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

SCRIPT_DIR="$(cd -- "$(dirname -- "${BASH_SOURCE[0]}")" && pwd)"
CFG="$SCRIPT_DIR/config.sh"
[[ -f "$CFG" ]] || { echo "ERROR: config.sh fehlt: $CFG (erst 01_setup.sh ausführen)"; exit 1; }
# shellcheck disable=SC1090
source "$CFG"

# User, der das Script gestartet hat (auch wenn via sudo)
RUN_USER="${SUDO_USER:-$USER}"

LOG_FILE="$SCRIPT_DIR/raspi-backup.log"

host_short(){ hostname -s 2>/dev/null || hostname 2>/dev/null || echo "raspi"; }
nas_alias(){ echo "${ALIAS_PREFIX}-$(host_short)"; }

# validate config vars (OHNE SSH_USER)
: "${NAS_HOST:?}" "${NAS_USER:?}" "${NAS_PORT:?}" "${NAS_BACKUP_BASE:?}" "${KEY_TYPE:?}" "${ALIAS_PREFIX:?}"

hn="$(host_short)"
alias="$(nas_alias)"
remote_root="${NAS_BACKUP_BASE%/}/${hn}"

echo "== Backup Status =="
echo "Script-Ordner : $SCRIPT_DIR"
echo "Run user      : $RUN_USER"
echo "Host          : $hn"
echo "NAS           : ${NAS_USER}@${NAS_HOST}:${NAS_PORT}"
echo "Remote Root   : $remote_root"
echo "Log           : $LOG_FILE"
echo

# Log-Info (letzter Lauf)
if [[ -f "$LOG_FILE" ]]; then
  echo "-- Letzter Log-Block (kurz) --"
  if grep -q "BACKUP START" "$LOG_FILE"; then
    tail -n 120 "$LOG_FILE" | tail -n 25
  else
    tail -n 25 "$LOG_FILE"
  fi
  echo
else
  echo "Noch kein Log vorhanden."
  echo
fi

echo "-- NAS Check --"
echo "Alias (nur Info): $alias"
echo "Hinweis: Status nutzt direkten SSH Host/Port/User/Key."
echo

# Keypfad für RUN_USER
key_path="$(eval echo "~${RUN_USER}/.ssh/id_${KEY_TYPE}_${hn}")"

if [[ ! -f "$key_path" ]]; then
  echo "Local Key fehlt: $key_path"
  echo "=> erst 02_setup_ssh.sh ausführen."
  exit 0
fi

SSH_BASE=(ssh -p "$NAS_PORT" -i "$key_path"
  -o IdentitiesOnly=yes
  -o BatchMode=yes
  -o StrictHostKeyChecking=yes
  -o ConnectTimeout=10
)

# Remote listing
if sudo -u "$RUN_USER" "${SSH_BASE[@]}" "${NAS_USER}@${NAS_HOST}" "test -d '$remote_root'" >/dev/null 2>&1; then
  echo "Remote erreichbar: OK"
  echo

  echo "-- Remote Inhalt --"
  sudo -u "$RUN_USER" "${SSH_BASE[@]}" "${NAS_USER}@${NAS_HOST}" "ls -la '$remote_root' | sed -n '1,40p'"
  echo

  echo "-- latest Ziel + Größe (wenn vorhanden) --"
  sudo -u "$RUN_USER" "${SSH_BASE[@]}" "${NAS_USER}@${NAS_HOST}" \
    "if [ -L '$remote_root/latest' ]; then \
       echo -n 'latest -> '; readlink '$remote_root/latest' || true; \
       echo -n 'Size(latest): '; du -sh '$remote_root/latest' 2>/dev/null || echo 'n/a'; \
     else \
       echo 'Kein latest Symlink vorhanden.'; \
     fi"
else
  echo "Remote erreichbar: FAIL"
  echo "Check:"
  echo " - NAS erreichbar? IP/Port"
  echo " - SSH Key installiert?"
  echo " - Rechte auf $remote_root"
fi