/*
Copyright (C) 1997-2001 Id Software, Inc.

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.

*/
// Main windowed and fullscreen graphics interface module. This module
// is used for both the software and OpenGL rendering versions of the
// Quake refresh engine.

#include <assert.h>
#include <dlfcn.h> // ELF dl loader
#include <sys/stat.h>
#include <unistd.h>
#include <errno.h>

#ifndef RTLD_NOW
#define RTLD_NOW RTLD_LAZY
#endif

#ifndef RTLD_GLOBAL
#define RTLD_GLOBAL 0
#endif

#ifdef __OpenBSD__
#define dlsym(X, Y) dlsym(X, "_"##Y)
#endif

#include "../client/client.h"

#include "../linux/rw_linux.h"

// Structure containing functions exported from refresh DLL
refexport_t	re;

// Console variables that we need to access from this module
cvar_t		*vid_gamma;
cvar_t		*vid_ref;			// Name of Refresh DLL loaded
cvar_t		*vid_xpos;			// X coordinate of window position
cvar_t		*vid_ypos;			// Y coordinate of window position
cvar_t		*vid_fullscreen;

// Global variables used internally by this module
viddef_t	viddef;				// global video state; used by other modules
void		*reflib_library;		// Handle to refresh DLL 
qboolean	reflib_active = 0;

#define VID_NUM_MODES ( sizeof( vid_modes ) / sizeof( vid_modes[0] ) )

/** KEYBOARD **************************************************************/

void Do_Key_Event(int key, qboolean down);

void (*KBD_Update_fp)(void);
void (*KBD_Init_fp)(Key_Event_fp_t fp);
void (*KBD_Close_fp)(void);

/** MOUSE *****************************************************************/

in_state_t in_state;

void (*RW_IN_Init_fp)(in_state_t *in_state_p);
void (*RW_IN_Shutdown_fp)(void);
void (*RW_IN_Activate_fp)(qboolean active);
void (*RW_IN_Commands_fp)(void);
void (*RW_IN_Move_fp)(usercmd_t *cmd);
void (*RW_IN_Frame_fp)(void);

void Real_IN_Init (void);

/*
==========================================================================

DLL GLUE

==========================================================================
*/

#define	MAXPRINTMSG	4096
void VID_Printf (int print_level, char *fmt, ...)
{
	va_list		argptr;
	char		msg[MAXPRINTMSG];
	static qboolean	inupdate;
	
	va_start (argptr,fmt);
	vsnprintf (msg,MAXPRINTMSG,fmt,argptr);
	va_end (argptr);

	if (print_level == PRINT_ALL)
		Com_Printf ("%s", msg);
	else
		Com_DPrintf ("%s", msg);
}

void VID_Error (int err_level, char *fmt, ...)
{
	va_list		argptr;
	char		msg[MAXPRINTMSG];
	static qboolean	inupdate;
	
	va_start (argptr,fmt);
	vsnprintf (msg,MAXPRINTMSG,fmt,argptr);
	va_end (argptr);

	Com_Error (err_level,"%s", msg);
}

//==========================================================================

/*
============
VID_Restart_f

Console command to re-start the video mode and refresh DLL. We do this
simply by setting the modified flag for the vid_ref variable, which will
cause the entire video mode and refresh DLL to be reset on the next frame.
============
*/
void VID_Restart_f (void)
{
	vid_ref->modified = true;
}

/*
** VID_GetModeInfo
*/
typedef struct vidmode_s
{
	const char *description;
	int         width, height;
	int         mode;
} vidmode_t;

vidmode_t vid_modes[] =
{
	{ "Mode 0: 320x240",   320, 240,   0 },
	{ "Mode 1: 400x300",   400, 300,   1 },
	{ "Mode 2: 512x384",   512, 384,   2 },
	{ "Mode 3: 640x480",   640, 480,   3 },
	{ "Mode 4: 800x600",   800, 600,   4 },
	{ "Mode 5: 960x720",   960, 720,   5 },
	{ "Mode 6: 1024x768",  1024, 768,  6 },
	{ "Mode 7: 1152x864",  1152, 864,  7 },
	{ "Mode 8: 1280x1024",  1280, 1024, 8 },
	{ "Mode 9: 1600x1200", 1600, 1200, 9 },
	{ "Mode 10: 2048x1536", 2048, 1536, 10 }
};

qboolean VID_GetModeInfo( int *width, int *height, int mode )
{
	if ( mode < 0 || mode >= VID_NUM_MODES )
		return false;

