// API 调用封装: 自动带 JWT、401 自动清 token、抛统一错误
const TOKEN_KEY = 'iboard_token'
const REMEMBER_KEY = 'iboard_remember'

export function getToken() {
  return localStorage.getItem(TOKEN_KEY) || ''
}

export function setToken(token) {
  if (token) localStorage.setItem(TOKEN_KEY, token)
  else localStorage.removeItem(TOKEN_KEY)
}

export function getRememberFlag() {
  return localStorage.getItem(REMEMBER_KEY) === '1'
}

export function setRememberFlag(v) {
  if (v) localStorage.setItem(REMEMBER_KEY, '1')
  else localStorage.removeItem(REMEMBER_KEY)
}

export async function api(path, { method = 'GET', body, headers = {} } = {}) {
  const token = getToken()
  const res = await fetch('/api' + path, {
    method,
    headers: {
      'Content-Type': 'application/json',
      ...(token ? { Authorization: 'Bearer ' + token } : {}),
      ...headers,
    },
    body: body ? JSON.stringify(body) : undefined,
  })
  if (res.status === 401) {
    setToken('')
    const data = await res.json().catch(() => ({}))
    if (!path.startsWith('/auth/')) window.location.assign('/login')
    throw new Error(data.error || '未登录')
  }
  const data = await res.json().catch(() => ({}))
  if (!res.ok) throw new Error(data.error || '请求失败 (' + res.status + ')')
  return data
}