/*

 * Master Firmware: NMEA Parser

 *

 * This file is part of OpenTrack.

 *

 * OpenTrack is free software: you can redistribute it and/or modify

 * it under the terms of the GNU Affero General Public License as published by

 * the Free Software Foundation, either version 3 of the License, or

 * (at your option) any later version.

 *

 * OpenTrack 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 Affero General Public License for more details.

 *

 * You should have received a copy of the GNU Affero General Public License

 * along with OpenTrack. If not, see <http://www.gnu.org/licenses/>.

 * 

 * Ethan Zonca

 * Matthew Kanning

 * Kyle Ripperger

 * Matthew Kroening

 *

 */

#include <stdbool.h>

#include <string.h>

#include <stdio.h>

#include <avr/io.h>

#include <avr/interrupt.h>

#include "gps.h"

#include "serial.h"

#include "../config.h"

#include "led.h"

#include "logger.h"

// Circular buffer for incoming data

uint8_t nmeaBuffer[NMEABUFFER_SIZE];

// Location of parser in the buffer

uint8_t nmeaBufferParsePosition = 0;

// Location of receive byte interrupt in the buffer

volatile uint16_t nmeaBufferDataPosition = 0;

// holds the byte ALREADY PARSED. includes starting character

int bytesReceived = 0;

//data (and checksum) of most recent transmission

char data[16];

//used to skip over bytes during parse

int skipBytes = 0;

//used to index data arrays during data collection

int numBytes = 0;

//variables to store data from transmission

//least significant digit is stored at location 0 of arrays

char tramsmissionType[7];

char timestamp[12];	//hhmmss.ss

char* get_timestamp() 

{

	return timestamp;

}

char latitude[14];	//lllll.lla

char* get_latitudeTrimmed() 

{

}

char* get_latitudeLSBs()

{

}

char longitude[14];	//yyyyy.yyb

char* get_longitudeTrimmed() 

{

}

char* get_longitudeLSBs()

{

}

char quality;		//quality for GGA and validity for RMC

char numSatellites[4];

char* get_sv() 

{

	return numSatellites;

}

char hdop[6];		//xx.x

char* get_hdop() 

{

	return hdop;

}

char altitude[10];	//xxxxxx.x

char* get_gpsaltitude()

{

	return altitude;

}

char wgs84Height[8];	//sxxx.x

char lastUpdated[8];	//blank - included for testing

char stationID[8];	//blank - included for testing

char checksum[3];	//xx

char knots[8];		//xxx.xx

char* get_speedKnots() 

{

	return knots;

}

char course[8];		//xxx.x

char* get_course() 

{

	return course;

}

char dayofmonth[9];	//ddmmyy

char* get_dayofmonth() 

{

	return dayofmonth;

}

bool gps_hadfix = false;

bool gps_hasfix() 

{

	bool hasFix = get_latitudeTrimmed()[0] != 0x00;

	if(hasFix && !gps_hadfix) {

		info_log_msg("Acquired GPS fix");

	}

	else if(!hasFix && gps_hadfix) {

		info_log_msg("Lost GPS fix");

	}

	gps_hadfix = hasFix;

	return hasFix;

}

char variation[9];	//xxx.xb

int calculatedChecksum;

int receivedChecksum;

// transmission state machine

enum decodeState {

	//shared fields

	INITIALIZE=0,

	GET_TYPE,

	GPS_CHECKSUM,	//XOR of all the bytes between the $ and the * (not including the delimiters themselves), written in hexadecimal

	//GGA data fields

	GGA_TIME,

	GGA_LATITUDE,

	GGA_LONGITUDE,

	GGA_QUALITY,

	GGA_SATELLITES,

	GGA_HDOP,

	GGA_ALTITUDE,

	GGA_WGS84,

	GGA_LAST_UPDATE,

	GGA_STATION_ID,

	//RMC data fields

	RMC_TIME,

	RMC_VALIDITY,

	RMC_LATITUDE,

	RMC_LONGITUDE,

	RMC_KNOTS,

	RMC_COURSE,

	RMC_DATE,

	RMC_MAG_VARIATION,

}decodeState;