#include "zexy.h"
#ifdef NT
#pragma warning( disable : 4244 )
#pragma warning( disable : 4305 )
#endif

/* ------------------------ sigzero~ ----------------------------- */
/*
	a very useful function, which detects, whether a signal is zeroes-only this block or not
	this is really great together with the "switch~"-object
*/



static t_class *sigzero_class;

typedef struct _sigzero
{
	t_object x_obj;
	int activate;
	int current; /* 0 == (signalblock == 0); 1==(signalblock != 0) */
} t_sigzero;

static void sigzero_activate(t_sigzero *x, t_floatarg activate)
{
	x->activate = (activate)?1:0;
}

static void sigzero_banged(t_sigzero *x, t_floatarg activate)
{
	x->activate = 1;
}

static void sigzero_off(t_sigzero *x, t_floatarg activate)
{
	x->activate = 0;
}

static t_int *sigzero_perform(t_int *w)
{
	t_float *in = (t_float *)w[1];
	t_sigzero *x = (t_sigzero *)w[2];
	int n = (int)w[3];

	int non_zero = 0;

	if (x->activate) {
		while (n--)
		{
			if (*in++ != 0.) {
				non_zero = 1;
				break;
			}
		}
		if (non_zero != x->current) {
		    outlet_float(x->x_obj.ob_outlet, x->current = non_zero);
		}
//		else post("non_zero=%d\tcurrent=%d", non_zero, x->current);
	}

	return (w+4);
}

static void sigzero_dsp(t_sigzero *x, t_signal **sp)
{
	dsp_add(sigzero_perform, 3, sp[0]->s_vec, x, sp[0]->s_n);
}

static void helper(void)
{
	post("\n%c sigzero~-object :: for detecting whether a signal is currently zero or not", HEARTSYMBOL);
	post("'bang'\t: turn the detector on\n"
		 "'off'\t: turn it off\n"
		 "<1/0>\t: turn it on/off\n"
		 "'help'\t: view this\n"
		 "signal~");
	post("outlet :: 1/0\t: signal turned to non-zero/zero\n");
}

static void *sigzero_new(t_symbol s)
{
	t_sigzero *x = (t_sigzero *)pd_new(sigzero_class);
    outlet_new(&x->x_obj, &s_float);
	return (x);
}

void z_sigzero_setup(void)
{
	sigzero_class = class_new(gensym("sigzero~"), (t_newmethod)sigzero_new, 0,
		sizeof(t_sigzero), 0, 0);
	class_addfloat(sigzero_class, sigzero_activate);
	class_addbang(sigzero_class, sigzero_banged);
	class_addmethod(sigzero_class, (t_method)sigzero_off, gensym("off"), 0);

	class_addmethod(sigzero_class, nullfn, gensym("signal"), 0);
	class_addmethod(sigzero_class, (t_method)sigzero_dsp, gensym("dsp"), 0);

	class_addmethod(sigzero_class, (t_method)helper, gensym("help"), 0);
	class_sethelpsymbol(sigzero_class, gensym("zexy/sigzero~"));
}