//---------------------------------------------------------------------------------------------------------------------------------------------------
// <copyright file="GameController.cs" company="DarkWynter Studios">
//     Copyright (C)2007 DarkWynter Studios.  All rights reserved.
// </copyright>
//---------------------------------------------------------------------------------------------------------------------------------------------------
// {Contact : darkwynter.com for licensing information
//---------------------------------------------------------------------------------------------------------------------------------------------------



namespace DarkWynterEngine.Controllers
{
    using System;
    using System.Collections.Generic;
    using System.Text;
    using Microsoft.Xna.Framework;
    using Microsoft.Xna.Framework.Input;
    using System.Diagnostics;

    /// <summary>
    /// InputEvent class can be used for Key input or controller input
    /// Every instance of InputEvent is tied to a particular key or button
    /// The Held() or NewPress() commands are used to check that button
    /// The current KeyboardState or GamePadState (for the appropriate player)
    /// must be passed into the functions 
    /// </summary>
    public class InputEvent
    {
        //Button we are checking for
        Buttons button;
        //Keyboard key we are checking for?
        Keys key;
        //timer to make sure the key isn't taken more than once at a time
        Stopwatch keyboardTimer;
        const int KEY_TIMER_MAX_MILLI = 100;

        //If the button was just pressed
        bool buttonPressed = false;

        /// <summary>
        /// Initialize event with a button from the controller
        /// </summary>
        /// <param name="buttonID">Button to check, use Buttons enum</param>
        public InputEvent(Buttons buttonID)
        {
            button = buttonID;
        }

        /// <summary>
        /// Initialize event with key from the keyboard
        /// </summary>
        /// <param name="keyID">Key to check, use Keys enum</param>
        public InputEvent(Keys keyID)
        {
            key = keyID;
            keyboardTimer = Stopwatch.StartNew();
        }

        /// <summary>
        /// Check if a key was just pressed and not held down from the last check
        /// Use this if you don't want input from a key to carry over to the next frame
        /// </summary>
        /// <param name="keyState">Current KeyboardState</param>
        /// <returns>Whether key was just pressed</returns>
        public bool NewPress(KeyboardState keyState)
        {
            if (keyState.IsKeyDown(key))
            {
                if (keyboardTimer.ElapsedMilliseconds > KEY_TIMER_MAX_MILLI)
                {
                    keyboardTimer.Reset();
                    keyboardTimer.Start();
                    return true;
                }
                else
                {
                    return false;
                }
            }
            return false;
        }

        /// <summary>
        /// Check if a key is being held down
        /// </summary>
        /// <param name="keyState">Current KeyboardState</param>
        /// <returns>Whether key is being held down</returns>
        public bool Held(KeyboardState keyState)
        {
            if (keyState.IsKeyDown(key))
            {
                return true;
            }
            else
            {
                return false;
            }
        }

        /// <summary>
        /// Check if a button was just pressed and not held down from the last check
        /// Use this if you don't want input from a button to carry over to the next frame
        /// </summary>
        /// <param name="gamePad">Current GamePadState from appropriate player</param>
        /// <returns>Whether button was just pressed</returns>
        public bool NewPress(GamePadState gamePad)
        {
            if (gamePad.IsButtonDown(button))
            {
                //check if it was already pressed before
                if (buttonPressed)
                {
                    return false;
                }
                else
                {
                    buttonPressed = true;
                    return true;
                }
            }
            else
            {
                buttonPressed = false;
            }
            return false;
        }

        /// <summary>
        /// Check if a button is being held down
        /// </summary>
        /// <param name="gamePad">Current GamePadState from appropriate player</param>
        /// <returns>Whether button is being held down</returns>
        public bool Held(GamePadState gamePad)
        {
            if (gamePad.IsButtonDown(button))
            {
                return true;
            }
            else
            {
                buttonPressed = false;
                return false;
            }
        }
    }
}