//-----------------------------------------------------------------------------
// InputState.cs
//
// Microsoft XNA Community Game Platform
// Copyright (C) Microsoft Corporation. All rights reserved.
//-----------------------------------------------------------------------------

using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Input;
using Microsoft.Xna.Framework.Input.Touch;

namespace AlienGameSample
{
    /// <summary>
    /// Helper for reading input from keyboard and gamepad. This class tracks both
    /// the current and previous state of both input devices, and implements query
    /// properties for high level input actions such as "move up through the menu"
    /// or "pause the game".
    /// </summary>
    public class InputState
	{
        public GamePadState CurrentGamePadStates;
        public GamePadState LastGamePadStates;
		public TouchCollection TouchStates;
		

        /// <summary>
        /// Constructs a new input state.
        /// </summary>
        public InputState()
        {
			CurrentGamePadStates = GamePad.GetState(PlayerIndex.One);
			TouchStates = TouchPanel.GetState();
        }

        /// <summary>
        /// Checks for a "menu up" input action, from any player,
        /// on either keyboard or gamepad.
        /// </summary>
        public bool MenuUp
        {
            get
            {
                return IsNewButtonPress(Buttons.DPadUp);
            }
        }

        /// <summary>
        /// Checks for a "menu down" input action, from any player,
        /// on either keyboard or gamepad.
        /// </summary>
        public bool MenuDown
        {
            get
            {
                return IsNewButtonPress(Buttons.DPadDown);
            }
        }

        /// <summary>
        /// Checks for a "menu select" input action, from any player,
        /// on either keyboard or gamepad.
        /// </summary>
        public bool MenuSelect
        {
            get
            {
                return IsNewButtonPress(Buttons.A);
            }
        }

        /// <summary>
        /// Checks for a "menu cancel" input action, from any player,
        /// on either keyboard or gamepad.
        /// </summary>
        public bool MenuCancel
        {
            get
            {
                return IsNewButtonPress(Buttons.Back);
            }
        }

        /// <summary>
        /// Checks for a "pause the game" input action, from any player,
        /// on either keyboard or gamepad.
        /// </summary>
        public bool PauseGame
        {
            get
            {
                return IsNewButtonPress(Buttons.Back) ||
                       IsNewButtonPress(Buttons.Start);
            }
        }

        /// <summary>
        /// Reads the latest state of the keyboard and gamepad.
        /// </summary>
        public void Update()
        {
            LastGamePadStates = CurrentGamePadStates;
            CurrentGamePadStates = GamePad.GetState(PlayerIndex.One);
			TouchStates = TouchPanel.GetState();
        }

        /// <summary>
        /// Helper for checking if a button was newly pressed during this update,
        /// by any player.
        /// </summary>
        public bool IsNewButtonPress(Buttons button)
        {
            return IsNewButtonPress(button, PlayerIndex.One);
        }

        /// <summary>
        /// Helper for checking if a button was newly pressed during this update,
        /// by the specified player.
        /// </summary>
        public bool IsNewButtonPress(Buttons button, PlayerIndex playerIndex)
        {
            return (CurrentGamePadStates.IsButtonDown(button) &&
                    LastGamePadStates.IsButtonUp(button));
        }

        /// <summary>
        /// Checks for a "menu select" input action from the specified player.
        /// </summary>
        public bool IsMenuSelect(PlayerIndex playerIndex)
        {
            return IsNewButtonPress(Buttons.A, playerIndex) ||
                   IsNewButtonPress(Buttons.Start, playerIndex);
        }

        /// <summary>
        /// Checks for a "menu cancel" input action from the specified player.
        /// </summary>
        public bool IsMenuCancel(PlayerIndex playerIndex)
        {
            return IsNewButtonPress(Buttons.B, playerIndex) ||
                   IsNewButtonPress(Buttons.Back, playerIndex);
        }
    }
}