/* ScummVM - Scumm Interpreter
 * Copyright (C) 2001  Ludvig Strigeus
 * Copyright (C) 2001-2004 The ScummVM project
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.

 * This program 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 General Public License for more details.

 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 *
 * $Header$
 *
 */

#include "backends/sdl/sdl-common.h"
#include "common/util.h"

// FIXME move joystick defines out and replace with confile file options
// we should really allow users to map any key to a joystick button
#define JOY_DEADZONE 3200
#define JOY_ANALOG
// #define JOY_INVERT_Y
#define JOY_XAXIS 0
#define JOY_YAXIS 1
// buttons
#define JOY_BUT_LMOUSE 0
#define JOY_BUT_RMOUSE 2
#define JOY_BUT_ESCAPE 3
#define JOY_BUT_PERIOD 1
#define JOY_BUT_SPACE 4
#define JOY_BUT_F5 5




static int mapKey(SDLKey key, SDLMod mod, Uint16 unicode)
{
	if (key >= SDLK_F1 && key <= SDLK_F9) {
		return key - SDLK_F1 + 315;
	} else if (key >= SDLK_KP0 && key <= SDLK_KP9) {
		return key - SDLK_KP0 + '0';
	} else if (key >= SDLK_UP && key <= SDLK_PAGEDOWN) {
		return key;
	} else if (unicode) {
		return unicode;
	} else if (key >= 'a' && key <= 'z' && mod & KMOD_SHIFT) {
		return key & ~0x20;
	} else if (key >= SDLK_NUMLOCK && key <= SDLK_EURO) {
		return 0;
	}
	return key;
}

void OSystem_SDL::fillMouseEvent(Event &event, int x, int y) {
	event.mouse.x = x;
	event.mouse.y = y;
	
	// Update the "keyboard mouse" coords
	_km.x = x;
	_km.y = y;

	// Adjust for the screen scaling
	event.mouse.x /= _scaleFactor;
	event.mouse.y /= _scaleFactor;

	// Optionally perform aspect ratio adjusting
	if (_adjustAspectRatio)
		event.mouse.y = aspect2Real(event.mouse.y);
}

void OSystem_SDL::handleKbdMouse() {
	uint32 curTime = getMillis();
	if (curTime >= _km.last_time + _km.delay_time) {
		_km.last_time = curTime;
		if (_km.x_down_count == 1) {
			_km.x_down_time = curTime;
			_km.x_down_count = 2;
		}
		if (_km.y_down_count == 1) {
			_km.y_down_time = curTime;
			_km.y_down_count = 2;
		}

		if (_km.x_vel || _km.y_vel) {
			if (_km.x_down_count) {
				if (curTime > _km.x_down_time + _km.delay_time * 12) {
					if (_km.x_vel > 0)
						_km.x_vel++;
					else
						_km.x_vel--;
				} else if (curTime > _km.x_down_time + _km.delay_time * 8) {
					if (_km.x_vel > 0)
						_km.x_vel = 5;
					else
						_km.x_vel = -5;
				}
			}
			if (_km.y_down_count) {
				if (curTime > _km.y_down_time + _km.delay_time * 12) {
					if (_km.y_vel > 0)
						_km.y_vel++;
					else
						_km.y_vel--;
				} else if (curTime > _km.y_down_time + _km.delay_time * 8) {
					if (_km.y_vel > 0)
						_km.y_vel = 5;
					else
						_km.y_vel = -5;
				}
			}

			_km.x += _km.x_vel;
			_km.y += _km.y_vel;

			if (_km.x < 0) {
				_km.x = 0;
				_km.x_vel = -1;
				_km.x_down_count = 1;
			} else if (_km.x > _km.x_max) {
				_km.x = _km.x_max;
				_km.x_vel = 1;
				_km.x_down_count = 1;
			}

			if (_km.y < 0) {
				_km.y = 0;
				_km.y_vel = -1;
				_km.y_down_count = 1;
			} else if (_km.y > _km.y_max) {
				_km.y = _km.y_max;
				_km.y_vel = 1;
				_km.y_down_count = 1;
			}

