/**
 * Request 1.0.2
 * @Class Request
 * @description luch-request 1.0.2 http请求插件
 * @Author lu-ch
 * @Date 2019-10-14
 * @Email webwork.s@qq.com
 * http://ext.dcloud.net.cn/plugin?id=392
 */
export default class Request {
  config = {
    baseUrl: '',
    header: {
      'content-type': 'application/json;charset=UTF-8'
    },
    method: 'GET',
    dataType: 'json',
    responseType: 'text'
  }

  static posUrl (url) { /* 判断url是否为绝对路径 */
    return /(http|https):\/\/([\w.]+\/?)\S*/.test(url)
  }

  static addQueryString (params) {
    let paramsData = ''
    Object.keys(params).forEach(function (key) {
      paramsData += key + '=' + params[key] + '&'
    })
    return paramsData.substring(0, paramsData.length - 1)
  }

  /**
   * @property {Function} request 请求拦截器
   * @property {Function} response 响应拦截器
   * @type {{request: Request.interceptor.request, response: Request.interceptor.response}}
   */
  interceptor = {
    /**
     * @param {Request~requestCallback} cb - 请求之前拦截,接收一个函数（config, cancel）=> {return config}。第一个参数为全局config,第二个参数为函数，调用则取消本次请求。
     */
    request: (cb) => {
      if (cb) {
        this.requestBeforeFun = cb
      }
    },
    /**
     * @param {Request~responseCallback} cb 响应拦截器，对响应数据做点什么
     * @param {Request~responseErrCallback} ecb 响应拦截器，对响应错误做点什么
     */
    response: (cb, ecb) => {
      if (cb && ecb) {
        this.requestComFun = cb
        this.requestComFail = ecb
      }
    }
  }

  requestBeforeFun (config) {
    return config
  }

  requestComFun (response) {
    return response
  }

  requestComFail (response) {
    return response
  }

  /**
   * 自定义验证器，如果返回true 则进入响应拦截器的响应成功函数(resolve)，否则进入响应拦截器的响应错误函数(reject)
   * @param { Number } statusCode - 请求响应体statusCode（只读）
   * @return { Boolean } 如果为true,则 resolve, 否则 reject
   */
  validateStatus (statusCode) {
    return statusCode === 200
  }

  /**
   * @Function
   * @param {Request~setConfigCallback} f - 设置全局默认配置
   */
  setConfig (f) {
    this.config = f(this.config)
  }

  /**
   * @Function
   * @param {Object} options - 请求配置项
   * @prop {String} options.url - 请求路径
   * @prop {Object} options.data - 请求参数
   * @prop {Object} [options.responseType = config.responseType] [text|arraybuffer] - 响应的数据类型
   * @prop {Object} [options.dataType = config.dataType] - 如果设为 json，会尝试对返回的数据做一次 JSON.parse
   * @prop {Object} [options.header = config.header] - 请求header
   * @prop {Object} [options.method = config.method] - 请求方法
   * @returns {Promise<unknown>}
   */
  async request (options = {}) {
    options.baseUrl = this.config.baseUrl
    options.dataType = options.dataType || this.config.dataType
    options.responseType = options.responseType || this.config.responseType
    options.url = options.url || ''
    options.data = options.data || {}
    options.params = options.params || {}
    options.header = options.header || this.config.header
    options.method = options.method || this.config.method
    return new Promise((resolve, reject) => {
      let next = true

      let handleRe = {}
      options.complete = (response) => {
        response.config = handleRe
        if (this.validateStatus(response.statusCode)) { // 成功
          response = this.requestComFun(response)
          resolve(response)
        } else {
          response = this.requestComFail(response)
          reject(response)
        }
      }
      const cancel = (t = 'handle cancel', config = options) => {
        const err = {
          errMsg: t,
          config: config
        }
        reject(err)
        next = false
      }

      handleRe = { ...this.requestBeforeFun(options, cancel) }
      const _config = { ...handleRe }
      if (!next) return

      let mergeUrl = Request.posUrl(options.url) ? options.url : (options.baseUrl + options.url)
      if (JSON.stringify(options.params) !== '{}') {
        const paramsH = Request.addQueryString(options.params)
        mergeUrl += mergeUrl.indexOf('?') === -1 ? `?${paramsH}` : `&${paramsH}`
      }
      _config.url = mergeUrl
      uni.request(_config)
    })
  }

  get (url, options = {}) {
    return this.request({
      url,
      method: 'GET',
      ...options
    })
  }

  post (url, data, options = {}) {
    return this.request({
      url,
      data,
      method: 'POST',
      ...options
    })
  }

