#!/usr/bin/env python
#
# Copyright 2007,2010,2012 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.
#

from gnuradio import gr, gr_unittest, analog, blocks
import numpy


class test_fastnoise_source(gr_unittest.TestCase):

    def setUp (self):

        self.num = 2**22
        self.num_items = 10**6
        self.default_args = {"samples": self.num, "seed": int(43), "ampl": 1}

    def tearDown (self):
        pass

    def run_test_real(self, form):
        """ Run test case with float input/output
        """
        tb = gr.top_block()
        src = analog.fastnoise_source_f(type=form, **self.default_args)
        head = blocks.head(nitems=self.num_items, sizeof_stream_item=gr.sizeof_float)
        sink = blocks.vector_sink_f()
        tb.connect(src, head, sink)
        tb.run()
        return numpy.array(sink.data())

    def run_test_complex(self, form):
        """ Run test case with complex input/output
        """
        tb = gr.top_block()
        src = analog.fastnoise_source_c(type=form, **self.default_args)
        head = blocks.head(nitems=self.num_items, sizeof_stream_item=gr.sizeof_gr_complex)
        sink = blocks.vector_sink_c()
        tb.connect(src, head, sink)
        tb.run()
        return numpy.array(sink.data())

    def test_001_real_uniform_moments(self):

        data = self.run_test_real(analog.GR_UNIFORM)

        self.assertAlmostEqual(min(data), -1, places=4)
        self.assertAlmostEqual(max(data), 1, places=4)

        # mean, variance
        self.assertAlmostEqual(data.mean(), 0, places=2)
        self.assertAlmostEqual(data.var(), (1-(-1))**2./12, places=3)

    def test_001_real_gaussian_moments(self):
        data = self.run_test_real(analog.GR_GAUSSIAN)

        # mean, variance
        self.assertAlmostEqual(data.mean(), 0, places=2)
        self.assertAlmostEqual(data.var(), 1, places=2)

    def test_001_real_laplacian_moments(self):
        data = self.run_test_real(analog.GR_LAPLACIAN)

        # mean, variance
        self.assertAlmostEqual(data.mean(), 0, places=2)
        self.assertAlmostEqual(data.var(), 2, places=2)

    def test_001_complex_uniform_moments(self):
        data = self.run_test_complex(analog.GR_UNIFORM)

        # mean, variance
        self.assertAlmostEqual(data.real.mean(), 0, places=2)
        self.assertAlmostEqual(data.real.var(), 0.5*(1-(-1))**2./12, places=3)

        self.assertAlmostEqual(data.imag.mean(), 0, places=2)
        self.assertAlmostEqual(data.imag.var(), 0.5*(1-(-1))**2./12, places=3)

    def test_001_complex_gaussian_moments(self):
        data = self.run_test_complex(analog.GR_GAUSSIAN)

        # mean, variance
        self.assertAlmostEqual(data.real.mean(), 0, places=2)
        self.assertAlmostEqual(data.real.var(), 0.5, places=2)

        self.assertAlmostEqual(data.imag.mean(), 0, places=2)
        self.assertAlmostEqual(data.imag.var(), 0.5, places=2)

    def test_002_real_uniform_reproducibility(self):
        data1 = self.run_test_real(analog.GR_UNIFORM)
        data2 = self.run_test_real(analog.GR_UNIFORM)

        # It's pseudoramdo thus must be equal
        self.assertTrue(numpy.array_equal(data1, data2))

    def test_002_real_gaussian_reproducibility(self):
        data1 = self.run_test_real(analog.GR_GAUSSIAN)
        data2 = self.run_test_real(analog.GR_GAUSSIAN)

        self.assertTrue(numpy.array_equal(data1, data2))

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