/*

    SDL - Simple DirectMedia Layer

    Copyright (C) 1997-2006 Sam Lantinga

    This library 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 St, Fifth Floor, Boston, MA  02110-1301  USA

    Sam Lantinga

    slouken@libsdl.org

*/

#include "SDL_config.h"

/*

 * GEM SDL video driver implementation

 * inspired from the Dummy SDL driver

 * 

 * Patrice Mandin

 * and work from

 * Olivier Landemarre, Johan Klockars, Xavier Joubert, Claude Attard

 */

#include <gem.h>

#include "../../events/SDL_sysevents.h"

#include "../../events/SDL_events_c.h"

#include "SDL_gemvideo.h"

#include "SDL_gemevents_c.h"

#include "../ataricommon/SDL_atarikeys.h"	/* for keyboard scancodes */

#include "../ataricommon/SDL_atarievents_c.h"

#include "../ataricommon/SDL_xbiosevents_c.h"

#include "../ataricommon/SDL_ataridevmouse_c.h"

/* Variables */

static unsigned char gem_currentkeyboard[ATARIBIOS_MAXKEYS];

static unsigned char gem_previouskeyboard[ATARIBIOS_MAXKEYS];

/* Functions prototypes */

static int do_messages(_THIS, short *message);

static void do_keyboard(short kc, short ks);

static void do_mouse(_THIS, short mx, short my, short mb, short ks);

/* Functions */

void GEM_InitOSKeymap(_THIS)

{

	SDL_memset(gem_currentkeyboard, 0, sizeof(gem_currentkeyboard));

	SDL_memset(gem_previouskeyboard, 0, sizeof(gem_previouskeyboard));

	/* Mouse init */

	GEM_mouse_relative = SDL_FALSE;

	SDL_Atari_InitInternalKeymap(this);

}

void GEM_PumpEvents(_THIS)

{

	short mousex, mousey, mouseb, dummy;

	short kstate, prevkc, prevks;

	int i;

	SDL_keysym	keysym;

	SDL_memset(gem_currentkeyboard,0,sizeof(gem_currentkeyboard));

	prevkc = prevks = 0;

	for (;;)

	{

		int quit, resultat, event_mask, mouse_event;

		short buffer[8], kc;

		short x2,y2,w2,h2;

		quit =

			mouse_event =

			x2=y2=w2=h2 = 0;

		event_mask = MU_MESAG|MU_TIMER|MU_KEYBD;

		if (!GEM_fullscreen && (GEM_handle>=0)) {

			wind_get (GEM_handle, WF_WORKXYWH, &x2, &y2, &w2, &h2);

			event_mask |= MU_M1;

			mouse_event = ( (SDL_GetAppState() & SDL_APPMOUSEFOCUS)

				== SDL_APPMOUSEFOCUS) ? MO_LEAVE : MO_ENTER;

		}

		resultat = evnt_multi(

			event_mask,

			0,0,0,

			mouse_event,x2,y2,w2,h2,

			0,0,0,0,0,

			buffer,

			10,

			&dummy,&dummy,&dummy,&kstate,&kc,&dummy

		);

		/* Message event ? */

		if (resultat & MU_MESAG)

			quit = do_messages(this, buffer);

		/* Keyboard event ? */

		if (resultat & MU_KEYBD) {

			if ((prevkc != kc) || (prevks != kstate)) {

				do_keyboard(kc,kstate);

			} else {

				/* Avoid looping, if repeating same key */

				break;

			}

		}

		/* Mouse entering/leaving window */

		if (resultat & MU_M1) {

			if (this->input_grab == SDL_GRAB_OFF) {

				/* Switch mouse focus state */

				SDL_PrivateAppActive((mouse_event == MO_ENTER),

					SDL_APPMOUSEFOCUS);

			}

			GEM_CheckMouseMode(this);

		}

		/* Timer event ? */

		if ((resultat & MU_TIMER) || quit)

			break;

	}

	/* Update mouse */

	graf_mkstate(&mousex, &mousey, &mouseb, &kstate);

	do_mouse(this, mousex, mousey, mouseb, kstate);

	/* Now generate keyboard events */

	for (i=0; i<ATARIBIOS_MAXKEYS; i++) {

		/* Key pressed ? */

		if (gem_currentkeyboard[i] && !gem_previouskeyboard[i])

			SDL_PrivateKeyboard(SDL_PRESSED,

				SDL_Atari_TranslateKey(i, &keysym, SDL_TRUE));

