/***************************************************************************
 *   Copyright (c) 2017-2019 by the fifechan team                               *
 *   https://github.com/fifengine/fifechan                                 *
 *   This file is part of fifechan.                                        *
 *                                                                         *
 *   fifechan is free software; you can redistribute it and/or             *
 *   modify it under the terms of the GNU Lesser General Public            *
 *   License as published by the Free Software Foundation; either          *
 *   version 2.1 of the License, or (at your option) any later version.    *
 *                                                                         *
 *   This library is distributed in the hope that it will be useful,       *
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU     *
 *   Lesser General Public License for more details.                       *
 *                                                                         *
 *   You should have received a copy of the GNU Lesser General Public      *
 *   License along with this library; if not, write to the                 *
 *   Free Software Foundation, Inc.,                                       *
 *   51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA          *
 ***************************************************************************/

/*      _______   __   __   __   ______   __   __   _______   __   __
 *     / _____/\ / /\ / /\ / /\ / ____/\ / /\ / /\ / ___  /\ /  |\/ /\
 *    / /\____\// / // / // / // /\___\// /_// / // /\_/ / // , |/ / /
 *   / / /__   / / // / // / // / /    / ___  / // ___  / // /| ' / /
 *  / /_// /\ / /_// / // / // /_/_   / / // / // /\_/ / // / |  / /
 * /______/ //______/ //_/ //_____/\ /_/ //_/ //_/ //_/ //_/ /|_/ /
 * \______\/ \______\/ \_\/ \_____\/ \_\/ \_\/ \_\/ \_\/ \_\/ \_\/
 *
 * 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 "fifechan/sdl/sdlinput.hpp"

#include "fifechan/exception.hpp"
#include "fifechan/util/utf8/utf8.hpp"

#include <string>
#include <vector>

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

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

    KeyInput SDLInput::dequeueKeyInput() {
        KeyInput keyInput;

        if (mKeyInputQueue.empty()) {
            throw FCN_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 FCN_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 = convertSDLEventToFifechanKeyValue(event);

                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_GUI);
                keyInput.setNumericPad(event.key.keysym.mod & KMOD_NUM);
                mKeyInputQueue.push(keyInput);
                break;
            }

            case SDL_KEYUP: {
                int value = convertSDLEventToFifechanKeyValue(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_GUI);
                keyInput.setNumericPad(event.key.keysym.mod & KMOD_NUM);
                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));
                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.motion.x);
                mouseInput.setY(event.motion.y);
                mouseInput.setButton(MouseInput::Empty);
                mouseInput.setType(MouseInput::Moved);
                mouseInput.setTimeStamp(SDL_GetTicks());
                mMouseInputQueue.push(mouseInput);
                break;
            }

            case SDL_MOUSEWHEEL: {
                /*if (event.wheel.y > 0 || (event.wheel.direction == SDL_MOUSEWHEEL_FLIPPED && event.wheel.y < 0)) {
                    mouseInput.setType(MouseInput::WheelMovedUp);
                } else if (event.wheel.y < 0 || (event.wheel.direction == SDL_MOUSEWHEEL_FLIPPED && event.wheel.y > 0)) {
                    mouseInput.setType(MouseInput::WheelMovedDown);
                }*/
                /*if (event.wheel.x > 0 || (event.wheel.direction == SDL_MOUSEWHEEL_FLIPPED && event.wheel.x < 0)) {
                    mouseInput.setType(MouseInput::WheelMovedRight);
                } else if (event.wheel.x < 0 || (event.wheel.direction == SDL_MOUSEWHEEL_FLIPPED && event.wheel.x > 0)) {
                    mouseInput.setType(MouseInput::WheelMovedLeft);
                }*/
                if (event.wheel.y > 0) {
                    mouseInput.setType(MouseInput::WheelMovedUp);
                } else if (event.wheel.y < 0) {
                    mouseInput.setType(MouseInput::WheelMovedDown);
                }
                if (event.wheel.x > 0) {
                    mouseInput.setType(MouseInput::WheelMovedRight);
                } else if (event.wheel.x < 0) {
                    mouseInput.setType(MouseInput::WheelMovedLeft);
                }
                int x, y;
                SDL_GetMouseState(&x, &y);
                mouseInput.setX(x);
                mouseInput.setY(y);
                mouseInput.setButton(convertMouseButton(SDL_BUTTON_LEFT));
                mouseInput.setTimeStamp(SDL_GetTicks());
                mMouseInputQueue.push(mouseInput);
                break;
            }

