/* TinyWM is written by Nick Welch <nick@incise.org> in 2005 & 2011.
 * This software is in the public domain and is provided AS IS with NO WARRANTY
 *
 * tfurrows: added actions for mod1+left click and mod1+middle click
 *           added exit(0) on mod1+right click at screen position 0,0
 *           added mod1+F2 to lower focus window
 *           added mod1+F3 to shrink window or restore
 *           added mod1+F4 to close/destroy window
 */

#include <X11/Xlib.h>
#include <stdlib.h>

#define MAX(a, b) ((a) > (b) ? (a) : (b))
#define LCRUN "/usr/bin/xterm -fg white -bg black &"
#define MCRUN "/usr/bin/perl /home/jlyman/bin/deskpad &"

int main(void) {

	Display * dpy;
	XWindowAttributes attr;
	XButtonEvent start;
	XEvent ev;

	if(!(dpy = XOpenDisplay(0x0))) return 1;

	XGrabKey(dpy, XKeysymToKeycode(dpy, XStringToKeysym("F1")), Mod1Mask,
		DefaultRootWindow(dpy), True, GrabModeAsync, GrabModeAsync);
	XGrabKey(dpy, XKeysymToKeycode(dpy, XStringToKeysym("F2")), Mod1Mask,
		DefaultRootWindow(dpy), True, GrabModeAsync, GrabModeAsync);
	XGrabKey(dpy, XKeysymToKeycode(dpy, XStringToKeysym("F3")), Mod1Mask,
		DefaultRootWindow(dpy), True, GrabModeAsync, GrabModeAsync);
	XGrabKey(dpy, XKeysymToKeycode(dpy, XStringToKeysym("F4")), Mod1Mask,
		DefaultRootWindow(dpy), True, GrabModeAsync, GrabModeAsync);

	XGrabButton(dpy, 1, Mod1Mask, DefaultRootWindow(dpy), True,
		ButtonPressMask|ButtonReleaseMask|PointerMotionMask, GrabModeAsync, GrabModeAsync, None, None);
	XGrabButton(dpy, 2, Mod1Mask, DefaultRootWindow(dpy), True,
		ButtonPressMask|ButtonReleaseMask|PointerMotionMask, GrabModeAsync, GrabModeAsync, None, None);
	XGrabButton(dpy, 3, Mod1Mask, DefaultRootWindow(dpy), True,
		ButtonPressMask|ButtonReleaseMask|PointerMotionMask, GrabModeAsync, GrabModeAsync, None, None);

	start.subwindow = None;
	for(;;) {
		XNextEvent(dpy, &ev);
		if(ev.type == KeyPress && ev.xkey.subwindow != None) {
			switch(ev.xkey.keycode) {
				case 0x43:
					XRaiseWindow(dpy, ev.xkey.subwindow);
					XSetInputFocus(dpy, ev.xkey.subwindow, RevertToPointerRoot, CurrentTime);
					XSync(dpy,True);
					break;
				case 0x44:
					XLowerWindow(dpy, ev.xkey.subwindow);
					break;
				case 0x45:
					XGetWindowAttributes(dpy, ev.xbutton.subwindow, &attr);
					if(attr.width == 150) {
						XResizeWindow(dpy, ev.xkey.subwindow, 500, 300);
						XRaiseWindow(dpy, ev.xkey.subwindow);
					} else {
						XResizeWindow(dpy, ev.xkey.subwindow, 150, 20);
						XLowerWindow(dpy, ev.xkey.subwindow);
					}
					break;
				case 0x46:
					XDestroyWindow(dpy, ev.xkey.subwindow);
					break;
			}
		} else if(ev.type == ButtonPress && ev.xbutton.subwindow != None) {
			XGetWindowAttributes(dpy, ev.xbutton.subwindow, &attr);
			start = ev.xbutton;
			XRaiseWindow(dpy, start.subwindow);
			XSetInputFocus(dpy, start.subwindow, RevertToPointerRoot, CurrentTime);
			XSync(dpy,True);
		} else if(ev.type == MotionNotify && start.subwindow != None) {
			int xdiff = ev.xbutton.x_root - start.x_root;
			int ydiff = ev.xbutton.y_root - start.y_root;
			XMoveResizeWindow(dpy, start.subwindow,
			attr.x + (start.button==1 ? xdiff : 0),
			attr.y + (start.button==1 ? ydiff : 0),
			MAX(1, attr.width + (start.button==3 ? xdiff : 0)),
			MAX(1, attr.height + (start.button==3 ? ydiff : 0)));
		} else if(ev.type == ButtonPress && ev.xbutton.subwindow == 0) {
			switch(ev.xbutton.button) {
				case Button1:
					system(LCRUN);
					break;
				case Button2:
					system(MCRUN);
					break;
				case Button3:
					if(ev.xbutton.x == 0 && ev.xbutton.y == 0)
						exit(0);
					break;
			}
		} else if(ev.type == ButtonRelease) {
			start.subwindow = None;
		}
	}
}