using System;
using System.Collections.Generic;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace JYControl
{
	/// <summary>
	/// Base class for the led renderers
	/// </summary>
	public class LBLedRenderer : LBRendererBase
	{
		#region (* Variables *)
		private RectangleF drawRect;
		private RectangleF rectLed;
		private RectangleF rectLabel;
		#endregion

		#region (* Properies *)
		/// <summary>
		/// Get the associated led object
		/// </summary>
		public LBLed Led
		{
			get { return this.Control as LBLed; }
		}
		#endregion

		#region (* Overrided method *)
		/// <summary>
		/// Update the rectangles for drawing
		/// </summary>
		/// <returns></returns>
		public override bool Update()
		{
			// Check Led object
			if (this.Led == null)
				throw new NullReferenceException("Invalid 'Led' object");

			// Dati del rettangolo
			float x, y, w, h;
			x = 0;
			y = 0;
			w = this.Led.Size.Width;
			h = this.Led.Size.Height;

			// Rettangolo di disegno
			drawRect.X = x;
			drawRect.Y = y;
			drawRect.Width = w - 2;
			drawRect.Height = h - 2;
			if (drawRect.Width <= 0)
				drawRect.Width = 20;
			if (drawRect.Height <= 0)
				drawRect.Height = 20;

			this.rectLed = drawRect;
			this.rectLabel = drawRect;

			if (this.Led.LabelPosition == LBLed.LedLabelPosition.Bottom)
			{
				this.rectLed.X = (this.rectLed.Width * 0.5F) - (this.Led.LedSize.Width * 0.5F);
				this.rectLed.Width = this.Led.LedSize.Width;
				this.rectLed.Height = this.Led.LedSize.Height;

				this.rectLabel.Y = this.rectLed.Bottom;
			}

			else if (this.Led.LabelPosition == LBLed.LedLabelPosition.Top)
			{
				this.rectLed.X = (this.rectLed.Width * 0.5F) - (this.Led.LedSize.Width * 0.5F);
				this.rectLed.Y = this.rectLed.Height - this.Led.LedSize.Height;
				this.rectLed.Width = this.Led.LedSize.Width;
				this.rectLed.Height = this.Led.LedSize.Height;

				this.rectLabel.Height = this.rectLed.Top;
			}

			else if (this.Led.LabelPosition == LBLed.LedLabelPosition.Left)
			{
				this.rectLed.X = this.rectLed.Width - this.Led.LedSize.Width;
				this.rectLed.Width = this.Led.LedSize.Width;
				this.rectLed.Height = this.Led.LedSize.Height;

				this.rectLabel.Width = this.rectLabel.Width - this.rectLed.Width;
			}

			else if (this.Led.LabelPosition == LBLed.LedLabelPosition.Right)
			{
				this.rectLed.Width = this.Led.LedSize.Width;
				this.rectLed.Height = this.Led.LedSize.Height;

				this.rectLabel.X = this.rectLed.Right;
			}

			return true;
		}

		/// <summary>
		/// Draw the led object
		/// </summary>
		/// <param name="Gr"></param>
		public override void Draw(Graphics Gr)
		{
			if (Gr == null)
				throw new ArgumentNullException("Gr");

			LBLed ctrl = this.Led;
			if (ctrl == null)
				throw new NullReferenceException("Associated control is not valid");

			Rectangle rc = ctrl.Bounds;

			this.DrawBackground(Gr, rc);

			if (this.rectLed.Width <= 0)
				this.rectLed.Width = rectLabel.Width;
			if (this.rectLed.Height <= 0)
				this.rectLed.Height = ctrl.LedSize.Height;

			this.DrawLed(Gr, this.rectLed);

			this.DrawLabel(Gr, this.rectLabel);
		}
		#endregion

		#region (* Virtual method *)
		/// <summary>
		/// Draw the background of the control
		/// </summary>
		/// <param name="Gr"></param>
		/// <param name="rc"></param>
		/// <returns></returns>
		public virtual bool DrawBackground(Graphics Gr, RectangleF rc)
		{
			if (this.Led == null)
				return false;

