/*
 * 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.
 *
 * =======================================================================
 *
 * This is the "heart" of the id Tech 2 refresh engine. This file
 * implements the main window in which Quake II is running. The window
 * itself is created by the SDL backend, but here the refresh module is
 * loaded, initialized and it's interaction with the operating system
 * implemented. This code is also the interconnect between the input
 * system (the mouse) and the keyboard system, both are here tied
 * together with the refresher. The direct interaction between the
 * refresher and those subsystems are the main cause for the very
 * acurate and precise input controls of the id Tech 2.
 *
 * This implementation works for Windows and unixoid systems, but
 * other platforms may need an own implementation!
 *
 * =======================================================================
 */

#include <assert.h>
#include <errno.h>

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

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

/* This must be the same as in videomenu.c! */
vidmode_t vid_modes[] = {
	{"Mode 0: 320x240", 320, 240, 0},
	{"Mode 1: 400x300", 400, 300, 1},
	{"Mode 2: 512x384", 512, 384, 2},
	{"Mode 3: 640x400", 640, 400, 3},
	{"Mode 4: 640x480", 640, 480, 4},
	{"Mode 5: 800x500", 800, 500, 5},
	{"Mode 6: 800x600", 800, 600, 6},
	{"Mode 7: 960x720", 960, 720, 7},
	{"Mode 8: 1024x480", 1024, 480, 8},
	{"Mode 9: 1024x640", 1024, 640, 9},
	{"Mode 10: 1024x768", 1024, 768, 10},
	{"Mode 11: 1152x768", 1152, 768, 11},
	{"Mode 12: 1152x864", 1152, 864, 12},
	{"Mode 13: 1280x800", 1280, 800, 13},
	{"Mode 14: 1280x854", 1280, 854, 14},
	{"Mode 15: 1280x960", 1280, 960, 15},
	{"Mode 16: 1280x1024", 1280, 1024, 16},
	{"Mode 17: 1366x768", 1366, 768, 17},
	{"Mode 18: 1440x900", 1440, 900, 18},
	{"Mode 19: 1600x1200", 1600, 1200, 19},
	{"Mode 20: 1680x1050", 1680, 1050, 20},
	{"Mode 21: 1920x1080", 1920, 1080, 21},
	{"Mode 22: 1920x1200", 1920, 1200, 22},
	{"Mode 23: 2048x1536", 2048, 1536, 23},
};

/* Console variables that we need to access from this module */
cvar_t *vid_gamma;
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 */
qboolean ref_active = false;    /* Is the refresher being used? */

#define VID_NUM_MODES (sizeof(vid_modes) / sizeof(vid_modes[0]))
#define MAXPRINTMSG 4096

void
VID_Printf(int print_level, char *fmt, ...)
{
	va_list argptr;
	char msg[MAXPRINTMSG];

	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];

	va_start(argptr, fmt);
	vsnprintf(msg, MAXPRINTMSG, fmt, argptr);
	va_end(argptr);

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

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

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;
}

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

qboolean
VID_LoadRefresh(void)
{
	// If the refresher is already active
	// we'll shut it down
	VID_Shutdown();

	// Log it!
	Com_Printf("----- refresher initialization -----\n");

	// Declare the refresher as active
	ref_active = true;

	// Initiate the refresher
	if (R_Init(0, 0) == -1)
	{
		VID_Shutdown(); // Isn't that just too bad? :(
		return false;
	}

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

/*
 * 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 refresh
 * and/or video mode to match.
 */
void
VID_CheckChanges(void)
{
	if (vid_fullscreen->modified)
	{
		S_StopAllSounds();

		/* refresh has changed */
		vid_fullscreen->modified = true;
		cl.refresh_prepped = false;
		cl.cinematicpalette_active = false;
		cls.disable_screen = true;

		// Proceed to reboot the refresher
		VID_LoadRefresh();
		cls.disable_screen = false;
	}
}

void
VID_Init(void)
{
	/* Create the video variables so we know how to start the graphics drivers */
	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);

	/* Start the graphics mode and load refresh DLL */
	VID_CheckChanges();
}

void
VID_Shutdown(void)
{
	if (ref_active)
	{
		/* Shut down the renderer */
		R_Shutdown();
	}

	// Declare the refresher as inactive
	ref_active = false;
}