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

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

log() {
  printf '[%s] %s\n' "$(date '+%F %T')" "$*"
}

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

need_cmd() {
  command -v "$1" >/dev/null 2>&1 || fail "Не найдена команда: $1"
}

bool_norm() {
  case "${1:-}" in
    1|true|TRUE|yes|YES|on|ON) echo "true" ;;
    0|false|FALSE|no|NO|off|OFF) echo "false" ;;
    *) fail "Неверное булево значение: ${1:-<empty>}" ;;
  esac
}

require_root() {
  [[ "$(id -u)" -eq 0 ]] || fail "Скрипт нужно запускать от root"
}

load_env() {
  [[ -f "$ENV_FILE" ]] || fail "Файл окружения не найден: $ENV_FILE"

  set -a
  # shellcheck disable=SC1090
  . "$ENV_FILE"
  set +a

  : "${PGPRO_BIN_DIR:?В .env должна быть переменная PGPRO_BIN_DIR}"
  : "${SERVICE_NAME:?В .env должна быть переменная SERVICE_NAME}"
  : "${PACKAGE_STANDALONE:?В .env должна быть переменная PACKAGE_STANDALONE}"
  : "${PACKAGE_PARALLEL:?В .env должна быть переменная PACKAGE_PARALLEL}"

  REPO_LIST_FILE="${REPO_LIST_FILE:-/etc/apt/sources.list.d/postgresql-1c-18.list}"
  REPO_AUTH_FILE="${REPO_AUTH_FILE:-/etc/apt/auth.conf.d/repo.postgrespro.ru.conf}"
  REPO_GPG_FILE="${REPO_GPG_FILE:-/etc/apt/trusted.gpg.d/postgrespro.gpg}"
  DEFAULT_DATA_DIR="${DEFAULT_DATA_DIR:-/var/lib/pgpro/1c-18/data}"
  DEFAULT_ETC_FILE="${DEFAULT_ETC_FILE:-/etc/default/${SERVICE_NAME}}"
  POSTGRES_SOCKET_DIR="${POSTGRES_SOCKET_DIR:-/var/run/postgresql}"

  UNINSTALL_DISABLE_SERVICE="$(bool_norm "${UNINSTALL_DISABLE_SERVICE:-true}")"
  UNINSTALL_STOP_SERVICE="$(bool_norm "${UNINSTALL_STOP_SERVICE:-true}")"
  UNINSTALL_PURGE_PACKAGES="$(bool_norm "${UNINSTALL_PURGE_PACKAGES:-true}")"
  UNINSTALL_AUTOREMOVE="$(bool_norm "${UNINSTALL_AUTOREMOVE:-true}")"
  UNINSTALL_REMOVE_REPO="$(bool_norm "${UNINSTALL_REMOVE_REPO:-true}")"
  UNINSTALL_REMOVE_AUTH_FILE="$(bool_norm "${UNINSTALL_REMOVE_AUTH_FILE:-true}")"
  UNINSTALL_REMOVE_GPG_KEY="$(bool_norm "${UNINSTALL_REMOVE_GPG_KEY:-true}")"
  UNINSTALL_REMOVE_DEFAULT_FILE="$(bool_norm "${UNINSTALL_REMOVE_DEFAULT_FILE:-false}")"
  UNINSTALL_REMOVE_DATA_DIR="$(bool_norm "${UNINSTALL_REMOVE_DATA_DIR:-false}")"
  UNINSTALL_REMOVE_LOG_DIR="$(bool_norm "${UNINSTALL_REMOVE_LOG_DIR:-false}")"
  UNINSTALL_REMOVE_HOME_DIRS="$(bool_norm "${UNINSTALL_REMOVE_HOME_DIRS:-false}")"
  UNINSTALL_FORCE="$(bool_norm "${UNINSTALL_FORCE:-false}")"
  PGPRO_DATA_DIR="${PGPRO_DATA_DIR:-}"

  PGSETUP="${PGPRO_BIN_DIR}/pg-setup"
  PSQL="${PGPRO_BIN_DIR}/psql"
}

check_os() {
  [[ -f /etc/os-release ]] || fail "Не найден /etc/os-release"
  # shellcheck disable=SC1091
  . /etc/os-release

