#!/bin/bash
# fix_pragma_dns.command
# macOS temporary DNS fix for pragma.academic-ruc.cc

set -e

HOSTS="/etc/hosts"
DOMAIN="pragma.academic-ruc.cc"
CF_IP="104.21.2.164"

if [ "$(id -u)" -ne 0 ]; then
  echo ""
  echo "=== pragma DNS temporary fix ==="
  echo "Need administrator permission. Enter your Mac login password:"
  echo ""
  sudo "$0"
  exit $?
fi

echo ""
echo "Domain: $DOMAIN"
echo "Cloudflare IP: $CF_IP"
echo "This script adds a temporary hosts entry and flushes DNS cache."
echo ""

if grep -q "$DOMAIN" "$HOSTS"; then
  echo "Existing hosts entry:"
  grep "$DOMAIN" "$HOSTS"
  echo ""
  echo "No changes made. Remove the old entry manually if it is outdated."
else
  printf "\n# Cloudflare pragma - temporary DNS fix\n%s %s\n" "$CF_IP" "$DOMAIN" >> "$HOSTS"
  echo "Added: $CF_IP $DOMAIN"
fi

echo ""
echo "Flushing DNS cache..."
dscacheutil -flushcache || true
killall -HUP mDNSResponder 2>/dev/null || true

echo "Done. Restart your browser, Claude Code, Codex CLI, or Cherry Studio."
echo ""
echo "Press any key to close..."
read -r -n 1