import { NextResponse } from "next/server";
import nodemailer from "nodemailer";
import { requireAdmin } from "@/lib/admin-auth";

export const dynamic = "force-dynamic";

export async function GET(request: Request) {
  const check = await requireAdmin();
  if (check instanceof NextResponse) return check;

  const config = {
    host: process.env.SMTP_HOST ?? "(nicht gesetzt)",
    port: Number(process.env.SMTP_PORT ?? 587),
    user: process.env.SMTP_USER ?? "(nicht gesetzt)",
    from: process.env.SMTP_FROM ?? "(nicht gesetzt)",
    to: process.env.SMTP_TO ?? "(nicht gesetzt)",
  };

  const transport = nodemailer.createTransport({
    host: config.host,
    port: config.port,
    secure: false,
    auth: { user: process.env.SMTP_USER, pass: process.env.SMTP_PASS },
    connectionTimeout: 10000,
    greetingTimeout: 8000,
    socketTimeout: 12000,
    tls: { rejectUnauthorized: false },
  });

  try {
    await transport.verify();
    await transport.sendMail({
      from: `"MBO Tech IT TEST" <${process.env.SMTP_FROM}>`,
      to: process.env.SMTP_TO,
      subject: `✓ SMTP-Test erfolgreich – ${new Date().toLocaleString("de-DE")}`,
      text: "Diese Test-Mail wurde automatisch von /api/admin/smtp-test gesendet.\n\nSMTP-Verbindung und Mail-Versand funktionieren korrekt.",
      html: `<p style="font-family:sans-serif">Test von <code>/api/admin/smtp-test</code></p><p style="color:green;font-weight:bold">✓ SMTP-Verbindung und Mail-Versand funktionieren korrekt.</p>`,
    });
    return NextResponse.json({
      ok: true,
      message: "SMTP-Verbindung erfolgreich – Test-Mail gesendet",
      config: { ...config, pass: "***" },
    });
  } catch (err) {
    const e = err as Error & { code?: string; command?: string };
    return NextResponse.json(
      {
        ok: false,
        error: e.message,
        code: e.code,
        command: e.command,
        config: { ...config, pass: "***" },
      },
      { status: 500 }
    );
  }
}