import { BookingDocument } from '../db/booking'
import { getBaseURL } from '../helpers/url'

const SENDGRID_API_KEY = process.env.SENDGRID_API_KEY
const ADMIN_EMAIL = process.env.ADMIN_EMAIL
const FROM_EMAIL = process.env.FROM_EMAIL
const SENDGRID_URL = 'https://api.sendgrid.com/v3/mail/send'

if (!SENDGRID_API_KEY) {
  throw new Error('NO SENDGRID_API_KEY set!')
}

if (!ADMIN_EMAIL) {
  throw new Error('No ADMIN_EMAIL set!')
}

if (!FROM_EMAIL) {
  throw new Error('No FROM_EMAIL set!')
}

async function sendMail(data: object) {
  const fetchOptions = {
    method: 'POST',
    headers: {
      'Content-Type': 'application/json',
      Authorization: `Bearer ${SENDGRID_API_KEY}`,
    },
    body: JSON.stringify(data),
  }
  const response = await fetch(SENDGRID_URL, fetchOptions)

  if (!response.ok) {
    throw new Error(`Unable to send mail`)
  }
}

function getReceivedBookingAdminText(booking: { uuid: string }) {
  return `Hallo lieber Admin,

es ging folgende Buchung ein: ${getBaseURL()}/booking/${booking.uuid}

MfG`
}

export async function sendReceivedBookingAdminMail(booking: BookingDocument) {
  const data = {
    personalizations: [
      {
        to: [{ email: ADMIN_EMAIL }],
      },
    ],
    from: { email: FROM_EMAIL, name: "Pfadi-Bussle Wart" },
    subject: `Buchung für ${booking.days} eingegangen!`,
    content: [{ type: 'text/plain', value: getReceivedBookingAdminText(booking) }],
  }

  try {
    await sendMail(data)
  } catch (error) {
    console.error(`Failed in sendReceivedBookingMail for ${booking.uuid}`)
  }
}

function getReceivedBookingBookerText(booking: BookingDocument) {
  return `Hallo liebe/r ${booking.booker.name},

Vielen Dank für Deine Buchung. Nach Prüfung bestätigen wir die Buchung bald per E-Mail!

Du kannst sie jederzeit unter

${getBaseURL()}/booking/${booking.uuid}

einsehen und auch stornieren.

Viele Grüße

Thomas Ruoff
Pfadi Bussle Wart

Tel. 0151/212 253 62
`
}

export async function sendReceivedBookingBookerMail(booking: BookingDocument) {
  const data = {
    personalizations: [
      {
        to: [{ email: booking.booker.email, name: booking.booker.name }],
      },
    ],
    from: { email: FROM_EMAIL, name: "Pfadi-Bussle Wart" },
    subject: `Deine Buchung ist eingegangen!`,
    content: [{ type: 'text/plain', value: getReceivedBookingBookerText(booking) }],
  }

  try {
    await sendMail(data)
  } catch (error) {
    console.error(`Failed in sendReceivedBookingMail for ${booking.uuid}`)
  }
}