set -e # exit on error

SCRIPT_NAME="APACHE LINKER"                     # script name
JENKINS_ROOT=${HUDSON_HOME:-"/var/lib/jenkins"}     # set default if HUDSON_HOME is missing
HUDSON_PUBLIC="$JENKINS_ROOT/public"            # public folder
HUDSON_BUILDS="$JENKINS_ROOT/builds"            # builds folder
HUDSON_BUILDS_JOBDIR="$HUDSON_BUILDS/$JOB_NAME" # builds jobdir folder
HUDSON_PUBLIC_JOBDIR="$HUDSON_PUBLIC/$JOB_NAME" # public jobdir folder

if [ -z "$JOB_NAME" ]; then
  echo "[$SCRIPT_NAME]: JOB_NAME does not exist"
  exit 1
fi

MODULES="../../jobs/$JOB_NAME/modules"
TARGET="./"
COMMIT="$(git rev-parse HEAD)"
#BRANCHES="$(for branch in $(git branch -a | grep -v "(no branch)" | cut -c 3-); do [ "$(git rev-parse $branch)" == "$(git rev-parse HEAD)" ] && echo "$(basename $branch)"; done | uniq -u)"
BRANCHES="$(for branch in $(git branch -a | grep -v "(no branch)" | cut -c 3-); do [ "$(git rev-parse $branch)" == "$(git rev-parse HEAD)" ] && echo "$(basename $branch)"; done | uniq)"
BUILD_DATES=""

send_message() {
  local message=$*
  echo -n "[$SCRIPT_NAME] "
  echo "$message"
}

send_message_nl() {
  echo "[$SCRIPT_NAME] ."
}

send_message_info() {
  local message=$*
  echo -n "[$SCRIPT_NAME] "
  echo "$message"
}

send_message_error() {
  local message=$*
  echo -n "[$SCRIPT_NAME]: "
  echo "$message"
}

send_message "------------------------------------------------------------------------"
send_message "RUN $SCRIPT_NAME"
send_message "------------------------------------------------------------------------"


if [ ! -d "$HUDSON_PUBLIC_JOBDIR" ]; then
  mkdir -p "$HUDSON_PUBLIC_JOBDIR" ];
fi

send_message_info "Entering Jenkins public folder $HUDSON_PUBLIC_JOBDIR"
cd "$HUDSON_PUBLIC_JOBDIR"
send_message_info "Fetching active symlinks ..."

for modulepath in $(ls -d $MODULES/*/); do
  buildspath="${modulepath}builds"
  builddate="$(ls $buildspath | sort -r | head -n 1)"
  buildpath="$buildspath/$builddate"

  if [ ! -d "$HUDSON_BUILDS_JOBDIR" ]; then
    mkdir -p "$HUDSON_BUILDS_JOBDIR"
  fi

  cp -arfp "$buildpath" "$HUDSON_BUILDS_JOBDIR"
  for file in $(find $buildpath -name '*.zip'); do
    filename="$(basename $file)"
    relativepath="../../builds/$JOB_NAME${file#$buildspath}"
    ln -sf "$relativepath" "$TARGET$filename"

    for branch in $BRANCHES; do
      ln -sf "$relativepath" "$TARGET$JOB_NAME-$branch-bin.zip"
    done
  done
done

SYMLINK_TARGETS="$(ls -l "$HUDSON_PUBLIC_JOBDIR" | awk -F "-> " '{print $2}' | cut -d"/" -f5 | uniq)"
BUILD_DATES="$(find $HUDSON_BUILDS_JOBDIR/??*/ -maxdepth 0 -type d)"
if [ -n "$BUILD_DATES" ]; then
  if [ ! -d "$HUDSON_BUILDS_JOBDIR" ]; then
    send_message_error "BUILD directory $HUDSON_BUILDS_JOBDIR does not exist"
    exit 1
  fi

  send_message_info "Current active build-dates for $JOB_NAME:"
  for build in $BUILD_DATES; do
    build=${build/$HUDSON_BUILDS_JOBDIR\//}
    build=${build/%\//}
    send_message_info ". $build"
  done
  send_message_nl

  send_message_info "Entering builds directory $HUDSON_BUILDS_JOBDIR"
  cd "$HUDSON_BUILDS_JOBDIR"
  send_message_info "Looking for inactive build folders ..."

  for directory in $BUILD_DATES; do
    ACTIVE_BUILD=0
    directory=${directory/$HUDSON_BUILDS_JOBDIR\//} # remove HUDSON_BUILDS_JOBDIR from string
    directory=${directory/%\//} # remove trailing slash
    for build in $SYMLINK_TARGETS; do
      if [ "$directory" == "$build" ]; then
         send_message_info "Found active build: $build skip deletion"
         ACTIVE_BUILD=1
         break
      fi
    done

    if [ "${directory:0:1}" == "/" ]; then
      send_message_error "directory starts with a slash! Possible script failure detected. Exiting ..."
      exit 1
    fi

    if [ "${#directory}" -le 4 ]; then
      send_message_error "directory has a length that is less or equal four! Possible script failure detected. Exiting ..."
      exit 1
    fi

    if [ $ACTIVE_BUILD -eq 0 ]; then
      send_message_info "Deleting unused build folder: $directory"
      rm -Rf ./"${directory}"
    fi
  done
fi

send_message "------------------------------------------------------------------------"

exit 0