// Emacs style mode select	 -*- C++ -*- 
//-----------------------------------------------------------------------------
//
// $Id:$
//
// Copyright (C) 1993-1996 by id Software, Inc.
//
// This source is available for distribution and/or modification
// only under the terms of the DOOM Source Code License as
// published by id Software. All rights reserved.
//
// The source is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// FITNESS FOR A PARTICULAR PURPOSE. See the DOOM Source Code License
// for more details.
//
// $Log:$
//
// DESCRIPTION:
//
//-----------------------------------------------------------------------------


#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <fnmatch.h>
#include <unistd.h>

// [EP] Compiling hack for OSX, purge this after code upgrade.
#ifdef __APPLE__
#include <CoreFoundation/CoreFoundation.h>
#endif

#include <stdarg.h>
#include <sys/types.h>
#include <sys/time.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <signal.h>
#ifndef NO_GTK
#include <gtk/gtk.h>
#include <gdk/gdkkeysyms.h>
#endif

#include "networkheaders.h"

#include "doomerrors.h"
#include <math.h>

#include "SDL.h"
#include "doomtype.h"
#include "doomstat.h"
#include "version.h"
#include "doomdef.h"
#include "cmdlib.h"
#include "m_argv.h"
#include "m_misc.h"
#include "i_video.h"
#include "i_sound.h"
#include "i_music.h"
#include "x86.h"

#include "d_main.h"
#include "d_net.h"
#include "g_game.h"
#include "i_system.h"
#include "c_dispatch.h"
#include "templates.h"
#include "v_palette.h"
#include "textures.h"
#include "bitmap.h"

#include "stats.h"
#include "hardware.h"
#include "gameconfigfile.h"

#include "m_fixed.h"
#include "g_level.h"

#include "cl_demo.h"
#include "cl_main.h"
#include "v_text.h"

#ifdef USE_XCURSOR
// Xlib has its own GC, so don't let it interfere.
#define GC XGC
#include <X11/Xcursor/Xcursor.h>
#undef GC
#endif

EXTERN_CVAR (String, language)

extern "C"
{
	double		SecondsPerCycle = 1e-8;
	double		CyclesPerSecond = 1e8;
}

#ifndef NO_GTK
extern bool GtkAvailable;
#elif defined(__APPLE__)
int I_PickIWad_Cocoa (WadStuff *wads, int numwads, bool showwin, int defaultiwad);
#endif
#ifdef USE_XCURSOR
bool UseXCursor;
SDL_Cursor *X11Cursor;
SDL_Cursor *FirstCursor;
#endif

DWORD LanguageIDs[4] =
{
	MAKE_ID ('e','n','u',0),
	MAKE_ID ('e','n','u',0),
	MAKE_ID ('e','n','u',0),
	MAKE_ID ('e','n','u',0)
};
	
int (*I_GetTime) (bool saveMS);
int (*I_WaitForTic) (int);
void (*I_FreezeTime) (bool frozen);

void I_Tactile (int on, int off, int total)
{
    // UNUSED.
    on = off = total = 0;
}

ticcmd_t emptycmd;
ticcmd_t *I_BaseTiccmd(void)
{
    return &emptycmd;
}

void I_BeginRead(void)
{
}

void I_EndRead(void)
{
}


static DWORD TicStart;
static DWORD TicNext;
static DWORD BaseTime;
static int TicFrozen;

// Signal based timer.
static Semaphore timerWait;
static int tics;
static DWORD sig_start, sig_next;

void I_SelectTimer();

// [RH] Returns time in milliseconds
unsigned int I_MSTime (void)
{
	unsigned int time = SDL_GetTicks ();
	return time - BaseTime;
}

// Exactly the same thing, but based does no modification to the time.
unsigned int I_FPSTime()
{
	return SDL_GetTicks();
}

//
// I_GetTime
// returns time in 1/35th second tics
//
int I_GetTimeSelect (bool saveMS)
{
	I_SelectTimer();
	return I_GetTime (saveMS);
}

int I_GetTimePolled (bool saveMS)
{
	if (TicFrozen != 0)
	{
		return TicFrozen;
	}

