#include <m_pd.h>
#include <m_fixed.h>


static t_class *vsnapshot_tilde_class;

typedef struct _vsnapshot
{
    t_object x_obj;
    int x_n;
    int x_gotone;
    t_sample *x_vec;
    float x_f;
    float x_sampspermsec;
    double x_time;
} t_vsnapshot;

static void *vsnapshot_tilde_new(void)
{
    t_vsnapshot *x = (t_vsnapshot *)pd_new(vsnapshot_tilde_class);
    outlet_new(&x->x_obj, &s_float);
    x->x_f = 0;
    x->x_n = 0;
    x->x_vec = 0;
    x->x_gotone = 0;
    return (x);
}

static t_int *vsnapshot_tilde_perform(t_int *w)
{
    t_sample *in = (t_sample *)(w[1]);
    t_vsnapshot *x = (t_vsnapshot *)(w[2]);
    t_sample *out = x->x_vec;
    int n = x->x_n, i;
    for (i = 0; i < n; i++)
    	out[i] = in[i];
    x->x_time = clock_getlogicaltime();
    x->x_gotone = 1;
    return (w+3);
}

static void vsnapshot_tilde_dsp(t_vsnapshot *x, t_signal **sp)
{
    int n = sp[0]->s_n;
    if (n != x->x_n)
    {
    	if (x->x_vec)
	    t_freebytes(x->x_vec, x->x_n * sizeof(t_sample));
	x->x_vec = (t_sample *)getbytes(n * sizeof(t_sample));
    	x->x_gotone = 0;
	x->x_n = n;
    }
    x->x_sampspermsec = sp[0]->s_sr / 1000;
    dsp_add(vsnapshot_tilde_perform, 2, sp[0]->s_vec, x);
}

static void vsnapshot_tilde_bang(t_vsnapshot *x)
{
    float val;
    if (x->x_gotone)
    {
    	int indx = clock_gettimesince(x->x_time) * x->x_sampspermsec;
	if (indx < 0)
	    indx = 0;
    	else if (indx >= x->x_n)
	    indx = x->x_n - 1;
	val = x->x_vec[indx];
    }
    else val = 0;
    outlet_float(x->x_obj.ob_outlet, val);
}

static void vsnapshot_tilde_ff(t_vsnapshot *x)
{
    if (x->x_vec)
	t_freebytes(x->x_vec, x->x_n * sizeof(t_sample));
}

void vsnapshot_tilde_setup(void)
{
    vsnapshot_tilde_class = class_new(gensym("vsnapshot~"),
    	vsnapshot_tilde_new, (t_method)vsnapshot_tilde_ff,
    	sizeof(t_vsnapshot), 0, 0);
    CLASS_MAINSIGNALIN(vsnapshot_tilde_class, t_vsnapshot, x_f);
    class_addmethod(vsnapshot_tilde_class, (t_method)vsnapshot_tilde_dsp, gensym("dsp"), 0);
    class_addbang(vsnapshot_tilde_class, vsnapshot_tilde_bang);
}