			Color c = this.Led.BackColor;
			SolidBrush br = new SolidBrush(c);
			Pen pen = new Pen(c);

			Rectangle _rcTmp = new Rectangle(0, 0, this.Led.Width, this.Led.Height);
			Gr.DrawRectangle(pen, _rcTmp);
			Gr.FillRectangle(br, rc);

			br.Dispose();
			pen.Dispose();

			return true;
		}

		/// <summary>
		/// Draw the body of the control
		/// </summary>
		/// <param name="Gr"></param>
		/// <param name="rc"></param>
		/// <returns></returns>
		public virtual bool DrawLed(Graphics Gr, RectangleF rc)
		{
			if (this.Led == null)
				return false;

			Color cDarkOff = LBColorManager.StepColor(Color.LightGray, 20);
			Color cDarkOn = LBColorManager.StepColor(this.Led.LedColor, 60);

			LinearGradientBrush brOff = new LinearGradientBrush(rc,
																	 Color.Gray,
																	 cDarkOff,
																  45);

			LinearGradientBrush brOn = new LinearGradientBrush(rc,
																   this.Led.LedColor,
																   cDarkOn,
																   45);
			if (this.Led.State == LBLed.LedState.Blink)
			{
				if (this.Led.BlinkIsOn == false)
				{
					if (this.Led.Style == LBLed.LedStyle.Circular)
						Gr.FillEllipse(brOff, rc);
					else if (this.Led.Style == LBLed.LedStyle.Rectangular)
						Gr.FillRectangle(brOff, rc);
				}
				else
				{
					if (this.Led.Style == LBLed.LedStyle.Circular)
						Gr.FillEllipse(brOn, rc);
					else if (this.Led.Style == LBLed.LedStyle.Rectangular)
						Gr.FillRectangle(brOn, rc);
				}
			}
			else
			{
				if (this.Led.State == LBLed.LedState.Off)
				{
					if (this.Led.Style == LBLed.LedStyle.Circular)
						Gr.FillEllipse(brOff, rc);
					else if (this.Led.Style == LBLed.LedStyle.Rectangular)
						Gr.FillRectangle(brOff, rc);
				}
				else
				{
					if (this.Led.Style == LBLed.LedStyle.Circular)
						Gr.FillEllipse(brOn, rc);
					else if (this.Led.Style == LBLed.LedStyle.Rectangular)
						Gr.FillRectangle(brOn, rc);
				}
			}

			brOff.Dispose();
			brOn.Dispose();

			return true;
		}

		/// <summary>
		/// Draw the text of the control
		/// </summary>
		/// <param name="Gr"></param>
		/// <param name="rc"></param>
		/// <returns></returns>
		public virtual bool DrawLabel(Graphics Gr, RectangleF rc)
		{
			if (this.Led == null)
				return false;

			if (this.Led.Label == String.Empty)
				return false;

			SizeF size = Gr.MeasureString(this.Led.Label, this.Led.Font);

			SolidBrush br1 = new SolidBrush(this.Led.ForeColor);

			float hPos = 0;
			float vPos = 0;
			switch (this.Led.LabelPosition)
			{
				case LBLed.LedLabelPosition.Top:
					hPos = (float)(rc.Width * 0.5F) - (float)(size.Width * 0.5F);
					vPos = rc.Bottom - size.Height;
					break;

				case LBLed.LedLabelPosition.Bottom:
					hPos = (float)(rc.Width * 0.5F) - (float)(size.Width * 0.5F);
					break;

				case LBLed.LedLabelPosition.Left:
					hPos = rc.Width - size.Width;
					vPos = (float)(rc.Height * 0.5F) - (float)(size.Height * 0.5F);
					break;

				case LBLed.LedLabelPosition.Right:
					vPos = (float)(rc.Height * 0.5F) - (float)(size.Height * 0.5F);
					break;
			}

			Gr.DrawString(this.Led.Label,
							this.Led.Font,
							br1,
							rc.Left + hPos,
							rc.Top + vPos);

			return true;
		}
		#endregion
	}
}