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#include <u.h>
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#include <libc.h>
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#include <draw.h>
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#include <event.h>
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/*
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 * Convert AccuPoint buttons 4 and 5 to a simulation of button 2.
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 * The buttons generate down events, repeat, and have no up events,
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 * so it's a struggle. This program turns the left button into a near-as-
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 * possible simulation of a regular button 2, but it can only sense up
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 * events by timeout, so it's sluggish.  Thus it also turns the right button
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 * into a click on button 2, useful for acme and chords.
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 */
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typedef struct M M;
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struct M
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{
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	Mouse;
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	int	byte;
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};
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int	button2;
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int	interrupted;
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int
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readmouse(M *m)
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{
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	char buf[1+4*12];
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	int n;
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	n = read(0, buf, sizeof buf);
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	if(n < 0)
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		return n;
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	if(n != sizeof buf)
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		return 0;
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	m->byte = buf[0];
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	m->xy.x =  atoi(buf+1+0*12);
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	m->xy.y =  atoi(buf+1+1*12);
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	m->buttons =  atoi(buf+1+2*12);
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	m->msec =  atoi(buf+1+3*12);
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	return 1;
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}
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void
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writemouse(M *m)
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{
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	print("%c%11d %11d %11d %11ld ",
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		m->byte,
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		m->xy.x,
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		m->xy.y,
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		m->buttons&7,
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		m->msec);
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}
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void
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notifyf(void*, char *s)
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{
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	if(strcmp(s, "alarm") == 0)
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		interrupted = 1;
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	noted(NCONT);
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}
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void
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main(void)
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{
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	M m, om;
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	int n;
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	notify(notifyf);
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	memset(&m, 0, sizeof m);
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	om = m;
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	for(;;){
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		interrupted = 0;
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		/* first click waits 500ms before repeating; after that they're 150, but that's ok */
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		if(button2)
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			alarm(550);
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		n = readmouse(&m);
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		if(button2)
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			alarm(0);
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		if(interrupted){
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			/* timed out; clear button 2 */
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			om.buttons &= ~2;
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			button2 = 0;
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			writemouse(&om);
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			continue;
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		}
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		if(n <= 0)
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			break;
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		/* avoid bounce caused by button 5 click */
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		if((om.buttons&16) && (m.buttons&16)){
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			om.buttons &= ~16;
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			continue;
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		}
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		if(m.buttons & 2)
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			button2 = 0;
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		else{
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			/* only check 4 and 5 if 2 isn't down of its own accord */
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			if(m.buttons & 16){
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				/* generate quick button 2 click */
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				button2 = 0;
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				m.buttons |= 2;
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				writemouse(&m);
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				m.buttons &= ~2;
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				/* fall through to generate up event */
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			}else if(m.buttons & 8){
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				/* press and hold button 2 */
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				button2 = 1;
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			}
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		}
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		if(button2)
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			m.buttons |= 2;
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		if(m.byte!=om.byte || m.buttons!=om.buttons || !eqpt(m.xy, om.xy))
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			writemouse(&m);
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		om = m;
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	}
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}