using System;
using System.Collections.Generic;
using System.Windows.Forms;

using Microsoft.Xna.Framework;

namespace Nuclex
{
    /// <summary>Service allowing object to monitor user input for a form or control</summary>
    public interface IInputPublisherService
    {
        /// <summary>Fired when the mouse has been clicked</summary>
        event MouseEventHandler MouseClick;
        /// <summary>Fired when a mouse button is pressed down</summary>
        event MouseEventHandler MouseDown;
        /// <summary>Fired when a mouse button is released again</summary>
        event MouseEventHandler MouseUp;
        /// <summary>Fired when the mouse has been moved</summary>
        event MouseEventHandler MouseMove;

        /// <summary>Fired when a character has been entered</summary>
        event KeyPressEventHandler KeyPress;
        /// <summary>Fired when a key is pressed down</summary>
        event KeyEventHandler KeyDown;
        /// <summary>Fired when a key is released again</summary>
        event KeyEventHandler KeyUp;
    }

    /// <summary>Service allowing object to monitor user input for a form or control</summary>
    internal class ControlInputPublisher : IInputPublisherService, IDisposable
    {
        /// <summary>Fired when the mouse has been clicked</summary>
        public event MouseEventHandler MouseClick;
        /// <summary>Fired when a mouse button is pressed down</summary>
        public event MouseEventHandler MouseDown;
        /// <summary>Fired when a mouse button is released again</summary>
        public event MouseEventHandler MouseUp;
        /// <summary>Fired when the mouse has been moved</summary>
        public event MouseEventHandler MouseMove;

        /// <summary>Fired when a character has been entered</summary>
        public event KeyPressEventHandler KeyPress;
        /// <summary>Fired when a key is pressed down</summary>
        public event KeyEventHandler KeyDown;
        /// <summary>Fired when a key is released again</summary>
        public event KeyEventHandler KeyUp;

        /// <summary>Initializes a new user control input event publisher</summary>
        /// <param name="control">User control whose input events to publish</param>
        public ControlInputPublisher(UserControl control)
        {
            this.control = control;

            control.MouseClick += new MouseEventHandler(mouseClick);
            control.MouseDown += new MouseEventHandler(mouseDown);
            control.MouseUp += new MouseEventHandler(mouseUp);
            control.MouseMove += new MouseEventHandler(mouseMove);
            control.KeyDown += new KeyEventHandler(keyDown);
            control.KeyPress += new KeyPressEventHandler(keyPress);
            control.KeyUp += new KeyEventHandler(keyUp);
        }

        /// <summary>Immediately releases all resources owned by the object</summary>
        public void Dispose()
        {
            if (this.control != null)
            {
                this.control.MouseClick -= new MouseEventHandler(mouseClick);
                this.control.MouseDown -= new MouseEventHandler(mouseDown);
                this.control.MouseUp -= new MouseEventHandler(mouseUp);
                this.control.MouseMove -= new MouseEventHandler(mouseMove);
                this.control.KeyDown -= new KeyEventHandler(keyDown);
                this.control.KeyPress -= new KeyPressEventHandler(keyPress);
                this.control.KeyUp -= new KeyEventHandler(keyUp);

                this.control = null;

                GC.SuppressFinalize(this);
            }
        }

        /// <summary>Called when a mouse button has been clicked</summary>
        /// <param name="sender">Window on which the mouse has been clicked</param>
        /// <param name="arguments">
        ///   Informations about the mouse state at the time of clicking
        /// </param>
        private void mouseClick(object sender, MouseEventArgs arguments)
        {
            if (MouseClick != null)
                MouseClick(sender, arguments);
        }

        /// <summary>Called when a mouse button has been pressed</summary>
        /// <param name="sender">Window on which the button has been pressed</param>
        /// <param name="arguments">
        ///   Informations about the mouse state at the time of press
        /// </param>
        private void mouseDown(object sender, MouseEventArgs arguments)
        {
            if (MouseDown != null)
                MouseDown(sender, arguments);
        }

        /// <summary>Called when a mouse button has been released</summary>
        /// <param name="sender">Window on which the button has been released</param>
        /// <param name="arguments">
        ///   Informations about the mouse state at the time of release
        /// </param>
        private void mouseUp(object sender, MouseEventArgs arguments)
        {
            if (MouseUp != null)
                MouseUp(sender, arguments);
        }

        /// <summary>Called when the mouse has been moved</summary>
        /// <param name="sender">Window over which the mouse has been moved</param>
        /// <param name="arguments">
        ///   Informations about the mouse state at the time of movement
        /// </param>
        private void mouseMove(object sender, MouseEventArgs arguments)
        {
            if (MouseMove != null)
                MouseMove(sender, arguments);
        }

        /// <summary>Called when a character has been entered</summary>
        /// <param name="sender">Window having the input focus</param>
        /// <param name="arguments">
        ///   Informations about the keyboard state at the time of entering
        /// </param>
        private void keyPress(object sender, KeyPressEventArgs arguments)
        {
            if (KeyPress != null)
                KeyPress(sender, arguments);
        }

        /// <summary>Called when a key has been pressed</summary>
        /// <param name="sender">Window having the input focus</param>
        /// <param name="arguments">
        ///   Informations about the keyboard state at the time of press
        /// </param>
        private void keyDown(object sender, KeyEventArgs arguments)
        {
            if (KeyDown != null)
                KeyDown(sender, arguments);
        }

        /// <summary>Called when a key has been released</summary>
        /// <param name="sender">Window having the input focus</param>
        /// <param name="arguments">
        ///   Informations about the keyboard state at the time of release
        /// </param>
        private void keyUp(object sender, KeyEventArgs arguments)
        {
            if (KeyUp != null)
                KeyUp(sender, arguments);
        }

        /// <summary>User control whose input events this publisher makes public</summary>
        private UserControl control;
    }
} // namespace Nuclex