import { verifyRegistrationResponse, type RegistrationResponseJSON } from '@simplewebauthn/server'

import { requireAuth } from '../../../../utils/auth'
import { createUserPasskey, getUserById, listUserPasskeys } from '../../../../utils/user-repository'
import { buildPasskeyLabel, consumeRegistrationChallenge, getWebAuthnConfig } from '../../../../utils/webauthn'

export default defineEventHandler(async (event) => {
  const auth = await requireAuth(event)
  const body = await readBody<{
    response?: RegistrationResponseJSON
  }>(event)

  if (!body.response) {
    throw createError({
      statusCode: 400,
      statusMessage: 'Passkey registration response is required'
    })
  }

  const expectedChallenge = await consumeRegistrationChallenge(auth.user.id)

  if (!expectedChallenge) {
    throw createError({
      statusCode: 400,
      statusMessage: 'Passkey registration challenge expired. Try again.'
    })
  }

  const config = getWebAuthnConfig(event)
  const verification = await verifyRegistrationResponse({
    response: body.response,
    expectedChallenge,
    expectedOrigin: config.origin,
    expectedRPID: config.rpID
  })

  if (!verification.verified || !verification.registrationInfo) {
    throw createError({
      statusCode: 400,
      statusMessage: 'Passkey registration could not be verified'
    })
  }

  try {
    await createUserPasskey({
      userId: auth.user.id,
      credentialId: verification.registrationInfo.credential.id,
      publicKey: verification.registrationInfo.credential.publicKey,
      counter: verification.registrationInfo.credential.counter,
      deviceType: verification.registrationInfo.credentialDeviceType,
      backedUp: verification.registrationInfo.credentialBackedUp,
      transports: body.response.response.transports || [],
      label: buildPasskeyLabel()
    })
  } catch (error: any) {
    if (error?.code === '23505') {
      throw createError({
        statusCode: 409,
        statusMessage: 'This passkey is already registered'
      })
    }

    throw error
  }

  const updatedUser = await getUserById(auth.user.id)
  const passkeys = await listUserPasskeys(auth.user.id)

  return {
    ok: true,
    user: updatedUser,
    passkeys
  }
})