using System;
using System.ComponentModel;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Windows.Forms;
using System.Windows.Forms.Design;
using Microsoft.Win32;

namespace Unclassified.UI
{
	/// <seealso cref="http://beta.unclassified.de/code/dotnet/infolabel/"/>
	[Designer(typeof(InfoLabelDesigner))]
	[DefaultEvent("Click")]
	public class InfoLabel : UserControl
	{
		#region Private fields
		private bool useBorder = false;
		private Color borderColor;
		private Pen borderColorPen;
		private Brush backColorBrush;
		private Color hoverBackColor;
		private Color hoverBorderColor;
		private Pen hoverBorderColorPen;
		private Brush hoverBackColorBrush;
		private Color hoverForeColor;
		private Brush hoverForeColorBrush;
		private bool hovering = false;
		private bool supportHovering = false;
		private ContextMenu contextMenu = null;
		private ContextMenuStrip contextMenuStrip = null;
		#endregion Private fields

		#region Constructors
		public InfoLabel()
		{
			InitializeComponent();

			BackColor = SystemColors.Info;
			ForeColor = SystemColors.InfoText;
			BorderColor = SystemColors.ControlDark;

			HoverBackColor = SystemColors.Highlight;
			HoverForeColor = SystemColors.HighlightText;
			HoverBorderColor = SystemColors.ControlDark;
		}
		#endregion Constructors

		#region Designer stuff
		private System.Windows.Forms.FlowLayoutPanel flowLayoutPanel1;
		private System.Windows.Forms.PictureBox pictureBox1;
		private System.Windows.Forms.Label label1;
		private System.ComponentModel.IContainer components = null;

		protected override void Dispose(bool disposing)
		{
			if (disposing && (components != null))
			{
				components.Dispose();
			}
			base.Dispose(disposing);
		}

