using System;
using System.Windows.Forms;
using System.Drawing;
using System.Diagnostics;
using System.Globalization;
using System.Runtime.Serialization;

namespace DrawTools
{
	/// <summary>
	/// Rectangle graphic object
	/// </summary>
	class DrawRectangle : DrawTools.DrawObject
	{
        private Rectangle rectangle;

        private const string entryRectangle = "Rect";


        protected Rectangle Rectangle
        {
            get
            {
                return rectangle;
            }
            set
            {
                rectangle = value;
            }
        }
        
		public DrawRectangle() : this(0, 0, 1, 1)
		{
		}

        
        public DrawRectangle(int x, int y, int width, int height) : base()
        {
            rectangle.X = x;
            rectangle.Y = y;
            rectangle.Width = width;
            rectangle.Height = height;
            Initialize();
        }

        /// <summary>
        /// Clone this instance
        /// </summary>
        public override DrawObject Clone()
        {
            DrawRectangle drawRectangle = new DrawRectangle();
            drawRectangle.rectangle = this.rectangle;

            FillDrawObjectFields(drawRectangle);
            return drawRectangle;
        }


        /// <summary>
        /// Draw rectangle
        /// </summary>
        /// <param name="g"></param>
        public override void Draw(Graphics g)
        {
            Pen pen = new Pen(Color, PenWidth);

            g.DrawRectangle(pen, DrawRectangle.GetNormalizedRectangle(Rectangle));

            pen.Dispose();
        }

        protected void SetRectangle(int x, int y, int width, int height)
        {
            rectangle.X = x;
            rectangle.Y = y;
            rectangle.Width = width;
            rectangle.Height = height;
        }


        /// <summary>
        /// Get number of handles
        /// </summary>
        public override int HandleCount
        {
            get
            {
                return 8;
            }
        }


        /// <summary>
        /// Get handle point by 1-based number
        /// </summary>
        /// <param name="handleNumber"></param>
        /// <returns></returns>
        public override Point GetHandle(int handleNumber)
        {
            int x, y, xCenter, yCenter;

            xCenter = rectangle.X + rectangle.Width/2;
            yCenter = rectangle.Y + rectangle.Height/2;
            x = rectangle.X;
            y = rectangle.Y;

            switch ( handleNumber )
            {
                case 1:
                    x = rectangle.X;
                    y = rectangle.Y;
                    break;
                case 2:
                    x = xCenter;
                    y = rectangle.Y;
                    break;
                case 3:
                    x = rectangle.Right;
                    y = rectangle.Y;
                    break;
                case 4:
                    x = rectangle.Right;
                    y = yCenter;
                    break;
                case 5:
                    x = rectangle.Right;
                    y = rectangle.Bottom;
                    break;
                case 6:
                    x = xCenter;
                    y = rectangle.Bottom;
                    break;
                case 7:
                    x = rectangle.X;
                    y = rectangle.Bottom;
                    break;
                case 8:
                    x = rectangle.X;
                    y = yCenter;
                    break;
            }

            return new Point(x, y);

        }

        /// <summary>
        /// Hit test.
        /// Return value: -1 - no hit
        ///                0 - hit anywhere
        ///                > 1 - handle number
        /// </summary>
        /// <param name="point"></param>
        /// <returns></returns>
        public override int HitTest(Point point)
        {
            if ( Selected )
            {
                for ( int i = 1; i <= HandleCount; i++ )
                {
                    if ( GetHandleRectangle(i).Contains(point) )
                        return i;
                }
            }

            if ( PointInObject(point) )
                return 0;

            return -1;
        }

        
        protected override bool PointInObject(Point point)
        {
            return rectangle.Contains(point);
        }
        


        /// <summary>
        /// Get cursor for the handle
        /// </summary>
        /// <param name="handleNumber"></param>
        /// <returns></returns>
        public override Cursor GetHandleCursor(int handleNumber)
        {
            switch ( handleNumber )
            {
                case 1:
                    return Cursors.SizeNWSE;
                case 2:
                    return Cursors.SizeNS;
                case 3:
                    return Cursors.SizeNESW;
                case 4:
                    return Cursors.SizeWE;
                case 5:
                    return Cursors.SizeNWSE;
                case 6:
                    return Cursors.SizeNS;
                case 7:
                    return Cursors.SizeNESW;
                case 8:
                    return Cursors.SizeWE;
                default:
                    return Cursors.Default;
            }
        }

