import type { SendEmailInput, SendEmailResult } from '@admin/actions/email/types'
import { getFromAddress } from '@admin/actions/resend/get-from-address'
import { getResendClient } from '@admin/actions/resend/get-resend-client'
import { htmlToText } from '@admin/actions/resend/html-to-text'

const NOT_CONFIGURED_REASON =
  'Resend email delivery requires BETTERSTART_RESEND_API_KEY and BETTERSTART_EMAIL_FROM.'

export async function sendEmail(input: SendEmailInput): Promise<SendEmailResult> {
  const client = getResendClient()
  const from = getFromAddress()

  if (!client || !from) {
    return {
      delivered: false,
      reason: NOT_CONFIGURED_REASON
    }
  }

  try {
    const result = await client.emails.send({
      from,
      to: input.to,
      subject: input.subject,
      html: input.html,
      text: htmlToText(input.html)
    })

    if (result.error) {
      return {
        delivered: false,
        reason: result.error.message
      }
    }

    return { delivered: true }
  } catch (error) {
    return {
      delivered: false,
      reason: error instanceof Error ? error.message : 'Resend email delivery failed.'
    }
  }
}