	DWORD tm = SDL_GetTicks();

	if (saveMS)
	{
		// [Leo] Replaced the expressions for TicStart and TicNext below.
		/*
		TicStart = tm;
		TicNext = Scale((Scale (tm, TICRATE, 1000) + 1), 1000, TICRATE);
		*/
		DWORD CurrentTic = ((tm - BaseTime) * TICRATE) / 1000;
		TicStart = (CurrentTic * 1000 / TICRATE) + BaseTime;
		TicNext = ((CurrentTic + 1) * 1000 / TICRATE) + BaseTime;
	}
	return Scale(tm - BaseTime, TICRATE, 1000);
}

int I_GetTimeSignaled (bool saveMS)
{
	if (saveMS)
	{
		TicStart = sig_start;
		TicNext = sig_next;
	}
	return tics;
}

int I_WaitForTicPolled (int prevtic)
{
    int time;

	assert (TicFrozen == 0);
    while ((time = I_GetTimePolled(false)) <= prevtic)
		;

    return time;
}

int I_WaitForTicSignaled (int prevtic)
{
	assert (TicFrozen == 0);

	while(tics <= prevtic)
	{
		SEMAPHORE_WAIT(timerWait)
	}

	return tics;
}

void I_FreezeTimeSelect (bool frozen)
{
	I_SelectTimer();
	return I_FreezeTime (frozen);
}

void I_FreezeTimePolled (bool frozen)
{
	if (frozen)
	{
		assert(TicFrozen == 0);
		TicFrozen = I_GetTimePolled(false);
	}
	else
	{
		assert(TicFrozen != 0);
		int froze = TicFrozen;
		TicFrozen = 0;
		int now = I_GetTimePolled(false);
		BaseTime += (now - froze) * 1000 / TICRATE;
	}
}

void I_FreezeTimeSignaled (bool frozen)
{
	TicFrozen = frozen;
}

int I_WaitForTicSelect (int prevtic)
{
	I_SelectTimer();
	return I_WaitForTic (prevtic);
}

//
// I_HandleAlarm
// Should be called every time there is an alarm.
//
void I_HandleAlarm (int sig)
{
	if(!TicFrozen)
		tics++;
	sig_start = SDL_GetTicks();
	sig_next = Scale((Scale (sig_start, TICRATE, 1000) + 1), 1000, TICRATE);
	SEMAPHORE_SIGNAL(timerWait)
}

//
// I_SelectTimer
// Sets up the timer function based on if we can use signals for efficent CPU
// usage.
//
void I_SelectTimer()
{
	SEMAPHORE_INIT(timerWait, 0, 0)
#ifndef __sun
	signal(SIGALRM, I_HandleAlarm);
#else
	struct sigaction alrmaction;
	sigaction(SIGALRM, NULL, &alrmaction);
	alrmaction.sa_handler = I_HandleAlarm;
	sigaction(SIGALRM, &alrmaction, NULL);
#endif

	struct itimerval itv;
	itv.it_interval.tv_sec = itv.it_value.tv_sec = 0;
	itv.it_interval.tv_usec = itv.it_value.tv_usec = 1000000/TICRATE;

	if (setitimer(ITIMER_REAL, &itv, NULL) != 0)
	{
		I_GetTime = I_GetTimePolled;
		I_FreezeTime = I_FreezeTimePolled;
		I_WaitForTic = I_WaitForTicPolled;
	}
	else
	{
		I_GetTime = I_GetTimeSignaled;
		I_FreezeTime = I_FreezeTimeSignaled;
		I_WaitForTic = I_WaitForTicSignaled;
	}
}

// Returns the fractional amount of a tic passed since the most recent tic
fixed_t I_GetTimeFrac (uint32 *ms)
{
	DWORD now = SDL_GetTicks ();
	if (ms) *ms = TicNext;
	DWORD step = TicNext - TicStart;
	if (step == 0)
	{
		return FRACUNIT;
	}
	else
	{
		fixed_t frac = clamp<fixed_t> ((now - TicStart)*FRACUNIT/step, 0, FRACUNIT);
		return frac;
	}
}

void I_WaitVBL (int count)
{
    // I_WaitVBL is never used to actually synchronize to the
    // vertical blank. Instead, it's used for delay purposes.
    usleep (1000000 * count / 70);
}

