#!/bin/sh

 ##############################################################################
 #                                                                            #
 # Copyright (C) 2010 by Michal Hrusecky <Michal@Hrusecky.net>                #
 #                                                                            #
 # This program is free software: you can redistribute it and/or modify       #
 # it under the terms of the GNU General Public License as published by       #
 # the Free Software Foundation, either version 3 of the License, or          #
 # (at your option) any later version.                                        #
 #                                                                            #
 # This program is distributed in the hope that it will be useful,            #
 # but WITHOUT ANY WARRANTY; without even the implied warranty of             #
 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the              #
 # GNU General Public License for more details.                               #
 #                                                                            #
 # You should have received a copy of the GNU General Public License          #
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.      #
 #                                                                            #
 ##############################################################################

TITLE="Auto"
EMAIL="Michal@Hrusecky.net"
PASS="supersecret"
RECENT=10

export LANG="C"

AUTH="`curl --silent https://www.google.com/accounts/ClientLogin -d Email=$EMAIL -d "Passwd=$PASS" -d source=cmdlineapp -d accountType=HOSTED -d service=writely | sed -n 's|Auth=||p'`"

DATA="`curl --silent --header "Authorization: GoogleLogin auth=$AUTH" "https://docs.google.com/feeds/documents/private/full?title=$TITLE&title-exact=true"`"

if [ -z "`echo "$DATA" | grep "<openSearch:totalResults>1</openSearch:totalResults>"`" ]; then
   echo "Too many results!!!"
   exit 1
fi

DOCID="`echo "$DATA" | sed 's|.*docId=\([^&'"'"'"]\+\)[&'"'"'"].*|\1|' | head -n 1`"

if [ -z "$DOCID" ]; then
   echo "Can't find docId!!!"
   exit 1
fi

DATA="`curl --silent --header "Authorization: GoogleLogin auth=$AUTH" "https://docs.google.com/feeds/download/documents/Export?docId=$DOCID" | grep '^PET'`"

[ -z "$RECENT" ] || DATA="`echo "$DATA" | tail -n "$RECENT"`"

LITERS="`echo "$DATA" | sed -e 's|^\(PET:[0-9]*:[0-9]*:[0-9]\+.[0-9]\)l|\10l|' \
                            -e 's|^\(PET:[0-9]*:[0-9]*:[0-9]\+\)l|\1.00l|'`"
LITERS="`echo "$LITERS" | sed 's|^PET:[0-9]*:[0-9]*:\([0-9]\+\).\([0-9][0-9]\)l|\1\2\ +|' | sed 's|+.*|+|' | head -n -1`"
LITERS="`echo $LITERS` 0"
LITERS="`expr $LITERS`"

KM_S="`echo "$DATA" | sed -n 's|^PET:\([0-9]\+\):.*|\1|p' | head -n 1`"
KM_E="`echo "$DATA" | sed -n 's|^PET:\([0-9]\+\):.*|\1|p' | tail -n 1`"

KM="`expr $KM_E - $KM_S`"

echo "Consumption: `expr \( $LITERS \* 10 \) / $KM | sed 's|\([0-9]\)$|.\1|'`l/100km"