			SDL_WarpMouse(_km.x, _km.y);
		}
	}
}

static byte SDLModToOSystemKeyFlags(SDLMod mod) {
	byte b = 0;
#ifdef LINUPY
	// Yopy has no ALT key, steal the SHIFT key 
	// (which isn't used much anyway)
	if (mod & KMOD_SHIFT)
		b |= OSystem::KBD_ALT;
#else
	if (mod & KMOD_SHIFT)
		b |= OSystem::KBD_SHIFT;
	if (mod & KMOD_ALT)
		b |= OSystem::KBD_ALT;
#endif
	if (mod & KMOD_CTRL)
		b |= OSystem::KBD_CTRL;

	return b;
}

bool OSystem_SDL::pollEvent(Event &event) {
	SDL_Event ev;
	int axis;
	byte b = 0;
	
	handleKbdMouse();
	
	// If the screen mode changed, send an EVENT_SCREEN_CHANGED
	if (_modeChanged) {
		_modeChanged = false;
		event.type = EVENT_SCREEN_CHANGED;
		return true;
	}

	while(SDL_PollEvent(&ev)) {
		switch(ev.type) {
		case SDL_KEYDOWN:
			b = SDLModToOSystemKeyFlags(SDL_GetModState());
			event.kbd.flags = b;

			// Alt-Return and Alt-Enter toggle full screen mode				
			if (b == KBD_ALT && (ev.key.keysym.sym == SDLK_RETURN
			                  || ev.key.keysym.sym == SDLK_KP_ENTER)) {
				setFullscreenMode(!_fullscreen);
#ifdef USE_OSD
				if (_fullscreen)
					displayMessageOnOSD("Fullscreen mode");
				else
					displayMessageOnOSD("Windowed mode");
#endif

				break;
			}

			// Alt-S: Create a screenshot
			if (b == KBD_ALT && ev.key.keysym.sym == 's') {
				char filename[20];

				for (int n = 0;; n++) {
					SDL_RWops *file;

					sprintf(filename, "scummvm%05d.bmp", n);
					file = SDL_RWFromFile(filename, "r");
					if (!file)
						break;
					SDL_RWclose(file);
				}
				if (saveScreenshot(filename))
					printf("Saved '%s'\n", filename);
				else
					printf("Could not save screenshot!\n");
				break;
			}

			// Ctrl-m toggles mouse capture
			if (b == KBD_CTRL && ev.key.keysym.sym == 'm') {
				toggleMouseGrab();
				break;
			}

#ifdef MACOSX
			// On Macintosh', Cmd-Q quits
			if ((ev.key.keysym.mod & KMOD_META) && ev.key.keysym.sym == 'q') {
				event.type = EVENT_QUIT;
				return true;
			}
#elif defined(UNIX)
			// On other unices, Control-Q quits
			if ((ev.key.keysym.mod & KMOD_CTRL) && ev.key.keysym.sym == 'q') {
				event.type = EVENT_QUIT;
				return true;
			}
#else
			// Ctrl-z and Alt-X quit
			if ((b == KBD_CTRL && ev.key.keysym.sym == 'z') || (b == KBD_ALT && ev.key.keysym.sym == 'x')) {
				event.type = EVENT_QUIT;
				return true;
			}
#endif

			// Ctrl-Alt-<key> will change the GFX mode
			if ((b & (KBD_CTRL|KBD_ALT)) == (KBD_CTRL|KBD_ALT)) {
				
				// Ctrl-Alt-a toggles aspect ratio correction
				if (ev.key.keysym.sym == 'a') {
					setFeatureState(kFeatureAspectRatioCorrection, !_adjustAspectRatio);
#ifdef USE_OSD
					char buffer[128];
					if (_adjustAspectRatio)
						sprintf(buffer, "Enabled aspect ratio correction\n%d x %d -> %d x %d",
							_screenWidth, _screenHeight,
							_hwscreen->w, _hwscreen->h
							);
					else
						sprintf(buffer, "Disabled aspect ratio correction\n%d x %d -> %d x %d",
							_screenWidth, _screenHeight,
							_hwscreen->w, _hwscreen->h
							);
					displayMessageOnOSD(buffer);
#endif

					break;
				}


				int newMode = -1;
				int factor = _scaleFactor - 1;
				
