#!/bin/bash

#grib file request script
#20200102 km4ack

clear;echo;echo;echo
echo "Large = 10 degrees"
echo "Medium = 6 degrees"
echo "Small = 2 degrees"

read -p "large, medium, or small? l/m/s " ANS
echo;echo "processing the data"

if [ $ANS = "l" ]
then
AREA=5
elif [ $ANS = "m" ]
then
AREA=3
elif [ $ANS = "s" ]
then
AREA=1
fi

GPS=$(gpspipe -r -n 10 | grep G\.GGA)

LAT=$(echo $GPS | awk -F "," '{printf "%.0f \n", $3 }' | cut -c1-2)
LATD=$(echo $GPS | awk -F "," '{print $4}')
LON=$(echo $GPS | awk -F "," '{printf "%.0f \n", $5 }' | cut -c1-2)
LOND=$(echo $GPS | awk -F "," '{print $6}')

echo "======raw gps data======"
echo $GPS
echo "=====data we need to work with======"
echo "Lat="$LAT$LATD
echo "LON="$LON$LOND

echo "=====NEW DATA======"
#do some math
let NEWLATADD=$LAT+$AREA
let NEWLONADD=$LON+$AREA
let NEWLATSUB=$LAT-$AREA
let NEWLONSUB=$LON-$AREA


echo "addition"
echo $NEWLATADD$LATD
echo $NEWLONADD$LOND
echo "subtraction"
echo $NEWLATSUB$LATD
echo $NEWLONSUB$LOND

#example of correct format
# send gfs:40N,60N,140W,120W|2,2|24,48,72|PRESS,WIND

echo;echo;
echo "address the email to query@saildocs.com"
echo "enter request as the email subject"
echo "enter the line below into the email body"
echo "send gfs:"$NEWLATSUB$LATD","$NEWLATADD$LATD","$NEWLONADD$LOND","$NEWLONSUB$LOND"|2,2|24,48,72|PRESS,WIND"