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import { Net } from '.'
import * as Utils from './utils'
type ReqConfig = {
  uri?: string
  method?: string
  timeout?: number
  body?: any
  headers?: any
}
type HttpConfig = {
  timeout?: number
  headers?: any
}
export class BrowserNet {
  static _xmlRequest(reqConfig: ReqConfig, callback: Function) {
    const { uri, method, timeout, body } = reqConfig
    let hasCallbacked = false
    var xhr = new XMLHttpRequest()
    xhr.open(method, uri, true)
    for (var id in reqConfig.headers) {
      xhr.setRequestHeader(id, reqConfig.headers[id])
    }
    xhr.onload = function () {
      if (hasCallbacked) return
      hasCallbacked = true
      if (xhr.status >= 200 && xhr.status <= 207) {
        callback(null, xhr.responseText)
      } else {
        callback('EC_REQ_FAILED')
      }
    }

    xhr.ontimeout = function () {
      if (hasCallbacked) return
      hasCallbacked = true
      callback('EC_REQ_TIMEOUT')
    }
    xhr.onerror = function () {
      if (hasCallbacked) return
      hasCallbacked = true
      callback('EC_REQ_FAILED')
    }
    xhr.timeout = timeout
    if (method == 'POST') {
      xhr.send(body)
    } else {
      xhr.send()
    }
  }
  static httpGet(url: string, params: any, cb?: Function, config?: any) {
    let str = ''
    let cnt = 0
    for (var id in params) {
      if (cnt != 0) str += '&'
      str += id + '=' + params[id]
      cnt++
    }
    if (str) {
      url += '?' + str
    }

    config = config || {}
    let headers = config.headers || {}
    let timeout = config.timeout || Net.timeout
    let reqData: ReqConfig = {
      uri: url,
      method: 'GET',
      timeout,
      headers,
    }
    const handlerCallback = (resolve: Function, reject: Function) => {
      this._xmlRequest(reqData, (err: any, body: any) => {
        if (err) {
          reject(err)
          return
        }
        if (typeof body == 'string') {
          try {
            body = JSON.parse(body)
          } catch (e) {}
        }
        resolve(body)
      })
    }

    if (typeof cb === 'function') {
      handlerCallback(
        (result: any) => Utils.invokeCallback(cb, null, result),
        (err: any) => Utils.invokeCallback(cb, err)
      )
      return
    }

    return new Promise((resolve, reject) => {
      handlerCallback(resolve, reject)
    })
  }
 
  static async httpPost(url: string, params: any, cb?: Function, config?: HttpConfig) {
    let postData: any

    config = config || {}

    let headers = config.headers || {}
    let timeout = config.timeout || Net.timeout
    headers['content-type'] = headers['content-type'] || 'application/json'
    if (headers['content-type'] == 'application/x-www-form-urlencoded') {
      let arr = []
      for (var id in params) {
        arr.push(`${id}=${params[id]}`)
      }
      postData = arr.join('&')
    } else if (headers['content-type'] == 'text/plain') {
      postData = params
    } else {
      postData = JSON.stringify(params)
    }

    if (headers['content-encoding'] == 'gzip') {
      postData = await Utils.gzip(Buffer.from(postData))
    }

    const reqData = {
      uri: url,
      method: 'POST',
      body: postData,
      headers: headers,
      timeout: timeout,
    }
    const handlerCallback = (resolve: Function, reject: Function) => {
      this._xmlRequest(reqData, (err: any, body: any) => {
        if (err) {
          reject(err)
          return
        }
        if (typeof body == 'string') {
          try {
            body = JSON.parse(body)
          } catch (e) {}
        }
        resolve(body)
      })
    }

    if (typeof cb === 'function') {
      handlerCallback(
        (result: any) => Utils.invokeCallback(cb, null, result),
        (err: any) => Utils.invokeCallback(cb, err)
      )
      return
    }

    return new Promise((resolve, reject) => {
      handlerCallback(resolve, reject)
    })
  }
}