				// Increase/decrease the scale factor
				if (ev.key.keysym.sym == SDLK_EQUALS || ev.key.keysym.sym == SDLK_PLUS || ev.key.keysym.sym == SDLK_MINUS ||
					ev.key.keysym.sym == SDLK_KP_PLUS || ev.key.keysym.sym == SDLK_KP_MINUS) {
					factor += (ev.key.keysym.sym == SDLK_MINUS || ev.key.keysym.sym == SDLK_KP_MINUS) ? -1 : +1;
					if (0 <= factor && factor <= 3) {
						newMode = s_gfxModeSwitchTable[_scalerType][factor];
					}
				}
				
				const bool isNormalNumber = (SDLK_1 <= ev.key.keysym.sym && ev.key.keysym.sym <= SDLK_9);
				const bool isKeypadNumber = (SDLK_KP1 <= ev.key.keysym.sym && ev.key.keysym.sym <= SDLK_KP9);
				if (isNormalNumber || isKeypadNumber) {
					_scalerType = ev.key.keysym.sym - (isNormalNumber ? SDLK_1 : SDLK_KP1);
					if (_scalerType >= ARRAYSIZE(s_gfxModeSwitchTable))
						break;
					
					while (s_gfxModeSwitchTable[_scalerType][factor] < 0) {
						assert(factor > 0);
						factor--;
					}
					newMode = s_gfxModeSwitchTable[_scalerType][factor];
				}
				
				if (newMode >= 0) {
					setGraphicsMode(newMode);
#ifdef USE_OSD
					if (_osdSurface) {
						const char *newScalerName = 0;
						const GraphicsMode *g = getSupportedGraphicsModes();
						while (g->name) {
							if (g->id == _mode) {
								newScalerName = g->description;
								break;
							}
							g++;
						}
						if (newScalerName) {
							char buffer[128];
							sprintf(buffer, "Active graphics filter: %s\n%d x %d -> %d x %d",
								newScalerName,
								_screenWidth, _screenHeight,
								_hwscreen->w, _hwscreen->h
								);
							displayMessageOnOSD(buffer);
						}
					}
#endif

				}
				break;
			}

#ifdef LINUPY
			// On Yopy map the End button to quit
			if ((ev.key.keysym.sym == 293)) {
				event.type = EVENT_QUIT;
				return true;
			}
			// Map menu key to f5 (scumm menu)
			if (ev.key.keysym.sym == 306) {
				event.type = EVENT_KEYDOWN;
				event.kbd.keycode = SDLK_F5;
				event.kbd.ascii = mapKey(SDLK_F5, ev.key.keysym.mod, 0);
				return true;
			}
			// Map action key to action
			if (ev.key.keysym.sym == 291) {
				event.type = EVENT_KEYDOWN;
				event.kbd.keycode = SDLK_TAB;
				event.kbd.ascii = mapKey(SDLK_TAB, ev.key.keysym.mod, 0);
				return true;
			}
			// Map OK key to skip cinematic
			if (ev.key.keysym.sym == 292) {
				event.type = EVENT_KEYDOWN;
				event.kbd.keycode = SDLK_ESCAPE;
				event.kbd.ascii = mapKey(SDLK_ESCAPE, ev.key.keysym.mod, 0);
				return true;
			}
#endif

#ifdef QTOPIA
			// quit on fn+backspace on zaurus
			if (ev.key.keysym.sym == 127) {
				event.type = EVENT_QUIT;
				return true;
			}

