#!/usr/bin/env bash
# Schedule NPMplus backup via cron (W1-8). Run from project root.
# Usage: bash scripts/maintenance/schedule-npmplus-backup-cron.sh [--install|--show]

set -euo pipefail

SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
PROJECT_ROOT="$(cd "$SCRIPT_DIR/../.." && pwd)"
INSTALL_ROOT="${CRON_PROJECT_ROOT:-$PROJECT_ROOT}"
BACKUP_SCRIPT="$INSTALL_ROOT/scripts/verify/backup-npmplus.sh"
LOG_DIR="$INSTALL_ROOT/logs"
CRON_LINE="0 3 * * * /usr/bin/flock -n /var/lock/npmplus-backup.lock bash -lc 'cd $INSTALL_ROOT && bash $BACKUP_SCRIPT >> $LOG_DIR/npmplus-backup.log 2>&1'"

validate_install_root() {
    if [[ "$INSTALL_ROOT" == /tmp/* ]]; then
        echo "Refusing to install cron from ephemeral path: $INSTALL_ROOT"
        echo "Set CRON_PROJECT_ROOT to a persistent checkout on the host, then rerun."
        exit 1
    fi
    if [[ ! -f "$BACKUP_SCRIPT" ]]; then
        echo "Backup script not found at: $BACKUP_SCRIPT"
        echo "Set CRON_PROJECT_ROOT to the host path that contains scripts/verify/backup-npmplus.sh."
        exit 1
    fi
}

case "${1:-}" in
  --install)
    validate_install_root
    mkdir -p "$LOG_DIR"
    {
      crontab -l 2>/dev/null | grep -v 'backup-npmplus.sh' || true
      echo "$CRON_LINE"
    } | crontab -
    echo "Installed: $CRON_LINE"
    ;;
  --show)
    validate_install_root
    echo "Crontab line: $CRON_LINE"
    ;;
  *)
    echo "Usage: $0 [--install|--show]"
    exit 0
    ;;
esac