#!/usr/bin/env sh
# restore-config.sh
# Lista y restaura backups creados por start.sh (config.local.yml.bak.YYYYMMDDHHMMSS)

set -e

WORKDIR="$(pwd)"
BACKUP_GLOB="$WORKDIR/config.local.yml.bak.*"
DEST="$WORKDIR/config.local.yml"

usage() {
  cat <<EOF
Usage: $0 [--list] [--latest] [--restore <file>] [--yes]

Options:
  --list         List available backup files
  --latest       Show the latest backup file (implies --list)
  --restore FILE Restore the specified backup into config.local.yml
  --yes          Skip confirmation when restoring

Examples:
  $0 --list
  $0 --latest
  $0 --restore ./config.local.yml.bak.20251001102251
  $0 --restore latest --yes
EOF
}

list_backups() {
  ls -1 $BACKUP_GLOB 2>/dev/null | sort || true
}

latest_backup() {
  # sort by name (timestamp suffix) and pick last
  ls -1 $BACKUP_GLOB 2>/dev/null | sort | tail -n 1 || true
}

if [ "$#" -eq 0 ]; then
  usage
  exit 0
fi

FORCE=0
MODE=""
TARGET=""

while [ "$#" -gt 0 ]; do
  case "$1" in
    --list)
      MODE=list; shift ;;
    --latest)
      MODE=latest; shift ;;
    --restore)
      MODE=restore; TARGET="$2"; shift 2 ;;
    --yes)
      FORCE=1; shift ;;
    -h|--help)
      usage; exit 0 ;;
    *)
      echo "Unknown arg: $1" >&2; usage; exit 1 ;;
  esac
done

case "$MODE" in
  list)
    echo "Backups:";
    list_backups;
    exit 0
    ;;
  latest)
    echo "Latest backup:";
    latest_backup;
    exit 0
    ;;
  restore)
    if [ "$TARGET" = "latest" ] || [ -z "$TARGET" ]; then
      TARGET=$(latest_backup)
    fi
    if [ -z "$TARGET" ] || [ ! -f "$TARGET" ]; then
      echo "No backup found to restore: $TARGET" >&2
      exit 1
    fi

    echo "About to restore backup: $TARGET -> $DEST"
    if [ "$FORCE" -ne 1 ]; then
      printf "Continue and overwrite %s? [y/N]: " "$DEST"
      read ans || true
      case "$ans" in
        y|Y|yes|YES)
          ;; 
        *)
          echo "Aborted."; exit 1 ;;
      esac
    fi

    cp "$TARGET" "$DEST"
    echo "Restored $TARGET -> $DEST"
    exit 0
    ;;
  *)
    usage; exit 1 ;;
esac