			// map menu key (f11) to f5 (scumm menu)
			if (ev.key.keysym.sym == SDLK_F11) {
				event.type = EVENT_KEYDOWN;
				event.kbd.keycode = SDLK_F5;
				event.kbd.ascii = mapKey(SDLK_F5, ev.key.keysym.mod, 0);
			}
			// map center (space) to tab (default action )
			// I wanted to map the calendar button but the calendar comes up
			//
			else if (ev.key.keysym.sym == SDLK_SPACE) {
				event.type = EVENT_KEYDOWN;
				event.kbd.keycode = SDLK_TAB;
				event.kbd.ascii = mapKey(SDLK_TAB, ev.key.keysym.mod, 0);
			}
			// since we stole space (pause) above we'll rebind it to the tab key on the keyboard
			else if (ev.key.keysym.sym == SDLK_TAB) {
				event.type = EVENT_KEYDOWN;
				event.kbd.keycode = SDLK_SPACE;
				event.kbd.ascii = mapKey(SDLK_SPACE, ev.key.keysym.mod, 0);
			} else {
			// let the events fall through if we didn't change them, this may not be the best way to
			// set it up, but i'm not sure how sdl would like it if we let if fall through then redid it though.
			// and yes i have an huge terminal size so i dont wrap soon enough.
				event.type = EVENT_KEYDOWN;
				event.kbd.keycode = ev.key.keysym.sym;
				event.kbd.ascii = mapKey(ev.key.keysym.sym, ev.key.keysym.mod, ev.key.keysym.unicode);
			}
#else
			event.type = EVENT_KEYDOWN;
			event.kbd.keycode = ev.key.keysym.sym;
			event.kbd.ascii = mapKey(ev.key.keysym.sym, ev.key.keysym.mod, ev.key.keysym.unicode);
#endif

/* Disabled mouse emulation code (fingolfin, 2004-12-18).
   I am keeping the rest of the code in for now, since the joystick
   code (or rather, "hack") uses it, too.
			switch(ev.key.keysym.sym) {
			case SDLK_LEFT:
				_km.x_vel = -1;
				_km.x_down_count = 1;
				break;
			case SDLK_RIGHT:
				_km.x_vel =  1;
				_km.x_down_count = 1;
				break;
			case SDLK_UP:
				_km.y_vel = -1;
				_km.y_down_count = 1;
				break;
			case SDLK_DOWN:
				_km.y_vel =  1;
				_km.y_down_count = 1;
				break;
			default:
				break;
			}
*/
			return true;
	
		case SDL_KEYUP:
			event.type = EVENT_KEYUP;
			event.kbd.keycode = ev.key.keysym.sym;
			event.kbd.ascii = mapKey(ev.key.keysym.sym, ev.key.keysym.mod, ev.key.keysym.unicode);
			event.kbd.flags = SDLModToOSystemKeyFlags(SDL_GetModState());;

/*
			switch(ev.key.keysym.sym) {
			case SDLK_LEFT:
				if (_km.x_vel < 0) {
					_km.x_vel = 0;
					_km.x_down_count = 0;
				}
				break;
			case SDLK_RIGHT:
				if (_km.x_vel > 0) {
					_km.x_vel = 0;
					_km.x_down_count = 0;
				}
				break;
			case SDLK_UP:
				if (_km.y_vel < 0) {
					_km.y_vel = 0;
					_km.y_down_count = 0;
				}
				break;
			case SDLK_DOWN:
				if (_km.y_vel > 0) {
					_km.y_vel = 0;
					_km.y_down_count = 0;
				}
				break;
			default:
				break;
			}
*/
			return true;

		case SDL_MOUSEMOTION:
			event.type = EVENT_MOUSEMOVE;
			fillMouseEvent(event, ev.motion.x, ev.motion.y);
			
			setMousePos(event.mouse.x, event.mouse.y);
			return true;

		case SDL_MOUSEBUTTONDOWN:
			if (ev.button.button == SDL_BUTTON_LEFT)
				event.type = EVENT_LBUTTONDOWN;
			else if (ev.button.button == SDL_BUTTON_RIGHT)
				event.type = EVENT_RBUTTONDOWN;
#if defined(SDL_BUTTON_WHEELUP) && defined(SDL_BUTTON_WHEELDOWN)
			else if (ev.button.button == SDL_BUTTON_WHEELUP)
				event.type = EVENT_WHEELUP;
			else if (ev.button.button == SDL_BUTTON_WHEELDOWN)
				event.type = EVENT_WHEELDOWN;
#endif
			else
				break;

			fillMouseEvent(event, ev.button.x, ev.button.y);

			return true;

		case SDL_MOUSEBUTTONUP:
			if (ev.button.button == SDL_BUTTON_LEFT)
				event.type = EVENT_LBUTTONUP;
			else if (ev.button.button == SDL_BUTTON_RIGHT)
				event.type = EVENT_RBUTTONUP;
			else
				break;
			fillMouseEvent(event, ev.button.x, ev.button.y);

