/*!
 * \file gps_l1_ca_pcps_acquisition_test.cc
 * \brief  This class implements an acquisition test based on some input parameters.
 * \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 <gtest/gtest.h>
#include <sys/time.h>
#include <iostream>
#include <gnuradio/gr_top_block.h>
#include <gnuradio/gr_file_source.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 "gnss_synchro.h"

#include "gps_l1_ca_pcps_acquisition.h"

class GpsL1CaPcpsAcquisitionTest: public ::testing::Test {
protected:
	GpsL1CaPcpsAcquisitionTest() {
		queue = gr_make_msg_queue(0);
		top_block = gr_make_top_block("Acquisition test");
		factory = new GNSSBlockFactory();
		config = new InMemoryConfiguration();
		item_size = sizeof(gr_complex);
		stop = false;
		message = 0;
	}

	~GpsL1CaPcpsAcquisitionTest() {
		delete factory;
		delete config;
	}

	void init();
	void start_queue();
	void wait_message();
	void stop_queue();

	gr_msg_queue_sptr queue;
	gr_top_block_sptr top_block;
	GNSSBlockFactory* factory;
	InMemoryConfiguration* config;
	Gnss_Synchro gnss_synchro;
	size_t item_size;
    concurrent_queue<int> channel_internal_queue;
    bool stop;
    int message;
    boost::thread ch_thread;
};

void GpsL1CaPcpsAcquisitionTest::init(){

	gnss_synchro.Channel_ID=1;
	gnss_synchro.System = 'G';
	std::string signal = "1C";
	signal.copy(gnss_synchro.Signal,2,0);
	gnss_synchro.PRN=1;

	config->set_property("GNSS-SDR.internal_fs_hz", "4000000");
	config->set_property("Acquisition.item_type", "gr_complex");
	config->set_property("Acquisition.if", "0");
	config->set_property("Acquisition.sampled_ms", "1");
	config->set_property("Acquisition.dump", "false");
	config->set_property("Acquisition.implementation", "GPS_L1_CA_PCPS_Acquisition");
	config->set_property("Acquisition.threshold", "70");
	config->set_property("Acquisition.doppler_max", "7200");
	config->set_property("Acquisition.doppler_step", "600");
	config->set_property("Acquisition.repeat_satellite", "false");

}

void GpsL1CaPcpsAcquisitionTest::start_queue()
{
    ch_thread = boost::thread(&GpsL1CaPcpsAcquisitionTest::wait_message, this);
}


void GpsL1CaPcpsAcquisitionTest::wait_message()
{
    while (!stop)
        {
            channel_internal_queue.wait_and_pop(message);
            stop_queue();
        }
}

void GpsL1CaPcpsAcquisitionTest::stop_queue()
{
	stop = true;
 }



TEST_F(GpsL1CaPcpsAcquisitionTest, Instantiate)
{

	init();

	GpsL1CaPcpsAcquisition *acquisition = new GpsL1CaPcpsAcquisition(config, "Acquisition", 1, 1, queue);

	delete acquisition;

}

TEST_F(GpsL1CaPcpsAcquisitionTest, ConnectAndRun)
{
	int fs_in = 4000000;
	int nsamples = 4000;
	struct timeval tv;
    long long int begin;
    long long int end;

    init();
	GpsL1CaPcpsAcquisition *acquisition = new GpsL1CaPcpsAcquisition(config, "Acquisition", 1, 1, queue);

	ASSERT_NO_THROW( {
			acquisition->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);

			top_block->connect(source, 0, valve, 0);
			top_block->connect(valve, 0, acquisition->get_left_block(), 0);
		}) << "Failure connecting the blocks of acquisition test."<< 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;

	delete acquisition;
	std::cout <<  "Processed " << nsamples << " samples in " << (end-begin) << " microseconds" << std::endl;

}

TEST_F(GpsL1CaPcpsAcquisitionTest, ValidationOfResults)
{
	struct timeval tv;
    long long int begin;
    long long int end;
    double expected_delay_samples = 524;
    double expected_doppler_hz = -1680;
    init();
	GpsL1CaPcpsAcquisition *acquisition = new GpsL1CaPcpsAcquisition(config, "Acquisition", 1, 1, queue);

	ASSERT_NO_THROW( {
	    	acquisition->set_channel(1);
	}) << "Failure setting channel."<< std::endl;

	ASSERT_NO_THROW( {
	acquisition->set_gnss_synchro(&gnss_synchro);
	}) << "Failure setting gnss_synchro."<< std::endl;

	ASSERT_NO_THROW( {
    acquisition->set_channel_queue(&channel_internal_queue);
	}) << "Failure setting channel_internal_queue."<< std::endl;

	ASSERT_NO_THROW( {
	acquisition->set_threshold(config->property("Acquisition.threshold", 0.0));
	}) << "Failure setting threshold."<< std::endl;

	ASSERT_NO_THROW( {
	acquisition->set_doppler_max(config->property("Acquisition.doppler_max",
            10000));
	}) << "Failure setting doppler_max."<< std::endl;

	ASSERT_NO_THROW( {
	acquisition->set_doppler_step(config->property("Acquisition.doppler_step",
            500));
	}) << "Failure setting doppler_step."<< std::endl;

	ASSERT_NO_THROW( {
			acquisition->connect(top_block);
	}) << "Failure connecting acquisition to the top_block."<< std::endl;

	ASSERT_NO_THROW( {
			std::string file = "../src/tests/signal_samples/GPS_L1_CA_ID_1_Fs_4Msps_2ms.dat";
			const char * file_name = file.c_str();
			gr_file_source_sptr file_source = gr_make_file_source(sizeof(gr_complex),file_name,false);
			top_block->connect(file_source, 0, acquisition->get_left_block(), 0);
	}) << "Failure connecting the blocks of acquisition test."<< std::endl;

	start_queue();
	acquisition->init();
	acquisition->reset();

	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;

	ch_thread.join();

	unsigned long int nsamples = gnss_synchro.Acq_samplestamp_samples;
	std::cout <<  "Acquired " << nsamples << " samples in " << (end-begin) << " microseconds" << std::endl;

	ASSERT_EQ(1, message) << "Acquisition failure. Expected message: 1=ACQ SUCCESS.";

	double delay_error_samples = abs(expected_delay_samples-gnss_synchro.Acq_delay_samples);
	float delay_error_chips = (float)(delay_error_samples*1023/4000);
	double doppler_error_hz = abs(expected_doppler_hz-gnss_synchro.Acq_doppler_hz);

	EXPECT_LE(doppler_error_hz, 333) << "Doppler error exceeds the expected value: 333 Hz = 2/(3*integration period)";
	EXPECT_LT(delay_error_chips, 0.5) << "Delay error exceeds the expected value: 0.5 chips";

	delete acquisition;

}