		private void InitializeComponent()
		{
			this.flowLayoutPanel1 = new System.Windows.Forms.FlowLayoutPanel();
			this.pictureBox1 = new System.Windows.Forms.PictureBox();
			this.label1 = new System.Windows.Forms.Label();
			this.flowLayoutPanel1.SuspendLayout();
			((System.ComponentModel.ISupportInitialize) (this.pictureBox1)).BeginInit();
			this.SuspendLayout();
			//
			// flowLayoutPanel1
			//
			this.flowLayoutPanel1.AutoSize = true;
			this.flowLayoutPanel1.AutoSizeMode = System.Windows.Forms.AutoSizeMode.GrowAndShrink;
			this.flowLayoutPanel1.BackColor = System.Drawing.Color.Transparent;
			this.flowLayoutPanel1.Controls.Add(this.pictureBox1);
			this.flowLayoutPanel1.Controls.Add(this.label1);
			this.flowLayoutPanel1.Dock = System.Windows.Forms.DockStyle.Top;
			this.flowLayoutPanel1.FlowDirection = System.Windows.Forms.FlowDirection.TopDown;
			this.flowLayoutPanel1.Location = new System.Drawing.Point(0, 0);
			this.flowLayoutPanel1.Name = "flowLayoutPanel1";
			this.flowLayoutPanel1.Padding = new System.Windows.Forms.Padding(3);
			this.flowLayoutPanel1.Size = new System.Drawing.Size(279, 34);
			this.flowLayoutPanel1.TabIndex = 0;
			this.flowLayoutPanel1.MouseLeave += new System.EventHandler(this.flowLayoutPanel1_MouseLeave);
			this.flowLayoutPanel1.Click += new System.EventHandler(this.flowLayoutPanel1_Click);
			this.flowLayoutPanel1.Resize += new System.EventHandler(this.flowLayoutPanel1_Resize);
			this.flowLayoutPanel1.MouseEnter += new System.EventHandler(this.flowLayoutPanel1_MouseEnter);
			//
			// pictureBox1
			//
			this.pictureBox1.BackColor = System.Drawing.Color.Transparent;
			this.flowLayoutPanel1.SetFlowBreak(this.pictureBox1, true);
			this.pictureBox1.Location = new System.Drawing.Point(3, 3);
			this.pictureBox1.Margin = new System.Windows.Forms.Padding(1, 0, 2, 0);
			this.pictureBox1.Name = "pictureBox1";
			this.pictureBox1.Size = new System.Drawing.Size(16, 16);
			this.pictureBox1.SizeMode = System.Windows.Forms.PictureBoxSizeMode.AutoSize;
			this.pictureBox1.TabIndex = 0;
			this.pictureBox1.TabStop = false;
			this.pictureBox1.Visible = false;
			this.pictureBox1.MouseLeave += new System.EventHandler(this.flowLayoutPanel1_MouseLeave);
			this.pictureBox1.Click += new System.EventHandler(this.flowLayoutPanel1_Click);
			this.pictureBox1.MouseEnter += new System.EventHandler(this.flowLayoutPanel1_MouseEnter);
			//
			// label1
			//
			this.label1.AutoSize = true;
			this.label1.BackColor = System.Drawing.Color.Transparent;
			this.label1.Location = new System.Drawing.Point(23, 4);
			this.label1.Margin = new System.Windows.Forms.Padding(0, 1, 0, 1);
			this.label1.Name = "label1";
			this.label1.Size = new System.Drawing.Size(247, 26);
			this.label1.TabIndex = 1;
			this.label1.Text = "label1";
			this.label1.UseMnemonic = false;
			this.label1.MouseLeave += new System.EventHandler(this.flowLayoutPanel1_MouseLeave);
			this.label1.Click += new System.EventHandler(this.flowLayoutPanel1_Click);
			this.label1.MouseEnter += new System.EventHandler(this.flowLayoutPanel1_MouseEnter);
			//
			// InfoLabel
			//
			this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
			this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
			this.Controls.Add(this.flowLayoutPanel1);
			this.DoubleBuffered = true;
			this.Name = "InfoLabel";
			this.Size = new System.Drawing.Size(279, 80);
			this.Enter += new System.EventHandler(this.InfoLabel_Enter);
			this.Leave += new System.EventHandler(this.InfoLabel_Leave);
			this.KeyDown += new System.Windows.Forms.KeyEventHandler(this.InfoLabel_KeyDown);
			this.flowLayoutPanel1.ResumeLayout(false);
			this.flowLayoutPanel1.PerformLayout();
			((System.ComponentModel.ISupportInitialize) (this.pictureBox1)).EndInit();
			this.ResumeLayout(false);
			this.PerformLayout();

		}
		#endregion Designer stuff

		#region Old properties
		public override Color BackColor
		{
			get
			{
				return base.BackColor;
			}
			set
			{
				base.BackColor = value;
				backColorBrush = new SolidBrush(value);
			}
		}

		[Browsable(false)]
		public override Image BackgroundImage
		{
			get
			{
				return base.BackgroundImage;
			}
			set
			{
				base.BackgroundImage = null;
			}
		}

		[Browsable(false)]
		public override ImageLayout BackgroundImageLayout
		{
			get
			{
				return base.BackgroundImageLayout;
			}
			set
			{
				base.BackgroundImageLayout = ImageLayout.None;
			}
		}

		[Browsable(false)]
		public new BorderStyle BorderStyle
		{
			get
			{
				return BorderStyle.None;
			}
		}

		public override AnchorStyles Anchor
		{
			get
			{
				return base.Anchor;
			}
			set
			{
				if ((value & AnchorStyles.Top) != 0 && (value & AnchorStyles.Bottom) != 0)
					throw new ArgumentException();

				base.Anchor = value;
			}
		}

		[Browsable(false)]
		public override bool AutoScroll
		{
			get
			{
				return base.AutoScroll;
			}
			set
			{
				base.AutoScroll = false;
			}
		}

