#!/bin/sh

diff=kamimemo-05v2-encode-patch.vcdiff

v1=`xdelta3 printhdr ${diff} | grep "(source)" | cut -c31-`
v2=`xdelta3 printhdr ${diff} | grep "(output)" | cut -c31-`

# declare argv array and argc is total args from $1..$n + 1 for $0
declare -a argv
declare -i argc force
argc=$#
let "argc++"
let "force = 0"

# build argv array
for (( a=0; a < $argc; a++ ))
do
  case "$a" in
    0)  argv=( "${argv[@]}" "${0##*/}" )
      ;;
    *)  argv=( "${argv[@]}" "${!a}" )
      ;;
  esac
done

if [ $argc -gt 1 ]; then
  case ${argv[1]} in
    -f) let "force++"
      ;;
    *)  echo "Usage: ${argv[0]} [-f]"
        exit 0
      ;;
  esac
fi

proc_main()
{
  #check if v2 file exists and rm if force flag is set
  if [ -f "${v2}" ]; then
    if [ $force -eq 1 ]; then
      echo -n "Removing ${v2} by force..."
      rm -f "${v2}"

      if [ $? -eq 0 ]; then
        echo " done."
      else
        echo " failed returning $?."
        exit 1
      fi
    else
      echo "${v2} exists. Please rm or run with -f argument."
      exit 1
    fi
  fi

  if [ ! -f "${v1}" ]; then
    echo "${v1} does not exist. Make sure ${v1} exists in the same path as ${argv[0]}."
    exit 1
  fi

  echo -n "Patching ${v1} to v2..."
  xdelta3 -qd ${diff}
  tmperr=$?
  case $tmperr in
    0)  if [ -f "${v2}" ]; then
          if [ $force -eq 1 ]; then
            echo " successful. Removing ${v1}"
            rm -f "${v1}"
          else
            echo " successful. ${v1} can be removed now."
          fi
        else
          echo " returned 0 but ${v2} does not exist."
          exit 1
        fi
      ;;
    *)  echo " failed. xdelta3 returned exit code $tmperr"
        exit $tmperr
      ;;
  esac

}

proc_main

exit 0