/*
 *  R : A Computer Language for Statistical Data Analysis
 *  file preferences.c
 *  Copyright (C) 2000      Guido Masarotto and Brian Ripley
 *                2004-2018 R Core Team
 *
 *  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, a copy is available at
 *  https://www.R-project.org/Licenses/
 */

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include "win-nls.h"

#ifdef Win32
#define USE_MDI 1
#endif

#define WIN32_LEAN_AND_MEAN 1
#include <windows.h>
#include <ctype.h>  /* isspace */
#include "graphapp/ga.h"
#include "graphapp/graphapp.h"
#include "opt.h"
#include "console.h"
#include "consolestructs.h"
#include "rui.h"
#include "preferences.h"
#include <Fileio.h>
void R_fixbackslash(char *s);

#define gettext GA_gettext

extern char fontname[LF_FACESIZE+4]; /* from console.c */
extern int consolex, consoley; /* from console.c */
extern int pagerMultiple, haveusedapager; /* from pager.c */
void editorsetfont(font f);

static void showDialog(Gui gui);

extern __declspec(dllimport) const char *ColorName[]; /* from graphapp/rgb.c */

static int cmatch(const char *col, const char **list)
{
    int i=0;
    const char **pos = list;
    while(*pos != NULL) {
	if(strcmpi(*pos, col) == 0) return(i);
	i++; pos++;
    }
    return(-1);
}


static const char *StyleList[] = {"normal", "bold", "italic", NULL};
static const char *PointsList[] = {"6", "7", "8", "9", "10", "11", "12", "14", "16", "18", "20", "22", "24", "26", "28", "32", "36", NULL};
static const char *FontsList[] = {"Courier", "Courier New", "FixedSys", "FixedFont", "Lucida Console", "Consolas", "Terminal", "BatangChe", "DotumChe", "GulimChe", "MingLiU", "MS Gothic", "MS Mincho", "NSimSun", NULL};
static const char *GuiElementNames[numGuiColors+1] = {"background", "normaltext", "usertext",
						"pagerbg", "pagertext", "highlight",
						"dataeditbg", "dataedittext", "dataedituser",
						"editorbg", "editortext", NULL};
static const char *BlinkList[] = {"None", "Partial", "Full"};
static window wconfig;
static button bApply, bSave, bLoad, bOK, bCancel;
static label l_mdi, l_mwin, l_font, l_point, l_style, l_lang, l_crows, l_ccols,
    l_cx, l_cy, l_prows, l_pcols, l_grx, l_gry,
    l_cols, l_cbb, l_cbl, l_blink;
static radiogroup g_mwin;
static radiobutton rb_mdi, rb_sdi, rb_mwin, rb_swin;
static listbox f_font, f_style, d_point, guielement, guicolor;
static checkbox toolbar, statusbar, tt_font, c_resize, c_buff;
static field f_crows, f_ccols, f_prows, f_pcols, f_cx, f_cy, f_cbb,f_cbl,
    f_grx, f_gry, f_lang, f_blink;
static textbox guisample;
static font samplefont = NULL;
static int samplePointsize = 10;
static int sampleStyle = Plain;
static int sampleFontNum;

static rgb dialogColors[numGuiColors];

static void getChoices(Gui p)
{
    p->MDI = ischecked(rb_mdi);
    p->toolbar = ischecked(toolbar);
    p->statusbar = ischecked(statusbar);
    p->pagerMultiple = ischecked(rb_mwin);
    strncpy(p->language, gettext(f_lang), sizeof(p->language)-1);
    p->language[sizeof(p->language)-1] = '\0';
    strncpy(p->font, gettext(f_font), sizeof(p->font)-1);
    p->font[sizeof(p->font)-1] = '\0';
    p->tt_font = ischecked(tt_font);
    p->pointsize = atoi(gettext(d_point));
    strncpy(p->style, gettext(f_style), sizeof(p->style)-1);
    p->style[sizeof(p->style)-1] = '\0';
    p->crows = atoi(gettext(f_crows));
    p->ccols = atoi(gettext(f_ccols));
    p->cx = atoi(gettext(f_cx));
    p->cy = atoi(gettext(f_cy));
    p->setWidthOnResize = ischecked(c_resize);
    p->buffered = ischecked(c_buff);
    p->cbb = atoi(gettext(f_cbb));
    p->cbl = atoi(gettext(f_cbl));
    p->prows = atoi(gettext(f_prows));
    p->pcols = atoi(gettext(f_pcols));
    p->grx = atoi(gettext(f_grx));
    p->gry = atoi(gettext(f_gry));
    p->cursor_blink = getlistitem(f_blink);
    dialogColors[cmatch(gettext(guielement),GuiElementNames)] = nametorgb(gettext(guicolor));
    for (int i=0; i<numGuiColors; i++)
	p->guiColors[i] = dialogColors[i];    
    /* MDIsize is not currently a choice in the dialog, only in the Rconsole file */
    p->warning[0] = 0;
}

