import { fetchApi } from '@/api/client'

export type Household = { id: number; name: string; slug: string }

function isHousehold(value: unknown): value is Household {
  return (
    typeof value === 'object' && value !== null &&
    typeof (value as { id: unknown }).id === 'number' &&
    typeof (value as { name: unknown }).name === 'string' &&
    typeof (value as { slug: unknown }).slug === 'string'
  )
}

async function safeJson<T>(resp: Response): Promise<T | null> {
  try {
    const d = await resp.json()
    return d as T
  } catch (_e) {
    return null
  }
}

export async function acceptInvitation(token: string): Promise<Household> {
  const resp = await fetchApi('/api/v1/invitations/accept', {
    method: 'POST',
    headers: { 'Content-Type': 'application/json' },
    body: JSON.stringify({ token }),
  })
  if (!resp.ok) throw new Error(`${resp.status} ${resp.statusText || 'HTTP error'}`)
  const data = await safeJson<{ household?: unknown }>(resp)
  let h: unknown
  if (data && typeof data === 'object' && 'household' in data) {
    h = (data as { household?: unknown }).household
  } else {
    h = undefined
  }
  if (!isHousehold(h)) {
    throw new Error('Invalid invitation accept response')
  }
  return { id: h.id, name: h.name, slug: h.slug }
}

export async function sendInvitation(email: string): Promise<void> {
  const resp = await fetchApi('/api/v1/invitations', {
    method: 'POST',
    headers: { 'Content-Type': 'application/json' },
    body: JSON.stringify({ email }),
  })
  if (!resp.ok && resp.status !== 204) throw new Error(`${resp.status} ${resp.statusText || 'HTTP error'}`)
}