  // #ifndef MP-ALIPAY
  put (url, data, options = {}) {
    return this.request({
      url,
      data,
      method: 'PUT',
      ...options
    })
  }

  // #endif

  // #ifdef APP-PLUS || H5 || MP-WEIXIN || MP-BAIDU
  delete (url, data, options = {}) {
    return this.request({
      url,
      data,
      method: 'DELETE',
      ...options
    })
  }

  // #endif

  // #ifdef APP-PLUS || H5 || MP-WEIXIN
  connect (url, data, options = {}) {
    return this.request({
      url,
      data,
      method: 'CONNECT',
      ...options
    })
  }

  // #endif

  // #ifdef APP-PLUS || H5 || MP-WEIXIN || MP-BAIDU
  head (url, data, options = {}) {
    return this.request({
      url,
      data,
      method: 'HEAD',
      ...options
    })
  }

  // #endif

  // #ifdef APP-PLUS || H5 || MP-WEIXIN || MP-BAIDU
  options (url, data, options = {}) {
    return this.request({
      url,
      data,
      method: 'OPTIONS',
      ...options
    })
  }

  // #endif

  // #ifdef APP-PLUS || H5 || MP-WEIXIN
  trace (url, data, options = {}) {
    return this.request({
      url,
      data,
      method: 'TRACE',
      ...options
    })
  }

  // #endif

  upload (url, {
    // #ifdef APP-PLUS
    files,
    // #endif
    // #ifdef MP-ALIPAY
    fileType,
    // #endif
    filePath,
    name,
    header,
    formData
  }) {
    return new Promise((resolve, reject) => {
      let next = true
      let handleRe = {}
      const pubConfig = {
        baseUrl: this.config.baseUrl,
        url,
        // #ifdef APP-PLUS
        files,
        // #endif
        // #ifdef MP-ALIPAY
        fileType,
        // #endif
        filePath,
        method: 'UPLOAD',
        name,
        header: header || this.config.header,
        formData,
        complete: (response) => {
          response.config = handleRe
          if (response.statusCode === 200) { // 成功
            response = this.requestComFun(response)
            resolve(response)
          } else {
            response = this.requestComFail(response)
            reject(response)
          }
        }
      }
      const cancel = (t = 'handle cancel', config = pubConfig) => {
        const err = {
          errMsg: t,
          config: config
        }
        reject(err)
        next = false
      }

      handleRe = { ...this.requestBeforeFun(pubConfig, cancel) }
      const _config = { ...handleRe }
      if (!next) return
      _config.url = Request.posUrl(url) ? url : (this.config.baseUrl + url)
      uni.uploadFile(_config)
    })
  }
}

/**
 * setConfig回调
 * @return {Object} - 返回操作后的config
 * @callback Request~setConfigCallback
 * @param {Object} config - 全局默认config
 */
/**
 * 请求拦截器回调
 * @return {Object} - 返回操作后的config
 * @callback Request~requestCallback
 * @param {Object} config - 全局config
 * @param {Function} [cancel] - 取消请求钩子，调用会取消本次请求
 */
/**
 * 响应拦截器回调
 * @return {Object} - 返回操作后的response
 * @callback Request~responseCallback
 * @param {Object} response - 请求结果 response
 */
/**
 * 响应错误拦截器回调
 * @return {Object} - 返回操作后的response
 * @callback Request~responseErrCallback
 * @param {Object} response - 请求结果 response
 */