import type { APIRoute } from 'astro';
import {
  getNewsletterDb,
  getRuntimeEnv,
  readEnv,
  required,
  type NewsletterSubscriber,
} from '../../../lib/newsletter';

export const prerender = false;

async function unsubscribeByToken(
  locals: unknown,
  token: string,
): Promise<'ok' | 'missing' | 'not_found' | 'no_db'> {
  if (!token) return 'missing';

  const runtimeEnv = getRuntimeEnv(locals);
  const mode = (readEnv('NEWSLETTER_MODE', runtimeEnv) || readEnv('CONTACT_FORM_MODE', runtimeEnv) || 'dev').toLowerCase();

  if (mode !== 'live') {
    console.info('[newsletter:dev] Unsubscribe token received', { token: token.slice(0, 8) + '…' });
    return 'ok';
  }

  const db = getNewsletterDb(runtimeEnv);
  if (!db) return 'no_db';

  const row = await db
    .prepare(
      `SELECT * FROM newsletter_subscribers
       WHERE unsubscribe_token = ?
       LIMIT 1`,
    )
    .bind(token)
    .first<NewsletterSubscriber>();

  if (!row) return 'not_found';

  if (row.status !== 'unsubscribed') {
    await db
      .prepare(
        `UPDATE newsletter_subscribers
         SET status = 'unsubscribed',
             unsubscribed_at = datetime('now'),
             confirm_token = NULL
         WHERE id = ?`,
      )
      .bind(row.id)
      .run();
  }

  return 'ok';
}

export const GET: APIRoute = async ({ locals, url }) => {
  const token = required(url.searchParams.get('token'));
  const result = await unsubscribeByToken(locals, token);

  if (result === 'no_db') {
    return new Response('Newsletter database binding NEWSLETTER_DB is not configured.', {
      status: 500,
    });
  }

  const path =
    result === 'ok' ? '/newsletter/disiscrizione' : '/newsletter/disiscrizione-errore';
  return Response.redirect(new URL(path, url).toString(), 303);
};

export const POST: APIRoute = async ({ request, locals, url }) => {
  const form = await request.formData();
  const token = required(form.get('token')) || required(url.searchParams.get('token'));
  const result = await unsubscribeByToken(locals, token);

  if (result === 'no_db') {
    return new Response('Newsletter database binding NEWSLETTER_DB is not configured.', {
      status: 500,
    });
  }

  const path =
    result === 'ok' ? '/newsletter/disiscrizione' : '/newsletter/disiscrizione-errore';
  return Response.redirect(new URL(path, url).toString(), 303);
};