// 统一请求封装
// 开发环境经 Vite 代理转发到后端(见 vite.config.js)，生产可用 VITE_API_BASE 指定后端地址
const BASE = import.meta.env.VITE_API_BASE || ''

function buildQuery(params) {
  const q = new URLSearchParams()
  Object.entries(params || {}).forEach(([k, v]) => {
    if (v !== undefined && v !== null && v !== '') q.append(k, v)
  })
  const s = q.toString()
  return s ? '?' + s : ''
}

export async function request(path, { method = 'GET', body, params } = {}) {
  const url = BASE + path + buildQuery(params)
  const options = { method, headers: {} }
  if (body !== undefined) {
    options.headers['Content-Type'] = 'application/json'
    options.body = JSON.stringify(body)
  }
  let json
  try {
    const res = await fetch(url, options)
    json = await res.json()
  } catch (e) {
    throw new Error('网络异常，请稍后重试')
  }
  if (!json || json.code !== 0) {
    throw new Error((json && json.msg) || '请求失败')
  }
  return json.data
}