// Crossover
//
// crossover - crossover
//
//       ⎧ -1 if x0_i < x1_i and x0_i-1 > x1_i-1
// y_i = ⎨ 0 if x = 0
//       ⎩ 1 if x0_i > x1_i and x0_i-1 < x1_i-1
//
// Inputs:    2
// Outputs:   1
// Constants: 0


#include <math.h>
#include "ts.h"



ts_parameter_t const ts_crossover_p = { .n_inputs = 2, .n_outputs = 1, .n_constants = 0, .params_size = 0 };


uint_t ts_crossover_offset( ts_constant_t const *c )
{
	( void )c;
	return ( 1 );
}

int ts_crossover(
	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_crossover_p );
	(void)c;
	if ( n < 2 ) return -1;

	uint_t xi;
	uint_t yi;

  xi = 1;
	yi = 1;

	y[0][0] = 0;
	for( ; xi < n; xi++, yi++ )
	{
		if( x[0][xi] > x[1][xi] && x[0][xi - 1] <= x[1][xi - 1] )
			y[0][yi] = 1;

		else if( x[0][xi] < x[1][xi] && x[0][xi - 1] >= x[1][xi - 1] )
			y[0][yi] = -1;

		else
			y[0][yi] = 0;
	}
	return 0;
}