import type { Context } from "hono";
import { getConnInfo } from "hono/bun";

/**
 * Best-effort client IP.
 * Prefer x-forwarded-for (set when behind a proxy), fall back to the raw socket
 * address from Bun. In local dev (frontend:5173 → backend:3000, no proxy) this
 * is typically 127.0.0.1 / ::1.
 */
export function getClientIp(c: Context): string {
  const fwd = c.req.header("x-forwarded-for");
  if (fwd) {
    const first = fwd.split(",")[0]?.trim();
    if (first) return first;
  }
  try {
    const addr = getConnInfo(c).remote.address;
    if (addr) return addr;
  } catch {
    /* getConnInfo only works under the Bun adapter */
  }
  return "127.0.0.1";
}

/**
 * Is this IP the local machine? Drives the README rule "si localhost: pas de
 * paywall (tout gratuit)". Covers IPv4 loopback, IPv6 loopback, and the
 * IPv4-mapped-IPv6 form Bun sometimes reports.
 */
export function isLocalhost(ip: string): boolean {
  return (
    ip === "127.0.0.1" ||
    ip === "::1" ||
    ip === "::ffff:127.0.0.1" ||
    ip === "localhost" ||
    ip.startsWith("127.")
  );
}