#!/usr/bin/env bash
set -Eeuo pipefail
umask 027

# ==============================================================================
# app-restore.sh
# - Restore from a "run folder" (local dir or rclone remote folder)
# - Applies archives per component (meta/db/wordpress/nextcloud/nextcloud-data/gitea...)
# ==============================================================================

LOG_DIR="/var/log/app-backup"
mkdir -p "$LOG_DIR"
ts="$(date '+%Y-%m-%d_%H-%M-%S')"
LOG_FILE="${LOG_DIR}/app-restore_${ts}.log"
exec > >(tee -a "$LOG_FILE" | systemd-cat -t app-restore -p info) 2>&1

CONFIG_FILE="/etc/app-backup/app-backup.conf"
if [[ -r "$CONFIG_FILE" ]]; then
  # shellcheck disable=SC1090
  source "$CONFIG_FILE"
else
  echo "ERROR: Config not found/readable: $CONFIG_FILE"
  exit 2
fi

: "${WORKDIR:=/var/backups/app-backup}"
: "${RESTORE_ROOT:=${WORKDIR}/restore}"
: "${ARCHIVE_PREFIX:=appbackup}"

: "${RCLONE_BIN:=rclone}"
: "${RCLONE_REMOTE_BASE:=}"


# --- Remote base resolution & crypt enforcement ---
# Prefer explicit RCLONE_REMOTE_BASE from config.
# If only RCLONE_REMOTE is provided (e.g. "OneDriveCrypt:Sicherung"), derive the host folder.
: "${RCLONE_REMOTE:=}"
if [[ -z "${RCLONE_REMOTE_BASE}" ]]; then
  if [[ -n "${RCLONE_REMOTE}" ]]; then
    RCLONE_REMOTE_BASE="${RCLONE_REMOTE%/}/JRITServerBackups/$(hostname -s)"
  fi
fi

require_crypt_remote() {
  local base="$1"
  local remote_name="${base%%:*}"
  [[ -n "${remote_name}" && "${remote_name}" != "${base}" ]] || die "RCLONE_REMOTE_BASE must include an rclone remote prefix like 'OneDriveCrypt:...'. Got: ${base}"
  have "${RCLONE_BIN}" || die "rclone missing"

  # rclone prints full config; we only need the remote block.
  local cfg
  cfg="$("${RCLONE_BIN}" config show "${remote_name}" 2>/dev/null || true)"
  [[ -n "${cfg}" ]] || die "rclone remote '${remote_name}' not found. Check 'rclone listremotes' and your config."

  local typ
  typ="$(printf "%s\n" "${cfg}" | awk -F' = ' '$1=="type"{print $2; exit}')"
  [[ "${typ}" == "crypt" ]] || die "Remote '${remote_name}' is type='${typ:-?}', not 'crypt'. Refusing to restore from non-crypt remote."

  # Enforce filename/directory encryption so OneDrive web does not show cleartext names.
  local fe de
  fe="$(printf "%s\n" "${cfg}" | awk -F' = ' '$1=="filename_encryption"{print $2; exit}')"
  de="$(printf "%s\n" "${cfg}" | awk -F' = ' '$1=="directory_name_encryption"{print $2; exit}')"
  [[ "${fe}" == "standard" ]] || die "Remote '${remote_name}': filename_encryption='${fe:-?}' (expected 'standard'). Otherwise filenames can appear in cleartext."
  [[ "${de}" == "true" ]] || die "Remote '${remote_name}': directory_name_encryption='${de:-?}' (expected 'true'). Otherwise directory names can appear in cleartext."
}

: "${DRY_RUN:=false}"
: "${RESTORE_DB:=true}"
: "${RESTORE_FILES:=true}"
: "${RESTORE_STRICT_DELETE:=false}"

: "${ENABLE_NEXTCLOUD_MAINTENANCE:=true}"
: "${NC_OCC_USER:=apache}"
: "${NC_FILES_SCAN_AFTER_RESTORE:=false}"

: "${ENABLE_GITEA_SERVICE_STOP:=true}"
: "${GITEA_SERVICE_NAME:=gitea}"

: "${ENABLE_HTTPD_STOP:=false}"
: "${HTTPD_SERVICE_NAME:=httpd}"
: "${ENABLE_PHPFPM_STOP:=false}"
: "${PHPFPM_SERVICE_NAME:=php-fpm}"

die() { echo "ERROR: $*"; exit 1; }
have() { command -v "$1" >/dev/null 2>&1; }

run_cmd() { [[ "${DRY_RUN}" == "true" ]] && echo "[DRY_RUN] $*" || "$@"; }

NC_MAINTENANCE_ON=false
nc_maintenance_off() {
  if [[ "${NC_MAINTENANCE_ON}" == "true" ]]; then
    echo "-- Nextcloud maintenance mode OFF (trap)..."
    run_cmd sudo -u "${NC_OCC_USER}" php "${NC_DIR}/occ" maintenance:mode --off || true
    NC_MAINTENANCE_ON=false
  fi
}

GITEA_WAS_STOPPED=false
HTTPD_WAS_STOPPED=false
PHPFPM_WAS_STOPPED=false
gitea_start() { [[ "${GITEA_WAS_STOPPED}" == "true" ]] && { echo "-- Starting gitea (trap)"; run_cmd systemctl start "${GITEA_SERVICE_NAME}" || true; GITEA_WAS_STOPPED=false; }; }
httpd_start() { [[ "${HTTPD_WAS_STOPPED}" == "true" ]] && { echo "-- Starting httpd (trap)"; run_cmd systemctl start "${HTTPD_SERVICE_NAME}" || true; HTTPD_WAS_STOPPED=false; }; }
phpfpm_start(){ [[ "${PHPFPM_WAS_STOPPED}" == "true" ]] && { echo "-- Starting php-fpm (trap)"; run_cmd systemctl start "${PHPFPM_SERVICE_NAME}" || true; PHPFPM_WAS_STOPPED=false; }; }

echo "== app-restore done: ${ts} =="
echo "-- Working dir: ${RUN_DIR}"
echo "-- Log: ${LOG_FILE}"