#!/bin/bash

# downloads files specified in spec files

DORECOMPRESS=""
while test $# -gt 0; do
  case $1 in
    *-recompress)
      if [ "$2" == "yes" ]; then
        DORECOMPRESS="yes"
      fi
      shift
    ;;
    *-outdir)
      MYOUTDIR="$2"
      shift
    ;;
    *)
      echo Unknown parameter $1.
      echo 'this service is not accepting parameters currently'
      exit 1
    ;;
  esac
  shift
done

if [ ! -d "$MYOUTDIR" ]; then
  echo "ERROR: output directory does not exist"
  exit 1
fi

function uncompress_file() {
  local input=$1
  local output=$2

  UNCOMPRESS="cat"
  BASENAME="$input"
  if [ "${input%.gz}" != "$input" ]; then
    UNCOMPRESS="gunzip -c"
    BASENAME="${input%.gz}"
  elif [ "${input%.tgz}" != "$input" ]; then
    UNCOMPRESS="gunzip -c"
    BASENAME="${input%.tgz}.tar"
  elif [ "${input%.bz2}" != "$input" ]; then
    UNCOMPRESS="bunzip2 -c"
    BASENAME="${input%.bz2}"
  elif [ "${FILE%.xz}" != "$input" ]; then
    UNCOMPRESS="xz -dc"
    BASENAME="${input%.xz}"
  fi

  $UNCOMPRESS "$input" > "$output"
  echo $BASENAME
}

RETURN=0
for i in *.spec; do
  [ "$i" == "*.spec" ] && exit 0

  for url in `perl -I/usr/lib/build -MBuild -e Build::show /usr/lib/build/configs/default.conf "$i" sources`; do
    PROTOCOL="${url%%:*}"
    if [ "$PROTOCOL" != "http" -a "$PROTOCOL" != "https" -a "$PROTOCOL" != "ftp" ]; then
      continue
    fi
    cd "$MYOUTDIR"
    if [ -z "$DORECOMPRESS" ]; then
      if ! /usr/bin/wget -4 --no-check-certificate -q "$url"; then
        echo "ERROR: Fail to download $url"
        exit 1
      fi
      RECOMPRESS=""
      FILE="${url##*/}"
    else
      FORMAT="${url##*\.}"
      if /usr/bin/wget -4 --no-check-certificate -q "$url"; then
        RECOMPRESS=""
        FILE="${url}"
      elif /usr/bin/wget -4 --no-check-certificate -q "${url%$FORMAT}gz"; then
        RECOMPRESS="$FORMAT"
        FILE="${url%$FORMAT}gz"
      elif /usr/bin/wget -4 --no-check-certificate -q "${url%$FORMAT}bz2"; then
        RECOMPRESS="$FORMAT"
        FILE="${url%$FORMAT}bz2"
      elif /usr/bin/wget -4 --no-check-certificate -q "${url%$FORMAT}xz"; then
        RECOMPRESS="$FORMAT"
        FILE="${url%$FORMAT}xz"
      else
        echo "ERROR: Fail to download $url or any other compression format"
        exit 1
      fi
      FILE="${FILE##*/}"
    fi

    # remove all file files which are indendical to committed files
    [ -f "$OLDPWD/$FILE" ] && cmp "$FILE" "$OLDPWD/$FILE" && rm "$FILE"

    if [ -n "$RECOMPRESS" ]; then
      tempfile=`mktemp`
      file_name=`uncompress_file "$FILE" "$tempfile"`

      # uncompress the old file also to compare
      tempoldfile=`mktemp`
      uncompress_file "$OLDPWD/${url##*/}" "$tempoldfile" > /dev/null

      # do not create new file, if identical
      if ! cmp "$tempfile" "$tempoldfile"; then
        if [ "$RECOMPRESS" == "gz" ]; then
          COMPRESS="gzip -c -"
          SUFFIX=".gz"
        elif [ "$RECOMPRESS" == "bz2" ]; then
          COMPRESS="bzip2 -c -"
          SUFFIX=".bz2"
        elif [ "$RECOMPRESS" == "xz" ]; then
          COMPRESS="xz -c -"
          SUFFIX=".xz"
        elif [ "$RECOMPRESS" == "none" ]; then
          COMPRESS="cat -"
          SUFFIX=""
        else
          echo "ERROR: Unknown compression $RECOMPRESS"
          RETURN=1
        fi

        # do the compression
        cat "$tempfile" | $COMPRESS > "$file_name$SUFFIX" || RETURN=1
        rm "$FILE" # remove downloaded file
      fi

      # cleanup
      rm -f "$tempfile" "$tempoldfile"
    fi
    cd -
  done
done

exit $RETURN