# Utility functions/macros for logging

_VERBOSITY="INFO"
_VERBOSITIES="ERROR WARNING INFO DEBUG"

function list_contains() {
  if [ $# -ne 2 ]; then
    _log "FATAL" "Invalid number of argument! \
      (${BASH_SOURCE[1]##*/} ${BASH_LINENO[0]}::list_contains())"
    exit 127
  fi

  local list=$1
  local obj=$2

  for word in $list; do
    [ "$word" == "$obj" ] && return 0
  done
  return 1
}

function set_verbority() {
  if [ $# -ne 1 ]; then
    _log "FATAL" "Invalid number of argument! \
      (${BASH_SOURCE[1]##*/} ${BASH_LINENO[0]}::set_verbority())"
    exit 127
  fi

  local verb=$1

  if list_contains "$_VERBOSITIES" "$1"; then
    _VERBOSITY=$verb
  else
    _log "FATAL" "Invalid verbosity level specified: '$1'"
    exit 127
  fi
}

# Return 0 if current VERBISITY is greater equal than the argument
function check_verbosity() {
  if [ $# -ne 1 ]; then
    _log "FATAL" "Invalid number of argument! \
      (${BASH_SOURCE[1]##*/} ${BASH_LINENO[0]}::check_verbosity())"
    exit 127
  fi

  local verb=$1

  for verbosity in $_VERBOSITIES; do
    if [ "$verbosity" == "$verb" ]; then
      return 0
    elif [ "$_VERBOSITY" == "$verbosity" ]; then
      return 1
    fi
  done

  return 1
}

function _log() {
  local level=$1
  shift
  local messages=$@
  printf "[%-7s] %s\n" "$level" "$messages"
}

function log() {
  if [ $# -ne 2 ]; then
    _log "FATAL" "Invalid number of argument! \
      (${BASH_SOURCE[1]##*/} ${BASH_LINENO[0]}::log())"
    exit 127
  fi

  local level=$1
  shift
  local messages=$@

  list_contains "$_VERBOSITIES" "$level"
  if [ $? -ne 0 ]; then
    _log "FATAL" "Invalid verbosity level specified: '$1'"
    exit 127
  fi

  if check_verbosity $level; then
    _log "$level" "$messages"
  fi
}