/*      _______   __   __   __   ______   __   __   _______   __   __
 *     / _____/\ / /\ / /\ / /\ / ____/\ / /\ / /\ / ___  /\ /  |\/ /\
 *    / /\____\// / // / // / // /\___\// /_// / // /\_/ / // , |/ / /
 *   / / /__   / / // / // / // / /    / ___  / // ___  / // /| ' / /
 *  / /_// /\ / /_// / // / // /_/_   / / // / // /\_/ / // / |  / /
 * /______/ //______/ //_/ //_____/\ /_/ //_/ //_/ //_/ //_/ /|_/ /
 * \______\/ \______\/ \_\/ \_____\/ \_\/ \_\/ \_\/ \_\/ \_\/ \_\/
 *
 * Copyright (c) 2004 - 2008 Olof Naessén and Per Larsson
 *
 *
 * Per Larsson a.k.a finalman
 * Olof Naessén a.k.a jansem/yakslem
 *
 * Visit: http://guichan.sourceforge.net
 *
 * License: (BSD)
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 * 3. Neither the name of Guichan nor the names of its contributors may
 *    be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
 * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/*
 * For comments regarding functions please see the header file.
 */

#include "guichan/sdl/sdlinput.hpp"

#include "guichan/exception.hpp"

namespace gcn
{
    SDLInput::SDLInput()
    {
        mMouseInWindow = true;
        mMouseDown = false;
    }

    bool SDLInput::isKeyQueueEmpty()
    {
        return mKeyInputQueue.empty();
    }

    KeyInput SDLInput::dequeueKeyInput()
    {
        KeyInput keyInput;

        if (mKeyInputQueue.empty())
        {
            throw GCN_EXCEPTION("The queue is empty.");
        }

        keyInput = mKeyInputQueue.front();
        mKeyInputQueue.pop();

        return keyInput;
    }

    bool SDLInput::isMouseQueueEmpty()
    {
        return mMouseInputQueue.empty();
    }

    MouseInput SDLInput::dequeueMouseInput()
    {
        MouseInput mouseInput;

        if (mMouseInputQueue.empty())
        {
            throw GCN_EXCEPTION("The queue is empty.");
        }

        mouseInput = mMouseInputQueue.front();
        mMouseInputQueue.pop();

        return mouseInput;
    }

    void SDLInput::pushInput(SDL_Event event)
    {
        KeyInput keyInput;
        MouseInput mouseInput;

        switch (event.type)
        {
            case SDL_KEYDOWN:
            {
                int value = convertSDLEventToGuichanKeyValue(event);

                if (value == -1)
                {
                    value = (int)event.key.keysym.unicode;
                } 
               
                keyInput.setKey(Key(value));
                keyInput.setType(KeyInput::PRESSED);
                keyInput.setShiftPressed(event.key.keysym.mod & KMOD_SHIFT);
                keyInput.setControlPressed(event.key.keysym.mod & KMOD_CTRL);
                keyInput.setAltPressed(event.key.keysym.mod & KMOD_ALT);
                keyInput.setMetaPressed(event.key.keysym.mod & KMOD_META);
                keyInput.setNumericPad(event.key.keysym.sym >= SDLK_KP0
                                     && event.key.keysym.sym <= SDLK_KP_EQUALS);

                mKeyInputQueue.push(keyInput);
                break;
            }

            case SDL_KEYUP:
            {
                int value = convertSDLEventToGuichanKeyValue(event);

                if (value == -1)
                {
                    value = (int)event.key.keysym.sym;
                } 

                keyInput.setKey(Key(value));
                keyInput.setType(KeyInput::RELEASED);
                keyInput.setShiftPressed(event.key.keysym.mod & KMOD_SHIFT);
                keyInput.setControlPressed(event.key.keysym.mod & KMOD_CTRL);
                keyInput.setAltPressed(event.key.keysym.mod & KMOD_ALT);
                keyInput.setMetaPressed(event.key.keysym.mod & KMOD_META);
                keyInput.setNumericPad(event.key.keysym.sym >= SDLK_KP0
                                     && event.key.keysym.sym <= SDLK_KP_EQUALS);

