// Reversal
//
// reversal
//
// Reversal indicator
//
// 
//
// Inputs:    1
// Outputs:   1
// Constants: 0


#include "ts.h"


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

uint_t ts_reversal_offset( ts_constant_t const *c )
{
	( void )c;
	return ( 2 );
}

int ts_reversal(
	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_reversal_p );
	(void)c;
	if (n > 0) y[0][0] = 0;
	if (n > 1) y[0][1] = 0;
	for( uint_t i = 2; i < n; ++i )
	{
		if( x[0][i] < x[0][i - 1] && x[0][i - 1] > x[0][i - 2] )
		{
			y[0][i] = -1;
		}
		else if( x[0][i] > x[0][i - 1] && x[0][i - 1] < x[0][i - 2] )
		{
			y[0][i] = 1;
		}
		else
		{
			y[0][i] = 0;
		}
	}
	return 0;
}