	*width  = vid_modes[mode].width;
	*height = vid_modes[mode].height;

	return true;
}

/*
** VID_NewWindow
*/
void VID_NewWindow ( int width, int height)
{
	viddef.width  = width;
	viddef.height = height;
}

void VID_FreeReflib (void)
{
	if (reflib_library) {
		if (KBD_Close_fp)
			KBD_Close_fp();
		if (RW_IN_Shutdown_fp)
			RW_IN_Shutdown_fp();
		dlclose(reflib_library);
	}

	KBD_Init_fp = NULL;
	KBD_Update_fp = NULL;
	KBD_Close_fp = NULL;
	RW_IN_Init_fp = NULL;
	RW_IN_Shutdown_fp = NULL;
	RW_IN_Activate_fp = NULL;
	RW_IN_Commands_fp = NULL;
	RW_IN_Move_fp = NULL;
	RW_IN_Frame_fp = NULL;

	memset (&re, 0, sizeof(re));
	reflib_library = NULL;
	reflib_active  = false;
}

/*
==============
VID_LoadRefresh
==============
*/
qboolean VID_LoadRefresh( char *name )
{
	refimport_t	ri;
	GetRefAPI_t	GetRefAPI;
	char	fn[MAX_OSPATH];
	char	*path;
	struct stat st;
	extern uid_t saved_euid;
	FILE *fp;
	
	if ( reflib_active )
	{
		if (KBD_Close_fp)
			KBD_Close_fp();
		if (RW_IN_Shutdown_fp)
			RW_IN_Shutdown_fp();
		KBD_Close_fp = NULL;
		RW_IN_Shutdown_fp = NULL;
		re.Shutdown();
		VID_FreeReflib ();
	}

	Com_Printf( "------- Loading %s -------\n", name );

	//regain root
	seteuid(saved_euid);

#if 0
	if ((fp = fopen(so_file, "r")) == NULL) {
		Com_Printf( "LoadLibrary(\"%s\") failed: can't open %s (required for location of ref libraries)\n", name, so_file);
		return false;
	}
	fgets(fn, sizeof(fn), fp);
	fclose(fp);
	while (*fn && isspace(fn[strlen(fn) - 1]))
		fn[strlen(fn) - 1] = 0;

	strcat(fn, "/");
	strcat(fn, name);
#endif

	path = Cvar_Get ("basedir", ".", CVAR_NOSET)->string;

	snprintf (fn, MAX_OSPATH, "%s/%s", path, name );
	
	if (stat(fn, &st) == -1) {
		Com_Printf( "LoadLibrary(\"%s\") failed: %s\n", name, strerror(errno));
		return false;
	}
	
	// permission checking
	if (strstr(fn, "softx") == NULL &&
	    strstr(fn, "glx") == NULL &&
	    strstr(fn, "softsdl") == NULL &&
	    strstr(fn, "sdlgl") == NULL) { // softx doesn't require root	
#if 0
		if (st.st_uid != 0) {
			Com_Printf( "LoadLibrary(\"%s\") failed: ref is not owned by root\n", name);
			return false;
		}
		if ((st.st_mode & 0777) & ~0700) {
			Com_Printf( "LoadLibrary(\"%s\") failed: invalid permissions, must be 700 for security considerations\n", name);
			return false;
		}
#endif
	} else {
		// softx requires we give up root now
		seteuid(getuid());
		setegid(getgid());
	}

	if ( ( reflib_library = dlopen( fn, RTLD_LAZY | RTLD_GLOBAL ) ) == 0 )
	{
		Com_Printf( "LoadLibrary(\"%s\") failed: %s\n", name , dlerror());
		return false;
	}

