/* (C)opyright MMVI-MMVII Anselm R. Garbe <garbeam at gmail dot com>

 * See LICENSE file for license details.

 */

#include "dwm.h"

#include <errno.h>

#include <locale.h>

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include <unistd.h>

#include <sys/select.h>

#include <X11/cursorfont.h>

#include <X11/keysym.h>

#include <X11/Xatom.h>

#include <X11/Xproto.h>

/* extern */

char stext[256];

int bh, bmw, screen, sx, sy, sw, sh, wax, way, waw, wah;

Atom wmatom[WMLast], netatom[NetLast];

Bool running = True;

Bool *seltag;

Bool selscreen = True;

Client *clients = NULL;

Client *sel = NULL;

Client *stack = NULL;

Cursor cursor[CurLast];

Display *dpy;

DC dc = {0};

Window root, barwin;

/* static */

static int (*xerrorxlib)(Display *, XErrorEvent *);

static Bool otherwm, readin;

static void

cleanup(void) {

	close(STDIN_FILENO);

	while(stack) {

		if(stack->isbanned)

			XMoveWindow(dpy, stack->win, stack->x, stack->y);

		unmanage(stack);

	}

	if(dc.font.set)

		XFreeFontSet(dpy, dc.font.set);

	else

		XFreeFont(dpy, dc.font.xfont);

	XUngrabKey(dpy, AnyKey, AnyModifier, root);

	XFreePixmap(dpy, dc.drawable);

	XFreeGC(dpy, dc.gc);

	XDestroyWindow(dpy, barwin);

	XFreeCursor(dpy, cursor[CurNormal]);

	XFreeCursor(dpy, cursor[CurResize]);

	XFreeCursor(dpy, cursor[CurMove]);

	XSetInputFocus(dpy, PointerRoot, RevertToPointerRoot, CurrentTime);

	XSync(dpy, False);

	free(seltag);

}

static void

scan(void) {

	unsigned int i, num;

	Window *wins, d1, d2;

	XWindowAttributes wa;

	wins = NULL;

	if(XQueryTree(dpy, root, &d1, &d2, &wins, &num)) {

		for(i = 0; i < num; i++) {

			if(!XGetWindowAttributes(dpy, wins[i], &wa)

			|| wa.override_redirect || XGetTransientForHint(dpy, wins[i], &d1))

				continue;

			if(wa.map_state == IsViewable)

				manage(wins[i], &wa);

		}

	}

	if(wins)

		XFree(wins);

}

static void

setup(void) {

	int i, j;

	unsigned int mask;

	Window w;

	XModifierKeymap *modmap;

	XSetWindowAttributes wa;

	/* init atoms */

	wmatom[WMProtocols] = XInternAtom(dpy, "WM_PROTOCOLS", False);

	wmatom[WMDelete] = XInternAtom(dpy, "WM_DELETE_WINDOW", False);

	wmatom[WMState] = XInternAtom(dpy, "WM_STATE", False);

	netatom[NetSupported] = XInternAtom(dpy, "_NET_SUPPORTED", False);

	netatom[NetWMName] = XInternAtom(dpy, "_NET_WM_NAME", False);

	XChangeProperty(dpy, root, netatom[NetSupported], XA_ATOM, 32,

			PropModeReplace, (unsigned char *) netatom, NetLast);

	/* init cursors */

	cursor[CurNormal] = XCreateFontCursor(dpy, XC_left_ptr);

	cursor[CurResize] = XCreateFontCursor(dpy, XC_sizing);

	cursor[CurMove] = XCreateFontCursor(dpy, XC_fleur);

	/* init modifier map */

	numlockmask = 0;

	modmap = XGetModifierMapping(dpy);

	for (i = 0; i < 8; i++)

		for (j = 0; j < modmap->max_keypermod; j++) {

			if(modmap->modifiermap[i * modmap->max_keypermod + j]

					== XKeysymToKeycode(dpy, XK_Num_Lock))

				numlockmask = (1 << i);

		}

	XFreeModifiermap(modmap);

	/* select for events */

	wa.event_mask = SubstructureRedirectMask | SubstructureNotifyMask

		| EnterWindowMask | LeaveWindowMask;

	wa.cursor = cursor[CurNormal];

	XChangeWindowAttributes(dpy, root, CWEventMask | CWCursor, &wa);

	grabkeys();

	compileregexps();

	for(ntags = 0; tags[ntags]; ntags++);

	seltag = emallocz(sizeof(Bool) * ntags);

	seltag[0] = True;

	/* style */

	dc.norm[ColBorder] = getcolor(NORMBORDERCOLOR);

	dc.norm[ColBG] = getcolor(NORMBGCOLOR);

	dc.norm[ColFG] = getcolor(NORMFGCOLOR);

	dc.sel[ColBorder] = getcolor(SELBORDERCOLOR);

	dc.sel[ColBG] = getcolor(SELBGCOLOR);

	dc.sel[ColFG] = getcolor(SELFGCOLOR);

	setfont(FONT);

	/* geometry */

	sx = sy = 0;

	sw = DisplayWidth(dpy, screen);

	sh = DisplayHeight(dpy, screen);

	bmw = textw(TILESYMBOL) > textw(FLOATSYMBOL) ? textw(TILESYMBOL) : textw(FLOATSYMBOL);

