#include <u.h>
#include <libc.h>
#include <thread.h>
#include "guic.h"

enum {
	Argsmax = 8,
	Maxstack = 16384,
};

Channel *guichan;
static int gfd;
static char buf[128];

static int
lookup(char **keywords, char *s)
{
	int k;
	for(k=0; keywords[k]; k++)
		if(strcmp(keywords[k], s) == 0)
			return k;
	return -1;
}

static void
guiproc(void *)
{
	char input[128];
	char *argv[Argsmax];
	int argc;
	int nr, k;
	Event ev;

	for(;;){
		nr = read(gfd, input, sizeof(input));
		if(nr <= 0)
			break;
		input[nr-1] = 0;
		argc = tokenize(input, argv, Argsmax);
		if(argv == 0)
			continue;
		k = lookup(keywords, argv[0]);
		if(k < 0)
			continue;
		ev.k = k;
		ev.n = argc > 1 ? atoi(argv[1]) : 0;
		send(guichan, &ev);
	 }
	 threadexitsall(0);
}

void
guiwrite(char *fmt, ...)
{
	va_list ap;

	va_start(ap, fmt);
	vfprint(gfd, fmt, ap);
	va_end(ap);
}

void
guiload(char *path)
{
	int fd, nr;

	fd = open(path, OREAD);
	if(fd < 0)
		sysfatal("gui: %r");
	for(;;){
		nr = read(fd, buf, sizeof(buf));
		if(nr <= 0)
			break;
		write(gfd, buf, nr);
	}
	close(fd);
}

void
guistart(char *path)
{
	guichan = chancreate(sizeof(Event), 16);
	if(path == 0)
		return;
	gfd = open(path, OREAD);
	if(gfd < 0)
		sysfatal("gui: %r");
	proccreate(guiproc, 0, Maxstack);
}