//
// SetLanguageIDs
//
void SetLanguageIDs ()
{
}

//
// I_Init
//
void I_Init (void)
{
	CheckCPUID (&CPU);
	DumpCPUInfo (&CPU);

	I_GetTime = I_GetTimeSelect;
	I_WaitForTic = I_WaitForTicSelect;
	I_FreezeTime = I_FreezeTimeSelect;
	atterm (I_ShutdownSound);
    I_InitSound ();
}

//
// I_Quit
//
static int has_exited;

void I_Quit (void)
{
	has_exited = 1;		/* Prevent infinitely recursive exits -- killough */

	if (demorecording)
		G_CheckDemoStatus();
	// [BC] Support for client-side demos.
	if ( CLIENTDEMO_IsRecording( ))
		CLIENTDEMO_FinishRecording( );
}


//
// I_Error
//
extern FILE *Logfile;
bool gameisdead;

#ifdef __APPLE__
void Mac_I_FatalError(const char* errortext);
#endif

void STACK_ARGS I_FatalError (const char *error, ...)
{
    static bool alreadyThrown = false;
    gameisdead = true;

    if (!alreadyThrown)		// ignore all but the first message -- killough
    {
		alreadyThrown = true;
		char errortext[MAX_ERRORTEXT];
		int index;
		va_list argptr;
		va_start (argptr, error);
		index = vsnprintf (errortext, MAX_ERRORTEXT, error, argptr);
		va_end (argptr);

#ifdef __APPLE__
		Mac_I_FatalError(errortext);
#endif // __APPLE__		
		
		// Record error to log (if logging)
		if (Logfile)
		{
			fprintf (Logfile, "\n**** DIED WITH FATAL ERROR:\n%s\n", errortext);
			fflush (Logfile);
		}

		// [BB] Tell the server we're leaving the game.
		if ( NETWORK_GetState( ) == NETSTATE_CLIENT )
			CLIENT_QuitNetworkGame( NULL );

//		throw CFatalError (errortext);
		fprintf (stderr, "%s\n", errortext);
		exit (-1);
    }

    if (!has_exited)	// If it hasn't exited yet, exit now -- killough
    {
		has_exited = 1;	// Prevent infinitely recursive exits -- killough
		exit(-1);
    }
}

void STACK_ARGS I_Error (const char *error, ...)
{
	va_list argptr;
	char errortext[MAX_ERRORTEXT];

	va_start (argptr, error);
	vsprintf (errortext, error, argptr);
	va_end (argptr);

	throw CRecoverableError (errortext);
}

void I_SetIWADInfo ()
{
}

void I_PrintStr (const char *cp)
{
	// Strip out any color escape sequences before writing to the log file
	char * copy = new char[strlen(cp)+1];
	const char * srcp = cp;
	char * dstp = copy;

	while (*srcp != 0)
	{
		if (*srcp!=0x1c && *srcp!=0x1d && *srcp!=0x1e && *srcp!=0x1f)
		{
			*dstp++=*srcp++;
		}
		else
		{
			if (srcp[1]!=0) srcp+=2;
			else break;
		}
	}
	*dstp=0;

	fputs (copy, stdout);
	delete [] copy;
	fflush (stdout);
}

#ifndef NO_GTK
// GtkTreeViews eats return keys. I want this to be like a Windows listbox
// where pressing Return can still activate the default button.
gint AllowDefault(GtkWidget *widget, GdkEventKey *event, gpointer func_data)
{
	if (event->type == GDK_KEY_PRESS && event->keyval == GDK_Return)
	{
		gtk_window_activate_default (GTK_WINDOW(func_data));
	}
	return FALSE;
}

// Double-clicking an entry in the list is the same as pressing OK.
gint DoubleClickChecker(GtkWidget *widget, GdkEventButton *event, gpointer func_data)
{
	if (event->type == GDK_2BUTTON_PRESS)
	{
		*(int *)func_data = 1;
		gtk_main_quit();
	}
	return FALSE;
}

