import type { AxiosRequestConfig, AxiosInstance, AxiosResponse } from 'axios';

import axios from 'axios';
import { AxiosCanceler } from './axiosCancel';
import { isFunction } from '/@/utils/is';
import { cloneDeep } from 'lodash-es';

import type { RequestOptions, CreateAxiosOptions, Result } from './types';
import { ContentTypeEnum } from '/@/enums/httpEnum';
import { errorResult } from './const';

export * from './axiosTransform';

/**
 * @description:  axios模块
 */
export class VAxios {
  private axiosInstance: AxiosInstance;
  private options: CreateAxiosOptions;

  constructor(options: CreateAxiosOptions) {
    this.options = options;
    this.axiosInstance = axios.create(options);
    this.setupInterceptors();
  }

  /**
   * @description:  创建axios实例
   */
  private createAxios(config: CreateAxiosOptions): void {
    this.axiosInstance = axios.create(config);
  }

  private getTransform() {
    const { transform } = this.options;
    return transform;
  }

  getAxios(): AxiosInstance {
    return this.axiosInstance;
  }

  /**
   * @description: 重新配置axios
   */
  configAxios(config: CreateAxiosOptions) {
    if (!this.axiosInstance) {
      return;
    }
    this.createAxios(config);
  }

  /**
   * @description: 设置通用header
   */
  setHeader(headers: any): void {
    if (!this.axiosInstance) {
      return;
    }
    Object.assign(this.axiosInstance.defaults.headers, headers);
  }

  /**
   * @description: 拦截器配置
   */
  private setupInterceptors() {
    const transform = this.getTransform();
    if (!transform) {
      return;
    }
    const {
      requestInterceptors,
      requestInterceptorsCatch,
      responseInterceptors,
      responseInterceptorsCatch,
    } = transform;

    const axiosCanceler = new AxiosCanceler();

    // 请求拦截器配置处理
    this.axiosInstance.interceptors.request.use((config: AxiosRequestConfig) => {
      const { headers: { ignoreCancelToken } = { ignoreCancelToken: false } } = config;
      !ignoreCancelToken && axiosCanceler.addPending(config);
      if (requestInterceptors && isFunction(requestInterceptors)) {
        config = requestInterceptors(config);
      }
      return config;
    }, undefined);

    // 请求拦截器错误捕获
    requestInterceptorsCatch &&
      isFunction(requestInterceptorsCatch) &&
      this.axiosInstance.interceptors.request.use(undefined, requestInterceptorsCatch);

    // 响应结果拦截器处理
    this.axiosInstance.interceptors.response.use((res: AxiosResponse<any>) => {
      res && axiosCanceler.removePending(res.config);
      if (responseInterceptors && isFunction(responseInterceptors)) {
        res = responseInterceptors(res);
      }
      return res;
    }, undefined);

    // 响应结果拦截器错误捕获
    responseInterceptorsCatch &&
      isFunction(responseInterceptorsCatch) &&
      this.axiosInstance.interceptors.response.use(undefined, responseInterceptorsCatch);
  }

  /**
   * @description:  文件上传
   */
  uploadFiles(config: AxiosRequestConfig, params: File[]) {
    const formData = new FormData();

    Object.keys(params).forEach((key) => {
      formData.append(key, params[key as any]);
    });

    return this.request({
      ...config,
      method: 'POST',
      data: formData,
      headers: {
        'Content-type': ContentTypeEnum.FORM_DATA,
      },
    });
  }

  /**
   * @description:   请求方法
   */
  request<T = any>(config: AxiosRequestConfig, options?: RequestOptions): Promise<T> {
    let conf: AxiosRequestConfig = cloneDeep(config);
    const transform = this.getTransform();

    const { requestOptions } = this.options;

    const opt: RequestOptions = Object.assign({}, requestOptions, options);

    const { beforeRequestHook, requestCatch, transformRequestData } = transform || {};
    if (beforeRequestHook && isFunction(beforeRequestHook)) {
      conf = beforeRequestHook(conf, opt);
    }
    return new Promise((resolve, reject) => {
      this.axiosInstance
        .request<any, AxiosResponse<Result>>(conf)
        .then((res: AxiosResponse<Result>) => {
          if (transformRequestData && isFunction(transformRequestData)) {
            const ret = transformRequestData(res, opt);
            ret !== errorResult ? resolve(ret) : reject(new Error('request error!'));
            return;
          }
          resolve((res as unknown) as Promise<T>);
        })
        .catch((e: Error) => {
          if (requestCatch && isFunction(requestCatch)) {
            reject(requestCatch(e));
            return;
          }
          reject(e);
        });
    });
  }
}