		[Browsable(false)]
		public override bool AutoSize
		{
			get
			{
				return base.AutoSize;
			}
			set
			{
				base.AutoSize = false;
			}
		}

		public override DockStyle Dock
		{
			get
			{
				return base.Dock;
			}
			set
			{
				if (value == DockStyle.Fill || value == DockStyle.Left || value == DockStyle.Right)
					throw new ArgumentException();

				base.Dock = value;
			}
		}

		// This must be named different from "Text" because the designer won't
		// store that property persistently and reset it every time the project
		// is rebuilt.
		//[Category("Appearance")]
		//[Browsable(false)]
		//public string Text2
		//{
		//    get
		//    {
		//        return label1.Text;
		//    }
		//    set
		//    {
		//        label1.Text = value;
		//    }
		//}

		[Browsable(true)]
		[DesignerSerializationVisibility(DesignerSerializationVisibility.Visible)]
		public override string Text
		{
			get
			{
				return label1.Text;
			}
			set
			{
				label1.Text = value;
			}
		}

		public override ContextMenu ContextMenu
		{
			get
			{
				return contextMenu;
			}
			set
			{
				contextMenu = value;
			}
		}

		public override ContextMenuStrip ContextMenuStrip
		{
			get
			{
				return contextMenuStrip;
			}
			set
			{
				contextMenuStrip = value;
			}
		}
		#endregion Old properties

		#region New properties
		[Category("Appearance")]
		public Color BorderColor
		{
			get
			{
				return borderColor;
			}
			set
			{
				borderColor = value;
				borderColorPen = new Pen(borderColor);
				Invalidate();
			}
		}

		[Category("Appearance")]
		public Color HoverBorderColor
		{
			get
			{
				return hoverBorderColor;
			}
			set
			{
				hoverBorderColor = value;
				hoverBorderColorPen = new Pen(hoverBorderColor);
				Invalidate();
			}
		}

		[Category("Appearance")]
		public bool UseBorder
		{
			get
			{
				return useBorder;
			}
			set
			{
				useBorder = value;
				flowLayoutPanel1.Padding = new Padding(useBorder ? 3 : 2);
				Invalidate();
			}
		}

		[Category("Appearance")]
		public Color HoverBackColor
		{
			get
			{
				return hoverBackColor;
			}
			set
			{
				hoverBackColor = value;
				hoverBackColorBrush = new SolidBrush(value);
				Invalidate();
			}
		}

		[Category("Appearance")]
		public Color HoverForeColor
		{
			get
			{
				return hoverForeColor;
			}
			set
			{
				hoverForeColor = value;
				hoverForeColorBrush = new SolidBrush(value);
				Invalidate();
			}
		}

		[Category("Appearance")]
		public Image IconImage
		{
			get
			{
				return pictureBox1.Image;
			}
			set
			{
				pictureBox1.Image = value;
				pictureBox1.Visible = value != null;
			}
		}

		[Category("Behavior")]
		public bool SupportHovering
		{
			get
			{
				return supportHovering;
			}
			set
			{
				supportHovering = value;
				UpdateHovering();
				Invalidate();
			}
		}
		#endregion New properties

		#region New event handlers
		protected override void OnSizeChanged(EventArgs e)
		{
			Invalidate();
			base.OnSizeChanged(e);
		}

		private void flowLayoutPanel1_Resize(object sender, EventArgs e)
		{
			UpdateSize();
		}

		private void flowLayoutPanel1_MouseEnter(object sender, EventArgs e)
		{
			hovering = true;
			UpdateHovering();
			Invalidate();
		}

		private void flowLayoutPanel1_MouseLeave(object sender, EventArgs e)
		{
			hovering = false;
			UpdateHovering();
			Invalidate();
		}

		protected override void OnPaintBackground(PaintEventArgs e)
		{
			base.OnPaintBackground(e);