void getDefaults(Gui gui)
{
    gui->crows = 25;
    gui->ccols = 80;
    gui->cx = gui->cy = 0;
    gui->grx = Rwin_graphicsx;
    gui->gry = Rwin_graphicsy;
    gui->cursor_blink = 1; /* partial */
    gui->guiColors[consolebg] = White;
    gui->guiColors[consolefg] = DarkBlue;
    gui->guiColors[consoleuser] = gaRed;
    gui->guiColors[pagerbg] = White;
    gui->guiColors[pagerfg] = DarkBlue;   
    gui->guiColors[pagerhighlight] = DarkRed;
    gui->guiColors[dataeditbg] = White;
    gui->guiColors[dataeditfg] = DarkBlue;
    gui->guiColors[dataedituser] = gaRed;    
    gui->guiColors[editorbg] = White;
    gui->guiColors[editorfg] = Black;    
    gui->prows = 25;
    gui->pcols = 80;
    gui->pagerMultiple = 0;
    gui->cbb = 65000;
    gui->cbl = 8000;
    gui->setWidthOnResize = 1;
    strcpy(gui->font, "Courier New");
    strcpy(gui->style, "normal");
    gui->tt_font = 1;
    gui->pointsize = 10;
    strcpy(gui->language, "");
    gui->buffered = 1;
    gui->warning[0] = 0;

#ifdef USE_MDI
    gui->toolbar = ((RguiMDI & RW_TOOLBAR) != 0);
    gui->statusbar = ((RguiMDI & RW_STATUSBAR) != 0);
    gui->MDI = ((RguiMDI & RW_MDI) != 0);

    gui->MDIsize = rect(0, 0, 0, 0);
#endif
}

void getActive(Gui gui)
{
    rect r;
    ConsoleData p;
    if (RConsole && (p = (ConsoleData) getdata(RConsole))) {

	gui->toolbar = ((RguiMDI & RW_TOOLBAR) != 0);
	gui->statusbar = ((RguiMDI & RW_STATUSBAR) != 0);
	gui->MDI = ((RguiMDI & RW_MDI) != 0);
	gui->pagerMultiple = pagerMultiple;
	{
	    const char *p = getenv("LANGUAGE");
	    strncpy(gui->language, p ? p : "", sizeof(gui->language)-1);
	    gui->language[sizeof(gui->language)-1] = '\0';
	}

	/* Font, pointsize, style */

	gui->tt_font = FALSE;
	{
	    const char *pf;
	    if ((strlen(fontname) > 1) &&
		(fontname[0] == 'T') && (fontname[1] == 'T')) {
		gui->tt_font = TRUE;
		for (pf = fontname+2; isspace(*pf) ; pf++);
	    } else pf = fontname;
	    strncpy(gui->font, pf, sizeof(gui->font)-1);
	    gui->font[sizeof(gui->font)-1] = '\0';
	}

	gui->pointsize = pointsize;

	if (fontsty & Italic) strcpy(gui->style, "italic");
	else if (fontsty & Bold) strcpy(gui->style, "Bold");
	else strcpy(gui->style, "normal");

	/* Console size, set widthonresize */
	gui->crows = ROWS;
	gui->ccols = COLS;
	r = GetCurrentWinPos(RConsole);
	gui->cx = r.x;
	gui->cy = r.y;
	gui->setWidthOnResize = setWidthOnResize;
	gui->cbb = p->lbuf->dim;
	gui->cbl = p->lbuf->ms;
	gui->buffered = consolebuffered;

	/* Pager size */
	gui->prows = pagerrow;
	gui->pcols = pagercol;

	/* Graphics window */
	gui->grx = Rwin_graphicsx;
	gui->gry = Rwin_graphicsy;

        /* Cursor blink */
        gui->cursor_blink = p->cursor_blink;
        
	/* Font colours */
	for (int i=0; i<numGuiColors; i++)
	    gui->guiColors[i] = guiColors[i];

