/*!
 * \file control_thread.cc
 * \brief This class implements the receiver control plane
 * \author Carlos Aviles, 2010. carlos.avilesr(at)googlemail.com
 *
 * GNSS Receiver Control Plane: connects the flowgraph, starts running it,
 * and while it does not stop, reads the control messages generated by the blocks,
 * process them, and apply the corresponding actions.
 *
 * -------------------------------------------------------------------------
 *
 * 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 "control_thread.h"
#include <boost/lexical_cast.hpp>
#include "gps_ephemeris.h"
#include "gps_iono.h"
#include "gps_utc_model.h"
#include "gps_almanac.h"
#include "concurrent_queue.h"
#include "concurrent_map.h"
#include <unistd.h>
#include <gnuradio/message.h>
#include <gflags/gflags.h>
#include <glog/log_severity.h>
#include <glog/logging.h>
#include "gnss_flowgraph.h"
#include "file_configuration.h"
#include "control_message_factory.h"
#include <boost/thread/thread.hpp>
#include <iostream>

extern concurrent_map<Gps_Ephemeris> global_gps_ephemeris_map;
extern concurrent_map<Gps_Iono> global_gps_iono_map;
extern concurrent_map<Gps_Utc_Model> global_gps_utc_model_map;
extern concurrent_map<Gps_Almanac> global_gps_almanac_map;
extern concurrent_map<Gps_Acq_Assist> global_gps_acq_assist_map;

extern concurrent_queue<Gps_Ephemeris> global_gps_ephemeris_queue;
extern concurrent_queue<Gps_Iono> global_gps_iono_queue;
extern concurrent_queue<Gps_Utc_Model> global_gps_utc_model_queue;
extern concurrent_queue<Gps_Almanac> global_gps_almanac_queue;
extern concurrent_queue<Gps_Acq_Assist> global_gps_acq_assist_queue;

using google::LogMessage;

DEFINE_string(config_file, "../conf/gnss-sdr.conf",
		"Path to the file containing the configuration parameters");

ControlThread::ControlThread()
{
    configuration_ = new FileConfiguration(FLAGS_config_file);
    delete_configuration_ = true;
    init();
}


ControlThread::ControlThread(ConfigurationInterface *configuration)
{
    configuration_ = configuration;
    delete_configuration_ = false;
    init();
}



ControlThread::~ControlThread()
{
    delete flowgraph_;
    if (delete_configuration_) delete configuration_;
    delete control_message_factory_;
}



/*
 * Runs the control thread that manages the receiver control plane
 *
 * This is the main loop that reads and process the control messages
 * 1- Connect the GNSS receiver flowgraph
 * 2- Start the GNSS receiver flowgraph
 *    while (flowgraph_->running() && !stop)_{
 * 3- Read control messages and process them }
 */
void ControlThread::run()
{
    // Connect the flowgraph
    flowgraph_->connect();
    if (flowgraph_->connected())
        {
            LOG_AT_LEVEL(INFO) << "Flowgraph connected";
        }
    else
        {
            LOG_AT_LEVEL(ERROR) << "Unable to connect flowgraph";
            return;
        }
    // Start the flowgraph
    flowgraph_->start();
    if (flowgraph_->running())
        {
            LOG_AT_LEVEL(INFO) << "Flowgraph started";
        }
    else
        {
            LOG_AT_LEVEL(ERROR) << "Unable to start flowgraph";
            return;
        }
    // start the keyboard_listener thread
    keyboard_thread_ = boost::thread(&ControlThread::keyboard_listener, this);

    //start the GNSS SV data collector thread
    gps_ephemeris_data_collector_thread_ =boost::thread(&ControlThread::gps_ephemeris_data_collector, this);
    gps_iono_data_collector_thread_ =boost::thread(&ControlThread::gps_iono_data_collector, this);
    gps_utc_model_data_collector_thread_ =boost::thread(&ControlThread::gps_utc_model_data_collector, this);
    gps_acq_assist_data_collector_thread_=boost::thread(&ControlThread::gps_acq_assist_data_collector,this);