			if (useBorder)
			{
				if (supportHovering && hovering)
				{
					e.Graphics.FillRectangle(hoverBackColorBrush, 1, 1, Width - 2, Height - 2);
					e.Graphics.DrawRectangle(hoverBorderColorPen, 0, 0, Width - 1, Height - 1);
				}
				else
				{
					//e.Graphics.FillRectangle(backColorBrush, 1, 1, Width - 2, Height - 2);
					e.Graphics.DrawRectangle(borderColorPen, 0, 0, Width - 1, Height - 1);
				}
			}
			else
			{
				if (supportHovering && hovering)
				{
					e.Graphics.FillRectangle(hoverBackColorBrush, 0, 0, Width, Height);
				}
				else
				{
					//e.Graphics.FillRectangle(backColorBrush, 0, 0, Width, Height);
				}
			}
		}

		protected override void OnPaint(PaintEventArgs e)
		{
			base.OnPaint(e);

			if (Focused || FindForm() != null && FindForm().ActiveControl == this)   // Focused alone doesn't work when re-activating the window
			{
				e.Graphics.DrawRectangle(new Pen(new HatchBrush(HatchStyle.Percent50, label1.ForeColor, Color.Empty)), 0, 0, Width - 1, Height - 1);
			}
		}
		#endregion New event handlers

		#region Other private methods
		private void UpdateSize()
		{
			int oldHeight = Height;
			Height = flowLayoutPanel1.Height;
			if (Height != oldHeight)
				Invalidate();
		}

		private void UpdateHovering()
		{
			if (supportHovering && hovering)
			{
				label1.ForeColor = HoverForeColor;
				Cursor = HandCursor;
			}
			else
			{
				label1.ForeColor = Color.Empty;
				Cursor = Cursors.Default;
			}
		}
		#endregion Other private methods

		#region Public events
		public new event EventHandler Click;

		private void flowLayoutPanel1_Click(object sender, EventArgs e)
		{
			if (ContextMenu != null)
			{
				ContextMenu.Show(this, new Point(0, Height - (useBorder ? 1 : 0)));
			}
			else if (ContextMenuStrip != null)
			{
				ContextMenuStrip.Show(this, new Point(0, Height - (useBorder ? 1 : 0)));
			}
			else
			{
				if (Click != null) Click(this, EventArgs.Empty);
			}
		}

		private void InfoLabel_Enter(object sender, EventArgs e)
		{
			Invalidate();
		}

		private void InfoLabel_Leave(object sender, EventArgs e)
		{
			Invalidate();
		}

		private void InfoLabel_KeyDown(object sender, KeyEventArgs e)
		{
			if ((e.KeyCode == Keys.Enter || e.KeyCode == Keys.Space) && !e.Alt && !e.Control && !e.Shift)
			{
				flowLayoutPanel1_Click(this, EventArgs.Empty);
				e.Handled = true;
				e.SuppressKeyPress = true;
			}
		}
		#endregion Public events

		#region WinAPI stuff
		// This comes from class Unclassified.WinApi

		[DllImport("user32.dll", SetLastError = true, CharSet = CharSet.Auto)]
		private static extern IntPtr LoadCursorFromFile(string path);

		/// <summary>
		/// Gets the system's hand mouse cursor, used for hyperlinks.
		/// The .NET framework only gives its internal cursor but not the one that the user has set in their profile.
		/// </summary>
		private Cursor HandCursor
		{
			get
			{
				RegistryKey cursorsKey = Registry.CurrentUser.OpenSubKey(@"Control Panel\Cursors");
				if (cursorsKey != null)
				{
					object o = cursorsKey.GetValue("Hand");
					if (o is string)
					{
						IntPtr cursorHandle = WinApi.LoadCursorFromFile((string) o);
						return new Cursor(cursorHandle);
					}
				}
				return Cursors.Hand;
				}
			}
		}
		#endregion WinAPI stuff
	}

	public class InfoLabelDesigner : ControlDesigner
	{
		public override SelectionRules SelectionRules
		{
			get
			{
				return base.SelectionRules & ~(SelectionRules.TopSizeable | SelectionRules.BottomSizeable);
			}
		}
	}
}