  [[ "${ID:-}" == "debian" ]] || fail "Скрипт рассчитан на Debian. Найдено: ${ID:-unknown}"
  [[ "${VERSION_ID:-}" == "13" ]] || fail "Скрипт рассчитан на Debian 13. Найдено: ${VERSION_ID:-unknown}"
}

confirm_destructive_actions() {
  if [[ "$UNINSTALL_FORCE" == "true" ]]; then
    return 0
  fi

  if [[ "$UNINSTALL_REMOVE_DATA_DIR" == "true" || "$UNINSTALL_REMOVE_LOG_DIR" == "true" || "$UNINSTALL_REMOVE_HOME_DIRS" == "true" ]]; then
    cat <<EOF
ВНИМАНИЕ: скрипт настроен на удаление данных и/или каталогов Postgres Pro.
Это действие необратимо.

Если вы уверены, введите: DELETE
EOF
    read -r answer
    [[ "$answer" == "DELETE" ]] || fail "Подтверждение не получено, удаление отменено"
  fi
}

run_pgsetup_service() {
  local action="$1"

  if [[ -x "$PGSETUP" ]]; then
    if "$PGSETUP" service "$action" >/dev/null 2>&1; then
      log "Выполнено: pg-setup service $action"
      return 0
    fi
  fi

  if command -v systemctl >/dev/null 2>&1; then
    case "$action" in
      stop)
        systemctl stop "$SERVICE_NAME" >/dev/null 2>&1 || true
        ;;
      disable)
        systemctl disable "$SERVICE_NAME" >/dev/null 2>&1 || true
        ;;
      status)
        systemctl status "$SERVICE_NAME" --no-pager || true
        ;;
    esac
  fi
}

detect_data_dir_from_server() {
  if [[ -x "$PSQL" ]]; then
    if runuser -u postgres -- "$PSQL" -v ON_ERROR_STOP=1 -h "$POSTGRES_SOCKET_DIR" -d postgres -Atqc "SHOW data_directory;" 2>/dev/null; then
      return 0
    fi
  fi
  return 1
}

detect_data_dir() {
  if [[ -n "$PGPRO_DATA_DIR" ]]; then
    printf '%s\n' "$PGPRO_DATA_DIR"
    return 0
  fi

  if [[ -f "$DEFAULT_ETC_FILE" ]]; then
    local from_default
    from_default="$(sed -n 's/^PGDATA=//p' "$DEFAULT_ETC_FILE" | tail -n1)"
    if [[ -n "$from_default" ]]; then
      printf '%s\n' "$from_default"
      return 0
    fi
  fi

  if detect_data_dir_from_server >/dev/null 2>&1; then
    detect_data_dir_from_server
    return 0
  fi

  printf '%s\n' "$DEFAULT_DATA_DIR"
}

remove_packages() {
  [[ "$UNINSTALL_PURGE_PACKAGES" == "true" ]] || {
    log "Удаление пакетов отключено: UNINSTALL_PURGE_PACKAGES=false"
    return 0
  }

  export DEBIAN_FRONTEND=noninteractive

  local pkgs=()
  local pkg
  for pkg in "$PACKAGE_STANDALONE" "$PACKAGE_PARALLEL"; do
    if dpkg-query -W -f='${Status}' "$pkg" 2>/dev/null | grep -q 'install ok installed'; then
      pkgs+=("$pkg")
    fi
  done

  if [[ ${#pkgs[@]} -eq 0 ]]; then
    log "Пакеты PostgreSQL for 1C 18 не найдены, purge пропускаю"
  else
    log "Удаляю пакеты: ${pkgs[*]}"
    apt-get purge -y "${pkgs[@]}"
  fi

  if [[ "$UNINSTALL_AUTOREMOVE" == "true" ]]; then
    log "Запускаю apt-get autoremove"
    apt-get autoremove -y --purge
  fi
}

remove_repo_files() {
  local touched=false

  if [[ "$UNINSTALL_REMOVE_REPO" == "true" && -f "$REPO_LIST_FILE" ]]; then
    rm -f "$REPO_LIST_FILE"
    log "Удален файл репозитория: $REPO_LIST_FILE"
    touched=true
  fi

