#!/bin/bash
#
# jsroute, a utility to route via Google Maps using Envjs.
#
# We take a starting point and a destination as arguments, and
# pass them off to a Javascript file (route.js) which is compiled
# on-the-fly using Mozilla's Rhino Javascript compiler. Then, magic
# occurs, and the JSON results are output to the command line.
#
# Soon the output will be piped through a Python script to convert
# it to (usable) KML.
#

# Some exit codes.
EXIT_MISSING_START=1
EXIT_MISSING_DESTINATION=2
EXIT_HELP=3
EXIT_GETOPT_UNHAPPY=4
EXIT_TOO_MANY_ARGS=5


# Empty by default.
ROUTENAME=""

# A function which just displays the usage information.
function usage {
    echo ""
    echo "Usage: $0 [-h] [-n \"name\"] \"<start>\" \"<destination>\""
    echo ""
    echo "ARGUMENTS"
    echo "  <start>,       Your starting location. Use quotes."
    echo "  <destination>, Your destination. Use quotes."
    echo ""
    echo "OPTIONS"
    echo "  -h,            Show the usage information and bail."
    echo "  -n <name>,     Give the route a meaningful name. Use quotes."
    echo ""
}


while getopts "hn:" option; do
  case $option in
      n ) ROUTENAME="$OPTARG";
	  # Shift the number of remaining arguments down by two,
	  # so that the non-option parameters are accessible via
	  # $1, $2, etc.
	  shift $((OPTIND-1));;
      h ) usage;
	  exit $EXIT_HELP;;
      * ) usage;
	  exit $EXIT_GETOPT_UNHAPPY;;
  esac
done


# The non-option parameters.
START=$1
DESTINATION=$2

# Dollarsign-octothorpe contains the number of parameter arguments.
if [ "$#" -gt 2 ]; then
    echo "Error: too many arguments. Maybe you forgot to place the source and destination in quotes?"
    usage;
    exit $EXIT_TOO_MANY_ARGS
fi

if [ "$START" == "" ]; then
    usage;
    exit $EXIT_MISSING_START
fi

if [ "$DESTINATION" == "" ]; then
    usage;
    exit $EXIT_MISSING_DESTINATION
fi

if [ "$ROUTENAME" == "" ]; then
    # Set it to a default of "<start> to <destination>".
    ROUTENAME="$START to $DESTINATION"
fi

java -jar ../lib/env-js/rhino/js.jar -opt -1 route.js "$1" "$2"