#!/bin/bash - 

# $Author: jeffr $
# $Date: 2023-12-16 08:53:50 -0500 (Sat, 16 Dec 2023) $
# $Revision: 3 $

# Make sure latitude and longitude have been provided
if [ $# -ne 2 ] ; then
	echo Usage $0 latitude longitude
	exit 1
fi
 
# Create some temp files for the data
temp1=$(mktemp /tmp/weather.XXXXXXXXX)
temp2=$(mktemp /tmp/weather.XXXXXXXXX)
temp3=$(mktemp /tmp/weather.XXXXXXXXX)
temp4=$(mktemp /tmp/weather.XXXXXXXXX)
temp5=$(mktemp /tmp/weather.XXXXXXXXX)
temp6=$(mktemp /tmp/weather.XXXXXXXXX)

# Get the weather content
lynx -dump -nolist http://forecast.weather.gov/MapClick.php?lat=$1\&lon=$2> $temp1

# Check to see if the latitude/longitude was valid
if [ $(grep -c "unavailable for the requested location" $temp1) -gt 0 ] ; then
	echo "Couldn't get weather for the specified latitude/longitude ($1/$2). Quitting."
	rm $temp1 $temp2 $temp3
	exit 1
fi

# Get number of lines in the file
no_lines=$(wc -l $temp1 | awk -F" " '{ print $1 }')

# Process the top of the weather content
tail_line=$(grep -n "Current conditions at" $temp1 | awk -F":" '{ print $1 }')
tail_val=$(( $no_lines - $tail_line + 1))
tail -n $tail_val $temp1 | less > $temp2

# Process the bottom of the weather content
head_line=$(grep -n "Additional Forecasts and Information" $temp2 | awk -F":" '{ print $1 }')
head_val=$(( $head_line - 1))
head -n $head_val $temp2 > $temp3

# Remove unnecessary lines
sed '/More Information:*/d' $temp3 > $temp4
sed '/Local Forecast Office*/d' $temp4 > $temp5
sed '/Weather Forecast*/d' $temp5 > $temp6

# Add a header and output the result
echo Weather generated $(date) by $(whoami)@$(hostname). ; echo
cat $temp6

# Clean up
rm $temp1 $temp2 $temp3 $temp4 $temp5 $temp6