        /// <summary>
        /// Move handle to new point (resizing)
        /// </summary>
        /// <param name="point"></param>
        /// <param name="handleNumber"></param>
        public override void MoveHandleTo(Point point, int handleNumber)
        {
            int left = Rectangle.Left;
            int top = Rectangle.Top;
            int right = Rectangle.Right;
            int bottom = Rectangle.Bottom;

            switch ( handleNumber )
            {
                case 1:
                    left = point.X;
                    top = point.Y;
                    break;
                case 2:
                    top = point.Y;
                    break;
                case 3:
                    right = point.X;
                    top = point.Y;
                    break;
                case 4:
                    right = point.X;
                    break;
                case 5:
                    right = point.X;
                    bottom = point.Y;
                    break;
                case 6:
                    bottom = point.Y;
                    break;
                case 7:
                    left = point.X;
                    bottom = point.Y;
                    break;
                case 8:
                    left = point.X;
                    break;
            }

            SetRectangle(left, top, right - left, bottom - top);
        }


        public override bool IntersectsWith(Rectangle rectangle)
        {
            return Rectangle.IntersectsWith(rectangle);
        }

        /// <summary>
        /// Move object
        /// </summary>
        /// <param name="deltaX"></param>
        /// <param name="deltaY"></param>
        public override void Move(int deltaX, int deltaY)
        {
            rectangle.X += deltaX;
            rectangle.Y += deltaY;
        }

        public override void Dump()
        {
            base.Dump ();

            Trace.WriteLine("rectangle.X = " + rectangle.X.ToString(CultureInfo.InvariantCulture));
            Trace.WriteLine("rectangle.Y = " + rectangle.Y.ToString(CultureInfo.InvariantCulture));
            Trace.WriteLine("rectangle.Width = " + rectangle.Width.ToString(CultureInfo.InvariantCulture));
            Trace.WriteLine("rectangle.Height = " + rectangle.Height.ToString(CultureInfo.InvariantCulture));
        }

        /// <summary>
        /// Normalize rectangle
        /// </summary>
        public override void Normalize()
        {
            rectangle = DrawRectangle.GetNormalizedRectangle(rectangle);
        }

        /// <summary>
        /// Save objevt to serialization stream
        /// </summary>
        /// <param name="info"></param>
        /// <param name="orderNumber"></param>
        public override void SaveToStream(System.Runtime.Serialization.SerializationInfo info, int orderNumber)
        {
            info.AddValue(
                String.Format(CultureInfo.InvariantCulture,
                "{0}{1}",
                entryRectangle, orderNumber),
                rectangle);

            base.SaveToStream (info, orderNumber);
        }

        /// <summary>
        /// LOad object from serialization stream
        /// </summary>
        /// <param name="info"></param>
        /// <param name="orderNumber"></param>
        public override void LoadFromStream(SerializationInfo info, int orderNumber)
        {
            rectangle = (Rectangle)info.GetValue(
                String.Format(CultureInfo.InvariantCulture,
                "{0}{1}",
                entryRectangle, orderNumber),
                typeof(Rectangle));

            base.LoadFromStream (info, orderNumber);
        }


        #region Helper Functions

        public static Rectangle GetNormalizedRectangle(int x1, int y1, int x2, int y2)
        {
            if ( x2 < x1 )
            {
                int tmp = x2;
                x2 = x1;
                x1 = tmp;
            }

            if ( y2 < y1 )
            {
                int tmp = y2;
                y2 = y1;
                y1 = tmp;
            }

            return new Rectangle(x1, y1, x2 - x1, y2 - y1);
        }

        public static Rectangle GetNormalizedRectangle(Point p1, Point p2)
        {
            return GetNormalizedRectangle(p1.X, p1.Y, p2.X, p2.Y);
        }

        public static Rectangle GetNormalizedRectangle(Rectangle r)
        {
            return GetNormalizedRectangle(r.X, r.Y, r.X + r.Width, r.Y + r.Height);
        }

        #endregion

    }
}