                mKeyInputQueue.push(keyInput);
                break;
            }

            case SDL_MOUSEBUTTONDOWN:
                mMouseDown = true;
                mouseInput.setX(event.button.x);
                mouseInput.setY(event.button.y);
                mouseInput.setButton(convertMouseButton(event.button.button));

                if (event.button.button == SDL_BUTTON_WHEELDOWN)
                {
                  mouseInput.setType(MouseInput::WHEEL_MOVED_DOWN);
                }
                else if (event.button.button == SDL_BUTTON_WHEELUP)
                {
                  mouseInput.setType(MouseInput::WHEEL_MOVED_UP);
                }
                else
                {
                  mouseInput.setType(MouseInput::PRESSED);
                }
                mouseInput.setTimeStamp(SDL_GetTicks());
                mMouseInputQueue.push(mouseInput);
                break;

            case SDL_MOUSEBUTTONUP:
                mMouseDown = false;
                mouseInput.setX(event.button.x);
                mouseInput.setY(event.button.y);
                mouseInput.setButton(convertMouseButton(event.button.button));
                mouseInput.setType(MouseInput::RELEASED);
                mouseInput.setTimeStamp(SDL_GetTicks());
                mMouseInputQueue.push(mouseInput);
                break;

            case SDL_MOUSEMOTION:
                mouseInput.setX(event.button.x);
                mouseInput.setY(event.button.y);
                mouseInput.setButton(MouseInput::EMPTY);
                mouseInput.setType(MouseInput::MOVED);
                mouseInput.setTimeStamp(SDL_GetTicks());
                mMouseInputQueue.push(mouseInput);
                break;

            case SDL_ACTIVEEVENT:
                /*
                * This occurs when the mouse leaves the window and the Gui-chan
                * application loses its mousefocus.
                */
                if ((event.active.state & SDL_APPMOUSEFOCUS)
                  && !event.active.gain)
                {
                  mMouseInWindow = false;

                  if (!mMouseDown)
                  {
                      mouseInput.setX(-1);
                      mouseInput.setY(-1);
                      mouseInput.setButton(MouseInput::EMPTY);
                      mouseInput.setType(MouseInput::MOVED);
                      mMouseInputQueue.push(mouseInput);
                  }
                }

                if ((event.active.state & SDL_APPMOUSEFOCUS)
                  && event.active.gain)
                {
                  mMouseInWindow = true;
                }
                break;

        } // end switch
    }

    int SDLInput::convertMouseButton(int button)
    {
        switch (button)
        {
          case SDL_BUTTON_LEFT:
              return MouseInput::LEFT;
              break;
          case SDL_BUTTON_RIGHT:
              return MouseInput::RIGHT;
              break;
          case SDL_BUTTON_MIDDLE:
              return MouseInput::MIDDLE;
              break;
          default:
              // We have an unknown mouse type which is ignored.
              return button;
        }
    }

    int SDLInput::convertSDLEventToGuichanKeyValue(SDL_Event event)
    {
        int value = -1;