	/* MDIsize is not currently a choice in the dialog, only in the Rconsole file, so is not set here */
	gui->warning[0] = 0;
    } else
	getDefaults(gui);
}

static int has_changed(Gui a, Gui b)
{
    Rboolean colorchange = FALSE;
    if (a)
	for (int i=0; i<numGuiColors; i++)
    	    colorchange |= a->guiColors[i] != b->guiColors[i];
    	
    return !a || colorchange ||
	a->MDI != b->MDI ||
	a->toolbar != b->toolbar ||
	a->statusbar != b->statusbar ||
	a->pagerMultiple != b->pagerMultiple ||
	strcmp(a->language, b->language) ||
	strcmp(a->font, b->font) ||
	a->tt_font != b->tt_font ||
	a->pointsize != b->pointsize ||
	strcmp(a->style, b->style) ||
	a->crows != b->crows ||
	a->ccols != b->ccols ||
	a->cx != b->cx ||
	a->cy != b->cy ||
	a->cbb != b->cbb ||
	a->cbl != b->cbl ||
	a->setWidthOnResize != b->setWidthOnResize ||
	a->prows != b->prows ||
	a->pcols != b->pcols ||
	a->grx != b->grx ||
	a->gry != b->gry ||
	a->cursor_blink != b->cursor_blink;
}


static void cleanup(void)
{
    hide(wconfig);
    delobj(l_mdi); delobj(rb_mdi); delobj(rb_sdi);
    delobj(toolbar); delobj(statusbar);
    delobj(l_mwin); delobj(g_mwin); delobj(rb_mwin); delobj(rb_swin);
    delobj(l_lang); delobj(f_lang);
    delobj(l_font); delobj(f_font); delobj(tt_font);
    delobj(l_point); delobj(d_point);
    delobj(l_style); delobj(f_style);
    delobj(l_crows); delobj(f_crows); delobj(l_ccols); delobj(f_ccols);
    delobj(c_resize); delobj(c_buff);
    delobj(l_cx); delobj(f_cx); delobj(l_cy); delobj(f_cy);
    delobj(l_cbb); delobj(f_cbb); delobj(l_cbl); delobj(f_cbl);
    delobj(l_blink); delobj(f_blink);
    delobj(l_prows); delobj(f_prows); delobj(l_pcols); delobj(f_pcols);
    delobj(l_grx); delobj(f_grx); delobj(l_gry); delobj(f_gry);
    delobj(l_cols);
    delobj(guielement); delobj(guicolor); delobj(guisample);
    delobj(bApply); delobj(bSave); delobj(bOK); delobj(bCancel);
    delobj(wconfig);
}

void applyGUI(Gui newGUI)
{
    rect r = getrect(RConsole);
    ConsoleData p = (ConsoleData) getdata(RConsole);
    int havenewfont = 0;
    struct structGUI curGUI;

    getActive(&curGUI);

    if(!has_changed(&curGUI, newGUI)) return;

    if(newGUI->MDI != curGUI.MDI || newGUI->toolbar != curGUI.toolbar ||
       newGUI->statusbar != curGUI.statusbar)
	askok(G_("The overall console properties cannot be changed\non a running console.\n\nSave the preferences and restart Rgui to apply them.\n"));

    if(strcmp(newGUI->language, curGUI.language)) {
	char *buf = malloc(50);
	askok(G_("The language for menus cannot be changed on a\n running console.\n\nSave the preferences and restart Rgui to apply to menus.\n"));
	snprintf(buf, 50, "LANGUAGE=%s", newGUI->language);
	putenv(buf);
    }


/*  Set a new font? */
    if(strcmp(newGUI->font, curGUI.font) ||
       newGUI->pointsize != curGUI.pointsize ||
       strcmp(newGUI->style, curGUI.style))
    {
	char msg[LF_FACESIZE + 128];
	int sty = Plain;

	if(newGUI->tt_font) strcpy(fontname, "TT "); else strcpy(fontname, "");
	strcat(fontname,  newGUI->font);
	if (!strcmp(newGUI->style, "bold")) sty = Bold;
	if (!strcmp(newGUI->style, "italic")) sty = Italic;
	pointsize = newGUI->pointsize;
	fontsty = sty;

	/* Don't delete font: open pagers may be using it */
	if (strcmp(fontname, "FixedFont"))
	    consolefn = gnewfont(NULL, fontname, fontsty, pointsize, 0.0, 1);
	else consolefn = FixedFont;
	if (!consolefn) {
	    snprintf(msg, LF_FACESIZE + 128,
		     G_("Font %s-%d-%d  not found.\nUsing system fixed font"),
		     fontname, fontsty | FixedWidth, pointsize);
	    R_ShowMessage(msg);
	    consolefn = FixedFont;
	}
	/* if (!ghasfixedwidth(consolefn)) {
	   sprintf(msg,
	   G_("Font %s-%d-%d has variable width.\nUsing system fixed font"),
	   fontname, fontsty, pointsize);
	   R_ShowMessage(msg);
	   consolefn = FixedFont;
	   } */
	p->f = consolefn;
	FH = fontheight(p->f);
	FW = fontwidth(p->f);
	havenewfont = 1;
    }

