#!/bin/bash
# core/validator.sh - unified option validation.
#
# The primary validation still happens inline inside parse_arguments and
# show_menu (migrated verbatim, to preserve the exact error messages and the
# "already installed" guards). validate_options() is a final, idempotent
# safety net: it re-checks only options that are still set, using the same
# regexes and messages, so it can never change a valid install path.

# Validate a single value against an ERE.
#   $1 = value, $2 = regex, $3 = error message
is_valid() {
  local val="$1" regex="$2" msg="$3"
  if [[ "${val}" =~ ${regex} ]]; then
    return 0
  fi
  echo "${CWARNING}${msg}${CEND}"
  return 1
}

# Re-validate options that are still set after parse/menu. Empty options
# (e.g. unset because already installed) are skipped.
validate_options() {
  _check_opt() {
    # $1 = value, $2 = regex, $3 = message
    [ -z "$1" ] && return 0
    is_valid "$1" "$2" "$3" || error_exit "$3"
  }

  _check_opt "${nginx_option}"       '^[1-2]$'            "nginx_option input error! Please only input number 1~2"
  _check_opt "${php_option}"          '^[1-3]$'             "php_option input error! Please only input number 1~3"
  _check_opt "${mphp_ver}"            '^(74|80|81)$'          "mphp_ver input error! Please only input number 74/80/81"
  # On Ubuntu 24+ only PHP 8.x is supported; PHP 7.4 (and the mphp 7.4 build)
  # fails to compile against the newer system libicu.
  if [[ "${Family}" == "ubuntu" ]] && [ "${Ubuntu_ver:-0}" -ge 24 ]; then
    [ "${php_option}" == '1' ] && error_exit "PHP 7.4 is not supported on Ubuntu ${Ubuntu_ver}+, please choose PHP 8.x (option 2 or 3)"
    [ "${mphp_ver}" == '74' ] && error_exit "mphp 7.4 is not supported on Ubuntu ${Ubuntu_ver}+, please choose 80 or 81"
  fi
  _check_opt "${db_option}"           '^[1-9]$'             "db_option input error! Please only input number 1~9"
  _check_opt "${dbinstallmethod}"     '^[1-2]$'            "dbinstallmethod input error! Please only input number 1~2"
}