#!/usr/bin/env bash
#------------------------------------------------------------------------------#
# This file is part of the PALM model system.
#
# PALM is free software: you can redistribute it and/or modify it under the terms
# of the GNU General Public License as published by the Free Software Foundation,
# either version 3 of the License, or (at your option) any later version.
#
# PALM is distributed in the hope that it will be useful, but WITHOUT ANY
# WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
# A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License along with
# PALM. If not, see <http://www.gnu.org/licenses/>.
#
# Copyright 2018-2021  Leibniz Universitaet Hannover
#------------------------------------------------------------------------------#
#
# Current revisions:
# ------------------
#
#
# Former revisions:
# -----------------
# $Id: palm_find_lowest_available_error_number 4843 2021-01-15 15:22:11Z banzhafs $
# Initial revision
#
#------------------------------------------------------------------------------#
# palm_find_lowest_available_error_number does what its name indicates
#------------------------------------------------------------------------------#
SOURCE="${BASH_SOURCE[0]}"
while [ -h "$SOURCE" ]; do # resolve $SOURCE until the file is no longer a symlink
  DIR="$( cd -P "$( dirname "$SOURCE" )" && pwd )"
  SOURCE="$(readlink "$SOURCE")"
  # if $SOURCE was a relative symlink, we need to resolve it
  # relative to the path where the symlink file was located
  [[ $SOURCE != /* ]] && SOURCE="$DIR/$SOURCE"
done
SCRIPT_LOCATION="$( cd -P "$( dirname "$SOURCE" )" && pwd )"

working_dir=$(readlink -f "${SCRIPT_LOCATION}/../../")
trunk_dir=$(readlink -f "${SCRIPT_LOCATION}/../")
source_dir=${trunk_dir}/SOURCE

contains() {
    [[ ${1} =~ (^|[[:space:]])${2}($|[[:space:]]) ]] && return 0 || return 1
}

error_code_prefix="PA"

all_found_error_codes=$(grep -A10 -P "CALL message\( " ${source_dir}/*.f90 \
      | sed -e ':a;N;$!ba;s/ *& *\n */ /g' \
      | grep -P "CALL message\( " \
      | grep -oP "${error_code_prefix}(?<!\d)\d{4}(?!\d)" | sort | uniq -c  \
      | grep -oP "${error_code_prefix}(?<!\d)\d{4}(?!\d)")

for n in {1..9999} ; do
   current_code=$(printf "${error_code_prefix}%04d" $((10#${n})))
   if ! contains "$all_found_error_codes" "$current_code"; then
     echo $current_code
     break
   fi
done