#!/bin/bash

# Copyright (C) 2008 Lonnie Abelbeck
# This is free software, licensed under the GNU General Public License
# version 3 as published by the Free Software Foundation; you can
# redistribute it and/or modify it under the terms of the GNU
# General Public License; and comes with ABSOLUTELY NO WARRANTY.
#
# weather.agi
#
# Speak Weather from XML data from arg 1 url
# Using only asterisk "extras" sound files
#
# 01-06-2007, created
# 03-03-2007, qualify windchill and heat_index by temp_f
# 04-29-2007, require windchill_f < temp_f < heat_index_f

# Usage: (Replace "KMLE" using http://www.weather.gov/data/current_obs/)
#exten => s,1,Answer
#exten => s,n,Playback(extras/weather)
#exten => s,n,AGI(weather.agi,http://www.weather.gov/data/current_obs/KMLE.xml)
#exten => s,n,Hangup
#

# [read AGI variables]
while read -e ARG && [ "${ARG}" ] ; do :; done # ignore agi_ variables

# Copy url for XML host and clean it
URL=`echo $1 | sed -e 's/"//g'`

# Define the location of the "extras" sound files.
# Use an empty string (EXTRAS="") if they are not in a separate directory.
# A person could also define a custom set of sounds just for weather.agi.
EXTRAS="custom-sounds/extras/"

# [results function]
checkresults() {
    while read line
    do
    case ${line:0:4} in
    "200 " ) return;;
    "510 " ) return;;
    "520 " ) return;;
    *      ) ;;                     #keep on reading those Invlid command
                                    #command syntax until "520 End ..."
    esac
    done
}

# [main]
# Get XML elements
# Note: the data values must be on the same line as the opening tag.
# curl --silent "$URL"   should also work.
DATA=`wget -q -O - "$URL" | \
    grep -E '(<weather[ >]|<temp_f[ >]|<wind_degrees[ >]|<wind_mph[ >]|<wind_gust_mph[ >]|<heat_index_f[ >]|<windchill_f[ >])'`
if [ "${DATA}" = "" ]; then
    echo "STREAM FILE ${EXTRAS}were-sorry #"
    checkresults
    exit 0
fi

# Define a default prefix to define any missing tags
DATA="NA</>"`echo $DATA`

# Text Values
WEATHER=`echo $DATA | \
    sed -e 's/^.*<weather[ >]//' -e 's/<.*$//' -e 's/^.*>//'`

DATA=`echo $DATA | sed -e 's/ //g'`
# Numeric Values (truncate floats to integers)
TEMP_F=`echo $DATA | \
    sed -e 's/^.*<temp_f[ >]//' -e 's/<.*$//' -e 's/\..*$//' -e 's/^.*>//'`
WINDCHILL_F=`echo $DATA | \
    sed -e 's/^.*<windchill_f[ >]//' -e 's/<.*$//' -e 's/\..*$//' -e 's/^.*>//'`
HEAT_INDEX_F=`echo $DATA | \
    sed -e 's/^.*<heat_index_f[ >]//' -e 's/<.*$//' -e 's/\..*$//' -e 's/^.*>//'`
WIND_DEGREES=`echo $DATA | \
    sed -e 's/^.*<wind_degrees[ >]//' -e 's/<.*$//' -e 's/\..*$//' -e 's/^.*>//'`
WIND_MPH=`echo $DATA | \
    sed -e 's/^.*<wind_mph[ >]//' -e 's/<.*$//' -e 's/\..*$//' -e 's/^.*>//'`
WIND_GUST_MPH=`echo $DATA | \
    sed -e 's/^.*<wind_gust_mph[ >]//' -e 's/<.*$//' -e 's/\..*$//' -e 's/^.*>//'`

if [ `echo $WEATHER | grep -c -i "thunderstorm"` -ne 0 ]; then
    echo "STREAM FILE ${EXTRAS}thunderstorm #"
    checkresults
    sleep 1
elif [ `echo $WEATHER | grep -c -i "rain"` -ne 0 ]; then
    if [ `echo $WEATHER | grep -c -i "freezing"` -ne 0 ]; then
        echo "STREAM FILE ${EXTRAS}freezing #"
        checkresults
    fi
    echo "STREAM FILE ${EXTRAS}rain #"
    checkresults
    if [ `echo $WEATHER | grep -c -i "snow"` -ne 0 ]; then
        echo "STREAM FILE ${EXTRAS}snow #"
        checkresults
    fi
    sleep 1
elif [ `echo $WEATHER | grep -c -i "snow"` -ne 0 ]; then
    echo "STREAM FILE ${EXTRAS}snow #"
    checkresults
    sleep 1
elif [ `echo $WEATHER | grep -c -i "mist"` -ne 0 ]; then
    echo "STREAM FILE ${EXTRAS}wx/mist #"
    checkresults
    sleep 1
elif [ `echo $WEATHER | grep -c -i "fog"` -ne 0 ]; then
    echo "STREAM FILE ${EXTRAS}foggy #"
    checkresults
    sleep 1
elif [ `echo $WEATHER | grep -c -i "windy"` -ne 0 ]; then
    echo "STREAM FILE ${EXTRAS}windy #"
    checkresults
    sleep 1
fi