		/* Key unpressed ? */

		if (gem_previouskeyboard[i] && !gem_currentkeyboard[i])

			SDL_PrivateKeyboard(SDL_RELEASED,

				SDL_Atari_TranslateKey(i, &keysym, SDL_FALSE));

	}

	SDL_memcpy(gem_previouskeyboard,gem_currentkeyboard,sizeof(gem_previouskeyboard));

	/* Refresh window name ? */

	if (GEM_refresh_name) {

		const char *window_name =

			(SDL_GetAppState() & SDL_APPACTIVE)

			? GEM_title_name : GEM_icon_name;

		if (window_name) {

			wind_set(GEM_handle,WF_NAME,

				(short)(((unsigned long)window_name)>>16),

				(short)(((unsigned long)window_name) & 0xffff),

				0,0);

		}

		GEM_refresh_name = SDL_FALSE;

	}

}

static int do_messages(_THIS, short *message)

{

	int quit, posted, check_mouse_mode;

	short x2,y2,w2,h2;

	quit = check_mouse_mode = 0;

	switch (message[0]) {

		case WM_CLOSED:

		case AP_TERM:    

			posted = SDL_PrivateQuit();

			quit=1;

			break;

		case WM_MOVED:

			wind_set(message[3],WF_CURRXYWH,message[4],message[5],message[6],message[7]);

			break;

		case WM_TOPPED:

			wind_set(message[3],WF_TOP,message[4],0,0,0);

			/* Continue with TOP event processing */

		case WM_ONTOP:

			SDL_PrivateAppActive(1, SDL_APPINPUTFOCUS);

			if (VDI_setpalette) {

				VDI_setpalette(this, VDI_curpalette);

			}

			check_mouse_mode = 1;

			break;

		case WM_REDRAW:

			if (!GEM_lock_redraw) {

				GEM_wind_redraw(this, message[3],&message[4]);

			}

			break;

		case WM_ICONIFY:

		case WM_ALLICONIFY:

			wind_set(message[3],WF_ICONIFY,message[4],message[5],message[6],message[7]);

			/* If we're active, make ourselves inactive */

			if ( SDL_GetAppState() & SDL_APPACTIVE ) {

				/* Send an internal deactivate event */

				SDL_PrivateAppActive(0, SDL_APPACTIVE);

			}

			/* Update window title */

			if (GEM_refresh_name && GEM_icon_name) {

				wind_set(GEM_handle,WF_NAME,(short)(((unsigned long)GEM_icon_name)>>16),(short)(((unsigned long)GEM_icon_name) & 0xffff),0,0);

				GEM_refresh_name = SDL_FALSE;

			}

			check_mouse_mode = 1;

			break;

		case WM_UNICONIFY:

			wind_set(message[3],WF_UNICONIFY,message[4],message[5],message[6],message[7]);

			/* If we're not active, make ourselves active */

			if ( !(SDL_GetAppState() & SDL_APPACTIVE) ) {

				/* Send an internal activate event */

				SDL_PrivateAppActive(1, SDL_APPACTIVE);

			}

			if (GEM_refresh_name && GEM_title_name) {

				wind_set(GEM_handle,WF_NAME,(short)(((unsigned long)GEM_title_name)>>16),(short)(((unsigned long)GEM_title_name) & 0xffff),0,0);

				GEM_refresh_name = SDL_FALSE;

			}

			check_mouse_mode = 1;

			break;

		case WM_SIZED:

			wind_set (message[3], WF_CURRXYWH, message[4], message[5], message[6], message[7]);

			wind_get (message[3], WF_WORKXYWH, &x2, &y2, &w2, &h2);

			GEM_win_fulled = SDL_FALSE;		/* Cancel maximized flag */

			GEM_lock_redraw = SDL_TRUE;		/* Prevent redraw till buffers resized */

			SDL_PrivateResize(w2, h2);

			break;

		case WM_FULLED:

			{

				short x,y,w,h;

				if (GEM_win_fulled) {

					wind_get (message[3], WF_PREVXYWH, &x, &y, &w, &h);

					GEM_win_fulled = SDL_FALSE;

				} else {

					x = GEM_desk_x;

					y = GEM_desk_y;

					w = GEM_desk_w;

					h = GEM_desk_h;

					GEM_win_fulled = SDL_TRUE;

