import nodemailer from 'nodemailer'
import { SMTP_HOST, SMTP_PORT, SMTP_USER, SMTP_PASSWORD, SMTP_FROM, MAILSHIP_NAME, BASE_URL } from './env.js'
import type { Subscription } from './alert.js'
import { render } from './templates.js'

const secure = Number(SMTP_PORT) === 465

const transporter = nodemailer.createTransport({
  host: SMTP_HOST,
  port: Number(SMTP_PORT),
  secure,
  requireTLS: !secure,
  auth: {
    user: SMTP_USER,
    pass: SMTP_PASSWORD,
  },
})

export const sendConfirm = (sub: Subscription) => {
  const href = `${BASE_URL}/confirm?token=${sub.key}`

  return transporter
    .sendMail({
      from: SMTP_FROM,
      to: sub.email,
      subject: 'Confirm your email digest',
      html: `
      <h3>Welcome to ${MAILSHIP_NAME}!</h3>
      <p>Please confirm that you would like to receive ${sub.frequency} digests by clicking the link below:</p>
      <p><a href="${href}">Confirm Digest</a></p>
    `,
      text: `Please confirm that you would like to receive ${sub.frequency} digests by visiting: ${href}`,
    })
    .catch(error => {
      console.error('mailer: confirmation email failed', {
        to: sub.email,
        smtp: { host: SMTP_HOST, port: SMTP_PORT },
        error: error?.message || error,
      })
      throw error
    })
}

export const sendDigest = async (sub: Subscription, variables: Record<string, any>) => {
  return transporter
    .sendMail({
      from: SMTP_FROM,
      to: sub.email,
      subject: 'New activity',
      html: await render('emails/digest.mjml', {
        ...variables,
        name: sub.email.split('@')[0],
        unsubscribeUrl: `${BASE_URL}/unsubscribe?token=${sub.key}`,
      }),
    })
    .catch(error => {
      console.error('mailer: digest email failed', {
        to: sub.email,
        smtp: { host: SMTP_HOST, port: SMTP_PORT },
        error: error?.message || error,
      })
      throw error
    })
}