#!/usr/bin/env bash
# Standard include for Prole etc scripts.
# - Loads values from PROLE_CONF/prole.cfg (INI-style)
# - Does not override already-set env vars

if [[ "${_PROLE_CFG_LOADED:-}" == "1" ]]; then
  return 0 2>/dev/null || true
fi
_PROLE_CFG_LOADED=1

_prole_cfg_script_dir=$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)
_prole_cfg_home_guess=$(cd "$_prole_cfg_script_dir/.." && pwd)

_prole_trim() {
  local s="$1"
  s="${s#"${s%%[![:space:]]*}"}"
  s="${s%"${s##*[![:space:]]}"}"
  printf '%s' "$s"
}

_PROLE_CFG_SET_VARS="|"

_prole_cfg_set_default() {
  local key="$1" value="$2" token="|$key|"
  if [[ -z "${!key:-}" || "$_PROLE_CFG_SET_VARS" == *"$token"* ]]; then
    printf -v "$key" '%s' "$value"
    export "$key"
    if [[ "$_PROLE_CFG_SET_VARS" != *"$token"* ]]; then
      _PROLE_CFG_SET_VARS="${_PROLE_CFG_SET_VARS}${key}|"
    fi
  fi
}

_prole_read_cfg() {
  local cfg="$1" line key value
  while IFS= read -r line || [[ -n "$line" ]]; do
    line="$(_prole_trim "$line")"
    [[ -z "$line" ]] && continue
    case "$line" in
      \#*|\;*|\[*\])
        continue
        ;;
    esac
    if [[ "$line" == *"="* ]]; then
      key="$(_prole_trim "${line%%=*}")"
      value="$(_prole_trim "${line#*=}")"
      [[ -z "$key" ]] && continue
      _prole_cfg_set_default "$key" "$value"
    fi
  done <"$cfg"
}

_prole_cfg_file=""
if [[ -n "${PROLE_CONF:-}" && -f "$PROLE_CONF/prole.cfg" ]]; then
  _prole_cfg_file="$PROLE_CONF/prole.cfg"
elif [[ -n "${PROLE_HOME:-}" && -f "$PROLE_HOME/conf/prole.cfg" ]]; then
  _prole_cfg_file="$PROLE_HOME/conf/prole.cfg"
elif [[ -f "$_prole_cfg_home_guess/conf/prole.cfg" ]]; then
  _prole_cfg_file="$_prole_cfg_home_guess/conf/prole.cfg"
fi

if [[ -n "$_prole_cfg_file" ]]; then
  if [[ -z "${PROLE_CONF:-}" ]]; then
    PROLE_CONF=$(cd "$(dirname "$_prole_cfg_file")" && pwd)
    export PROLE_CONF
  fi
  _prole_read_cfg "$_prole_cfg_file"
fi

if [[ -z "${PROLE_HOME:-}" && -d "$_prole_cfg_home_guess" ]]; then
  PROLE_HOME="$_prole_cfg_home_guess"
  export PROLE_HOME
fi

unset _prole_cfg_script_dir
unset _prole_cfg_home_guess
unset _prole_cfg_file
unset _PROLE_CFG_SET_VARS