import { requestConfig } from  './common.js';
 
 export default class Request {
    //  构造方法
    constructor(config = {}, reqInterceptor = null, resInterceptor = null, successHandler, failHandler = null, completeHandler = null){
        // 基础属性
        this.baseUrl = config.baseUrl
        this.header = config.header || {
            "Content-Type":"application/x-www-form-urlencoded"
        }
        // 自定义响应处理器
        this.success = successHandler
        this.fail = failHandler
        this.complete = completeHandler
        //  自定义拦截器(请求、响应)
        this.requestInterceptor = reqInterceptor
        this.responseInterceptor = resInterceptor
    }
    // 请求type request/upload/download
    async request(options, successHandler = null, failHandler = null, completeHandler = null){
        const task = options.task || false
        const type = options.type || "request"
        // delete options.task
        let config = null
        try {
            config = await requestConfig(this, options, successHandler, failHandler, completeHandler)
        } catch (e) {
            // reject the error
            return Promise.reject(e)
        }
        if(!config || typeof config != 'object'){
            return Promise.reject({})
        }
        
        const _this = this
        if(task){
            config["success"] = (response) => {
                if (_this.responseInterceptor) {
                    _this.responseInterceptor(response, config)
                }
                _this.success && _this.success(response)
                successHandler && successHandler(response)
            }
            config["fail"] = (response) => {
                _this.fail && _this.fail(response)
                failHandler && failHandler(response)
            }
            config["complete"] = (response) => {
                _this.complete && _this.complete(response)
                completeHandler && completeHandler(response)
            }
            if (type === "request"){
                return uni.request(config)
            }else if(type === "upload"){
                return uni.uploadFile(config)
            }else{
                return uni.downloadFile(config)
            }
            return
        }

        return new Promise((resolve, reject) => {
            config["success"] = (response) => {
                let _res = null
                if(_this.responseInterceptor){
                    _res = _this.responseInterceptor(response, config)
                }
                _this.success && _this.success(response)
                successHandler && successHandler(response)
                // 为了对reject的内容更加可控，增加了一个控制字段 wakaryReqToReject
                if(_res.wakaryReqToReject){
                    delete _res.wakaryReqToReject
                    reject(_res)
                }else{
                    resolve(_res)
                }
            }
            config["fail"] = (error) => {
                _this.fail && _this.fail(error)
                failHandler && failHandler(error)
                reject(error)
            } 
            config["complete"] = (response) => {
                _this.complete && _this.complete(response)
                completeHandler && completeHandler(response)
            }
            if( type === "request"){
                uni.request(config)
            } else if(type === "upload"){
                uni.uploadFile(config)
            } else {
                uni.downloadFile(config)
            }
        })
    }
 }