import { createError } from 'h3'
import { getRuntimeEnvValue } from './runtime-env'

/**
 * Resend가 서버 설정으로 사용 가능한지
 * @param {{ resendApiKey?: string, resendFromEmail?: string }} config - 런타임 설정
 * @returns {boolean}
 */
export const isResendConfigured = (config) => {
  const key = getRuntimeEnvValue('RESEND_API_KEY', 'resendApiKey', String(config?.resendApiKey || '')).trim()
  const from = getRuntimeEnvValue('RESEND_FROM_EMAIL', 'resendFromEmail', String(config?.resendFromEmail || '')).trim()
  return Boolean(key && from)
}

/**
 * Resend REST API로 이메일을 발송한다.
 * @param {{ apiKey: string, from: string, to: string, subject: string, html: string }} input - 발송 입력
 * @returns {Promise<void>}
 */
export const sendResendEmail = async (input) => {
  const res = await fetch('https://api.resend.com/emails', {
    method: 'POST',
    headers: {
      Authorization: `Bearer ${input.apiKey}`,
      'Content-Type': 'application/json'
    },
    body: JSON.stringify({
      from: input.from,
      to: [input.to],
      subject: input.subject,
      html: input.html
    })
  })

  if (!res.ok) {
    const detail = await res.text().catch(() => '')
    throw createError({
      statusCode: 502,
      message: '이메일 발송에 실패했습니다. Resend 발신 주소·도메인 설정을 확인해 주세요.',
      data: process.env.NODE_ENV === 'development' && detail ? { detail } : undefined
    })
  }
}