        switch (event.key.keysym.sym)
        {
          case SDLK_TAB:
              value = Key::TAB;
              break;
          case SDLK_LALT:
              value = Key::LEFT_ALT;
              break;
          case SDLK_RALT:
              value = Key::RIGHT_ALT;
              break;
          case SDLK_LSHIFT:
              value = Key::LEFT_SHIFT;
              break;
          case SDLK_RSHIFT:
              value = Key::RIGHT_SHIFT;
              break;
          case SDLK_LCTRL:
              value = Key::LEFT_CONTROL;
              break;
          case SDLK_RCTRL:
              value = Key::RIGHT_CONTROL;
              break;
          case SDLK_BACKSPACE:
              value = Key::BACKSPACE;
              break;
          case SDLK_PAUSE:
              value = Key::PAUSE;
              break;
          case SDLK_SPACE:
              // Special characters like ~ (tilde) ends up
              // with the keysym.sym SDLK_SPACE which
              // without this check would be lost. The check
              // is only valid on key down events in SDL.
              if (event.type == SDL_KEYUP || event.key.keysym.unicode == ' ')
              {
                  value = Key::SPACE;
              }
              break;
          case SDLK_ESCAPE:
              value = Key::ESCAPE;
              break;
          case SDLK_DELETE:
              value = Key::DELETE;
              break;
          case SDLK_INSERT:
              value = Key::INSERT;
              break;
          case SDLK_HOME:
              value = Key::HOME;
              break;
          case SDLK_END:
              value = Key::END;
              break;
          case SDLK_PAGEUP:
              value = Key::PAGE_UP;
              break;
          case SDLK_PRINT:
              value = Key::PRINT_SCREEN;
              break;
          case SDLK_PAGEDOWN:
              value = Key::PAGE_DOWN;
              break;
          case SDLK_F1:
              value = Key::F1;
              break;
          case SDLK_F2:
              value = Key::F2;
              break;
          case SDLK_F3:
              value = Key::F3;
              break;
          case SDLK_F4:
              value = Key::F4;
              break;
          case SDLK_F5:
              value = Key::F5;
              break;
          case SDLK_F6:
              value = Key::F6;
              break;
          case SDLK_F7:
              value = Key::F7;
              break;
          case SDLK_F8:
              value = Key::F8;
              break;
          case SDLK_F9:
              value = Key::F9;
              break;
          case SDLK_F10:
              value = Key::F10;
              break;
          case SDLK_F11:
              value = Key::F11;
              break;
          case SDLK_F12:
              value = Key::F12;
              break;
          case SDLK_F13:
              value = Key::F13;
              break;
          case SDLK_F14:
              value = Key::F14;
              break;
          case SDLK_F15:
              value = Key::F15;
              break;
          case SDLK_NUMLOCK:
              value = Key::NUM_LOCK;
              break;
          case SDLK_CAPSLOCK:
              value = Key::CAPS_LOCK;
              break;
          case SDLK_SCROLLOCK:
              value = Key::SCROLL_LOCK;
              break;
          case SDLK_RMETA:
              value = Key::RIGHT_META;
              break;
          case SDLK_LMETA:
              value = Key::LEFT_META;
              break;
          case SDLK_LSUPER:
              value = Key::LEFT_SUPER;
              break;
          case SDLK_RSUPER:
              value = Key::RIGHT_SUPER;
              break;
          case SDLK_MODE:
              value = Key::ALT_GR;
              break;
          case SDLK_UP:
              value = Key::UP;
              break;
          case SDLK_DOWN:
              value = Key::DOWN;
              break;
          case SDLK_LEFT:
              value = Key::LEFT;
              break;
          case SDLK_RIGHT:
              value = Key::RIGHT;
              break;
          case SDLK_RETURN:
              value = Key::ENTER;
              break;
          case SDLK_KP_ENTER:
              value = Key::ENTER;
              break;

          default:
              break;
        }

        if (!(event.key.keysym.mod & KMOD_NUM))
        {
            switch (event.key.keysym.sym)
            {
              case SDLK_KP0:
                  value = Key::INSERT;
                  break;
              case SDLK_KP1:
                  value = Key::END;
                  break;
              case SDLK_KP2:
                  value = Key::DOWN;
                  break;
              case SDLK_KP3:
                  value = Key::PAGE_DOWN;
                  break;
              case SDLK_KP4:
                  value = Key::LEFT;
                  break;
              case SDLK_KP5:
                  value = 0;
                  break;
              case SDLK_KP6:
                  value = Key::RIGHT;
                  break;
              case SDLK_KP7:
                  value = Key::HOME;
                  break;
              case SDLK_KP8:
                  value = Key::UP;
                  break;
              case SDLK_KP9:
                  value = Key::PAGE_UP;
                  break;
              default:
                  break;
            }
        }

        return value;
    }
}