export type User = {
  id: string
  username: string
}

async function request<T>(path: string, options: RequestInit = {}): Promise<T> {
  const response = await fetch(path, {
    ...options,
    credentials: 'include',
    headers: {
      'Content-Type': 'application/json',
      ...options.headers,
    },
  })
  if (!response.ok) {
    const body = await response.json().catch(() => ({ detail: response.statusText }))
    throw new Error(body.detail ?? `Request failed: ${response.status}`)
  }
  if (response.status === 204) {
    return undefined as T
  }
  return response.json() as Promise<T>
}

export function register(username: string, password: string): Promise<User> {
  return request<User>('/auth/register', {
    method: 'POST',
    body: JSON.stringify({ username, password }),
  })
}

export function login(username: string, password: string): Promise<User> {
  return request<User>('/auth/login', {
    method: 'POST',
    body: JSON.stringify({ username, password }),
  })
}

export function logout(): Promise<void> {
  return request<void>('/auth/logout', { method: 'POST' })
}

export function me(): Promise<User> {
  return request<User>('/auth/me')
}