/*!
 * \file fir_filter_test.cc
 * \brief Implements Unit Test for the FirFilter class.
 * \author Luis Esteve, 2012. luis(at)epsilon-formacion.com
 *
 * -------------------------------------------------------------------------
 *
 * Copyright (C) 2010-2012  (see AUTHORS file for a list of contributors)
 *
 * GNSS-SDR is a software defined Global Navigation
 *          Satellite Systems receiver
 *
 * This file is part of GNSS-SDR.
 *
 * GNSS-SDR 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 of the License, or
 * at your option) any later version.
 *
 * GNSS-SDR 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 GNSS-SDR. If not, see <http://www.gnu.org/licenses/>.
 *
 * -------------------------------------------------------------------------
 */

#include <gflags/gflags.h>
#include <gtest/gtest.h>
#include <sys/time.h>
#include <iostream>
#include <gnuradio/gr_top_block.h>
#include <gnuradio/gr_sig_source_c.h>
#include <gnuradio/gr_msg_queue.h>
#include <gnuradio/gr_null_sink.h>

#include "gnss_block_factory.h"
#include "gnss_block_interface.h"
#include "in_memory_configuration.h"
#include "gnss_sdr_valve.h"
#include "fir_filter.h"

DEFINE_string(filter_test_output_filename, "../src/tests/data/fir_filter_test_output.dat", "Dump filename");

class Fir_Filter_Test: public ::testing::Test {
protected:
	Fir_Filter_Test() {
		queue = gr_make_msg_queue(0);
		top_block = gr_make_top_block("Fir filter test");
		config = new InMemoryConfiguration();
		item_size = sizeof(gr_complex);

	}
	~Fir_Filter_Test() {
		delete config;
	}
	void init();
	gr_msg_queue_sptr queue;
	gr_top_block_sptr top_block;
	InMemoryConfiguration* config;
	size_t item_size;

};

void Fir_Filter_Test::init(){

	config->set_property("InputFilter.number_of_taps", "4");
	config->set_property("InputFilter.number_of_bands", "2");

	config->set_property("InputFilter.band1_begin", "0.0");
	config->set_property("InputFilter.band1_end", "0.45");
	config->set_property("InputFilter.band2_begin", "0.55");
	config->set_property("InputFilter.band2_end", "1.0");

	config->set_property("InputFilter.ampl1_begin", "1.0");
	config->set_property("InputFilter.ampl1_end", "1.0");
	config->set_property("InputFilter.ampl2_begin", "0.0");
	config->set_property("InputFilter.ampl2_end", "0.0");

	config->set_property("InputFilter.band1_error", "1.0");
	config->set_property("InputFilter.band2_error", "1.0");

	config->set_property("InputFilter.filter_type", "bandpass");
	config->set_property("InputFilter.grid_density", "16");

//		config->set_property("InputFilter.dump", "true");

}

TEST_F(Fir_Filter_Test, Instantiate)
{
	init();

	FirFilter *filter = new FirFilter(config, "InputFilter", 1, 1, queue);

	delete filter;
}

TEST_F(Fir_Filter_Test, ConnectAndRun)
{
	int fs_in = 8000000;
	int nsamples = 10000000;
	struct timeval tv;
    long long int begin = 0;
    long long int end = 0;

    init();

	FirFilter *filter = new FirFilter(config, "InputFilter", 1, 1, queue);

	ASSERT_NO_THROW( {
			filter->connect(top_block);
			gr_sig_source_c_sptr source = gr_make_sig_source_c(fs_in,GR_SIN_WAVE, 1000, 1, gr_complex(0));
			gr_block_sptr valve = gnss_sdr_make_valve(sizeof(gr_complex), nsamples, queue);
			gr_block_sptr null_sink = gr_make_null_sink(item_size);

			top_block->connect(source, 0, valve, 0);
			top_block->connect(valve, 0, filter->get_left_block(), 0);
			top_block->connect(filter->get_right_block(), 0, null_sink, 0);
		}) << "Failure connecting the top_block."<< std::endl;

	EXPECT_NO_THROW( {
			gettimeofday(&tv, NULL);
			begin = tv.tv_sec *1000000 + tv.tv_usec;
			top_block->run(); // Start threads and wait
			gettimeofday(&tv, NULL);
			end = tv.tv_sec *1000000 + tv.tv_usec;
		}) << "Failure running he top_block."<< std::endl;
	std::cout <<  "Filtered " << nsamples << " samples in " << (end-begin) << " microseconds" << std::endl;

	delete filter;
}