    // Main loop to read and process the control messages
    while (flowgraph_->running() && !stop_)
        {
            //TODO re-enable the blocking read messages functions and fork the process
            read_control_messages();
            if (control_messages_ != 0) process_control_messages();
        }
    std::cout<<"Stopping GNSS-SDR, please wait!"<<std::endl;
    flowgraph_->stop();
    gps_ephemeris_data_collector_thread_.timed_join(boost::posix_time::seconds(1));
    gps_iono_data_collector_thread_.timed_join(boost::posix_time::seconds(1));
    gps_utc_model_data_collector_thread_.timed_join(boost::posix_time::seconds(1));
    gps_acq_assist_data_collector_thread_.timed_join(boost::posix_time::seconds(1));
    keyboard_thread_.timed_join(boost::posix_time::seconds(1));

    LOG_AT_LEVEL(INFO) << "Flowgraph stopped";
}



void ControlThread::set_control_queue(boost::shared_ptr<gr::msg_queue> control_queue)
{
    if (flowgraph_->running())
        {
            LOG_AT_LEVEL(WARNING) << "Unable to set control queue while flowgraph is running";
            return;
        }
    control_queue_ = control_queue;
}



bool ControlThread::read_assistance_from_XML()
{
	std::string eph_xml_filename="gps_ephemeris.xml";
	std::cout<< "SUPL: Try read GPS ephemeris from XML file "<<eph_xml_filename<<std::endl;
	if (supl_client_ephemeris_.load_ephemeris_xml(eph_xml_filename)==true)
	{
		std::map<int,Gps_Ephemeris>::iterator gps_eph_iter;
		for(gps_eph_iter = supl_client_ephemeris_.gps_ephemeris_map.begin();
				gps_eph_iter != supl_client_ephemeris_.gps_ephemeris_map.end();
				gps_eph_iter++)
		{
			std::cout<<"SUPL: Read XML Ephemeris for GPS SV "<<gps_eph_iter->first<<std::endl;
			global_gps_ephemeris_queue.push(gps_eph_iter->second);
		}
		return false;
	}else{
		std::cout<< "ERROR: SUPL client error reading XML"<<std::endl;
		std::cout<< "Disabling SUPL assistance.."<<std::endl;
		return false;
	}
}
void ControlThread::init()
{
	// Instantiates a control queue, a GNSS flowgraph, and a control message factory
	control_queue_ = gr::msg_queue::make(0);
	flowgraph_ = new GNSSFlowgraph(configuration_, control_queue_);
	control_message_factory_ = new ControlMessageFactory();
	stop_ = false;
	processed_control_messages_ = 0;
	applied_actions_ = 0;

	//#########GNSS Asistence #################################
	// GNSS Assistance configuration
	bool enable_gps_supl_assistance=configuration_->property("GNSS-SDR.SUPL_gps_enabled",false);
	if (enable_gps_supl_assistance==true)
		//SUPL SERVER TEST. Not operational yet!
	{
		std::cout<< "SUPL RRLP GPS assistance enabled!"<<std::endl;
		std::string default_acq_server="supl.nokia.com";
		std::string default_eph_server="supl.google.com";
		supl_client_ephemeris_.server_name=configuration_->property("GNSS-SDR.SUPL_gps_ephemeris_server",default_acq_server);
		supl_client_acquisition_.server_name=configuration_->property("GNSS-SDR.SUPL_gps_acquisition_server",default_eph_server);
		supl_client_ephemeris_.server_port=configuration_->property("GNSS-SDR.SUPL_gps_ephemeris_port",7275);
		supl_client_acquisition_.server_port=configuration_->property("GNSS-SDR.SUPL_gps_acquisition_port",7275);
		supl_mcc=configuration_->property("GNSS-SDR.SUPL_MCC",244);
		supl_mns=configuration_->property("GNSS-SDR.SUPL_MNS",5);

