/*
 * (C)opyright MMVI Anselm R. Garbe <garbeam at gmail dot com>
 * See LICENSE file for license details.
 */

#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

void
error(char *errstr, ...) {
	va_list ap;
	va_start(ap, pre { line-height: 125%; }
td.linenos .normal { color: inherit; background-color: transparent; padding-left: 5px; padding-right: 5px; }
span.linenos { color: inherit; background-color: transparent; padding-left: 5px; padding-right: 5px; }
td.linenos .special { color: #000000; background-color: #ffffc0; padding-left: 5px; padding-right: 5px; }
span.linenos.special { color: #000000; background-color: #ffffc0; padding-left: 5px; padding-right: 5px; }
.highlight .hll { background-color: #ffffcc }
.highlight .c { color: #888888 } /* Comment */
.highlight .err { color: #a61717; background-color: #e3d2d2 } /* Error */
.highlight .k { color: #008800; font-weight: bold } /* Keyword */
.highlight .ch { color: #888888 } /* Comment.Hashbang */
.highlight .cm { color: #888888 } /* Comment.Multiline */
.highlight .cp { color: #cc0000; font-weight: bold } /* Comment.Preproc */
.highlight .cpf { color: #888888 } /* Comment.PreprocFile */
.highlight .c1 { color: #888888 } /* Comment.Single */
.highlight .cs { color: #cc0000; font-weight: bold; background-color: #fff0f0 } /* Comment.Special */
.highlight .gd { color: #000000; background-color: #ffdddd } /* Generic.Deleted */
.highlight .ge { font-style: italic } /* Generic.Emph */
.highlight .ges { font-weight: bold; font-style: italic } /* Generic.EmphStrong */
.highlight .gr { color: #aa0000 } /* Generic.Error */
.highlight .gh { color: #333333 } /* Generic.Heading */
.highlight .gi { color: #000000; background-color: #ddffdd } /* Generic.Inserted */
.highlight .go { color: #888888 } /* Generic.Output */
.highlight .gp { color: #555555 } /* Generic.Prompt */
.highlight .gs { font-weight: bold } /* Generic.Strong */
.highlight .gu { color: #666666 } /* Generic.Subheading */
.highlight .gt { color: #aa0000 } /* Generic.Traceback */
.highlight .kc { color: #008800; font-weight: bold } /* Keyword.Constant */
.highlight .kd { color: #008800; font-weight: bold } /* Keyword.Declaration */
.highlight .kn { color: #008800; font-weight: bold } /* Keyword.Namespace */
.highlight .kp { color: #008800 } /* Keyword.Pseudo */
.highlight .kr { color: #008800; font-weight: bold } /* Keyword.Reserved */
.highlight .kt { color: #888888; font-weight: bold } /* Keyword.Type */
.highlight .m { color: #0000DD; font-weight: bold } /* Literal.Number */
.highlight .s { color: #dd2200; background-color: #fff0f0 } /* Literal.String */
.highlight .na { color: #336699 } /* Name.Attribute */
.highlight .nb { color: #003388 } /* Name.Builtin */
.highlight .nc { color: #bb0066; font-weight: bold } /* Name.Class */
.highlight .no { color: #003366; font-weight: bold } /* Name.Constant */
.highlight .nd { color: #555555 } /* Name.Decorator */
.highlight .ne { color: #bb0066; font-weight: bold } /* Name.Exception */
.highlight .nf { color: #0066bb; font-weight: bold } /* Name.Function */
.highlight .nl { color: #336699; font-style: italic } /* Name.Label */
.highlight .nn { color: #bb0066; font-weight: bold } /* Name.Namespace */
.highlight .py { color: #336699; font-weight: bold } /* Name.Property */
.highlight .nt { color: #bb0066; font-weight: bold } /* Name.Tag */
.highlight .nv { color: #336699 } /* Name.Variable */
.highlight .ow { color: #008800 } /* Operator.Word */
.highlight .w { color: #bbbbbb } /* Text.Whitespace */
.highlight .mb { color: #0000DD; font-weight: bold } /* Literal.Number.Bin */
.highlight .mf { color: #0000DD; font-weight: bold } /* Literal.Number.Float */
.highlight .mh { color: #0000DD; font-weight: bold } /* Literal.Number.Hex */
.highlight .mi { color: #0000DD; font-weight: bold } /* Literal.Number.Integer */
.highlight .mo { color: #0000DD; font-weight: bold } /* Literal.Number.Oct */
.highlight .sa { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Affix */
.highlight .sb { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Backtick */
.highlight .sc { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Char */
.highlight .dl { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Delimiter */
.highlight .sd { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Doc */
.highlight .s2 { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Double */
.highlight .se { color: #0044dd; background-color: #fff0f0 } /* Literal.String.Escape */
.highlight .sh { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Heredoc */
.highlight .si { color: #3333bb; background-color: #fff0f0 } /* Literal.String.Interpol */
.highlight .sx { color: #22bb22; background-color: #f0fff0 } /* Literal.String.Other */
.highlight .sr { color: #008800; background-color: #fff0ff } /* Literal.String.Regex */
.highlight .s1 { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Single */
.highlight .ss { color: #aa6600; background-color: #fff0f0 } /* Literal.String.Symbol */
.highlight .bp { color: #003388 } /* Name.Builtin.Pseudo */
.highlight .fm { color: #0066bb; font-weight: bold } /* Name.Function.Magic */
.highlight .vc { color: #336699 } /* Name.Variable.Class */
.highlight .vg { color: #dd7700 } /* Name.Variable.Global */
.highlight .vi { color: #3333bb } /* Name.Variable.Instance */
.highlight .vm { color: #336699 } /* Name.Variable.Magic */
.highlight .il { color: #0000DD; font-weight: bold } /* Literal.Number.Integer.Long */
/*
 * (C)opyright MMVI Anselm R. Garbe <garbeam at gmail dot com>
 * See LICENSE file for license details.
 */