// When the user presses escape, that should be the same as canceling the dialog.
gint CheckEscape (GtkWidget *widget, GdkEventKey *event, gpointer func_data)
{
	if (event->type == GDK_KEY_PRESS && event->keyval == GDK_Escape)
	{
		gtk_main_quit();
	}
	return FALSE;
}

void ClickedOK(GtkButton *button, gpointer func_data)
{
	*(int *)func_data = 1;
	gtk_main_quit();
}

EXTERN_CVAR (Bool, queryiwad);

int I_PickIWad_Gtk (WadStuff *wads, int numwads, bool showwin, int defaultiwad)
{
	GtkWidget *window;
	GtkWidget *vbox;
	GtkWidget *hbox;
	GtkWidget *bbox;
	GtkWidget *widget;
	GtkWidget *tree;
	GtkWidget *check;
	GtkListStore *store;
	GtkCellRenderer *renderer;
	GtkTreeViewColumn *column;
	GtkTreeSelection *selection;
	GtkTreeIter iter, defiter;
	int close_style = 0;
	int i;
	char caption[100];

	// Create the dialog window.
	window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
	mysnprintf(caption, countof(caption), GAMESIG " %s: Select an IWAD to use", GetVersionString());
	gtk_window_set_title (GTK_WINDOW(window), caption);
	gtk_window_set_position (GTK_WINDOW(window), GTK_WIN_POS_CENTER);
	gtk_container_set_border_width (GTK_CONTAINER(window), 10);
	g_signal_connect (window, "delete_event", G_CALLBACK(gtk_main_quit), NULL);
	g_signal_connect (window, "key_press_event", G_CALLBACK(CheckEscape), NULL);

	// Create the vbox container.
	vbox = gtk_vbox_new (FALSE, 10);
	gtk_container_add (GTK_CONTAINER(window), vbox);

	// Create the top label.
	widget = gtk_label_new ("ZDoom found more than one IWAD\nSelect from the list below to determine which one to use:");
	gtk_box_pack_start (GTK_BOX(vbox), widget, false, false, 0);
	gtk_misc_set_alignment (GTK_MISC(widget), 0, 0);

	// Create a list store with all the found IWADs.
	store = gtk_list_store_new (3, G_TYPE_STRING, G_TYPE_STRING, G_TYPE_INT);
	for (i = 0; i < numwads; ++i)
	{
		const char *filepart = strrchr (wads[i].Path, '/');
		if (filepart == NULL)
			filepart = wads[i].Path;
		else
			filepart++;
		gtk_list_store_append (store, &iter);
		gtk_list_store_set (store, &iter,
			0, filepart,
			1, wads[i].Name.GetChars(),
			2, i,
			-1);
		if (i == defaultiwad)
		{
			defiter = iter;
		}
	}

	// Create the tree view control to show the list.
	tree = gtk_tree_view_new_with_model (GTK_TREE_MODEL(store));
	renderer = gtk_cell_renderer_text_new ();
	column = gtk_tree_view_column_new_with_attributes ("IWAD", renderer, "text", 0, NULL);
	gtk_tree_view_append_column (GTK_TREE_VIEW(tree), column);
	renderer = gtk_cell_renderer_text_new ();
	column = gtk_tree_view_column_new_with_attributes ("Game", renderer, "text", 1, NULL);
	gtk_tree_view_append_column (GTK_TREE_VIEW(tree), column);
	gtk_box_pack_start (GTK_BOX(vbox), GTK_WIDGET(tree), true, true, 0);
	g_signal_connect(G_OBJECT(tree), "button_press_event", G_CALLBACK(DoubleClickChecker), &close_style);
	g_signal_connect(G_OBJECT(tree), "key_press_event", G_CALLBACK(AllowDefault), window);

	// Select the default IWAD.
	selection = gtk_tree_view_get_selection (GTK_TREE_VIEW(tree));
	gtk_tree_selection_select_iter (selection, &defiter);

	// Create the hbox for the bottom row.
	hbox = gtk_hbox_new (FALSE, 0);
	gtk_box_pack_end (GTK_BOX(vbox), hbox, false, false, 0);

	// Create the "Don't ask" checkbox.
	check = gtk_check_button_new_with_label ("Don't ask me this again");
	gtk_box_pack_start (GTK_BOX(hbox), check, false, false, 0);
	gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON(check), !showwin);