		std::string default_lac="0x59e2";
		std::string default_ci="0x31b0";
		try {
			supl_lac = boost::lexical_cast<int>(configuration_->property("GNSS-SDR.SUPL_LAC",default_lac));
		} catch(boost::bad_lexical_cast &) {
			supl_lac=0x59e2;
		}
		try {
			supl_ci = boost::lexical_cast<int>(configuration_->property("GNSS-SDR.SUPL_CI",default_ci));
		} catch(boost::bad_lexical_cast &) {
			supl_ci=0x31b0;
		}

		bool SUPL_read_gps_assistance_xml=configuration_->property("GNSS-SDR.SUPL_read_gps_assistance_xml",false);
		if (SUPL_read_gps_assistance_xml==true)
		{
			// read assistance from file
			read_assistance_from_XML();
		}else{

			// Request ephemeris from SUPL server
			int error;
			supl_client_ephemeris_.request=1;
			std::cout<< "SUPL: Try read GPS ephemeris from SUPL server.."<<std::endl;
			error=supl_client_ephemeris_.get_assistance(supl_mcc,supl_mns,supl_lac,supl_ci);
			if (error==0)
			{
				std::map<int,Gps_Ephemeris>::iterator gps_eph_iter;
				for(gps_eph_iter = supl_client_ephemeris_.gps_ephemeris_map.begin();
						gps_eph_iter != supl_client_ephemeris_.gps_ephemeris_map.end();
						gps_eph_iter++)
				{
					std::cout<<"SUPL: Received Ephemeris for GPS SV "<<gps_eph_iter->first<<std::endl;
					global_gps_ephemeris_queue.push(gps_eph_iter->second);
				}
				//Save ephemeris to XML file
				std::string eph_xml_filename="gps_ephemeris.xml";
				if (supl_client_ephemeris_.save_ephemeris_xml(eph_xml_filename)==true)
				{
					std::cout<<"SUPL: XML Ephemeris file created"<<std::endl;
				}
			}else{
				std::cout<< "ERROR: SUPL client for Ephemeris returned "<<error<<std::endl;
				std::cout<< "Please check internet connection and SUPL server configuration"<<error<<std::endl;
				std::cout<< "Trying to read ephemeris from XML file"<<std::endl;
				if (read_assistance_from_XML()==false)
				{
					std::cout<< "ERROR: Could not read Ephemeris file: Disabling SUPL assistance.."<<std::endl;
				}
			}

			// Request almanac , IONO and UTC Model
			supl_client_ephemeris_.request=0;
			std::cout<< "SUPL: Try read Almanac, Iono, Utc Model, Ref Time and Ref Location from SUPL server.."<<std::endl;
			error=supl_client_ephemeris_.get_assistance(supl_mcc,supl_mns,supl_lac,supl_ci);
			if (error==0)
			{
				std::map<int,Gps_Almanac>::iterator gps_alm_iter;
				for(gps_alm_iter = supl_client_ephemeris_.gps_almanac_map.begin();
						gps_alm_iter != supl_client_ephemeris_.gps_almanac_map.end();
						gps_alm_iter++)
				{
					std::cout<<"SUPL: Received Almanac for GPS SV "<<gps_alm_iter->first<<std::endl;
					global_gps_almanac_queue.push(gps_alm_iter->second);
				}
				if (supl_client_ephemeris_.gps_iono.valid==true)
				{
					std::cout<<"SUPL: Received GPS Iono"<<std::endl;
					global_gps_iono_queue.push(supl_client_ephemeris_.gps_iono);
				}
				if (supl_client_ephemeris_.gps_utc.valid==true)
				{
					std::cout<<"SUPL: Received GPS UTC Model"<<std::endl;
					global_gps_utc_model_queue.push(supl_client_ephemeris_.gps_utc);
				}
			}else{
				std::cout<< "ERROR: SUPL client for Almanac returned "<<error<<std::endl;
				std::cout<< "Please check internet connection and SUPL server configuration"<<error<<std::endl;
				std::cout<< "Disabling SUPL assistance.."<<std::endl;
			}