  Com_Printf( "LoadLibrary(\"%s\")\n", fn );

	ri.Cmd_AddCommand = Cmd_AddCommand;
	ri.Cmd_RemoveCommand = Cmd_RemoveCommand;
	ri.Cmd_Argc = Cmd_Argc;
	ri.Cmd_Argv = Cmd_Argv;
	ri.Cmd_ExecuteText = Cbuf_ExecuteText;
	ri.Con_Printf = VID_Printf;
	ri.Sys_Error = VID_Error;
	ri.FS_LoadFile = FS_LoadFile;
	ri.FS_FreeFile = FS_FreeFile;
	ri.FS_Gamedir = FS_Gamedir;
	ri.Cvar_Get = Cvar_Get;
	ri.Cvar_Set = Cvar_Set;
	ri.Cvar_SetValue = Cvar_SetValue;
	ri.Vid_GetModeInfo = VID_GetModeInfo;
	ri.Vid_MenuInit = VID_MenuInit;
	ri.Vid_NewWindow = VID_NewWindow;

	if ( ( GetRefAPI = (void *) dlsym( reflib_library, "GetRefAPI" ) ) == 0 )
		Com_Error( ERR_FATAL, "dlsym failed on %s", name );

	re = GetRefAPI( ri );

	if (re.api_version != API_VERSION)
	{
		VID_FreeReflib ();
		Com_Error (ERR_FATAL, "%s has incompatible api_version", name);
	}

	/* Init IN (Mouse) */
	in_state.IN_CenterView_fp = IN_CenterView;
	in_state.Key_Event_fp = Do_Key_Event;
	in_state.viewangles = cl.viewangles;
	in_state.in_strafe_state = &in_strafe.state;

	if ((RW_IN_Init_fp = dlsym(reflib_library, "RW_IN_Init")) == NULL ||
		(RW_IN_Shutdown_fp = dlsym(reflib_library, "RW_IN_Shutdown")) == NULL ||
		(RW_IN_Activate_fp = dlsym(reflib_library, "RW_IN_Activate")) == NULL ||
		(RW_IN_Commands_fp = dlsym(reflib_library, "RW_IN_Commands")) == NULL ||
		(RW_IN_Move_fp = dlsym(reflib_library, "RW_IN_Move")) == NULL ||
		(RW_IN_Frame_fp = dlsym(reflib_library, "RW_IN_Frame")) == NULL)
		Sys_Error("No RW_IN functions in REF.\n");

	Real_IN_Init();

	if ( re.Init( 0, 0 ) == -1 )
	{
		re.Shutdown();
		VID_FreeReflib ();
		return false;
	}

	/* Init KBD */
#if 1
	if ((KBD_Init_fp = dlsym(reflib_library, "KBD_Init")) == NULL ||
		(KBD_Update_fp = dlsym(reflib_library, "KBD_Update")) == NULL ||
		(KBD_Close_fp = dlsym(reflib_library, "KBD_Close")) == NULL)
		Sys_Error("No KBD functions in REF.\n");
#else
	{
		void KBD_Init(void);
		void KBD_Update(void);
		void KBD_Close(void);

		KBD_Init_fp = KBD_Init;
		KBD_Update_fp = KBD_Update;
		KBD_Close_fp = KBD_Close;
	}
#endif
	KBD_Init_fp(Do_Key_Event);

	Key_ClearStates();
	
	// give up root now
	seteuid(getuid());
	setegid(getgid());

	Com_Printf( "------------------------------------\n");
	reflib_active = true;
	return true;
}

/*
============
VID_CheckChanges

This function gets called once just before drawing each frame, and it's sole purpose in life
is to check to see if any of the video mode parameters have changed, and if they have to 
update the rendering DLL and/or video mode to match.
============
*/
void VID_CheckChanges (void)
{
	char name[100];
	cvar_t *sw_mode;

	if ( vid_ref->modified )
	{
		S_StopAllSounds();
	}

	while (vid_ref->modified)
	{
		/*
		** refresh has changed
		*/
		vid_ref->modified = false;
		vid_fullscreen->modified = true;
		cl.refresh_prepped = false;
		cls.disable_screen = true;