				}

				wind_set (message[3], WF_CURRXYWH, x, y, w, h);

				wind_get (message[3], WF_WORKXYWH, &x2, &y2, &w2, &h2);

				GEM_lock_redraw = SDL_TRUE;		/* Prevent redraw till buffers resized */

				SDL_PrivateResize(w2, h2);

			}

			break;

		case WM_BOTTOMED:

			wind_set(message[3],WF_BOTTOM,0,0,0,0);

			/* Continue with BOTTOM event processing */

		case WM_UNTOPPED:

			SDL_PrivateAppActive(0, SDL_APPINPUTFOCUS);

			if (VDI_setpalette) {

				VDI_setpalette(this, VDI_oldpalette);

			}

			check_mouse_mode = 1;

			break;

	}

	if (check_mouse_mode) {

		GEM_CheckMouseMode(this);

	}

	return quit;

}

static void do_keyboard(short kc, short ks)

{

	int scancode;

	if (kc) {

		scancode=(kc>>8) & (ATARIBIOS_MAXKEYS-1);

		gem_currentkeyboard[scancode]=0xFF;

	}

	/* Read special keys */

	if (ks & K_RSHIFT)

		gem_currentkeyboard[SCANCODE_RIGHTSHIFT]=0xFF;

	if (ks & K_LSHIFT)

		gem_currentkeyboard[SCANCODE_LEFTSHIFT]=0xFF;

	if (ks & K_CTRL)

		gem_currentkeyboard[SCANCODE_LEFTCONTROL]=0xFF;

	if (ks & K_ALT)

		gem_currentkeyboard[SCANCODE_LEFTALT]=0xFF;

}

static void do_mouse(_THIS, short mx, short my, short mb, short ks)

{

	static short prevmousex=0, prevmousey=0, prevmouseb=0;

	short x2, y2, w2, h2;

	/* Don't return mouse events if out of window */

	if ((SDL_GetAppState() & SDL_APPMOUSEFOCUS)==0) {

		return;

	}

	/* Retrieve window coords, and generate mouse events accordingly */

	x2 = y2 = 0;

	w2 = VDI_w;

	h2 = VDI_h;

	if ((!GEM_fullscreen) && (GEM_handle>=0)) {

		wind_get (GEM_handle, WF_WORKXYWH, &x2, &y2, &w2, &h2);

		/* Do not generate mouse button event if out of window working area */

		if ((mx<x2) || (mx>=x2+w2) || (my<y2) || (my>=y2+h2)) {

			mb=prevmouseb;

		}

	}

	/* Mouse motion ? */

	if (GEM_mouse_relative) {

		if (GEM_usedevmouse) {

			SDL_AtariDevMouse_PostMouseEvents(this, SDL_FALSE);

		} else {

			SDL_AtariXbios_PostMouseEvents(this, SDL_FALSE);

		}

	} else {

		if ((prevmousex!=mx) || (prevmousey!=my)) {

			int posx, posy;

			/* Give mouse position relative to window position */

			posx = mx - x2;

			if (posx<0) posx = 0;

			if (posx>w2) posx = w2-1;

			posy = my - y2;

			if (posy<0) posy = 0;

			if (posy>h2) posy = h2-1;

			SDL_PrivateMouseMotion(0, 0, posx, posy);

		}

		prevmousex = mx;

		prevmousey = my;

	}

	/* Mouse button ? */

	if (prevmouseb!=mb) {

		int i;

		for (i=0;i<2;i++) {

			int curbutton, prevbutton;

			curbutton = mb & (1<<i);

			prevbutton = prevmouseb & (1<<i);

			if (curbutton && !prevbutton) {

				SDL_PrivateMouseButton(SDL_PRESSED, i+1, 0, 0);

			}

			if (!curbutton && prevbutton) {

				SDL_PrivateMouseButton(SDL_RELEASED, i+1, 0, 0);

			}

		}

		prevmouseb = mb;

	}

	/* Read special keys */

	if (ks & K_RSHIFT)

		gem_currentkeyboard[SCANCODE_RIGHTSHIFT]=0xFF;

	if (ks & K_LSHIFT)

		gem_currentkeyboard[SCANCODE_LEFTSHIFT]=0xFF;

	if (ks & K_CTRL)

		gem_currentkeyboard[SCANCODE_LEFTCONTROL]=0xFF;

	if (ks & K_ALT)

		gem_currentkeyboard[SCANCODE_LEFTALT]=0xFF;

}