import { Options } from 'xml2js';

export interface Headers
{
    readonly Accept: string;
    readonly 'User-Agent': string;
}

export interface CustomFields
{
    readonly feed?: string[];
    readonly item?: string[] | string[][];
}

export interface ParserOptions
{
    readonly xml2js?: Options;
    readonly headers?: Headers;
    readonly defaultRSS?: number;
    readonly maxRedirects?: number;
    readonly customFields?: CustomFields;
}

export interface Items {
    [key: string]: any;
    link?: string;
    guid?: string;
    title?: string;
    pubDate?: string;
    creator?: string;
    content?: string;
    isoDate?: string;
    categories?: string[];
    contentSnippet?: string;
}

export interface Output {
    [key: string]: any;
    link?: string;
    title?: string;
    items?: Items[];
    feedUrl?: string;
    description?: string;
    itunes?: {
        [key: string]: any;
        image?: string;
        owner?: {
            name?: string;
            email?: string;
        };
        author?: string;
        summary?: string;
        explicit?: string;
    };
}

/**
 * Class that handles all parsing or URL, or even XML, RSS feed to JSON.
 */
declare const Parser: {
    /**
     * @param options - Parser options.
     */
    new(options?: ParserOptions): {
       /**
        * Parse XML content to JSON.
        *
        * @param xml - The xml to be parsed.
        * @param callback - Traditional callback.
        *
        * @returns Promise that has the same Output as the callback.
        */
        parseString(xml: string, callback?: (err: Error, feed: Output) => void): Promise<Output>;

        /**
         * Parse URL content to JSON.
         *
         * @param feedUrl - The url that needs to be parsed to JSON.
         * @param callback - Traditional callback.
         * @param redirectCount - Max of redirects, default is set to five.
         *
         * @example
         * await parseURL('https://www.reddit.com/.rss');
         * parseURL('https://www.reddit.com/.rss', (err, feed) => { ... });
         *
         * @returns Promise that has the same Output as the callback.
         */
        parseURL(feedUrl: string, callback?: (err: Error, feed: Output) => void, redirectCount?: number): Promise<Output>;
    };
}
export default Parser