/* See LICENSE file for copyright and license details. */
#include "dwm.h"
#include <stdlib.h>
#include <X11/keysym.h>
#include <X11/Xatom.h>
#include <X11/Xutil.h>

/* static */

typedef struct {
	unsigned long mod;
	KeySym keysym;
	void (*func)(const char *arg);
	const char *arg;
} Key;

#define CLEANMASK(mask)		(mask & ~(numlockmask | LockMask))
#define MOUSEMASK		(BUTTONMASK | PointerMotionMask)

static Client *
getclient(Window w) {
	Client *c;

	for(c = clients; c && c->win != w; c = c->next);
	return c;
}

static void
movemouse(Client *c) {
	int x1, y1, ocx, ocy, di, nx, ny;
	unsigned int dui;
	Window dummy;
	XEvent ev;

	ocx = nx = c->x;
	ocy = ny = c->y;
	if(XGrabPointer(dpy, root, False, MOUSEMASK, GrabModeAsync, GrabModeAsync,
			None, cursor[CurMove], CurrentTime) != GrabSuccess)
		return;
	c->ismax = False;
	XQueryPointer(dpy, root, &dummy, &dummy, &x1, &y1, &di, &di, &dui);
	for(;;) {
		XMaskEvent(dpy, MOUSEMASK | ExposureMask | SubstructureRedirectMask, &ev);
		switch (ev.type) {
		case ButtonRelease:
			XUngrabPointer(dpy, CurrentTime);
			return;
		case ConfigureRequest:
		case Expose:
		case MapRequest:
			handler[ev.type](&ev);
			break;
		case MotionNotify:
			XSync(dpy, False);
			nx = ocx + (ev.xmotion.x - x1);
			ny = ocy + (ev.xmotion.y - y1);
			if(abs(wax + nx) < SNAP)
				nx = wax;
			else if(abs((wax + waw) - (nx + c->w + 2 * c->border)) < SNAP)
				nx = wax + waw - c->w - 2 * c->border;
			if(abs(way - ny) < SNAP)
				ny = way;
			else if(abs((way + wah) - (ny + c->h + 2 * c->border)) < SNAP)
				ny = way + wah - c->h - 2 * c->border;
			resize(c, nx, ny, c->w, c->h, False);
			break;
		}
	}
}

static void
resizemouse(Client *c) {
	int ocx, ocy;
	int nw, nh;
	XEvent ev;

	ocx = c->x;
	ocy = c->y;
	if(XGrabPointer(dpy, root, False, MOUSEMASK, GrabModeAsync, GrabModeAsync,
			None, cursor[CurResize], CurrentTime) != GrabSuccess)
		return;
	c->ismax = False;
	XWarpPointer(dpy, None, c->win, 0, 0, 0, 0, c->w + c->border - 1, c->h + c->border - 1);
	for(;;) {
		XMaskEvent(dpy, MOUSEMASK | ExposureMask | SubstructureRedirectMask , &ev);
		switch(ev.type) {
		case ButtonRelease:
			XWarpPointer(dpy, None, c->win, 0, 0, 0, 0,
					c->w + c->border - 1, c->h + c->border - 1);
			XUngrabPointer(dpy, CurrentTime);
			while(XCheckMaskEvent(dpy, EnterWindowMask, &ev));
			return;
		case ConfigureRequest:
		case Expose:
		case MapRequest:
			handler[ev.type](&ev);
			break;
		case MotionNotify:
			XSync(dpy, False);
			if((nw = ev.xmotion.x - ocx - 2 * c->border + 1) <= 0)
				nw = 1;
			if((nh = ev.xmotion.y - ocy - 2 * c->border + 1) <= 0)
				nh = 1;
			resize(c, c->x, c->y, nw, nh, True);
			break;
		}
	}
}

static void
buttonpress(XEvent *e) {
	unsigned int i, x;
	Client *c;
	XButtonPressedEvent *ev = &e->xbutton;

	if(barwin == ev->window) {
		x = 0;
		for(i = 0; i < ntags; i++) {
			x += textw(tags[i]);
			if(ev->x < x) {
				if(ev->button == Button1) {
					if(ev->state & MODKEY)
						tag(tags[i]);
					else
						view(tags[i]);
				}
				else if(ev->button == Button3) {
					if(ev->state & MODKEY)
						toggletag(tags[i]);
					else
						toggleview(tags[i]);
				}
				return;
			}
		}
		if((ev->x < x + blw) && ev->button == Button1)
			setlayout(NULL);
	}
	else if((c = getclient(ev->window))) {
		focus(c);
		if(CLEANMASK(ev->state) != MODKEY)
			return;
		if(ev->button == Button1 && (isfloating() || c->isfloating)) {
			restack();
			movemouse(c);
		}
		else if(ev->button == Button2)
			zoom(NULL);
		else if(ev->button == Button3
		&& (isfloating() || c->isfloating) && !c->isfixed)
		{
			restack();
			resizemouse(c);
		}
	}
}

static void
configurerequest(XEvent *e) {
	Client *c;
	XConfigureRequestEvent *ev = &e->xconfigurerequest;
	XWindowChanges wc;

	if((c = getclient(ev->window))) {
		c->ismax = False;
		if(ev->value_mask & CWBorderWidth)
			c->border = ev->border_width;
		if(c->isfixed || c->isfloating || isfloating()) {
			if(ev->value_mask & CWX)
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