			return true;

		case SDL_JOYBUTTONDOWN:
			if (ev.jbutton.button == JOY_BUT_LMOUSE) {
				event.type = EVENT_LBUTTONDOWN;
			} else if (ev.jbutton.button == JOY_BUT_RMOUSE) {
				event.type = EVENT_RBUTTONDOWN;
			} else {
				event.type = EVENT_KEYDOWN;
				switch (ev.jbutton.button) {
					case JOY_BUT_ESCAPE:
						event.kbd.keycode = SDLK_ESCAPE;
						event.kbd.ascii = mapKey(SDLK_ESCAPE, ev.key.keysym.mod, 0);
						break;
					case JOY_BUT_PERIOD:
						event.kbd.keycode = SDLK_PERIOD;
						event.kbd.ascii = mapKey(SDLK_PERIOD, ev.key.keysym.mod, 0);
						break;
					case JOY_BUT_SPACE:
						event.kbd.keycode = SDLK_SPACE;
						event.kbd.ascii = mapKey(SDLK_SPACE, ev.key.keysym.mod, 0);
						break;
					case JOY_BUT_F5:
						event.kbd.keycode = SDLK_F5;
						event.kbd.ascii = mapKey(SDLK_F5, ev.key.keysym.mod, 0);
						break; 
				}
			}
			return true;

		case SDL_JOYBUTTONUP:
			if (ev.jbutton.button == JOY_BUT_LMOUSE) {
				event.type = EVENT_LBUTTONUP;
			} else if (ev.jbutton.button == JOY_BUT_RMOUSE) {
				event.type = EVENT_RBUTTONUP;
			} else {
				event.type = EVENT_KEYUP;
				switch (ev.jbutton.button) {
					case JOY_BUT_ESCAPE:
						event.kbd.keycode = SDLK_ESCAPE;
						event.kbd.ascii = mapKey(SDLK_ESCAPE, ev.key.keysym.mod, 0);
						break;
					case JOY_BUT_PERIOD:
						event.kbd.keycode = SDLK_PERIOD;
						event.kbd.ascii = mapKey(SDLK_PERIOD, ev.key.keysym.mod, 0);
						break;
					case JOY_BUT_SPACE:
						event.kbd.keycode = SDLK_SPACE;
						event.kbd.ascii = mapKey(SDLK_SPACE, ev.key.keysym.mod, 0);
						break;
					case JOY_BUT_F5:
						event.kbd.keycode = SDLK_F5;
						event.kbd.ascii = mapKey(SDLK_F5, ev.key.keysym.mod, 0);
						break;
				} 
			}
			return true;

		case SDL_JOYAXISMOTION:
			axis = ev.jaxis.value;
			if ( axis > JOY_DEADZONE) {
				axis -= JOY_DEADZONE;
				event.type = EVENT_MOUSEMOVE;
			} else if ( axis < -JOY_DEADZONE ) {
				axis += JOY_DEADZONE;
				event.type = EVENT_MOUSEMOVE;
			} else
				axis = 0;

			if ( ev.jaxis.axis == JOY_XAXIS) { 
#ifdef JOY_ANALOG
				_km.x_vel = axis/2000;
				_km.x_down_count = 0;
#else
				if (axis != 0) {
					_km.x_vel = (axis > 0) ? 1:-1;
					_km.x_down_count = 1;
				} else {
					_km.x_vel = 0;
					_km.x_down_count = 0;
				}
#endif

			} else if (ev.jaxis.axis == JOY_YAXIS) { 
#ifndef JOY_INVERT_Y
				axis = -axis;
#endif
#ifdef JOY_ANALOG
				_km.y_vel = -axis / 2000;
				_km.y_down_count = 0;
#else
				if (axis != 0) {
					_km.y_vel = (-axis > 0) ? 1: -1;
					_km.y_down_count = 1;
				} else {
					_km.y_vel = 0;
					_km.y_down_count = 0;
				}
#endif
			}
			
			fillMouseEvent(event, _km.x, _km.y);

			return true;

		case SDL_VIDEOEXPOSE:
			_forceFull = true;
			break;

		case SDL_QUIT:
			event.type = EVENT_QUIT;
			return true;
		}
	}
	return false;
}