/* resize console, possibly with new font */
    if (consoler != newGUI->crows || consolec != newGUI->ccols || havenewfont) {
	char buf[20];
	consoler = newGUI->crows;
	consolec = newGUI->ccols;
	r.width = (consolec + 1) * FW;
	r.height = (consoler + 1) * FH;
	resize(RConsole, r);
	snprintf(buf, 20, "%d", ROWS); settext(f_crows, buf);
	snprintf(buf, 20, "%d", COLS); settext(f_ccols, buf);
    }
    if (p->lbuf->dim != newGUI->cbb || p->lbuf->ms != newGUI->cbl)
	xbufgrow(p->lbuf, newGUI->cbb, newGUI->cbl);

/* Set colours and redraw */
    for (int i=0; i<numGuiColors; i++)
    	p->guiColors[i] = guiColors[i] = newGUI->guiColors[i];
    drawconsole(RConsole, r);
    if(haveusedapager &&
       (newGUI->prows != curGUI.prows || newGUI->pcols != curGUI.pcols))
	askok(G_("Changes in pager size will not apply to any open pagers"));
    pagerrow = newGUI->prows;
    pagercol = newGUI->pcols;

    if(newGUI->pagerMultiple != pagerMultiple) {
	if(!haveusedapager ||
	   askokcancel(G_("Do not change pager type if any pager is open\nProceed?"))
	   == YES)
	    pagerMultiple = newGUI->pagerMultiple;
	if(pagerMultiple) {
	    check(rb_mwin); uncheck(rb_swin);
	} else {check(rb_swin); uncheck(rb_mwin);}
    }

    setWidthOnResize = newGUI->setWidthOnResize;
    consolebuffered = newGUI->buffered;

    Rwin_graphicsx = newGUI->grx;
    Rwin_graphicsy = newGUI->gry;
    
    p->cursor_blink = newGUI->cursor_blink;
}

static void do_apply(void)
{
    struct structGUI newGUI;

    getChoices(&newGUI);
    applyGUI(&newGUI);
}

static void save(button b)
{
    char *file, buf[256], *p;
    FILE *fp;

    setuserfilter("All files (*.*)\0*.*\0\0");
    strncpy(buf, getenv("R_USER"), sizeof(buf)-1);
    buf[sizeof(buf)-1] = '\0';
    R_fixbackslash(buf);
    file = askfilesavewithdir(G_("Select directory for file 'Rconsole'"),
			      "Rconsole", buf);
    if(!file) return;
    strncpy(buf, file, sizeof(buf)-1);
    buf[sizeof(buf)-1] = '\0';
    p = buf + strlen(buf) - 2;
    if(!strncmp(p, ".*", 2)) *p = '\0';

    fp = R_fopen(buf, "w");
    if(fp == NULL) {
	MessageBox(0, "Cannot open file to fp",
		   "Configuration Save Error",
		   MB_TASKMODAL | MB_ICONSTOP | MB_OK);
	return;
    }

    fprintf(fp, "%s\n%s\n%s\n\n%s\n%s\n",
	    "# Optional parameters for the console and the pager",
	    "# The system-wide copy is in rwxxxx/etc.",
	    "# A user copy can be installed in `R_USER'.",
	    "## Style",
	    "# This can be `yes' (for MDI) or `no' (for SDI).");
    fprintf(fp, "MDI = %s\n",  ischecked(rb_mdi)?"yes":"no");
    fprintf(fp, "%s\n%s%s\n%s%s\n\n",
	    "# the next two are only relevant for MDI",
	    "toolbar = ", ischecked(toolbar)?"yes":"no",
	    "statusbar = ", ischecked(statusbar)?"yes":"no");

    fprintf(fp, "%s\n%s\n%s\n%s\n%s\n",
	    "## Font.",
	    "# Please use only fixed width font.",
	    "# If font=FixedFont the system fixed font is used; in this case",
	    "# points and style are ignored. If font begins with \"TT \", only",
	    "# True Type fonts are searched for.");
    fprintf(fp, "font = %s%s\npoints = %s\nstyle = %s # Style can be normal, bold, italic\n\n\n",
	    ischecked(tt_font)?"TT ":"",
	    gettext(f_font),
	    gettext(d_point),
	    gettext(f_style));
    fprintf(fp, "# Dimensions (in characters) of the console.\n");
    fprintf(fp, "rows = %s\ncolumns = %s\n",
	    gettext(f_crows), gettext(f_ccols));
    fprintf(fp, "# Dimensions (in characters) of the internal pager.\n");
    fprintf(fp, "pgrows = %s\npgcolumns = %s\n",
	    gettext(f_prows), gettext(f_pcols));
    fprintf(fp, "# should options(width=) be set to the console width?\n");
    fprintf(fp, "setwidthonresize = %s\n\n",
	    ischecked(c_resize) ? "yes" : "no");
    fprintf(fp, "# memory limits for the console scrolling buffer, in chars and lines\n");
    fprintf(fp, "bufbytes = %s\nbuflines = %s\n\n",
	    gettext(f_cbb), gettext(f_cbl));
    fprintf(fp, "# Initial position of the console (pixels, relative to the workspace for MDI)\n");
    fprintf(fp, "xconsole = %s\nyconsole = %s\n\n",
	    gettext(f_cx), gettext(f_cy));
    fprintf(fp, "%s\n%s\n%s\n%s\n%s\n%s\n\n",
	    "# Dimension of MDI frame in pixels",
	    "# Format (w*h+xorg+yorg) or use -ve w and h for offsets from right bottom",
	    "# This will come up maximized if w==0",
	    "# MDIsize = 0*0+0+0",
	    "# MDIsize = 1000*800+100+0",
	    "# MDIsize = -50*-50+50+50  # 50 pixels space all round");
    fprintf(fp, "%s\n%s\n%s\npagerstyle = %s\n\n\n",
	    "# The internal pager can displays help in a single window",
	    "# or in multiple windows (one for each topic)",
	    "# pagerstyle can be set to `singlewindow' or `multiplewindows'",
	    ischecked(rb_mwin) ? "multiplewindows" : "singlewindow");

