using System;

using System.Drawing;



namespace GammaJul.LgLcd {



	/// <summary>

	/// Represents a progress bar on a <see cref="LcdGdiPage"/>.

	/// </summary>

	public class LcdGdiProgressBar : LcdGdiObject {

		private Brush _progressBrush;

		private int _minimum;

		private int _value;

		private int _maximum = 100;

		private bool _isVertical;



		/// <summary>

		/// Gets or sets the brush that is used to fill the progress indicator.

		/// <see cref="Brush"/> is used as a background to the bar,

		/// while <see cref="ProgressBrush"/> represents the progress part.

		/// </summary>

		public Brush ProgressBrush {

			get { return _progressBrush; }

			set {

				if (_progressBrush != value) {

					_progressBrush = value;

					HasChanged = true;

				}

			}

		}



		/// <summary>

		/// Gets or sets the minimum value of this progress bar.

		/// </summary>

		public int Minimum {

			get { return _minimum; }

			set {

				int newValue = Math.Min(value, _maximum);

				if (_minimum != newValue) {

					_minimum = newValue;

					_value = Math.Max(_value, newValue);

					HasChanged = true;

				}

			}

		}



		/// <summary>

		/// Gets or sets the maximum value of this progress bar.

		/// </summary>

		public int Maximum {

			get { return _maximum; }

			set {

				int newValue = Math.Max(value, _minimum);

				if (_maximum != newValue) {

					_maximum = newValue;

					_value = Math.Min(_value, newValue);

					HasChanged = true;

				}

			}

		}



		/// <summary>

		/// Gets or sets the current value of this progress bar.

		/// </summary>

		public int Value {

			get { return _value; }

			set {

				int newValue = Math.Max(Math.Min(value, _maximum), _minimum);

				if (_value != newValue) {

					_value = newValue;

					HasChanged = true;

				}

			}

		}



		/// <summary>

		/// Gets or sets whether this progress bar is vertical.

		/// The default value is <c>false</c>.

		/// </summary>

		public bool IsVertical {

			get { return _isVertical; }

			set {

				if (_isVertical != value) {

					_isVertical = value;

					HasChanged = true;

				}

			}

		}





		/// <summary>

		/// Draws the progress bar.

		/// </summary>

		/// <param name="page">Page where this object will be drawn.</param>

		/// <param name="graphics"><see cref="Graphics"/> to use for drawing.</param>

		protected internal override void Draw(LcdGdiPage page, Graphics graphics) {

			if (Brush != null)

				graphics.FillRectangle(Brush, AbsolutePosition.X, AbsolutePosition.Y, FinalSize.Width - 1.0f, FinalSize.Height - 1.0f);

			float penWidth;

			if (Pen != null) {

				graphics.DrawRectangle(Pen, AbsolutePosition.X, AbsolutePosition.Y, FinalSize.Width - 1.0f, FinalSize.Height - 1.0f);

				penWidth = Pen.Width;

			}

			else

				penWidth = 0.0f;

			if (_progressBrush != null) {

				int zeroBasedMaximum = _maximum - _minimum;

				int zeroBasedValue = _value - _minimum;

				float percent = zeroBasedMaximum == 0 ? 0.0f : zeroBasedValue / (float) zeroBasedMaximum;

				if (_isVertical) {

					float indicatorHeight = (FinalSize.Height - penWidth * 2) * percent;

					graphics.FillRectangle(_progressBrush, AbsolutePosition.X + penWidth,

					                       AbsolutePosition.Y + FinalSize.Height - penWidth - indicatorHeight,

					                       FinalSize.Width - penWidth * 2, indicatorHeight);

				}

				else {

					graphics.FillRectangle(_progressBrush, AbsolutePosition.X + penWidth, AbsolutePosition.Y + penWidth,

					                       (FinalSize.Width - penWidth * 2) * percent, FinalSize.Height - penWidth * 2);

				}

			}

		}





		/// <summary>

		/// Creates a new <see cref="LcdGdiProgressBar"/> with a black edge, white fill

		/// and black indicator part, which is the most common for monochrome devices.

		/// </summary>

		public LcdGdiProgressBar() {

			Pen = Pens.Black;

			Brush = Brushes.White;

			ProgressBrush = Brushes.Black;

		}



		/// <summary>

		/// Creates a new <see cref="LcdGdiProgressBar"/> with the specified pen for the edge,

		/// brush for the fill, and brush for the progression.

		/// </summary>

		/// <param name="pen">Pen to use to draw the edge of this object.</param>

		/// <param name="brush">Brush to use to draw the fill of this object.</param>

		/// <param name="progressBrush">Brush to use to fill the progress indicator.</param>

		public LcdGdiProgressBar(Pen pen, Brush brush, Brush progressBrush) {

			Pen = pen;

			Brush = brush;

			ProgressBrush = progressBrush;

		}

	}



}