            //case SDL_TEXTEDITING:
            case SDL_TEXTINPUT: {
                std::string text(event.text.text);
                if (!text.empty()) {
                    // hack to transport text
                    std::vector<unsigned short> result;
                    utf8::utf8to16(text.begin(), text.end(), std::back_inserter(result));
                    int value = result[0];

                    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_GUI);
                    keyInput.setNumericPad(event.key.keysym.mod & KMOD_NUM);
                    mKeyInputQueue.push(keyInput);
                }
                break;
            }

            case SDL_WINDOWEVENT: {
                /*
                 * This occurs when the mouse enters/leaves the window and the fifechan
                 * application gains/loses its mousefocus.
                 */
                if (event.window.event == SDL_WINDOWEVENT_ENTER) {
                    mMouseInWindow = true;
                } else if (event.window.event == SDL_WINDOWEVENT_LEAVE) {
                    mMouseInWindow = false;
                    // Why???
                    /*if (!mMouseDown) {
                        mouseInput.setX(-1);
                        mouseInput.setY(-1);
                        mouseInput.setButton(MouseInput::Empty);
                        mouseInput.setType(MouseInput::Moved);
                        mMouseInputQueue.push(mouseInput);
                    }*/
                }
                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;
            case SDL_BUTTON_X1:
                return MouseInput::X1;
                break;
            case SDL_BUTTON_X2:
                return MouseInput::X2;
                break;
            default:
                // We have an unknown mouse type which is ignored.
                return button;
        }
    }

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

        switch (event.key.keysym.sym)
        {
          case SDLK_TAB:
              value = Key::Tab;
              break;
          case SDLK_LALT:
              value = Key::LeftAlt;
              break;
          case SDLK_RALT:
              value = Key::RightAlt;
              break;
          case SDLK_LSHIFT:
              value = Key::LeftShift;
              break;
          case SDLK_RSHIFT:
              value = Key::RightShift;
              break;
          case SDLK_LCTRL:
              value = Key::LeftControl;
              break;
          case SDLK_RCTRL:
              value = Key::RightControl;
              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 up events in SDL.
              //if (event.type == SDL_KEYUP || event.key.keysym.unicode == ' ')
              if (event.type == SDL_KEYUP)
              {
                  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::PageUp;
              break;
          case SDLK_PRINTSCREEN:
              value = Key::PrintScreen;
              break;
          case SDLK_PAGEDOWN:
              value = Key::PageDown;
              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_NUMLOCKCLEAR:
              value = Key::NumLock;
              break;
          case SDLK_CAPSLOCK:
              value = Key::CapsLock;
              break;
          case SDLK_SCROLLLOCK:
              value = Key::ScrollLock;
              break;
          case SDLK_LGUI:
              value = Key::LeftSuper;
              break;
          case SDLK_RGUI:
              value = Key::RightSuper;
              break;
          case SDLK_MODE:
              value = Key::AltGr;
              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_KP_0:
                  value = Key::Insert;
                  break;
              case SDLK_KP_1:
                  value = Key::End;
                  break;
              case SDLK_KP_2:
                  value = Key::Down;
                  break;
              case SDLK_KP_3:
                  value = Key::PageDown;
                  break;
              case SDLK_KP_4:
                  value = Key::Left;
                  break;
              case SDLK_KP_5:
                  value = 0;
                  break;
              case SDLK_KP_6:
                  value = Key::Right;
                  break;
              case SDLK_KP_7:
                  value = Key::Home;
                  break;
              case SDLK_KP_8:
                  value = Key::Up;
                  break;
              case SDLK_KP_9:
                  value = Key::PageUp;
                  break;
              default:
                  break;
            }
        }

        return value;
    }
}