if [[ "${TEMP_F:0:1}" == [-0-9] ]]; then
    echo "STREAM FILE ${EXTRAS}wx/temperature #"
    checkresults
    echo "SAY NUMBER ${TEMP_F} #"
    checkresults
    echo "STREAM FILE ${EXTRAS}degrees #"
    checkresults
fi

if [[ "${WINDCHILL_F:0:1}" == [-0-9] && "${TEMP_F}" -lt 50 ]]; then
    if [[ "${WINDCHILL_F}" -lt "${TEMP_F}" ]]; then
        sleep 1
        echo "STREAM FILE ${EXTRAS}wx/wind-chill #"
        checkresults
        echo "SAY NUMBER ${WINDCHILL_F} #"
        checkresults
    fi
elif [[ "${HEAT_INDEX_F:0:1}" == [0-9] && "${TEMP_F}" -gt 80 ]]; then
    if [[ "${HEAT_INDEX_F}" -gt "${TEMP_F}" ]]; then
        sleep 1
        echo "STREAM FILE ${EXTRAS}wx/heat-index #"
        checkresults
        echo "SAY NUMBER ${HEAT_INDEX_F} #"
        checkresults
    fi
fi

sleep 1

#
# Note: the octet of directions are not evenly spaced at 45 degrees.
# North and South are 70 degrees wide
# East and West are 50 degrees wide
# The remaining are 30 degrees wide
#
# This arangement gives me a better mental image of the prevailing winds.
# Different locations might want to augment this.
#
if [[ "${WIND_DEGREES:0:1}" != [0-9] ]]; then
    : # ignore NA wind direction
elif [[ "${WIND_DEGREES}" -gt 35 && "${WIND_DEGREES}" -lt 65 ]]; then
    echo "STREAM FILE ${EXTRAS}wx/northeast #"
    checkresults
elif [[ "${WIND_DEGREES}" -ge 65 && "${WIND_DEGREES}" -le 115 ]]; then
    echo "STREAM FILE ${EXTRAS}east #"
    checkresults
elif [[ "${WIND_DEGREES}" -gt 115 && "${WIND_DEGREES}" -lt 145 ]]; then
    echo "STREAM FILE ${EXTRAS}wx/southeast #"
    checkresults
elif [[ "${WIND_DEGREES}" -gt 215 && "${WIND_DEGREES}" -lt 245 ]]; then
    echo "STREAM FILE ${EXTRAS}wx/southwest #"
    checkresults
elif [[ "${WIND_DEGREES}" -ge 245 && "${WIND_DEGREES}" -le 295 ]]; then
    echo "STREAM FILE ${EXTRAS}west #"
    checkresults
elif [[ "${WIND_DEGREES}" -gt 295 && "${WIND_DEGREES}" -lt 325 ]]; then
    echo "STREAM FILE ${EXTRAS}wx/northwest #"
    checkresults
elif [[ "${WIND_DEGREES}" -ge 90 && "${WIND_DEGREES}" -le 270 ]]; then
    echo "STREAM FILE ${EXTRAS}south #"
    checkresults
else
    echo "STREAM FILE ${EXTRAS}north #"
    checkresults
fi
echo "STREAM FILE ${EXTRAS}wx/winds #"
checkresults

if [[ "${WIND_MPH:0:1}" == [0-9] ]]; then
    echo "SAY NUMBER ${WIND_MPH} #"
    checkresults
else
    echo "SAY NUMBER 0 #"
    checkresults
fi
echo "STREAM FILE ${EXTRAS}miles-per-hour #"
checkresults

if [[ "${WIND_GUST_MPH:0:1}" == [0-9] ]]; then
    sleep 1
    echo "STREAM FILE ${EXTRAS}wx/gusting-to #"
    checkresults
    echo "SAY NUMBER ${WIND_GUST_MPH} #"
    checkresults
fi

exit 0