#!/usr/bin/env bash
# Schedule cron to check explorer indexer lag and run fix when lag > threshold.
# Run from project root. Use a host that can reach RPC and Blockscout (and SSH to r630-02 for fix).
# Usage: bash scripts/maintenance/schedule-explorer-lag-cron.sh [--install|--show|--remove]

set -euo pipefail

SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
PROJECT_ROOT="$(cd "$SCRIPT_DIR/../.." && pwd)"
INSTALL_ROOT="${CRON_PROJECT_ROOT:-$PROJECT_ROOT}"
LAG_SCRIPT="$INSTALL_ROOT/scripts/maintenance/check-and-fix-explorer-lag.sh"
LOG_DIR="$INSTALL_ROOT/logs"
LOG_FILE="$LOG_DIR/explorer-lag-fix.log"

# Every 6 hours (0:00, 6:00, 12:00, 18:00)
CRON_LAG="0 */6 * * * cd $INSTALL_ROOT && bash $LAG_SCRIPT >> $LOG_FILE 2>&1"

validate_install_root() {
  if [[ "$INSTALL_ROOT" == /tmp/* ]]; then
    echo "Refusing to install cron from ephemeral path: $INSTALL_ROOT"
    echo "Set CRON_PROJECT_ROOT to a persistent checkout on the host, then rerun."
    exit 1
  fi
  if [[ ! -f "$LAG_SCRIPT" ]]; then
    echo "Lag script not found at: $LAG_SCRIPT"
    echo "Set CRON_PROJECT_ROOT to the host path that contains scripts/maintenance/check-and-fix-explorer-lag.sh."
    exit 1
  fi
}

case "${1:-}" in
  --install)
    validate_install_root
    mkdir -p "$LOG_DIR"
    {
      crontab -l 2>/dev/null | grep -v "check-and-fix-explorer-lag.sh" || true
      echo "$CRON_LAG"
    } | crontab -
    echo "Installed explorer lag cron (every 6 hours):"
    echo "  $CRON_LAG"
    echo "Log: $LOG_FILE"
    ;;
  --show)
    validate_install_root
    echo "Explorer lag check-and-fix (every 6 hours):"
    echo "  $CRON_LAG"
    echo "Log: $LOG_FILE"
    echo "Threshold: set EXPLORER_INDEXER_LAG_THRESHOLD (default 500) in crontab or env."
    ;;
  --remove)
    if crontab -l 2>/dev/null | grep -q "check-and-fix-explorer-lag.sh"; then
      crontab -l 2>/dev/null | grep -v "check-and-fix-explorer-lag.sh" | crontab -
      echo "Removed explorer lag cron."
    else
      echo "No explorer lag cron found in crontab."
    fi
    ;;
  *)
    echo "Usage: $0 [--install|--show|--remove]"
    exit 0
    ;;
esac