			// Request acquisition assistance
			supl_client_acquisition_.request=2;
			std::cout<< "SUPL: Try read Acquisition assistance from SUPL server.."<<std::endl;
			error=supl_client_acquisition_.get_assistance(supl_mcc,supl_mns,supl_lac,supl_ci);
			if (error==0)
			{
				std::map<int,Gps_Acq_Assist>::iterator gps_acq_iter;
				for(gps_acq_iter = supl_client_acquisition_.gps_acq_map.begin();
						gps_acq_iter != supl_client_acquisition_.gps_acq_map.end();
						gps_acq_iter++)
				{
					std::cout<<"SUPL: Received Acquisition assistance for GPS SV "<<gps_acq_iter->first<<std::endl;
					global_gps_acq_assist_queue.push(gps_acq_iter->second);
				}
			}else{
				std::cout<< "ERROR: SUPL client for Acquisition assistance returned "<<error<<std::endl;
				std::cout<< "Please check internet connection and SUPL server configuration"<<error<<std::endl;
				std::cout<< "Disabling SUPL assistance.."<<std::endl;
			}
		}
	}
}

void ControlThread::read_control_messages()
{
    DLOG(INFO) << "Reading control messages from queue";
    boost::shared_ptr<gr::message> queue_message = control_queue_->delete_head();
    if (queue_message != 0)
        {
            control_messages_ = control_message_factory_->GetControlMessages(
                    queue_message);
        }
    else
        {
            control_messages_ = 0;
        }
}


// Apply the corresponding control actions
// TODO:  May be it is better to move the apply_action state machine to the control_thread
void ControlThread::process_control_messages()
{
    for (unsigned int i = 0; i < control_messages_->size(); i++)
        {
            if (stop_) break;
            if (control_messages_->at(i)->who == 200)
                {
                    apply_action(control_messages_->at(i)->what);
                }
            else
                {
                    flowgraph_->apply_action(control_messages_->at(i)->who,
                            control_messages_->at(i)->what);
                }
            delete control_messages_->at(i);
            processed_control_messages_++;
        }
    control_messages_->clear();
    delete control_messages_;
    DLOG(INFO) << "Processed all control messages";
}



void ControlThread::apply_action(unsigned int what)
{
    switch (what)
    {
    case 0:
        DLOG(INFO) << "Received action STOP";
        stop_ = true;
        applied_actions_++;
        break;
    default:
        DLOG(INFO) << "Unrecognized action.";
        break;
    }
}

void ControlThread::gps_acq_assist_data_collector()
{

	// ############ 1.bis READ EPHEMERIS/UTC_MODE/IONO QUEUE ####################
	Gps_Acq_Assist gps_acq;
	Gps_Acq_Assist gps_acq_old;
	while(stop_==false)
	{
		global_gps_acq_assist_queue.wait_and_pop(gps_acq);

		// DEBUG MESSAGE
		std::cout << "Acquisition assistance record has arrived from SAT ID "
				<< gps_acq.i_satellite_PRN << " with Doppler " << gps_acq.d_Doppler0<<" [Hz] "<<std::endl;
		// insert new acq record to the global ephemeris map
		if (global_gps_acq_assist_map.read(gps_acq.i_satellite_PRN,gps_acq_old))
		{

			std::cout << "Acquisition assistance record updated"<<std::endl;
			global_gps_acq_assist_map.write(gps_acq.i_satellite_PRN,gps_acq);

		}else{
			// insert new acq record
			std::cout << "New acq assist record inserted"<<std::endl;
			global_gps_acq_assist_map.write(gps_acq.i_satellite_PRN,gps_acq);
		}
	}
}


void ControlThread::gps_ephemeris_data_collector()
{

	// ############ 1.bis READ EPHEMERIS/UTC_MODE/IONO QUEUE ####################
	Gps_Ephemeris gps_eph;
	Gps_Ephemeris gps_eph_old;
	while(stop_==false)
	{
		global_gps_ephemeris_queue.wait_and_pop(gps_eph);

