/* -*- c++ -*- */
/*
 * Copyright 2002,2012 Free Software Foundation, Inc.
 *
 * This file is part of GNU Radio
 *
 * GNU Radio is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 3, or (at your option)
 * any later version.
 *
 * GNU Radio is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with GNU Radio; see the file COPYING.  If not, write to
 * the Free Software Foundation, Inc., 51 Franklin Street,
 * Boston, MA 02110-1301, USA.
 */

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <gruel/attributes.h>
#include <cppunit/TestAssert.h>
#include <qa_rotator.h>
#include <analog/rotator.h>
#include <stdio.h>
#include <cmath>
#include <gr_expj.h>

namespace gr {
  namespace analog {

    // error vector magnitude
    __GR_ATTR_UNUSED static float
    error_vector_mag(gr_complex a, gr_complex b)
    {
      return abs(a-b);
    }

    void
    qa_rotator::t1()
    {
      static const unsigned int N = 100000;

      rotator r;

      double phase_incr = 2*M_PI / 1003;
      double phase = 0;

      // Old code: We increment then return the rotated value, thus we
      // need to start one tick back
      // r.set_phase(gr_complex(1,0) * conj(gr_expj(phase_incr)));

      r.set_phase(gr_complex(1,0));
      r.set_phase_incr(gr_expj(phase_incr));

      for(unsigned i = 0; i < N; i++) {
	gr_complex expected = gr_expj(phase);
	gr_complex actual = r.rotate(gr_complex(1, 0));

#if 0
	float evm = error_vector_mag(expected, actual);
	printf("[%6d] expected: (%8.6f, %8.6f)  actual: (%8.6f, %8.6f)  evm: %8.6f\n",
	       i, expected.real(), expected.imag(), actual.real(), actual.imag(), evm);
#endif

	CPPUNIT_ASSERT_COMPLEXES_EQUAL(expected, actual, 0.0001);

	phase += phase_incr;
	if(phase >= 2*M_PI)
	  phase -= 2*M_PI;
      }
    }

  } /* namespace analog */
} /* namespace gr */