    fprintf(fp, "## Colours for console and pager(s)\n# (see rwxxxx/etc/rgb.txt for the known colours).\n");
    for (int i=0; i<numGuiColors; i++)
    	fprintf(fp, "%s = %s\n", GuiElementNames[i], rgbtoname(dialogColors[i]));
    fprintf(fp, "\n\n%s\n%s\nxgraphics = %s\nygraphics = %s\n",
	    "## Initial position of the graphics window",
	    "## (pixels, <0 values from opposite edge)",
	    gettext(f_grx), gettext(f_gry));
    fprintf(fp, "\n\n%s\nlanguage = %s\n",
	    "## Language for messages",
	    gettext(f_lang));
    fprintf(fp, "\n\n## Default setting for console buffering: 'yes' or 'no'\n");
    fprintf(fp, "buffered = %s\n",
	    ischecked(c_buff) ? "yes" : "no");
    fprintf(fp, "\n\n%s\ncursor_blink = %s\n",
    	    "## Console cursor blink",
    	    BlinkList[getlistitem(f_blink)]);
    fclose(fp);
}

static void load(button b) /* button callback */
{
    char *optf, buf[256];
    struct structGUI newGUI;

    setuserfilter("All files (*.*)\0*.*\0\0");
    strncpy(buf, getenv("R_USER"), sizeof(buf)-1);
    buf[sizeof(buf)-1] = '\0';
    R_fixbackslash(buf);
    optf = askfilenamewithdir(G_("Select 'Rconsole' file"), "Rconsole", buf);
    if(!optf) return;

    getChoices(&newGUI);
    if (loadRconsole(&newGUI, optf)) {
        if (strlen(newGUI.warning)) askok(newGUI.warning);
	cleanup();
	showDialog(&newGUI);
    }
}

int loadRconsole(Gui gui, const char *optf)
{
    int ok, done, cfgerr;
    char *opt[2];

