// utils/mail.ts – simple wrapper around nodemailer
import nodemailer from 'nodemailer';
import { createAdminClient } from '@/lib/supabase/admin';

/**
 * Send an email using database-configured SMTP settings (or environment variable fallback).
 * If SMTP is not configured, logs a warning and gracefully skips sending instead of throwing.
 * @param to Recipient address
 * @param subject Subject line
 * @param text Plain‑text body
 * @param html Optional HTML body
 */
export async function sendMail({
  to,
  subject,
  text,
  html,
  attachments,
}: {
  to: string;
  subject: string;
  text: string;
  html?: string;
  attachments?: {
    filename: string;
    content: Buffer | string;
    contentType?: string;
  }[];
}) {
  try {
    // Query custom SMTP settings from database
    const supabase = createAdminClient();
    const { data: dbSettings } = await supabase
      .from('settings')
      .select('*')
      .eq('id', 'smtp')
      .maybeSingle();

    // Resolve config from DB or environment variables
    const host = dbSettings?.host || process.env.SMTP_HOST;
    const port = dbSettings?.port
      ? Number(dbSettings.port)
      : process.env.SMTP_PORT
      ? Number(process.env.SMTP_PORT)
      : 587;
    const secure = dbSettings
      ? !!dbSettings.secure
      : process.env.SMTP_SECURE === 'true' || process.env.SMTP_SECURE === '1';
    const user = dbSettings?.user || process.env.SMTP_USER;
    const pass = dbSettings?.pass || process.env.SMTP_PASS;

    if (!host || !user) {
      console.warn(
        `SMTP is not configured (missing host/user). E-Mail to "${to}" skipped.`
      );
      return { messageId: 'skipped-no-smtp-config', skipped: true };
    }

    // Create transporter dynamically on send request
    const transporter = nodemailer.createTransport({
      host,
      port,
      secure,
      auth: {
        user,
        pass: pass || '',
      },
      tls: {
        rejectUnauthorized: false,
      },
    });

    const fromAddress = process.env.SMTP_FROM || user;

    const info = await transporter.sendMail({
      from: fromAddress,
      to,
      subject,
      text,
      html,
      attachments,
    });

    return info;
  } catch (err: any) {
    console.error(`Failed to send email to "${to}":`, err.message || err);
    return { messageId: 'failed-smtp-error', error: err.message || err };
  }
}