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

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

SOURCE_BASE_DIR="/dockervolumes"
BACKUP_ROOT="/dockerbackups"
CONTAINERS_FILE="$SCRIPT_ROOT/containers.txt"
BACKUP_HOSTNAME="$(hostname -s)"
BACKUP_METHODS="rclone smb"
KEEP_COUNT=5
PULL_IMAGES=1
START_TIMEOUT=90
WAIT_INTERVAL=3
START_RETRIES=1
LOCK_FILE="/run/lock/zorruno-docker-backup.lock"
ZSTD_EXTRA_OPTS="-T0 -12"
MQTT_REPORT_ENABLED=0
MQTT_HOST=""
MQTT_PORT=1883
MQTT_USERNAME=""
MQTT_PASSWORD_FILE=""
MQTT_STATUS_TOPIC="viewroad-status/dockerbackup/$BACKUP_HOSTNAME"
MQTT_COMMAND_TOPIC="viewroad-commands/dockerbackup/$BACKUP_HOSTNAME/run"

RCLONE_ENABLED=0
RCLONE_REMOTE=""
RCLONE_HOST_SUBDIR=1
RCLONE_EXTRA_ARGS=""
SMB_ENABLED=0
SMB_MOUNT=""
SMB_HOST_SUBDIR=1
SMB_RSYNC_ARGS="-a"

if [[ -f "$ENV_FILE" ]]; then
  set -a
  # shellcheck disable=SC1090
  . "$ENV_FILE"
  set +a
fi

# Ease migration from the original prune script's .env names.
if [[ -n "${SOURCE_DIR:-}" && "$BACKUP_ROOT" == "/dockerbackups" ]]; then
  BACKUP_ROOT="$SOURCE_DIR"
fi

timestamp() { date '+%F %T'; }
log() {
  local line
  line="$(timestamp) [$1] $2"
  printf '%s\n' "$line" >&2
  if [[ -n "${BACKUP_RUN_LOG:-}" ]]; then
    printf '%s\n' "$line" >>"$BACKUP_RUN_LOG"
  fi
return 0
}
die() { log ERROR "$1"; exit "${2:-1}"; }

is_true() {
  case "${1,,}" in
    1|true|yes|on|enabled) return 0 ;;
    *) return 1 ;;
  esac
}

require_command() {
  command -v "$1" >/dev/null 2>&1 || die "Required command not found: $1" 3
}

require_positive_integer() {
  [[ "$2" =~ ^[1-9][0-9]*$ ]] || die "$1 must be a positive integer (received: $2)" 2
}

resolve_path() {
  if [[ "$1" = /* ]]; then printf '%s\n' "$1"; else printf '%s/%s\n' "$SCRIPT_ROOT" "$1"; fi
}

run_id() { date '+%Y-%m-%d_%H-%M-%S'; }