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

# Pack local folders into tar archives on NAS, then optionally remove local source.
# Default mode is DRY-RUN.
#
# Example:
#   scripts/ops/netgescon-pack-to-nas.sh \
#     --nas-dir /mnt/nas_netgescon/migrazioni-locali/tar-exports \
#     --source /home/michele/backup-completo \
#     --source /var/www/netgescon_OLD
#
#   scripts/ops/netgescon-pack-to-nas.sh \
#     --nas-dir /mnt/nas_netgescon/migrazioni-locali/tar-exports \
#     --source /home/michele/backup-completo \
#     --apply --purge-source

NAS_DIR="/mnt/nas_netgescon/migrazioni-locali/tar-exports"
APPLY="no"
PURGE_SOURCE="no"
TS="$(date +%Y%m%d-%H%M%S)"

declare -a SOURCES=()

die() {
  echo "Error: $*" >&2
  exit 1
}

usage() {
  cat <<'EOF'
Usage:
  netgescon-pack-to-nas.sh --source <path> [--source <path> ...] [options]

Options:
  --source <path>       Source directory to archive (repeatable)
  --nas-dir <path>      Destination folder on NAS for tar files
  --apply               Create archives (default is dry-run)
  --purge-source        Delete local source directory after successful archive
  -h, --help            Show help
EOF
}

while [[ $# -gt 0 ]]; do
  case "$1" in
    --source)
      SOURCES+=("$2")
      shift 2
      ;;
    --nas-dir)
      NAS_DIR="$2"
      shift 2
      ;;
    --apply)
      APPLY="yes"
      shift
      ;;
    --purge-source)
      PURGE_SOURCE="yes"
      shift
      ;;
    -h|--help)
      usage
      exit 0
      ;;
    *)
      usage
      die "Unknown option: $1"
      ;;
  esac
done

[[ ${#SOURCES[@]} -gt 0 ]] || { usage; die "At least one --source is required"; }
[[ -d "$NAS_DIR" ]] || mkdir -p "$NAS_DIR"

if [[ "$PURGE_SOURCE" == "yes" && "$APPLY" != "yes" ]]; then
  die "--purge-source requires --apply"
fi

echo "== NetGescon Pack to NAS =="
echo "Mode: $( [[ "$APPLY" == "yes" ]] && echo "APPLY" || echo "DRY-RUN" )"
echo "Purge source: $PURGE_SOURCE"
echo "NAS dir: $NAS_DIR"
echo

for src in "${SOURCES[@]}"; do
  if [[ ! -d "$src" ]]; then
    echo "Skip missing source: $src"
    continue
  fi

  src_abs="$(readlink -f "$src")"
  parent_abs="$(dirname "$src_abs")"
  src_name="$(basename "$src_abs")"
  parent_name="$(basename "$parent_abs")"

  safe_name="${parent_name}__${src_name}__${TS}.tar"
  tar_path="$NAS_DIR/$safe_name"

  echo "------------------------------------------------------------"
  echo "Source: $src_abs"
  echo "Archive: $tar_path"
  du -sh "$src_abs" || true

  if [[ "$APPLY" == "yes" ]]; then
    tar -cpf "$tar_path" -C "$parent_abs" "$src_name"
    sync
    ls -lh "$tar_path"

    if [[ "$PURGE_SOURCE" == "yes" ]]; then
      echo "[PURGE] Removing source: $src_abs"
      rm -rf "$src_abs"
    fi
  fi

done

echo "Done."