import { defineEventHandler, getCookie, getRequestHeaders, getRequestURL, readBody } from 'h3'

export default defineEventHandler(async (event) => {
  const { method } = event.node.req as any
  const headers = getRequestHeaders(event)
  const url = getRequestURL(event)
  const config = useRuntimeConfig()

  const apiOrigin = config.public.API_ORIGIN
  const apiVclaim = config.public.VCLAIM
  const apiVclaimSwagger = config.public.VCLAIM_SWAGGER
  const pathname = url.pathname.replace(/^\/api/, '')
  const isVclaim = pathname.includes('/vclaim')

  let targetUrl = apiOrigin + pathname + (url.search || '')
  if (pathname.includes('/vclaim')) {
    targetUrl = apiVclaim + pathname.replace('/vclaim', '') + (url.search || '')
  }
  if (pathname.includes('/vclaim-swagger')) {
    targetUrl = apiVclaimSwagger + pathname.replace('/vclaim-swagger', '') + (url.search || '')
  }

  const verificationId = headers['verification-id'] as string | undefined
  let bearer = ''
  if (verificationId) {
    bearer = getCookie(event, `Verification-${verificationId}`) || ''
    if (!bearer) bearer = getCookie(event, 'authentication') || ''
  } else {
    bearer = getCookie(event, 'authentication') || ''
  }

  const forwardHeaders = new Headers()
  if (!isVclaim) {
    if (headers['content-type']) forwardHeaders.set('Content-Type', headers['content-type'])
    forwardHeaders.set('Authorization', `Bearer ${bearer}`)
  }

  let body: any
  if (['POST', 'PATCH', 'PUT', 'DELETE'].includes(method)) {
    if (headers['content-type']?.includes('multipart/form-data')) {
      body = await readBody(event)
    } else {
      body = await readBody(event)
      forwardHeaders.set('Content-Type', 'application/json')
      body = JSON.stringify(body)
    }
  }

  const res = await fetch(targetUrl, {
    method,
    headers: forwardHeaders,
    body,
  })

  if (isVclaim) {
    const resClone = res.clone()
    const responseBody = await resClone.json()
    return {
      status: resClone.status,
      headers: resClone.headers,
      ...responseBody,
    }
  }

  return res
})