    if (!optopenfile(optf)) {
	return 0; /* this should not happen unless there are permission problems, etc */
    }
    cfgerr = 0;
    while ((ok = optread(opt, '='))) {
	done = 0;
	if (ok == 2) {
	    if (!strcmp(opt[0], "font")) {
		if(strlen(opt[1]) > 127) opt[1][127] = '\0';
		gui->tt_font = FALSE;
		{
		    const char *pf;
		    if ((strlen(opt[1]) > 1) &&
			(opt[1][0] == 'T') && (opt[1][1] == 'T')) {
			gui->tt_font = TRUE;
			for (pf = opt[1]+2; isspace(*pf) ; pf++);
		    } else pf = opt[1];
		    strncpy(gui->font, pf, sizeof(gui->font)-1);
		    gui->font[sizeof(gui->font)-1] = '\0';
		}
		done = 1;
	    }
	    if (!strcmp(opt[0], "points")) {
		gui->pointsize = atoi(opt[1]);
		done = 1;
	    }
	    if (!strcmp(opt[0], "style")) {
		strncpy(gui->style, opt[1], sizeof(gui->style)-1);
		gui->style[sizeof(gui->style)-1] = 0;
		done = 1;
	    }
	    if (!strcmp(opt[0], "rows")) {
		gui->crows = atoi(opt[1]);
		done = 1;
	    }
	    if (!strcmp(opt[0], "columns")) {
		gui->ccols = atoi(opt[1]);
		done = 1;
	    }
	    if (!strcmp(opt[0], "xconsole")) {
		gui->cx = atoi(opt[1]);
		done = 1;
	    }
	    if (!strcmp(opt[0], "yconsole")) {
		gui->cy = atoi(opt[1]);
		done = 1;
	    }
	    if (!strcmp(opt[0], "xgraphics")) {
		gui->grx = atoi(opt[1]);
		done = 1;
	    }
	    if (!strcmp(opt[0], "ygraphics")) {
		gui->gry = atoi(opt[1]);
		done = 1;
	    }
	    if (!strcmp(opt[0], "cursor_blink")) {
	    	int i;
	    	for (i = 0; i < 3; i++) {
	    	    if (!strcmp(opt[1], BlinkList[i])) {    	
	    		gui->cursor_blink = i;
	    		done = 1;
	    		break;
	    	    }
	    	}
	    }
	    if (!strcmp(opt[0], "pgrows")) {
		gui->prows = atoi(opt[1]);
		done = 1;
	    }
	    if (!strcmp(opt[0], "pgcolumns")) {
		gui->pcols = atoi(opt[1]);
		done = 1;
	    }
	    if (!strcmp(opt[0], "pagerstyle")) {
		if (!strcmp(opt[1], "singlewindow"))
		    gui->pagerMultiple = 0;
		else
		    gui->pagerMultiple = 1;
		done = 1;
	    }
	    if (!strcmp(opt[0], "bufbytes")) {
		gui->cbb = atoi(opt[1]);
		done = 1;
	    }
	    if (!strcmp(opt[0], "buflines")) {
		gui->cbl = atoi(opt[1]);
		done = 1;
	    }
#ifdef USE_MDI
	    if (!strcmp(opt[0], "MDI")) {
		if (!strcmp(opt[1], "yes"))
		    gui->MDI = 1;
		else if (!strcmp(opt[1], "no"))
		    gui->MDI = 0;
		done = 1;
	    }
	    if (!strcmp(opt[0], "toolbar")) {
		if (!strcmp(opt[1], "yes"))
		    gui->toolbar = 1;
		else if (!strcmp(opt[1], "no"))
		    gui->toolbar = 0;
		done = 1;
	    }
	    if (!strcmp(opt[0], "statusbar")) {
		if (!strcmp(opt[1], "yes"))
		    gui->statusbar = 1;
		else if (!strcmp(opt[1], "no"))
		    gui->statusbar = 0;
		done = 1;
	    }
	    if (!strcmp(opt[0], "MDIsize")) { /* wxh+x+y */
		int x=0, y=0, w=0, h=0, sign;
		char *p = opt[1];

		if(*p == '-') {sign = -1; p++;} else sign = +1;
		for(w=0; isdigit(*p); p++) w = 10*w + (*p - '0');
		w *= sign;
		p++;

		if(*p == '-') {sign = -1; p++;} else sign = +1;
		for(h=0; isdigit(*p); p++) h = 10*h + (*p - '0');
		h *= sign;

		if(*p == '-') sign = -1; else sign = +1;
		p++;
		for(x=0; isdigit(*p); p++) x = 10*x + (*p - '0');
		x *= sign;
		if(*p == '-') sign = -1; else sign = +1;
		p++;
		for(y=0; isdigit(*p); p++) y = 10*y + (*p - '0');
		y *= sign;

		gui->MDIsize = rect(x, y, w, h);

		done = 1;
	    }
#endif
	    for (int i=0; i<numGuiColors; i++) 
		if (!strcmp(opt[0], GuiElementNames[i])) {
		    if (!strcmpi(opt[1], "Windows"))
			gui->guiColors[i] = myGetSysColor(COLOR_WINDOW);
		    else gui->guiColors[i] = nametorgb(opt[1]);
		    if (gui->guiColors[i] != Transparent)
		    	done = 1;
		}
	    if (!strcmp(opt[0], "setwidthonresize")) {
		if (!strcmp(opt[1], "yes"))
		    gui->setWidthOnResize = 1;
		else if (!strcmp(opt[1], "no"))
		    gui->setWidthOnResize = 0;
		done = 1;
	    }
	    if (!strcmp(opt[0], "language")) {
		strncpy(gui->language, opt[1], sizeof(gui->language)-1);
		gui->language[sizeof(gui->language)-1] = '\0';
		done = 1;
	    }
	    if (!strcmp(opt[0], "buffered")) {
		if (!strcmp(opt[1], "yes"))
		    gui->buffered = 1;
		else if (!strcmp(opt[1], "no"))
		    gui->buffered = 0;
		done = 1;
	    }
	} else if (ok == 3) { /* opt[1] == "" */
	    if (!strcmp(opt[0], "language")) {
		strcpy(gui->language, opt[1]);
		done = 1;
	    }
	}
	if (!done) 
	    snprintf(gui->warning, sizeof(gui->warning), 
	             G_("Ignored '%s' at line %d of file %s"), 
	                opt[0], optline(), optfile());
    }
    return !cfgerr;
}

