#!/usr/bin/env bash

#command line options:
debug=0
for arg in "$@"; do
  if [ "${arg}" == "-d" ]; then debug=1; echo debug mode 1; fi
done

bootscript="/etc/initscripts/ankiinit"
if [ ! -e $bootscript ]; then
  echo $bootscript does not exist
  exit 1
fi

echo modifying boot script...
tmpfile="ankiinitmod"; rm -f $tmpfile
modified=0; linecnt=0
while IFS='' read -r line || [[ -n "$line" ]]; do #https://stackoverflow.com/questions/10929453/read-a-file-line-by-line-assigning-the-value-to-a-variable
  linecnt=$((linecnt+1))
  
  #detect if we already modified this script
  if [[ $line = *"boot helper"* ]] && [ $modified -lt 1 ]; then
    modified=1;
    echo $bootscript already helpified!
  fi
  
  #insert helper boot code just before exit
  if [[ $line = *"exit 0"* ]] && [ $modified -lt 1 ]; then
    modified=1
    echo adding helper modifications
    echo "" >> $tmpfile
    echo "#boot helper" >> $tmpfile
    echo "mount -o exec,remount /data" >> $tmpfile
    echo "cd /data/local/fixture" >> $tmpfile
    echo "./helper > /dev/null 2> /dev/null < /dev/null &" >> $tmpfile
    echo "" >> $tmpfile
  fi
  
  echo $line >> $tmpfile
done < $bootscript

#point of no return!
echo remove robot process boot target...
systemctl stop anki-robot.target
rm -f /etc/systemd/system/default.target #systemctl disable anki-robot.target
echo updating boot script...
chmod +x $tmpfile
cp -f $tmpfile $bootscript
chmod +x $bootscript

#remove unused bins -- make space for cert files
echo cleaning anki fs...
find /anki ! -name 'certs.zip' -type f -exec rm -rfd {} +
sync

if [ $debug -gt 0 ]; then echo found $linecnt lines; fi
if [ $debug -lt 1 ]; then rm -f $tmpfile; fi

exit 0