#!/bin/bash
# Puts a route to GPS Handheld
# The route is simplified to contain less points on the way
#
# This software is beta, use at your own risk!
# Please update the settings below "Settungs" to suit your needs
# 
# TODO
# - currently nothing open
#
#      Version: $LastChangedRevision: 330 $
#  last change: $LastChangedDate: 2009-05-26 20:54:40 +0200 (Tue, 26 May 2009) $
#  (c) 2009 by Robert Lange (robert.lange@s1999.tu-chemnitz.de)
#  GNU General Public Licence applies
#

# *** Settings ***
# Simplification algorithm: Remove points in the range of 10m
#                           deviation from projected line
SIMPLIFY="crosstrack,error=0.010k"
# Simplification algorithm: Reduce to 300 points
# SIMPLIFY="count=300"
# see gpsbabel documentation for details
# GPS Device, as supported by gpsbabel
GPS_TYPE="garmin"
# GPS Port
GPS_PORT="/dev/ttyUSB0"


# *** Settings you usually don't wanna change ***
# GPSbabel executable
GPSBABEL=gpsbabel
# wget executable
WGET=wget

# Program name (no need to change)
PROGNAME=map2navi
# Route name (set from command line)
ROUTENAME=
# URL/GPX File (set from command line)
URL_GPX=


# *** Functions ***
# *** Command line parsing
get_options() {
  local opt
  local argcounter=1

  while [ -n "$*" ] ; do
      opt="$1"
      shift
      case $opt in
          -V|--version)
          # Version output
          REVISION='$LastChangedRevision: 330 $'
          REVISION=${REVISION#\$LastChangedRevision: }
          REVISION=${REVISION%\$}
          echo "$PROGNAME, Revision $REVISION"
          echo "(c) by Robert Lange (robert.lange@s1999.tu-chemnitz.de)"
          echo "GNU General Public Licence applies"
          exit 0
          ;;
          -h|--help|'-?')
          # help text
          echo "$PROGNAME - Put a route to GPS Handheld"
          echo "This software is beta, use at your own risk!"
          echo
          echo "The route is simplified to contain less points on the way"
	  echo "Performed steps: Fetch route, convert to gpx, store on device"
	  echo "Used programs: gpsbabel, wget"
	  echo "Input can be a Google Maps URL or a GPX file,"
          echo "e.g. from http://openrouteservice.de/"
          echo
          echo "Call: $PROGNAME [OPTS] route_name {'url'|file.gpx}"
          echo
          echo "Options:"
          echo "  [-h|--help] - This screen"
          echo "  [-V|--version] - Print program version and exit"
          echo "  route_name - Name of the resulting route"
          echo "  url - Google Maps URL from the \"Link\" button"
          echo "        Don't forget to quote this URL"
          echo "  file.gpx - GPX file containing a track (called \"Route\","
          echo "             must end in .gpx"
          exit 0
        ;;
          *)
          # Store into 
     	  case $argcounter in
      	    1)
      		ROUTENAME=$opt
      		;;
      	    2)
      		URL_GPX=$opt
      		;;
      	    *)
                  # Too many arguments
  	        echo "Too many arguments! See help text for usage"
  		exit 1
  		;;
      	  esac
          #increment argument counter
          let argcounter++
      	;;
      esac
  done
}

# *** Call Command Line Parsing
# When no options supplied then call help
if [ -z "$1" ]; then
    get_options "--help"
else
    get_options "$@"
fi

# *** Sanity Checks ***
# Parameter
if [ -z "$URL_GPX" ]; then
   echo "No URL or file suppled! See help text for usage"
   exit 1
fi
# gpsbabel there?
if [ $(which $GPSBABEL > /dev/null) ]; then
   echo "$GPSBABEL executable not found!"
   exit 1
fi
# wget there?
if [ $(which $WGET > /dev/null) ]; then
   echo "$WGET executable not found!"
   exit 1
fi

if [ ${URL_GPX##*.} != "gpx" ]; then
   # *** For URL: Fetch Google MAPs URL to String
   echo "$WGET -o /dev/null -O - ${URL_GPX}&output=kml"
   KMLFILE="$($WGET -o /dev/null -O - ${URL_GPX}\&output=kml)"
   if [ $? -ne 0 ]; then
      echo "Failure invoking $WGET - Aborting"
      exit 1
   fi
   # *** For URL: Convert & Simplify KML
   echo $GPSBABEL -i kml -f - -x simplify,$SIMPLIFY -o gpx -F -
   GPXFILE="$(echo $KMLFILE | $GPSBABEL -i kml -f - -x simplify,$SIMPLIFY -o gpx -F -)"
   if [ $? -ne 0 ]; then
      echo "Failure invoking $GPSBABEL - Aborting"
      exit 1
   fi

# *** For GPX: Simplify GPX
else
  echo $GPSBABEL -i gpx -f $URL_GPX -x simplify,$SIMPLIFY -o gpx -F -
  GPXFILE="$($GPSBABEL -i gpx -f $URL_GPX -x simplify,$SIMPLIFY -o gpx -F -)"
  if [ $? -ne 0 ]; then
     echo "Failure invoking $GPSBABEL - Aborting"
     exit 1
  fi
fi


# *** Rename route
GPXFILE=${GPXFILE//<name>Route<\/name>/<name>${ROUTENAME}<\/name>}

# *** Store to GPS Handheld
echo -n "The track contains "
echo -n $(echo "$GPXFILE" | grep "</trkpt>" | wc -l)
echo " points"

echo $GPSBABEL -D 1 -t -i gpx -f - -o $GPS_TYPE -F $GPS_PORT
echo "$GPXFILE" | $GPSBABEL -D 1 -t -i gpx -f - -o $GPS_TYPE -F $GPS_PORT
if [ $? -ne 0 ]; then
   echo "Failure invoking $GPSBABEL - Aborting"
   exit 1
fi

# *** Done
echo
echo "Done - Downloaded track \"$ROUTENAME\" to $GPS_TYPE"
echo