import { type Request, type ResponseToolkit } from '@hapi/hapi'

function calculateAge(day: string, month: string, year: string) {
  const dobDate = new Date(Number(day), Number(month) - 1, Number(year))

  const today = new Date()

  let age = today.getFullYear() - dobDate.getFullYear()
  const m = today.getMonth() - dobDate.getMonth()

  if (m < 0 || (m === 0 && today.getDate() < dobDate.getDate())) {
    age--
  }

  return age
}

export default [
  {
    method: 'POST',
    path: '/api/example/on-load-page',
    handler(
      request: Request<{ Payload: { meta: { referenceNumber: string } } }>,
      _h: ResponseToolkit
    ) {
      return {
        submissionEvent: 'GET',
        submissionReferenceNumber: request.payload.meta.referenceNumber
      }
    }
  },
  {
    method: 'POST',
    path: '/api/example/on-summary',
    handler(
      request: Request<{
        Payload: {
          data: {
            main: {
              applicantFirstName: string
              applicantLastName: string
              dateOfBirth: string
            }
          }
          meta: { event: string; referenceNumber: string }
        }
      }>,
      _h: ResponseToolkit
    ) {
      const [day, month, year] =
        request.payload.data.main.dateOfBirth.split('-')

      const age = calculateAge(day, month, year)

      return {
        calculatedAge: age,
        submissionEvent: 'POST',
        submissionReferenceNumber: request.payload.meta.referenceNumber // example of receiving a payload from DXT
      }
    }
  }
]