export const prerender = false;

import type { APIRoute } from 'astro';
import nodemailer from 'nodemailer';
import { getAccount } from '../../../lib/mail-accounts';

export const POST: APIRoute = async ({ request }) => {
  const ct = request.headers.get('content-type') || '';

  let accountId: string | null = null;
  let to: string | null = null;
  let cc: string | null = null;
  let subject: string | null = null;
  let text: string | null = null;
  let html: string | null = null;
  let replyToMessageId: string | null = null;
  let attachments: { filename: string; content: Buffer; contentType: string }[] = [];

  if (ct.includes('multipart/form-data')) {
    const fd = await request.formData();
    accountId = fd.get('account') as string;
    to = fd.get('to') as string;
    cc = fd.get('cc') as string;
    subject = fd.get('subject') as string;
    text = fd.get('text') as string;
    html = fd.get('html') as string;
    replyToMessageId = fd.get('replyToMessageId') as string;
    for (const file of fd.getAll('attachments')) {
      if (file instanceof File) {
        attachments.push({
          filename: file.name,
          content: Buffer.from(await file.arrayBuffer()),
          contentType: file.type || 'application/octet-stream',
        });
      }
    }
  } else {
    const body = await request.json().catch(() => null);
    if (!body) return json({ error: 'Bad request' }, 400);
    ({ account: accountId, to, cc, subject, text, html, replyToMessageId } = body);
  }

  const acct = accountId ? getAccount(accountId) : undefined;
  if (!acct) return json({ error: 'Unknown account' }, 400);

  const transport = nodemailer.createTransport({
    host: acct.smtp.host, port: acct.smtp.port, secure: true,
    auth: { user: acct.smtp.user, pass: acct.smtp.password },
  });

  try {
    const info = await transport.sendMail({
      from: `${acct.name} <${acct.email}>`,
      to: to || undefined,
      cc: cc || undefined,
      subject: subject || undefined,
      text: text || undefined,
      html: html || undefined,
      attachments: attachments.length > 0 ? attachments : undefined,
      ...(replyToMessageId ? { inReplyTo: replyToMessageId, references: replyToMessageId } : {}),
    });
    return json({ ok: true, messageId: info.messageId });
  } catch (e: any) {
    return json({ error: e.message }, 500);
  }
};

function json(data: object, status = 200) {
  return new Response(JSON.stringify(data), { status, headers: { 'Content-Type': 'application/json' } });
}