/**
 * Typed API client for the FamilySync lists API.
 *
 * credentials: 'include' is required so the OIDC session cookie is sent with
 * every request (same pattern as client.ts).
 *
 * This file provides only the functions needed in Plan 04-01 (ListsIndex empty
 * state). Plans 04-02 and 04-03 expand it with createList, deleteList, item CRUD.
 */

const BASE = '/api'

async function apiFetch(path: string, init?: RequestInit): Promise<Response> {
  const res = await fetch(`${BASE}${path}`, {
    credentials: 'include',
    ...init,
  })
  if (!res.ok) throw new Error(`${init?.method ?? 'GET'} ${path} failed: ${res.status}`)
  return res
}

// ── Types ──────────────────────────────────────────────────────────────────

export interface List {
  id: number
  name: string
  isShared: boolean
  ownerId: number
}

export interface ListItem {
  id: number
  listId: number
  text: string
  checked: boolean
  rank: string
}

export interface ListsResponse {
  lists: List[]
}

// ── Functions ──────────────────────────────────────────────────────────────

export async function fetchLists(): Promise<ListsResponse> {
  return apiFetch('/lists').then((r) => r.json() as Promise<ListsResponse>)
}