import type { BindPayload } from './types'

function joinUrl(base: string, path: string): string {
  const b = base.replace(/\/$/, '')
  const p = path.startsWith('/') ? path : `/${path}`
  return `${b}${p}`
}

export type ApiFetchInit = RequestInit & { pbToken?: string | null }

export async function apiFetch(
  bind: BindPayload | null,
  path: string,
  init?: ApiFetchInit,
): Promise<Response> {
  if (!bind) {
    return Promise.reject(new Error('尚未绑定 PC（请先在「配对」扫码）'))
  }
  const { pbToken, ...rest } = init ?? {}
  const headers = new Headers(rest.headers)
  if (bind.token?.trim()) {
    headers.set('Authorization', `Bearer ${bind.token.trim()}`)
  }
  if (pbToken?.trim()) {
    headers.set('X-PB-Token', pbToken.trim())
  }
  return fetch(joinUrl(bind.baseUrl, path), { ...rest, headers })
}

export async function apiJson<T>(bind: BindPayload | null, path: string, init?: ApiFetchInit): Promise<T> {
  const res = await apiFetch(bind, path, init)
  if (!res.ok) {
    const t = await res.text()
    throw new Error(t || `HTTP ${res.status}`)
  }
  return res.json() as Promise<T>
}