const luchRequest = require('luch-request')
const Request = luchRequest.default || luchRequest
const { generateSignatureHeaders } = require('./signature')
const store = require('../store/index')

const BASE_URL = 'http://192.168.110.64:8084/api'

const http = new Request({
  baseURL: BASE_URL,
  timeout: 15000,
  header: {
    'Content-Type': 'application/json'
  }
})

// 请求拦截器
http.interceptors.request.use(
  (config) => {
    // 注入 JWT token
    const token = store.getToken()
    if (token) {
      config.header = config.header || {}
      config.header.Authorization = 'Bearer ' + token
    }

    // 注入签名头
    const method = (config.method || 'GET').toUpperCase()
    const url = config.url || ''
    const body = config.data

    const signatureHeaders = generateSignatureHeaders(method, url, body)
    config.header = config.header || {}
    Object.assign(config.header, signatureHeaders)

    return config
  },
  (error) => Promise.reject(error)
)

// 响应拦截器
http.interceptors.response.use(
  (response) => {
    // 直接返回 data，统一解包
    if (response.statusCode === 200) {
      return response.data
    }
    // 非200状态码：构造错误对象，确保 catch 块能正确读取 message
    const error = new Error(response.data?.message || '请求失败')
    error.statusCode = response.statusCode
    error.data = response.data
    return Promise.reject(error)
  },
  (error) => {
    // 401 处理：清除登录态，跳转登录页
    if (error.statusCode === 401) {
      store.clearLogin()
      const pages = getCurrentPages()
      const currentPage = pages[pages.length - 1]
      if (currentPage && currentPage.route !== 'pages/login/login') {
        uni.reLaunch({ url: '/pages/login/login' })
      }
    }
    return Promise.reject(error)
  }
)

/**
 * 将 coverImage 字段值解析为完整图片 URL
 * - /api/files/{id}/preview → 拼接 baseURL 后返回
 * - 纯数字 → 构造 /files/{id}/preview 后拼接 baseURL
 * - 其他 → 原样返回
 */
function resolveCoverUrl(coverImage) {
  if (!coverImage) return ''
  // 新格式：/api/files/{id}/preview
  if (/^\/api\/files\/\d+\/preview$/.test(coverImage)) {
    return BASE_URL + coverImage.substring(4) // 去掉 /api
  }
  // 旧格式：纯数字 ID
  if (/^\d+$/.test(coverImage)) {
    return BASE_URL + '/files/' + coverImage + '/preview'
  }
  return coverImage
}

module.exports = http
module.exports.resolveCoverUrl = resolveCoverUrl