	// Create the OK/Cancel button box.
	bbox = gtk_hbutton_box_new ();
	gtk_button_box_set_layout (GTK_BUTTON_BOX(bbox), GTK_BUTTONBOX_END);
	gtk_box_set_spacing (GTK_BOX(bbox), 10);
	gtk_box_pack_end (GTK_BOX(hbox), bbox, false, false, 0);

	// Create the OK button.
	widget = gtk_button_new_from_stock (GTK_STOCK_OK);
	gtk_box_pack_start (GTK_BOX(bbox), widget, false, false, 0);
	GTK_WIDGET_SET_FLAGS (widget, GTK_CAN_DEFAULT);
	gtk_widget_grab_default (widget);
	g_signal_connect (widget, "clicked", G_CALLBACK(ClickedOK), &close_style);
	g_signal_connect (widget, "activate", G_CALLBACK(ClickedOK), &close_style);

	// Create the cancel button.
	widget = gtk_button_new_from_stock (GTK_STOCK_CANCEL);
	gtk_box_pack_start (GTK_BOX(bbox), widget, false, false, 0);
	g_signal_connect (widget, "clicked", G_CALLBACK(gtk_main_quit), &window);

	// Finally we can show everything.
	gtk_widget_show_all (window);

	gtk_main ();

	if (close_style == 1)
	{
		GtkTreeModel *model;
		GValue value = { 0, { {0} } };
		
		// Find out which IWAD was selected.
		gtk_tree_selection_get_selected (selection, &model, &iter);
		gtk_tree_model_get_value (GTK_TREE_MODEL(model), &iter, 2, &value);
		i = g_value_get_int (&value);
		g_value_unset (&value);
		
		// Set state of queryiwad based on the checkbox.
		queryiwad = !gtk_toggle_button_get_active (GTK_TOGGLE_BUTTON(check));
	}
	else
	{
		i = -1;
	}
	
	if (GTK_IS_WINDOW(window))
	{
		gtk_widget_destroy (window);
		// If we don't do this, then the X window might not actually disappear.
		while (g_main_context_iteration (NULL, FALSE)) {}
	}

	return i;
}
#endif

int I_PickIWad (WadStuff *wads, int numwads, bool showwin, int defaultiwad)
{
	int i;

	if (!showwin)
	{
		return defaultiwad;
	}

#if !defined(__APPLE__)
	const char *str;
	if((str=getenv("KDE_FULL_SESSION")) && strcmp(str, "true") == 0)
	{
		FString cmd("kdialog --title \"" GAMESIG " ");
		cmd << GetVersionString() << ": Select an IWAD to use\""
		            " --menu \"ZDoom found more than one IWAD\n"
		            "Select from the list below to determine which one to use:\"";

		for(i = 0; i < numwads; ++i)
		{
			const char *filepart = strrchr(wads[i].Path, '/');
			if(filepart == NULL)
				filepart = wads[i].Path;
			else
				filepart++;
			// Menu entries are specified in "tag" "item" pairs, where when a
			// particular item is selected (and the Okay button clicked), its
			// corresponding tag is printed to stdout for identification.
			cmd.AppendFormat(" \"%d\" \"%s (%s)\"", i, wads[i].Name.GetChars(), filepart);
		}

		if(defaultiwad >= 0 && defaultiwad < numwads)
		{
			const char *filepart = strrchr(wads[defaultiwad].Path, '/');
			if(filepart == NULL)
				filepart = wads[defaultiwad].Path;
			else
				filepart++;
			cmd.AppendFormat(" --default \"%s (%s)\"", wads[defaultiwad].Name.GetChars(), filepart);
		}

		FILE *f = popen(cmd, "r");
		if(f != NULL)
		{
			char gotstr[16];

			if(fgets(gotstr, sizeof(gotstr), f) == NULL ||
			   sscanf(gotstr, "%d", &i) != 1)
				i = -1;

