#!/usr/bin/env python
#
# Copyright 2012,2013 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.
#

import math

from gnuradio import gr, gr_unittest, analog, blocks

def avg_mag_sqrd_c(x, alpha):
    y = [0,]
    for xi in x:
        tmp = alpha*(xi.real*xi.real + xi.imag*xi.imag) + (1-alpha)*y[-1]
        y.append(tmp)
    return y

def avg_mag_sqrd_f(x, alpha):
    y = [0,]
    for xi in x:
        tmp = alpha*(xi*xi) + (1-alpha)*y[-1]
        y.append(tmp)
    return y

class test_probe_avg_mag_sqrd(gr_unittest.TestCase):

    def setUp(self):
        self.tb = gr.top_block()

    def tearDown(self):
        self.tb = None

    def test_c_001(self):
        alpha = 0.0001
        src_data = [1.0+1.0j, 2.0+2.0j, 3.0+3.0j, 4.0+4.0j, 5.0+5.0j,
                    6.0+6.0j, 7.0+7.0j, 8.0+8.0j, 9.0+9.0j, 10.0+10.0j]
        expected_result = avg_mag_sqrd_c(src_data, alpha)[-1]

        src = blocks.vector_source_c(src_data)
        op = analog.probe_avg_mag_sqrd_c(0, alpha)

        self.tb.connect(src, op)
        self.tb.run()

        result_data = op.level()
        self.assertAlmostEqual(expected_result, result_data, 5)

    def test_cf_002(self):
        alpha = 0.0001
        src_data = [1.0+1.0j, 2.0+2.0j, 3.0+3.0j, 4.0+4.0j, 5.0+5.0j,
                    6.0+6.0j, 7.0+7.0j, 8.0+8.0j, 9.0+9.0j, 10.0+10.0j]
        expected_result = avg_mag_sqrd_c(src_data, alpha)[0:-1]

        src = blocks.vector_source_c(src_data)
        op = analog.probe_avg_mag_sqrd_cf(0, alpha)
        dst = blocks.vector_sink_f()

        self.tb.connect(src, op)
        self.tb.connect(op, dst)
        self.tb.run()

        result_data = dst.data()
        self.assertComplexTuplesAlmostEqual(expected_result, result_data, 5)

    def test_f_003(self):
        alpha = 0.0001
        src_data = [1.0, 2.0, 3.0, 4.0, 5.0,
                    6.0, 7.0, 8.0, 9.0, 10.0]
        expected_result = avg_mag_sqrd_f(src_data, alpha)[-1]

        src = blocks.vector_source_f(src_data)
        op = analog.probe_avg_mag_sqrd_f(0, alpha)

        self.tb.connect(src, op)
        self.tb.run()

        result_data = op.level()
        self.assertAlmostEqual(expected_result, result_data, 5)

if __name__ == '__main__':
    gr_unittest.run(test_probe_avg_mag_sqrd, "test_probe_avg_mag_sqrd.xml")