static void apply(button b) /* button callback */
{
    do_apply(); /* to be used outside button callbacks */
}

static void cancel(button b)
{
    cleanup();
    show(RConsole);
}

static void ok(button b)
{
    do_apply();
    cleanup();
    show(RConsole);
}

static void cMDI(button b)
{
    enable(toolbar);
    enable(statusbar);
}

static void cSDI(button b)
{
    disable(toolbar);
    disable(statusbar);
}

static rgb whichbg[numGuiColors] = { consolebg, consolebg, consolebg,
                                     pagerbg, pagerbg, pagerbg,
                                     dataeditbg, dataeditbg, dataeditbg,
                                     editorbg, editorbg };
static rgb whichfg[numGuiColors] = { consolefg, consolefg, consoleuser,
				     pagerfg, pagerfg, pagerhighlight,
				     dataeditfg, dataeditfg, dataedituser,
				     editorfg, editorfg };
static void clickColor(control c, int argument)
{
    int element = cmatch(gettext(guielement), GuiElementNames);
    dialogColors[element] = nametorgb(ColorName[argument]);
    setforeground(guisample, dialogColors[whichfg[element]]);
    setbackground(guisample, dialogColors[whichbg[element]]);
}

static void changeElement(control c, int argument)
{   
    int newcolor = rgbtonum(dialogColors[argument]);
    setlistitem(guicolor, newcolor);
    clickColor(guicolor, newcolor);
}

static void changeFont(control c)
{
    char fontname[LF_FACESIZE+4];
    
    if (samplefont) delobj(samplefont);
    
    if(ischecked(tt_font)) strcpy(fontname, "TT "); else strcpy(fontname, "");
    
    if (sampleFontNum >= 0) {
    	strcat(fontname,  FontsList[sampleFontNum]);
    } else 
    	strcat(fontname, gettext(f_font));
    
    samplefont = gnewfont(NULL, fontname, sampleStyle, samplePointsize, 0.0, 1);
    settextfont(guisample, samplefont);
    clickColor(c, getlistitem(guicolor));
}

static void scrollFont(scrollbar s, int position)
{
    sampleFontNum = position;
    changeFont(s);
}

static void scrollPoints(scrollbar s, int position)
{
    samplePointsize = atoi(PointsList[position]);
    changeFont(s);
}

static void scrollStyle(scrollbar s, int position)
{
    sampleStyle = Plain;
    if (!strcmp(gettext(f_style), "bold")) sampleStyle = Bold;
    if (!strcmp(gettext(f_style), "italic")) sampleStyle = Italic;    
    changeFont(s);
}

static void showDialog(Gui gui)
{
    char buf[100];

    wconfig = newwindow(G_("Rgui Configuration Editor"), rect(0, 0, 550, 450),
			Titlebar | Centered | Modal);
    setbackground(wconfig, dialog_bg());
    l_mdi = newlabel("Single or multiple windows",
		     rect(10, 10, 140, 20), AlignLeft);
    rb_mdi = newradiobutton("MDI", rect(150, 10 , 70, 20), cMDI);
    rb_sdi = newradiobutton("SDI", rect(220, 10 , 70, 20), cSDI);


    toolbar = newcheckbox("MDI toolbar", rect(300, 10, 100, 20), NULL);
    if(gui->toolbar) check(toolbar);
    statusbar = newcheckbox("MDI statusbar", rect(420, 10, 130, 20), NULL);
    if(gui->statusbar) check(statusbar);
    if(gui->MDI) {
	check(rb_mdi); cMDI(rb_mdi);
    } else {
	check(rb_sdi); cSDI(rb_sdi);
    }

    l_mwin = newlabel("Pager style", rect(10, 40, 90, 20), AlignLeft);
    g_mwin = newradiogroup();
    rb_mwin = newradiobutton("multiple windows", rect(150, 40, 150, 20), NULL);
    rb_swin = newradiobutton("single window", rect(150, 60 , 150, 20), NULL);
    if(gui->pagerMultiple) check(rb_mwin); else check(rb_swin);

    l_lang = newlabel("Language for menus\nand messages",
		      rect(320, 40, 130, 40), AlignLeft);
    f_lang = newfield(gui->language, rect(450, 45, 60, 20));

/* Font, pointsize, style */

    l_font = newlabel("Font", rect(10, 100, 40, 20), AlignLeft);

    f_font = newdropfield(FontsList, rect(50, 100, 120, 20), scrollFont);
    tt_font = newcheckbox("TrueType only", rect(180, 100, 110, 20), changeFont);
    if (gui->tt_font) check(tt_font);
    settext(f_font, gui->font);

    l_point = newlabel("size", rect(310, 100, 30, 20), AlignLeft);
    d_point = newdropfield(PointsList, rect(345, 100, 50, 20), scrollPoints);
    snprintf(buf, 100, "%d", gui->pointsize);
    settext(d_point, buf);
    l_style = newlabel("style", rect(410, 100, 40, 20), AlignLeft);
    f_style = newdroplist(StyleList, rect(450, 100, 80, 20), scrollStyle);
    setlistitem(f_style, cmatch(gui->style, StyleList));