			// Exit status = 1 means the selection was canceled (either by
			// Cancel/Esc or the X button), not that there was an error running
			// the program. In that case, nothing was printed so fgets will
			// have failed. Other values can indicate an error running the app,
			// so fall back to whatever else can be used.
			int status = pclose(f);
			if(WIFEXITED(status) && (WEXITSTATUS(status) == 0 || WEXITSTATUS(status) == 1))
				return i;
		}
	}
#endif
#ifndef NO_GTK
	if (GtkAvailable)
	{
		return I_PickIWad_Gtk (wads, numwads, showwin, defaultiwad);
	}
#elif defined(__APPLE__)
	return I_PickIWad_Cocoa (wads, numwads, showwin, defaultiwad);
#endif
	
	printf ("Please select a game wad (or 0 to exit):\n");
	for (i = 0; i < numwads; ++i)
	{
		const char *filepart = strrchr (wads[i].Path, '/');
		if (filepart == NULL)
			filepart = wads[i].Path;
		else
			filepart++;
		printf ("%d. %s (%s)\n", i+1, wads[i].Name.GetChars(), filepart);
	}
	printf ("Which one? ");
	if (scanf ("%d", &i) != 1 || i > numwads)
		return -1;
	return i-1;
}

bool I_WriteIniFailed ()
{
	printf ("The config file %s could not be saved:\n%s\n", GameConfig->GetPathName(), strerror(errno));
	return false;
	// return true to retry
}

static const char *pattern;

// [BB] Added FreeBSD checks
#if ( defined(__APPLE__) && MAC_OS_X_VERSION_MAX_ALLOWED < 1080 ) || ( defined ( __FreeBSD__ ) && ( __FreeBSD__ < 8 ) )
static int matchfile (struct dirent *ent)
#else
static int matchfile (const struct dirent *ent)
#endif
{
    return fnmatch (pattern, ent->d_name, FNM_NOESCAPE) == 0;
}

void *I_FindFirst (const char *filespec, findstate_t *fileinfo)
{
	FString dir;
	
	const char *slash = strrchr (filespec, '/');
	if (slash)
	{
		pattern = slash+1;
		dir = FString(filespec, slash-filespec+1);
	}
	else
	{
		pattern = filespec;
		dir = ".";
	}

    fileinfo->current = 0;
    fileinfo->count = scandir (dir.GetChars(), &fileinfo->namelist,
							   matchfile, alphasort);
    if (fileinfo->count > 0)
    {
		return fileinfo;
    }
    return (void*)-1;
}

int I_FindNext (void *handle, findstate_t *fileinfo)
{
    findstate_t *state = (findstate_t *)handle;
    if (state->current < fileinfo->count)
    {
	    return ++state->current < fileinfo->count ? 0 : -1;
	}
	return -1;
}

int I_FindClose (void *handle)
{
	findstate_t *state = (findstate_t *)handle;
	if (handle != (void*)-1 && state->count > 0)
	{
		for(int i = 0;i < state->count;++i)
			free (state->namelist[i]);
		state->count = 0;
		free (state->namelist);
		state->namelist = NULL;
	}
	return 0;
}

int I_FindAttr (findstate_t *fileinfo)
{
	dirent *ent = fileinfo->namelist[fileinfo->current];
	struct stat buf;

	if (stat(ent->d_name, &buf) == 0)
	{
		return S_ISDIR(buf.st_mode) ? FA_DIREC : 0;
	}
	return 0;
}

// Clipboard support requires GTK+
// TODO: GTK+ uses UTF-8. We don't, so some conversions would be appropriate.
void I_PutInClipboard (const char *str)
{
#ifndef NO_GTK
	if (GtkAvailable)
	{
		GtkClipboard *clipboard = gtk_clipboard_get(GDK_SELECTION_CLIPBOARD);
		if (clipboard != NULL)
		{
			gtk_clipboard_set_text(clipboard, str, -1);
		}
		/* Should I? I don't know. It's not actually a selection.
		clipboard = gtk_clipboard_get(GDK_SELECTION_PRIMARY);
		if (clipboard != NULL)
		{
			gtk_clipboard_set_text(clipboard, str, -1);
		}
		*/
	}
#endif
}