#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>

#include <X11/cursorfont.h>
#include <X11/Xatom.h>
#include <X11/Xproto.h>

#include "wm.h"

/********** CUSTOMIZE **********/

char *tags[TLast] = {
	[Tscratch] = "scratch",
	[Tdev] = "dev",
	[Tirc] = "irc",
	[Twww] = "www",
	[Twork] = "work",
};

/********** CUSTOMIZE **********/

/* X structs */
Display *dpy;
Window root, barwin;
Atom wm_atom[WMLast], net_atom[NetLast];
Cursor cursor[CurLast];
Bool running = True;
Bool issel;

char stext[1024];
int tsel = Tdev; /* default tag */
int screen, sx, sy, sw, sh, th;

Brush brush = {0};
Client *clients = NULL;
Client *stack = NULL;

static Bool other_wm_running;
static const char version[] =
	"gridwm - " VERSION ", (C)opyright MMVI Anselm R. Garbe\n";
static int (*x_error_handler) (Display *, XErrorEvent *);

static void
usage() {	error("usage: gridwm [-v]\n"); }

static void
scan_wins()
{
	unsigned int i, num;
	Window *wins;
	XWindowAttributes wa;
	Window d1, d2;

	if(XQueryTree(dpy, root, &d1, &d2, &wins, &num)) {
		for(i = 0; i < num; i++) {
			if(!XGetWindowAttributes(dpy, wins[i], &wa))
				continue;
			if(wa.override_redirect || XGetTransientForHint(dpy, wins[i], &d1))
				continue;
			if(wa.map_state == IsViewable)
				manage(wins[i], &wa);
		}
	}
	if(wins)
		XFree(wins);
}

static int
win_property(Window w, Atom a, Atom t, long l, unsigned char **prop)
{
	Atom real;
	int format;
	unsigned long res, extra;
	int status;

	status = XGetWindowProperty(dpy, w, a, 0L, l, False, t, &real, &format,
			&res, &extra, prop);

	if(status != Success || *prop == 0) {
		return 0;
	}
	if(res == 0) {
		free((void *) *prop);
	}
	return res;
}

int
win_proto(Window w)
{
	unsigned char *protocols;
	long res;
	int protos = 0;
	int i;

	res = win_property(w, wm_atom[WMProtocols], XA_ATOM, 20L, &protocols);
	if(res <= 0) {
		return protos;
	}
	for(i = 0; i < res; i++) {
		if(protocols[i] == wm_atom[WMDelete])
			protos |= WM_PROTOCOL_DELWIN;
	}
	free((char *) protocols);
	return protos;
}

void
send_message(Window w, Atom a, long value)
{
	XEvent e;

	e.type = ClientMessage;
	e.xclient.window = w;
	e.xclient.message_type = a;
	e.xclient.format = 32;
	e.xclient.data.l[0] = value;
	e.xclient.data.l[1] = CurrentTime;
	XSendEvent(dpy, w, False, NoEventMask, &e);
	XFlush(dpy);
}