		sprintf( name, "ref_%s.so", vid_ref->string );
		if ( !VID_LoadRefresh( name ) )
		{
			if ( strcmp (vid_ref->string, "soft") == 0 ||
				strcmp (vid_ref->string, "softx") == 0 ) {
Com_Printf("Refresh failed\n");
				sw_mode = Cvar_Get( "sw_mode", "0", 0 );
				if (sw_mode->value != 0) {
Com_Printf("Trying mode 0\n");
					Cvar_SetValue("sw_mode", 0);
					if ( !VID_LoadRefresh( name ) )
						Com_Error (ERR_FATAL, "Couldn't fall back to software refresh!");
				} else
					Com_Error (ERR_FATAL, "Couldn't fall back to software refresh!");
			}

			/* prefer to fall back on X if active */
			if (getenv("DISPLAY"))
				Cvar_Set( "vid_ref", "softx" );
			else
				Cvar_Set( "vid_ref", "soft" );

			/*
			** drop the console if we fail to load a refresh
			*/
			if ( cls.key_dest != key_console )
			{
				Con_ToggleConsole_f();
			}
		}
		cls.disable_screen = false;
	}

}

/*
============
VID_Init
============
*/
void VID_Init (void)
{
	/* Create the video variables so we know how to start the graphics drivers */
	// if DISPLAY is defined, try X
	if (getenv("DISPLAY"))
		vid_ref = Cvar_Get ("vid_ref", "softx", CVAR_ARCHIVE);
	else
		vid_ref = Cvar_Get ("vid_ref", "soft", CVAR_ARCHIVE);
	vid_xpos = Cvar_Get ("vid_xpos", "3", CVAR_ARCHIVE);
	vid_ypos = Cvar_Get ("vid_ypos", "22", CVAR_ARCHIVE);
	vid_fullscreen = Cvar_Get ("vid_fullscreen", "0", CVAR_ARCHIVE);
	vid_gamma = Cvar_Get( "vid_gamma", "1", CVAR_ARCHIVE );

	/* Add some console commands that we want to handle */
	Cmd_AddCommand ("vid_restart", VID_Restart_f);

	/* Disable the 3Dfx splash screen */
	putenv("FX_GLIDE_NO_SPLASH=0");
		
	/* Start the graphics mode and load refresh DLL */
	VID_CheckChanges();
}

/*
============
VID_Shutdown
============
*/
void VID_Shutdown (void)
{
	if ( reflib_active )
	{
		if (KBD_Close_fp)
			KBD_Close_fp();
		if (RW_IN_Shutdown_fp)
			RW_IN_Shutdown_fp();
		KBD_Close_fp = NULL;
		RW_IN_Shutdown_fp = NULL;
		re.Shutdown ();
		VID_FreeReflib ();
	}
}


/*****************************************************************************/
/* INPUT                                                                     */
/*****************************************************************************/

cvar_t	*in_joystick;

// This is fake, it's acutally done by the Refresh load
void IN_Init (void)
{
	in_joystick	= Cvar_Get ("in_joystick", "0", CVAR_ARCHIVE);
}

void Real_IN_Init (void)
{
	if (RW_IN_Init_fp)
		RW_IN_Init_fp(&in_state);
}

void IN_Shutdown (void)
{
	if (RW_IN_Shutdown_fp)
		RW_IN_Shutdown_fp();
}

void IN_Commands (void)
{
	if (RW_IN_Commands_fp)
		RW_IN_Commands_fp();
}

void IN_Move (usercmd_t *cmd)
{
	if (RW_IN_Move_fp)
		RW_IN_Move_fp(cmd);
}

void IN_Frame (void)
{
	if (RW_IN_Activate_fp) 
	{
		if ( !cl.refresh_prepped || cls.key_dest == key_console || cls.key_dest == key_menu)
			RW_IN_Activate_fp(false);
		else
			RW_IN_Activate_fp(true);
	}

	if (RW_IN_Frame_fp)
		RW_IN_Frame_fp();
}

void IN_Activate (qboolean active)
{
}

void Do_Key_Event(int key, qboolean down)
{
	Key_Event(key, down, Sys_Milliseconds());
}

