#!/usr/bin/env bash
# ==============================================================================
# Hermes Agent Backup Script
# ==============================================================================
# Works for both local and Docker deployments.
#
# Usage:  backup-hermes.sh
#         backup-hermes.sh --cold
# ==============================================================================

set -euo pipefail

SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
source "${SCRIPT_DIR}/common.sh"
parse_args "$@"

SERVICE_NAME="hermes"
BASE_DIR="/opt/${SERVICE_NAME}"
BACKUP_DIR="/opt/backup"
STAMP="$(date +%Y%m%d-%H%M%S)"
BACKUP_FILE="${BACKUP_DIR}/backup-${SERVICE_NAME}-${STAMP}.tar.gz"

[[ -d "$BASE_DIR" ]] || fatal "Hermes is not deployed at ${BASE_DIR}."

mkdir -p "$BACKUP_DIR"

# --- Cold backup: stop service ---
if [[ "$ARG_COLD" == "1" ]]; then
    info "Running cold backup (stopping service)..."
    if [[ -f "${BASE_DIR}/docker-compose.yml" ]]; then
        (cd "$BASE_DIR" && docker compose down)
    elif systemctl is-active --quiet "${SERVICE_NAME}.service" 2>/dev/null; then
        systemctl stop "${SERVICE_NAME}.service"
    fi
fi

# --- Create archive (no traefik config for hermes) ---
info "Creating archive..."
tar czf "$BACKUP_FILE" -C / "opt/${SERVICE_NAME}"

# --- Cold: restart ---
if [[ "$ARG_COLD" == "1" ]]; then
    if [[ -f "${BASE_DIR}/docker-compose.yml" ]]; then
        (cd "$BASE_DIR" && docker compose up -d)
    elif [[ -f "/etc/systemd/system/${SERVICE_NAME}.service" ]]; then
        systemctl start "${SERVICE_NAME}.service"
    fi
    ok "Service restarted."
fi

# --- Rotate old backups (keep last 5) ---
# shellcheck disable=SC2012
ls -t "${BACKUP_DIR}/backup-${SERVICE_NAME}-"*.tar.gz 2>/dev/null | tail -n +6 | xargs -r rm --

ok "Backup: ${BACKUP_FILE} ($(du -h "$BACKUP_FILE" | cut -f1))"