			// DEBUG MESSAGE
			std::cout << "Ephemeris record has arrived from SAT ID "
					<< gps_eph.i_satellite_PRN << " (Block "
					<<  gps_eph.satelliteBlock[gps_eph.i_satellite_PRN]
					                           << ")" << std::endl;
			// insert new ephemeris record to the global ephemeris map
			if (global_gps_ephemeris_map.read(gps_eph.i_satellite_PRN,gps_eph_old))
			{
				// Check the EPHEMERIS timestamp. If it is newer, then update the ephemeris
				if (gps_eph.i_GPS_week > gps_eph_old.i_GPS_week)
				{
					std::cout << "Ephemeris record updated (GPS week="<<gps_eph.i_GPS_week<<std::endl;
					global_gps_ephemeris_map.write(gps_eph.i_satellite_PRN,gps_eph);
				}else{
					if (gps_eph.d_Toe>gps_eph_old.d_Toe)
					{
						std::cout << "Ephemeris record updated (Toe="<<gps_eph.d_Toe<<std::endl;
						global_gps_ephemeris_map.write(gps_eph.i_satellite_PRN,gps_eph);
					}else{
						std::cout<<"Not updating the existing ephemeris"<<std::endl;
					}
				}

			}else{
				// insert new ephemeris record
				std::cout << "New Ephemeris record inserted with Toe="<<gps_eph.d_Toe<<" and GPS Week="<<gps_eph.i_GPS_week<<std::endl;
				global_gps_ephemeris_map.write(gps_eph.i_satellite_PRN,gps_eph);
			}
	}
}

void ControlThread::gps_iono_data_collector()
{

	// ############ 1.bis READ EPHEMERIS/UTC_MODE/IONO QUEUE ####################
	Gps_Iono gps_iono;
	Gps_Iono gps_iono_old;
	while(stop_==false)
	{
		global_gps_iono_queue.wait_and_pop(gps_iono);


		std::cout << "New IONO record has arrived "<< std::endl;
			// insert new ephemeris record to the global ephemeris map
			if (global_gps_iono_map.read(0,gps_iono_old))
			{
				// TODO: Check the IONO timestamp. If it is newer, then update the iono
				global_gps_iono_map.write(0,gps_iono);
			}else{
				// insert new ephemeris record
				global_gps_iono_map.write(0,gps_iono);
			}
	}
}

void ControlThread::gps_utc_model_data_collector()
{

	// ############ 1.bis READ EPHEMERIS/UTC_MODE/IONO QUEUE ####################
	Gps_Utc_Model gps_utc;
	Gps_Utc_Model gps_utc_old;
	while(stop_==false)
	{
		global_gps_utc_model_queue.wait_and_pop(gps_utc);
		std::cout << "New UTC MODEL record has arrived "<< std::endl;
			// insert new ephemeris record to the global ephemeris map
			if (global_gps_utc_model_map.read(0,gps_utc_old))
			{
				// TODO: Check the UTC MODEL timestamp. If it is newer, then update the UTC MODEL
				global_gps_utc_model_map.write(0,gps_utc);
			}else{
				// insert new ephemeris record
				global_gps_utc_model_map.write(0,gps_utc);
			}
	}
}


void ControlThread::keyboard_listener()
{
    bool read_keys = true;
    char c;
    while(read_keys)
        {
            c = std::cin.get();
            if (c =='q')
                {
                    std::cout << "Quit keystroke order received, stopping GNSS-SDR !!" << std::endl;
                    ControlMessageFactory* cmf = new ControlMessageFactory();
                    if (control_queue_ != gr::msg_queue::sptr())
                        {
                            control_queue_->handle(cmf->GetQueueMessage(200, 0));
                        }
                    delete cmf;
                    read_keys = false;
                }
        }
}