(Graphics gr, TreeNodeAdv node, Rectangle rowRect)

		{

			if (UseColumns && Columns.Count > 0)

				gr.SetClip(new Rectangle(0, rowRect.Y, Columns[0].Width, rowRect.Bottom));

			TreeNodeAdv curNode = node;

			while (curNode != _root && curNode != null)

			{

				int level = curNode.Level;

				int x = (level - 1) * _indent + NodePlusMinus.ImageSize / 2 + LeftMargin;

				int width = NodePlusMinus.Width - NodePlusMinus.ImageSize / 2;

				int y = rowRect.Y;

				int y2 = y + rowRect.Height;

				if (curNode == node)

				{

					int midy = y + rowRect.Height / 2;

					gr.DrawLine(_linePen, x, midy, x + width, midy);

					if (curNode.NextNode == null)

						y2 = y + rowRect.Height / 2;

				}

				if (node.Row == 0)

					y = rowRect.Height / 2;

				if (curNode.NextNode != null || curNode == node)

					gr.DrawLine(_linePen, x, y, x, y2);

				curNode = curNode.Parent;

			}

			gr.ResetClip();

		}

		#region Performance

		private double _totalTime;

		private int _paintCount;

		[Conditional("PERF_TEST")]

		private void BeginPerformanceCount()

		{

			_paintCount++;

			TimeCounter.Start();

		}

		[Conditional("PERF_TEST")]

		private void EndPerformanceCount(PaintEventArgs e)

		{

			double time = TimeCounter.Finish();

			_totalTime += time;

			string debugText = string.Format("FPS {0:0.0}; Avg. FPS {1:0.0}",

				1 / time, 1 / (_totalTime / _paintCount));

			e.Graphics.FillRectangle(Brushes.White, new Rectangle(DisplayRectangle.Width - 150, DisplayRectangle.Height - 20, 150, 20));

			e.Graphics.DrawString(debugText, Control.DefaultFont, Brushes.Gray,

				new PointF(DisplayRectangle.Width - 150, DisplayRectangle.Height - 20));

		}

		#endregion

	}

}