#region License
//
// The Open Toolkit Library License
//
// Copyright (c) 2006 - 2013 Stefanos Apostolopoulos for the Open Toolkit library.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights to 
// use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
// the Software, and to permit persons to whom the Software is furnished to do
// so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
// OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
// HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
// WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
// OTHER DEALINGS IN THE SOFTWARE.
//
#endregion

using System;
using System.Collections.Generic;
using OpenTK.Input;

namespace OpenTK.Platform.SDL2
{
    class Sdl2Keyboard : IKeyboardDriver2
    {
        #pragma warning disable 649 // Field never assigned to, compiler bug in Mono 3.4.0
        KeyboardState state;
        #pragma warning restore 649

        public Sdl2Keyboard()
        {
            state.IsConnected = true;
        }

        #region Private Members

        // Unfortunately, SDL does not report KeyDown events
        // when a modifier (e.g. shift, alt, etc) is first pressed.
        // It reports a keydown+keyup event pair when the modifier
        // is *released* - which means that we cannot use modifiers
        // for regular input (e.g. press control to fire a weapon.)
        // For that reason, we should also poll the keyboard directly
        // as necessary.
        // Fixme: this does not appear to work as expected.
        void UpdateModifiers()
        {
            Keymod mod = SDL.GetModState();

            state[Key.LAlt] = (mod & Keymod.LALT) != 0;
            state[Key.RAlt] = (mod & Keymod.RALT) != 0;
            state[Key.LControl] = (mod & Keymod.LCTRL) != 0;
            state[Key.RControl] = (mod & Keymod.RCTRL) != 0;
            state[Key.LShift] = (mod & Keymod.LSHIFT) != 0;
            state[Key.RShift] = (mod & Keymod.RSHIFT) != 0;
            state[Key.Menu] = (mod & Keymod.GUI) != 0;
            state[Key.CapsLock] = (mod & Keymod.CAPS) != 0;
            state[Key.NumLock] = (mod & Keymod.NUM) != 0;
            //state[Key.] = (mod & Keymod.MODE) != 0;
        }

        #endregion

        #region Internal Members

        internal void ProcessKeyboardEvent(KeyboardEvent e)
        {
            bool pressed = e.State != 0;
            var scancode = e.Keysym.Scancode;
            Key key = Sdl2KeyMap.GetKey(scancode);

            if (key != Key.Unknown)
            {
                state[key] = pressed;
            }
        }

        #endregion

        #region IKeyboardDriver2 Members

        public KeyboardState GetState()
        {
            //UpdateModifiers(); // Fixme
            return state;
        }

        public KeyboardState GetState(int index)
        {
            //UpdateModifiers(); // Fixme
            if (index == 0)
                return state;
            else
                return new KeyboardState();
        }

        public string GetDeviceName(int index)
        {
            return "SDL2 Default Keyboard";
        }

        #endregion
    }
}