#region License
/* FNA - XNA4 Reimplementation for Desktop Platforms
 * Copyright 2009-2020 Ethan Lee and the MonoGame Team
 *
 * Released under the Microsoft Public License.
 * See LICENSE for details.
 */
#endregion

namespace Microsoft.Xna.Framework.Input
{
	/// <summary>
	/// Represents a mouse state with cursor position and button press information.
	/// </summary>
	public struct MouseState
	{
		#region Public Properties

		/// <summary>
		/// Gets horizontal position of the cursor.
		/// </summary>
		public int X
		{
			get;
			internal set;
		}

		/// <summary>
		/// Gets vertical position of the cursor.
		/// </summary>
		public int Y
		{
			get;
			internal set;
		}

		/// <summary>
		/// Gets state of the left mouse button.
		/// </summary>
		public ButtonState LeftButton
		{
			get;
			internal set;
		}

		/// <summary>
		/// Gets state of the right mouse button.
		/// </summary>
		public ButtonState RightButton
		{
			get;
			internal set;
		}

		/// <summary>
		/// Gets state of the middle mouse button.
		/// </summary>
		public ButtonState MiddleButton
		{
			get;
			internal set;
		}

		/// <summary>
		/// Gets state of the XButton1.
		/// </summary>
		public ButtonState XButton1
		{
			get;
			internal set;
		}

		/// <summary>
		/// Gets state of the XButton2.
		/// </summary>
		public ButtonState XButton2
		{
			get;
			internal set;
		}

		/// <summary>
		/// Returns cumulative scroll wheel value since the game start.
		/// </summary>
		public int ScrollWheelValue
		{
			get;
			internal set;
		}

		#endregion

		#region Public Constructor

		/// <summary>
		/// Initializes a new instance of the MouseState.
		/// </summary>
		/// <param name="x">Horizontal position of the mouse.</param>
		/// <param name="y">Vertical position of the mouse.</param>
		/// <param name="scrollWheel">Mouse scroll wheel's value.</param>
		/// <param name="leftButton">Left mouse button's state.</param>
		/// <param name="middleButton">Middle mouse button's state.</param>
		/// <param name="rightButton">Right mouse button's state.</param>
		/// <param name="xButton1">XBUTTON1's state.</param>
		/// <param name="xButton2">XBUTTON2's state.</param>
		/// <remarks>
		/// Normally <see cref="Mouse.GetState()"/> should be used to get mouse current
		/// state. The constructor is provided for simulating mouse input.
		/// </remarks>
		public MouseState (
			int x,
			int y,
			int scrollWheel,
			ButtonState leftButton,
			ButtonState middleButton,
			ButtonState rightButton,
			ButtonState xButton1,
			ButtonState xButton2
		) : this() {
			X = x;
			Y = y;
			ScrollWheelValue = scrollWheel;
			LeftButton = leftButton;
			MiddleButton = middleButton;
			RightButton = rightButton;
			XButton1 = xButton1;
			XButton2 = xButton2;
		}

		#endregion

		#region Public Static Operators and Override Methods

		/// <summary>
		/// Compares whether two MouseState instances are equal.
		/// </summary>
		/// <param name="left">MouseState instance on the left of the equal sign.</param>
		/// <param name="right">MouseState instance on the right of the equal sign.</param>
		/// <returns>true if the instances are equal; false otherwise.</returns>
		public static bool operator ==(MouseState left, MouseState right)
		{
			return	(	left.X == right.X &&
					left.Y == right.Y &&
					left.LeftButton == right.LeftButton &&
					left.MiddleButton == right.MiddleButton &&
					left.RightButton == right.RightButton &&
					left.ScrollWheelValue == right.ScrollWheelValue	);
		}

		/// <summary>
		/// Compares whether two MouseState instances are not equal.
		/// </summary>
		/// <param name="left">MouseState instance on the left of the equal sign.</param>
		/// <param name="right">MouseState instance on the right of the equal sign.</param>
		/// <returns>true if the objects are not equal; false otherwise.</returns>
		public static bool operator !=(MouseState left, MouseState right)
		{
			return !(left == right);
		}

		/// <summary>
		/// Compares whether current instance is equal to specified object.
		/// </summary>
		/// <param name="obj">The MouseState to compare.</param>
		/// <returns></returns>
		public override bool Equals(object obj)
		{
			return (obj is MouseState) && (this == (MouseState) obj);
		}

		/// <summary>
		/// Gets the hash code for MouseState instance.
		/// </summary>
		/// <returns>Hash code of the object.</returns>
		public override int GetHashCode()
		{
			return base.GetHashCode();
		}

		/// <summary>
		/// Returns a string describing the mouse state.
		/// </summary>
		public override string ToString()
		{
			string buttons = string.Empty;
			if (LeftButton == ButtonState.Pressed)
			{
				buttons = "Left";
			}
			if (RightButton == ButtonState.Pressed)
			{
				if (buttons.Length > 0)
				{
					buttons += " ";
				}
				buttons += "Right";
			}
			if (MiddleButton == ButtonState.Pressed)
			{
				if (buttons.Length > 0)
				{
					buttons += " ";
				}
				buttons += "Middle";
			}
			if (XButton1 == ButtonState.Pressed)
			{
				if (buttons.Length > 0)
				{
					buttons += " ";
				}
				buttons += "XButton1";
			}
			if (XButton2 == ButtonState.Pressed)
			{
				if (buttons.Length > 0)
				{
					buttons += " ";
				}
				buttons += "XButton2";
			}
			if (string.IsNullOrEmpty(buttons))
			{
				buttons = "None";
			}
			return string.Format(
				"[MouseState X={0}, Y={1}, Buttons={2}, Wheel={3}]",
				X,
				Y,
				buttons,
				ScrollWheelValue
			);
		}

		#endregion
	}
}