// Qstick
//
// qstick
//
// Q Stick
//
// 
//
// Inputs:    4
// Outputs:   1
// Constants: 1


#include "ts.h"

typedef struct {
    uint_t k;
} ts_qstick_params_t;

ts_parameter_t const ts_qstick_p = { .n_inputs = 4, .n_outputs = 1, .n_constants = 1, .params_size = sizeof(ts_qstick_params_t) };

uint_t ts_qstick_offset( ts_constant_t const *c )
{
	( void )c;
	return ( c ? ((ts_qstick_params_t *)c)->k - 1 : 0 );
}

int ts_qstick(
	fp_t * const *y, uint_t y_n,
	fp_t const * const *x, uint_t x_n,
	uint_t n, ts_constant_t const *c
)
{
	TS_PROLOGUE( ts_qstick_p );
	if ( !c ) return -1;
    uint_t k = ((ts_qstick_params_t *)c)->k;
    if (k == 0 || n < k) return -1;

    for( uint_t i = k - 1; i < n; ++i )
    {
        fp_t sum = 0;
        for( uint_t j = 0; j < k; ++j )
        {
            sum += ts_c( x, i - k + 1 + j ) - ts_o( x, i - k + 1 + j );
        }
        y[0][i] = sum / (fp_t)k;
    }
	return 0;
}