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

export class Api {
    private api: AxiosInstance

    public constructor (config: AxiosRequestConfig) {
        this.api = axios.create(config)
       
        // this middleware is been called right before the http request is made.
        this.api.interceptors.request.use((param: AxiosRequestConfig) => ({
            ...param
        }))
       
        // this middleware is been called right before the response is get it by the method that triggers the request
        this.api.interceptors.response.use((param: AxiosResponse) => ({
            ...param
        }))
        /**
        可以在这里定义一些header
        this.api.defaults.headers.common['x-api-key'] = KEY
        */
    }

    public getUri (config?: AxiosRequestConfig): string {
        return this.api.getUri(config)
    }

    public request<T, R = AxiosResponse<T>> (config: AxiosRequestConfig): Promise<R> {
        return this.api.request(config);
    }
    //url需要自己定义
    public get<T, R = AxiosResponse<T>> (url: string, config?: AxiosRequestConfig): Promise<R> {
        return this.api.get(url, config);
    }

    public delete<T, R = AxiosResponse<T>> (url: string, config?: AxiosRequestConfig): Promise<R> {
        return this.api.delete(url, config);
    }

    public head<T, R = AxiosResponse<T>> (url: string, config?: AxiosRequestConfig): Promise<R> {
        return this.api.head(url, config);
    }

    public post<T, R = AxiosResponse<T>> (url: string, data?: string, config?: AxiosRequestConfig): Promise<R> {
        return this.api.post(url, data, config);
    }

    public put<T, R = AxiosResponse<T>> (url: string, data?: string, config?: AxiosRequestConfig): Promise<R> {
        return this.api.put(url, data, config);
    }

    public patch<T, R = AxiosResponse<T>> (url: string, data?: string, config?: AxiosRequestConfig): Promise<R> {
        return this.api.patch(url, data, config);
    }
}

export class UserApi extends Api {
    constructor (config: AxiosRequestConfig) {
        // NEVER FORGET THE SUPER
        super(config);
    }
   
    async addUser(user: User): Promise<User|null> {
      const resource = '/user'
      const result = await this.post<User[]>(resource, user)
      return (result && result.data && result.data.length > 0) ? result.data[0] : null
    }
}