FString I_GetFromClipboard (bool use_primary_selection)
{
#ifndef NO_GTK
	if (GtkAvailable)
	{
		GtkClipboard *clipboard = gtk_clipboard_get(use_primary_selection ?
			GDK_SELECTION_PRIMARY : GDK_SELECTION_CLIPBOARD);
		if (clipboard != NULL)
		{
			gchar *text = gtk_clipboard_wait_for_text(clipboard);
			if (text != NULL)
			{
				FString copy(text);
				g_free(text);
				return copy;
			}
		}
	}
#endif
	return "";
}

// Return a random seed, preferably one with lots of entropy.
unsigned int I_MakeRNGSeed()
{
	unsigned int seed;
	int file;

	// Try reading from /dev/urandom first, then /dev/random, then
	// if all else fails, use a crappy seed from time().
	seed = time(NULL);
	file = open("/dev/urandom", O_RDONLY);
	if (file < 0)
	{
		file = open("/dev/random", O_RDONLY);
	}
	if (file >= 0)
	{
		read(file, &seed, sizeof(seed));
		close(file);
	}
	return seed;
}

#ifdef USE_XCURSOR
// Hack! Hack! SDL does not provide a clean way to get the XDisplay.
// On the other hand, there are no more planned updates for SDL 1.2,
// so we should be fine making assumptions.
struct SDL_PrivateVideoData
{
	int local_X11;
	Display *X11_Display;
};

struct SDL_VideoDevice
{
	const char *name;
	int (*functions[9])();
	SDL_VideoInfo info;
	SDL_PixelFormat *displayformatalphapixel;
	int (*morefuncs[9])();
	Uint16 *gamma;
	int (*somefuncs[9])();
	unsigned int texture;				// Only here if SDL was compiled with OpenGL support. Ack!
	int is_32bit;
	int (*itsafuncs[13])();
	SDL_Surface *surfaces[3];
	SDL_Palette *physpal;
	SDL_Color *gammacols;
	char *wm_strings[2];
	int offsets[2];
	SDL_GrabMode input_grab;
	int handles_any_size;
	SDL_PrivateVideoData *hidden;	// Why did they have to bury this so far in?
};

extern SDL_VideoDevice *current_video;
#define SDL_Display (current_video->hidden->X11_Display)

SDL_Cursor *CreateColorCursor(FTexture *cursorpic)
{
	return NULL;
}
#endif

SDL_Surface *cursorSurface = NULL;
SDL_Rect cursorBlit = {0, 0, 32, 32};
bool I_SetCursor(FTexture *cursorpic)
{
	if (cursorpic != NULL && cursorpic->UseType != FTexture::TEX_Null)
	{
		// Must be no larger than 32x32.
		if (cursorpic->GetWidth() > 32 || cursorpic->GetHeight() > 32)
		{
			return false;
		}

#ifdef USE_XCURSOR
		if (UseXCursor)
		{
			if (FirstCursor == NULL)
			{
				FirstCursor = SDL_GetCursor();
			}
			X11Cursor = CreateColorCursor(cursorpic);
			if (X11Cursor != NULL)
			{
				SDL_SetCursor(X11Cursor);
				return true;
			}
		}
#endif
		if (cursorSurface == NULL)
			cursorSurface = SDL_CreateRGBSurface (0, 32, 32, 32, MAKEARGB(0,255,0,0), MAKEARGB(0,0,255,0), MAKEARGB(0,0,0,255), MAKEARGB(255,0,0,0));

		SDL_ShowCursor(0);
		SDL_LockSurface(cursorSurface);
		BYTE buffer[32*32*4];
		memset(buffer, 0, 32*32*4);
		FBitmap bmp(buffer, 32*4, 32, 32);
		cursorpic->CopyTrueColorPixels(&bmp, 0, 0);
		memcpy(cursorSurface->pixels, bmp.GetPixels(), 32*32*4);
		SDL_UnlockSurface(cursorSurface);
	}
	else
	{
		SDL_ShowCursor(1);

		if (cursorSurface != NULL)
		{
			SDL_FreeSurface(cursorSurface);
			cursorSurface = NULL;
		}
#ifdef USE_XCURSOR
		if (X11Cursor != NULL)
		{
			SDL_SetCursor(FirstCursor);
			SDL_FreeCursor(X11Cursor);
			X11Cursor = NULL;
		}
#endif
	}
	return true;
}