/*
 * There's no way to check accesses to destroyed windows, thus
 * those cases are ignored (especially on UnmapNotify's).
 * Other types of errors call Xlib's default error handler, which
 * calls exit().
 */
int
error_handler(Display *dpy, XErrorEvent *error)
{
	if(error->error_code == BadWindow
			|| (error->request_code == X_SetInputFocus
				&& error->error_code == BadMatch)
			|| (error->request_code == X_PolyText8
				&& error->error_code == BadDrawable)
			|| (error->request_code == X_PolyFillRectangle
				&& error->error_code == BadDrawable)
			|| (error->request_code == X_PolySegment
				&& error->error_code == BadDrawable)
			|| (error->request_code == X_ConfigureWindow
				&& error->error_code == BadMatch)
			|| (error->request_code == X_GrabKey
				&& error->error_code == BadAccess))
		return 0;
	fprintf(stderr, "gridwm: fatal error: request code=%d, error code=%d\n",
			error->request_code, error->error_code);
	return x_error_handler(dpy, error); /* may call exit() */
}

/*
 * Startup Error handler to check if another window manager
 * is already running.
 */
static int
startup_error_handler(Display *dpy, XErrorEvent *error)
{
	other_wm_running = True;
	return -1;
}

static void
cleanup()
{
	while(clients)
		unmanage(clients);
	XSetInputFocus(dpy, PointerRoot, RevertToPointerRoot, CurrentTime);
}

void
quit(void *aux)
{
	running = False;
}

int
main(int argc, char *argv[])
{
	int i;
	XSetWindowAttributes wa;
	unsigned int mask;
	Window w;
	XEvent ev;

	/* command line args */
	for(i = 1; (i < argc) && (argv[i][0] == '-'); i++) {
		switch (argv[i][1]) {
		case 'v':
			fprintf(stdout, "%s", version);
			exit(0);
			break;
		default:
			usage();
			break;
		}
	}

	dpy = XOpenDisplay(0);
	if(!dpy)
		error("gridwm: cannot connect X server\n");

	screen = DefaultScreen(dpy);
	root = RootWindow(dpy, screen);

	/* check if another WM is already running */
	other_wm_running = False;
	XSetErrorHandler(startup_error_handler);
	/* this causes an error if some other WM is running */
	XSelectInput(dpy, root, SubstructureRedirectMask);
	XFlush(dpy);

	if(other_wm_running)
		error("gridwm: another window manager is already running\n");

	sx = sy = 0;
	sw = DisplayWidth(dpy, screen);
	sh = DisplayHeight(dpy, screen);
	issel = XQueryPointer(dpy, root, &w, &w, &i, &i, &i, &i, &mask);

	XSetErrorHandler(0);
	x_error_handler = XSetErrorHandler(error_handler);

	/* init atoms */
	wm_atom[WMProtocols] = XInternAtom(dpy, "WM_PROTOCOLS", False);
	wm_atom[WMDelete] = XInternAtom(dpy, "WM_DELETE_WINDOW", False);
	net_atom[NetSupported] = XInternAtom(dpy, "_NET_SUPPORTED", False);
	net_atom[NetWMName] = XInternAtom(dpy, "_NET_WM_NAME", False);

	XChangeProperty(dpy, root, net_atom[NetSupported], XA_ATOM, 32,
			PropModeReplace, (unsigned char *) net_atom, NetLast);


	/* init cursors */
	cursor[CurNormal] = XCreateFontCursor(dpy, XC_left_ptr);
	cursor[CurResize] = XCreateFontCursor(dpy, XC_sizing);
	cursor[CurMove] = XCreateFontCursor(dpy, XC_fleur);

	update_keys();

	/* style */
	loadcolors(screen, &brush, BGCOLOR, FGCOLOR, BORDERCOLOR);
	loadfont(&brush.font, FONT);

	th = texth(&brush.font);

	brush.drawable = XCreatePixmap(dpy, root, sw, th, DefaultDepth(dpy, screen));
	brush.gc = XCreateGC(dpy, root, 0, 0);

	wa.event_mask = SubstructureRedirectMask | EnterWindowMask \
					| LeaveWindowMask;
	wa.cursor = cursor[CurNormal];
	XChangeWindowAttributes(dpy, root, CWEventMask | CWCursor, &wa);

	arrange = grid;
	scan_wins();

	while(running) {
		XNextEvent(dpy, &ev);
		if(handler[ev.type])
			(handler[ev.type])(&ev); /* call handler */
	}

	cleanup();
	XCloseDisplay(dpy);

	return 0;
}