#!/usr/bin/env bash
set -euo pipefail

ROOT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd -P)"
ENV_FILE="${ENV_FILE:-${ROOT_DIR}/.env}"

fail() {
  printf '%s\n' "$1" >&2
  exit 1
}

[[ -f "$ENV_FILE" ]] || fail "$ENV_FILE not found"
[[ ! -L "$ENV_FILE" ]] || fail "$ENV_FILE must not be a symbolic link"

read_env_value() {
  local key="$1"
  local value
  value="$(sed -n "s/^${key}=//p" "$ENV_FILE" | tail -n 1)"
  case "$value" in
    \"*\") value="${value#\"}"; value="${value%\"}" ;;
    \'*\') value="${value#\'}"; value="${value%\'}" ;;
  esac
  printf '%s\n' "$value"
}

bind_address="$(read_env_value PANEL_APP_BIND_ADDRESS)"
[[ "$bind_address" =~ ^[0-9]{1,3}(\.[0-9]{1,3}){3}$ ]] || fail "PANEL_APP_BIND_ADDRESS must be an IPv4 address"
IFS=. read -r octet1 octet2 octet3 octet4 <<< "$bind_address"
for octet in "$octet1" "$octet2" "$octet3" "$octet4"; do
  ((10#$octet <= 255)) || fail "PANEL_APP_BIND_ADDRESS contains an invalid IPv4 octet"
done

echo "[whois:init] memory-only cache requires no server-side initialization."