/* Console size, set widthonresize */
    l_crows = newlabel("Console   rows", rect(10, 150, 100, 20), AlignLeft);
    snprintf(buf, 100, "%d", gui->crows);
    f_crows = newfield(buf, rect(110, 150, 30, 20));
    l_ccols = newlabel("columns", rect(150, 150, 60, 20), AlignLeft);
    snprintf(buf, 100, "%d", gui->ccols);
    f_ccols = newfield(buf, rect(220, 150, 30, 20));
    l_cx = newlabel("Initial left", rect(270, 150, 70, 20), AlignLeft);
    snprintf(buf, 100, "%d", gui->cx);
    f_cx = newfield(buf, rect(350, 150, 40, 20));
    l_cy = newlabel("top", rect(430, 150, 30, 20), AlignLeft);
    snprintf(buf, 100, "%d", gui->cy);
    f_cy = newfield(buf, rect(480, 150, 40, 20));

    c_resize = newcheckbox("set options(width) on resize?",
			   rect(20, 175, 200, 20), NULL);
    if(gui->setWidthOnResize) check(c_resize);

    l_cbb = newlabel("buffer chars", rect(270, 175, 70, 20), AlignLeft);
    snprintf(buf, 100, "%d", gui->cbb);
    f_cbb = newfield(buf, rect(350, 175, 60, 20));
    l_cbl = newlabel("lines", rect(430, 175, 50, 20), AlignLeft);
    snprintf(buf, 100, "%d", gui->cbl);
    f_cbl = newfield(buf, rect(480, 175, 40, 20));

    c_buff = newcheckbox("buffer console by default?",
			 rect(20, 190, 200, 20), NULL);
    if(gui->buffered) check(c_buff);

/* Cursor blink */

    l_blink = newlabel("Cursor blink", rect(270, 200,100, 30), AlignLeft);
    f_blink = newdroplist(BlinkList, rect(350, 200, 80, 20), NULL);
    setlistitem(f_blink, gui->cursor_blink);
    
/* Pager size */
    l_prows = newlabel("Pager   rows", rect(10, 230, 100, 20), AlignLeft);
    snprintf(buf, 100, "%d", gui->prows);
    f_prows = newfield(buf, rect(110, 230, 30, 20));
    l_pcols = newlabel("columns", rect(150, 230, 60, 20), AlignLeft);
    snprintf(buf, 100, "%d", gui->pcols);
    f_pcols = newfield(buf, rect(220, 230, 30, 20));

/* Graphics window */
    l_grx = newlabel("Graphics windows: initial left",
		     rect(10, 270, 190, 20), AlignLeft);
    snprintf(buf, 100, "%d", gui->grx);
    f_grx = newfield(buf, rect(200, 270, 40, 20));
    l_gry = newlabel("top", rect(270, 270, 30, 20), AlignLeft);
    snprintf(buf, 100, "%d", gui->gry);
    f_gry = newfield(buf, rect(300, 270, 40, 20));

/* Font colours */
    l_cols = newlabel("Console and Pager Colours",
		      rect(10, 310, 520, 20), AlignCenter);
			      
    guielement = newlistbox(GuiElementNames, rect(50, 330, 100, 80), changeElement, NULL);
    guicolor = newlistbox(ColorName, rect(205, 330, 100, 80), clickColor, NULL);
    guisample = newrichtextarea("Sample text", rect(350, 330, 150, 55));
	
    for (int i=0; i<numGuiColors; i++)
    	dialogColors[i] = gui->guiColors[i];
    	
    setlistitem(guielement, 0);
    changeElement(guielement, 0);
    sampleFontNum = cmatch(gettext(f_font), FontsList);
    samplePointsize = atoi(gettext(d_point));
    scrollStyle(f_style, 0); /* the 0 is ignored */

    bApply = newbutton("Apply", rect(50, 410, 70, 25), apply);
    bSave = newbutton("Save...", rect(130, 410, 70, 25), save);
    bLoad = newbutton("Load...", rect(210, 410, 70, 25), load);
    bOK = newbutton("OK", rect(350, 410, 70, 25), ok);
    bCancel = newbutton("Cancel", rect(430, 410, 70, 25), cancel);
    show(wconfig);
}

void Rgui_configure()
{
    struct structGUI curGUI;

    getActive(&curGUI);
    showDialog(&curGUI);
}