import { IFetchConfig } from '../interface/exported';
/**
 * Very simple fetch helper
 * https://developer.mozilla.org/en-US/docs/Web/API/Fetch_API/Using_Fetch
 */
export class FetchClient {


    constructor(private config = {} as IFetchConfig) {
        this.setConfig(config);
    }



    /**
     * setConfig
     *
     */
    public setConfig(config: IFetchConfig) {
        if (config.defaultUrl) {
            this.config.defaultUrl = config.defaultUrl;
        }

        if (config.cache) {
            this.config.cache = config.cache;
        }

        if (config.credentials) {
            this.config.credentials = config.credentials;
        }

        if (config.headers) {
            this.config.headers = config.headers;
        }

        if (config.method) {
            this.config.method = config.method;
        }

        if (config.mode) {
            this.config.mode = config.mode;
        }

        if (config.redirect) {
            this.config.redirect = config.redirect;
        }

        if (config.referrer) {
            this.config.referrer = config.referrer;
        }
    }



    /**
     * getconfig
     *
     */
    public getConfig() {
        return this.config;
    }



    /**
     * fetch
     *
     */
    public fetch(url: string, options: IFetchConfig): Promise<any> {
        const fetchUrl =
            this.config.defaultUrl ? this.config.defaultUrl + url : url;
        const fetchOptions: any = {
            body: options.body ? options.body : undefined,
            cache: options.cache || this.config.cache,
            credentials: options.credentials || this.config.credentials,
            headers: options.headers || this.config.headers,
            method: options.method || this.config.method,
            mode: options.mode || this.config.mode,
            redirect: options.redirect || this.config.redirect,
            referrer: options.referrer || this.config.referrer
        };

        return fetch(fetchUrl, (fetchOptions as any));
    }


}