// Wilders Smoothing
//
// wilders_smoothing
//
// Wilder's Smoothing
//
// 
//
// Inputs:    1
// Outputs:   1
// Constants: 1


#include "ts.h"

typedef struct {
    fp_t k;
} ts_wilders_smoothing_params_t;

ts_parameter_t const ts_wilders_smoothing_p = { .n_inputs = 1, .n_outputs = 1, .n_constants = 1, .params_size = sizeof(ts_wilders_smoothing_params_t) };

uint_t ts_wilders_smoothing_offset( ts_constant_t const *c )
{
	( void )c;
	return ( 0 );
}

int ts_wilders_smoothing(
	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_wilders_smoothing_p );
	if ( !c ) return -1;

    fp_t k = ((ts_wilders_smoothing_params_t const *)c)->k;
	if (k == 0) return -1;
    fp_t a = 1.0 / k;

    y[0][0] = x[0][0];

    for( uint_t i = 1; i < n; ++i )
    {
        y[0][i] = y[0][i - 1] + a * ( x[0][i] - y[0][i - 1] );
    }

	return 0;
}