import http from 'luch-request'

// 创建实例
const httpInstance = http.create({
  baseURL: import.meta.env.VITE_API_BASE_URL || '/api',
  timeout: 10000,
  header: {
    'Content-Type': 'application/json;charset=UTF-8'
  }
})

// 请求拦截器
httpInstance.interceptors.request.use(
  (config) => {
    // 从本地存储获取 token
    const token = uni.getStorageSync('token')
    if (token) {
      config.header = {
        ...config.header,
        'Authorization': `Bearer ${token}`
      }
    }

    // 添加时间戳，防止缓存
    if (config.method === 'GET') {
      config.params = {
        ...config.params,
        _t: Date.now()
      }
    }

    // 显示加载提示
    if (config.loading !== false) {
      uni.showLoading({
        title: config.loadingText || '加载中...',
        mask: true
      })
    }

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

// 响应拦截器
httpInstance.interceptors.response.use(
  (response) => {
    // 隐藏加载提示
    if (response.config.loading !== false) {
      uni.hideLoading()
    }

    const { statusCode, data } = response

    // HTTP 状态码判断
    if (statusCode !== 200) {
      showError('网络请求失败')
      return Promise.reject(response)
    }

    // 业务状态码判断
    if (data.code !== undefined) {
      // 成功响应
      if (data.code === 0 || data.code === 200 || data.code === 1) {
        return data.data !== undefined ? data.data : data
      }

      // 业务错误处理
      if (data.code === 401) {
        // token 失效，跳转登录页
        uni.removeStorageSync('token')
        uni.removeStorageSync('userInfo')
        uni.showToast({
          title: '登录已过期，请重新登录',
          icon: 'none',
          duration: 2000
        })
        setTimeout(() => {
          uni.navigateTo({
            url: '/pages/login/index'
          })
        }, 2000)
        return Promise.reject(data)
      }

      // 其他业务错误
      showError(data.message || data.msg || '请求失败')
      return Promise.reject(data)
    }

    return data
  },
  (error) => {
    // 隐藏加载提示
    if (error.config && error.config.loading !== false) {
      uni.hideLoading()
    }

    let errorMessage = '网络请求失败'

    if (error.response) {
      const { statusCode, data } = error.response
      switch (statusCode) {
        case 400:
          errorMessage = data?.message || '请求参数错误'
          break
        case 401:
          errorMessage = '登录已过期，请重新登录'
          uni.removeStorageSync('token')
          uni.removeStorageSync('userInfo')
          setTimeout(() => {
            uni.navigateTo({
              url: '/pages/login/index'
            })
          }, 2000)
          break
        case 403:
          errorMessage = '没有权限访问'
          break
        case 404:
          errorMessage = '请求的资源不存在'
          break
        case 500:
          errorMessage = '服务器内部错误'
          break
        case 502:
          errorMessage = '网关错误'
          break
        case 503:
          errorMessage = '服务不可用'
          break
        case 504:
          errorMessage = '网关超时'
          break
        default:
          errorMessage = data?.message || `请求失败 (${statusCode})`
      }
    } else if (error.errMsg) {
      // 网络错误
      if (error.errMsg.includes('timeout')) {
        errorMessage = '请求超时，请检查网络连接'
      } else if (error.errMsg.includes('network')) {
        errorMessage = '网络连接失败，请检查网络'
      }
    }

    showError(errorMessage)
    return Promise.reject(error)
  }
)

// 显示错误提示
function showError(message) {
  uni.showToast({
    title: message,
    icon: 'none',
    duration: 3000
  })
}

// 封装常用请求方法
export default {
  // GET 请求
  get(url, params = {}, config = {}) {
    return httpInstance.get(url, {
      params,
      ...config
    })
  },

  // POST 请求
  post(url, data = {}, config = {}) {
    return httpInstance.post(url, data, config)
  },

  // PUT 请求
  put(url, data = {}, config = {}) {
    return httpInstance.put(url, data, config)
  },

  // DELETE 请求
  delete(url, data = {}, config = {}) {
    return httpInstance.delete(url, {
      data,
      ...config
    })
  },

  // 文件上传
  upload(url, filePath, formData = {}, config = {}) {
    return httpInstance.upload(url, {
      filePath,
      formData,
      name: 'file',
      ...config
    })
  },

  // 文件下载
  download(url, config = {}) {
    return httpInstance.download(url, config)
  },

  // 原始实例，用于特殊场景
  instance: httpInstance
}