	/* bar */

	dc.h = bh = dc.font.height + 2;

	wa.override_redirect = 1;

	wa.background_pixmap = ParentRelative;

	wa.event_mask = ButtonPressMask | ExposureMask;

	barwin = XCreateWindow(dpy, root, sx, sy + (TOPBAR ? 0 : sh - bh), sw, bh, 0,

			DefaultDepth(dpy, screen), CopyFromParent, DefaultVisual(dpy, screen),

			CWOverrideRedirect | CWBackPixmap | CWEventMask, &wa);

	XDefineCursor(dpy, barwin, cursor[CurNormal]);

	XMapRaised(dpy, barwin);

	strcpy(stext, "dwm-"VERSION);

	/* windowarea */

	wax = sx;

	way = sy + (TOPBAR ? bh : 0);

	wah = sh - bh;

	waw = sw;

	/* pixmap for everything */

	dc.drawable = XCreatePixmap(dpy, root, sw, bh, DefaultDepth(dpy, screen));

	dc.gc = XCreateGC(dpy, root, 0, 0);

	XSetLineAttributes(dpy, dc.gc, 1, LineSolid, CapButt, JoinMiter);

	/* multihead support */

	selscreen = XQueryPointer(dpy, root, &w, &w, &i, &i, &i, &i, &mask);

}

/*

 * Startup Error handler to check if another window manager

 * is already running.

 */

static int

xerrorstart(Display *dsply, XErrorEvent *ee) {

	otherwm = True;

	return -1;

}

/* extern */

void

sendevent(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);

	XSync(dpy, False);

}

void

quit(Arg *arg) {

	readin = running = False;

}

/* There's no way to check accesses to destroyed windows, thus those cases are

 * ignored (especially on UnmapNotify's).  Other types of errors call Xlibs

 * default error handler, which may call exit.

 */

int

xerror(Display *dpy, XErrorEvent *ee) {

	if(ee->error_code == BadWindow

	|| (ee->request_code == X_SetInputFocus && ee->error_code == BadMatch)

	|| (ee->request_code == X_PolyText8 && ee->error_code == BadDrawable)

	|| (ee->request_code == X_PolyFillRectangle && ee->error_code == BadDrawable)

	|| (ee->request_code == X_PolySegment && ee->error_code == BadDrawable)

	|| (ee->request_code == X_ConfigureWindow && ee->error_code == BadMatch)

	|| (ee->request_code == X_GrabKey && ee->error_code == BadAccess)

	|| (ee->request_code == X_CopyArea && ee->error_code == BadDrawable))

		return 0;

	fprintf(stderr, "dwm: fatal error: request code=%d, error code=%d\n",

		ee->request_code, ee->error_code);

	return xerrorxlib(dpy, ee); /* may call exit */

}

int

main(int argc, char *argv[]) {

	char *p;

	int r, xfd;

	fd_set rd;

	if(argc == 2 && !strncmp("-v", argv[1], 3)) {

		fputs("dwm-"VERSION", (C)opyright MMVI-MMVII Anselm R. Garbe\n", stdout);

		exit(EXIT_SUCCESS);

	}

	else if(argc != 1)

		eprint("usage: dwm [-v]\n");

	setlocale(LC_CTYPE, "");

	dpy = XOpenDisplay(0);

	if(!dpy)

		eprint("dwm: cannot open display\n");

	xfd = ConnectionNumber(dpy);

	screen = DefaultScreen(dpy);

	root = RootWindow(dpy, screen);

	otherwm = False;

	XSetErrorHandler(xerrorstart);

	/* this causes an error if some other window manager is running */

	XSelectInput(dpy, root, SubstructureRedirectMask);

	XSync(dpy, False);

	if(otherwm)

		eprint("dwm: another window manager is already running\n");

	XSync(dpy, False);

	XSetErrorHandler(NULL);

	xerrorxlib = XSetErrorHandler(xerror);

	XSync(dpy, False);

	setup();

	drawstatus();

	scan();

	/* main event loop, also reads status text from stdin */

	XSync(dpy, False);

	procevent();

	readin = True;

	while(running) {

		FD_ZERO(&rd);

		if(readin)

			FD_SET(STDIN_FILENO, &rd);

		FD_SET(xfd, &rd);

		if(select(xfd + 1, &rd, NULL, NULL, NULL) == -1) {

			if(errno == EINTR)

				continue;

			eprint("select failed\n");

		}

		if(FD_ISSET(STDIN_FILENO, &rd)) {

			switch(r = read(STDIN_FILENO, stext, sizeof stext - 1)) {

			case -1:

				strncpy(stext, strerror(errno), sizeof stext - 1);

				stext[sizeof stext - 1] = '\0';

				readin = False;

				break;

			case 0:

				strncpy(stext, "EOF", 4);

				readin = False;

				break;

			default:

				for(stext[r] = '\0', p = stext + strlen(stext) - 1; p >= stext && *p == '\n'; *p-- = '\0');

				for(; p >= stext && *p != '\n'; --p);

				if(p > stext)

					strncpy(stext, p + 1, sizeof stext);

			}

			drawstatus();

		}

		if(FD_ISSET(xfd, &rd))

			procevent();

	}

	cleanup();

	XCloseDisplay(dpy);

	return 0;

}