// utils/http.js

/**
 * 环境配置
 */
const envConfig = {
  development: {
    baseUrl: 'https://feiniaotech-dev.sysuimars.cn/'
  },
  production: {
    baseUrl: 'https://feiniaotech-dev.sysuimars.cn/'
  }
}

const currentEnv = process.env.NODE_ENV || 'development'
const BASE_URL = envConfig[currentEnv].baseUrl

/**
 * 请求封装类
 */
class HttpRequest {
  constructor() {
    this.queue = {} // 请求队列
    this.interceptors = {
      beforeRequest: null,
      afterResponse: null
    }
  }

  /**
   * 获取基础配置
   */
  getDefaultConfig() {
    return {
      baseUrl: BASE_URL,
      url: '',
      header: {
        'Content-Type': 'application/json',
        'X-Requested-With': 'XMLHttpRequest'
      },
      timeout: 10000,
      data: {},
      method: 'GET'
    }
  }

  /**
   * 设置拦截器
   */
  setupInterceptors(instance) {
    this.interceptors.beforeRequest = (config) => {
      // 添加全局loading
      uni.showLoading({ 
        title: '加载中',
        mask: true
      })
      
      // 添加token
      const token = uni.getStorageSync('token')
      if (token) {
        config.header = config.header || {}
        config.header.Authorization = `Bearer ${token}`
      }
      
      // 记录请求开始时间（用于计算请求耗时）
      config.metadata = { startTime: new Date() }
      
      return config
    }

    this.interceptors.afterResponse = (response) => {
      uni.hideLoading()
      
      // 计算请求耗时
      const endTime = new Date()
      const duration = endTime - response.config.metadata.startTime
      console.log(`请求 ${response.config.url} 耗时: ${duration}ms`)
      
      const { data, statusCode } = response
      
      // 根据业务逻辑调整
      if (statusCode === 200) {
        return data
      } else {
        return this.handleError(response)
      }
    }
  }

  /**
   * 错误处理
   */
  handleError(error) {
    let errMsg = '请求失败'
    let needLogin = false
    
    if (error.statusCode) {
      switch (error.statusCode) {
        case 400:
          errMsg = error.data?.message || '请求参数错误'
          break
        case 401:
          errMsg = '未授权，请重新登录'
          needLogin = true
          break
        case 403:
          errMsg = '拒绝访问'
          break
        case 404:
          errMsg = '请求资源不存在'
          break
        case 500:
          errMsg = '服务器错误'
          break
        default:
          errMsg = `请求错误：${error.statusCode}`
      }
    } else if (error.errMsg && error.errMsg.includes('timeout')) {
      errMsg = '网络请求超时'
    } else if (error.errMsg && error.errMsg.includes('network')) {
      errMsg = '网络连接失败，请检查网络'
    }
    
    // 显示错误提示
    uni.showToast({
      title: errMsg,
      icon: 'none',
      duration: 2000
    })
    
    // 需要登录的情况
    if (needLogin) {
      setTimeout(() => {
        uni.navigateTo({
          url: '/pages/login/login'
        })
      }, 1500)
    }
    
    return Promise.reject(error)
  }

  /**
   * 创建请求实例
   */
  create() {
    const instance = {
      request: (options) => {
        // 合并配置
        let config = { ...this.getDefaultConfig(), ...options }
        
        // 处理URL
        if (!config.url.startsWith('http') && !config.url.startsWith('https')) {
          config.url = config.baseUrl + config.url
        }
        
        // 应用请求拦截
        if (typeof this.interceptors.beforeRequest === 'function') {
          config = this.interceptors.beforeRequest(config) || config
        }
        
        return new Promise((resolve, reject) => {
          uni.request({
            ...config,
            success: (res) => {
              // 应用响应拦截
              try {
                const processed = typeof this.interceptors.afterResponse === 'function'
                  ? this.interceptors.afterResponse(res)
                  : res
                resolve(processed)
              } catch (err) {
                reject(this.handleError(err))
              }
            },
            fail: (err) => {
              reject(this.handleError(err))
            }
          })
        })
      },
      
      // 添加常用方法别名
      get: (url, params = {}, options = {}) => {
        return this.request({
          url,
          method: 'GET',
          data: params,
          ...options
        })
      },
      
      post: (url, data = {}, options = {}) => {
        return this.request({
          url,
          method: 'POST',
          data,
          ...options
        })
      },
      
      put: (url, data = {}, options = {}) => {
        return this.request({
          url,
          method: 'PUT',
          data,
          ...options
        })
      },
      
      delete: (url, data = {}, options = {}) => {
        return this.request({
          url,
          method: 'DELETE',
          data,
          ...options
        })
      },
      
      upload: (url, filePath, name = 'file', formData = {}, options = {}) => {
        return new Promise((resolve, reject) => {
          const fullUrl = url.startsWith('http') ? url : BASE_URL + url
          const token = uni.getStorageSync('token')
          
          uni.uploadFile({
            url: fullUrl,
            filePath,
            name,
            formData,
            header: {
              'Authorization': token ? `Bearer ${token}` : '',
              ...(options.header || {})
            },
            success: (res) => {
              if (res.statusCode === 200) {
                try {
                  resolve(JSON.parse(res.data))
                } catch (e) {
                  resolve(res.data)
                }
              } else {
                reject(this.handleError(res))
              }
            },
            fail: (err) => {
              reject(this.handleError(err))
            },
            ...options
          })
        })
      }
    }
    
    // 初始化拦截器
    this.setupInterceptors(instance)
    
    // 绑定this
    instance.request = instance.request.bind(this)
    instance.get = instance.get.bind(this)
    instance.post = instance.post.bind(this)
    instance.put = instance.put.bind(this)
    instance.delete = instance.delete.bind(this)
    instance.upload = instance.upload.bind(this)
    
    return instance
  }
}

// 创建单例
const http = new HttpRequest().create()

export default http