  if [[ "$UNINSTALL_REMOVE_AUTH_FILE" == "true" && -f "$REPO_AUTH_FILE" ]]; then
    rm -f "$REPO_AUTH_FILE"
    log "Удален auth-файл APT: $REPO_AUTH_FILE"
    touched=true
  fi

  if [[ "$UNINSTALL_REMOVE_GPG_KEY" == "true" && -f "$REPO_GPG_FILE" ]]; then
    rm -f "$REPO_GPG_FILE"
    log "Удален GPG-ключ репозитория: $REPO_GPG_FILE"
    touched=true
  fi

  if [[ "$UNINSTALL_REMOVE_DEFAULT_FILE" == "true" && -f "$DEFAULT_ETC_FILE" ]]; then
    rm -f "$DEFAULT_ETC_FILE"
    log "Удален файл настроек инстанса: $DEFAULT_ETC_FILE"
    touched=true
  fi

  if [[ "$touched" == true ]]; then
    apt-get update || true
  fi
}

remove_data_and_logs() {
  local data_dir
  data_dir="$(detect_data_dir)"

  if [[ "$UNINSTALL_REMOVE_DATA_DIR" == "true" ]]; then
    if [[ -n "$data_dir" && -d "$data_dir" ]]; then
      rm -rf --one-file-system "$data_dir"
      log "Удален каталог данных: $data_dir"
    else
      log "Каталог данных не найден, удаление пропускаю: ${data_dir:-<empty>}"
    fi
  fi

  if [[ "$UNINSTALL_REMOVE_LOG_DIR" == "true" ]]; then
    local log_dir="/var/lib/pgpro/1c-18"
    if [[ -d "$log_dir" ]]; then
      rm -rf --one-file-system "$log_dir"
      log "Удален каталог логов/служебных файлов: $log_dir"
    else
      log "Каталог логов не найден, удаление пропускаю: $log_dir"
    fi
  fi

  if [[ "$UNINSTALL_REMOVE_HOME_DIRS" == "true" ]]; then
    local opt_dir="/opt/pgpro/1c-18"
    if [[ -d "$opt_dir" ]]; then
      rm -rf --one-file-system "$opt_dir"
      log "Удален каталог /opt: $opt_dir"
    else
      log "Каталог /opt не найден, удаление пропускаю: $opt_dir"
    fi
  fi
}

show_summary() {
  local data_dir
  data_dir="$(detect_data_dir)"

  cat <<EOF

Удаление завершено.

Что сделано:
- остановка сервиса: ${UNINSTALL_STOP_SERVICE};
- отключение автозапуска: ${UNINSTALL_DISABLE_SERVICE};
- purge пакетов: ${UNINSTALL_PURGE_PACKAGES};
- autoremove: ${UNINSTALL_AUTOREMOVE};
- удаление APT-репозитория: ${UNINSTALL_REMOVE_REPO};
- удаление auth-файла репозитория: ${UNINSTALL_REMOVE_AUTH_FILE};
- удаление GPG-ключа репозитория: ${UNINSTALL_REMOVE_GPG_KEY};
- удаление /etc/default-файла инстанса: ${UNINSTALL_REMOVE_DEFAULT_FILE};
- удаление каталога данных: ${UNINSTALL_REMOVE_DATA_DIR}${data_dir:+ (${data_dir})};
- удаление каталога /var/lib/pgpro/1c-18: ${UNINSTALL_REMOVE_LOG_DIR};
- удаление каталога /opt/pgpro/1c-18: ${UNINSTALL_REMOVE_HOME_DIRS}.

Проверки:
  systemctl status ${SERVICE_NAME} || true
  dpkg -l | grep postgrespro || true
  ls -la /etc/apt/sources.list.d/ | grep postgresql-1c-18 || true
EOF
}

main() {
  require_root
  need_cmd apt-get
  need_cmd dpkg-query
  need_cmd sed
  need_cmd grep
  need_cmd rm
  need_cmd runuser

  load_env
  check_os
  confirm_destructive_actions

  if [[ "$UNINSTALL_STOP_SERVICE" == "true" ]]; then
    run_pgsetup_service stop
  fi

  if [[ "$UNINSTALL_DISABLE_SERVICE" == "true" ]]; then
    run_pgsetup_service disable
  fi

  remove_packages
  remove_repo_files
  remove_data_and_logs
  show_summary
}

main "$@"