const Parser = require('rss-parser');
const parser = new Parser();

const ORG = {
	CH : 1,
	BR: 1070,
	EDI: 301,
	BAG : 317,
};



const base_url = 'https://www.newsd.admin.ch/newsd/feeds/rss';
//https://www.news.admin.ch/dienstleistungen/00008/00131/00146/index.html?lang=fr&rss-id=1_35
const get_url = function(opts){
	const lang = opts.lang || 'de';
	const org_nr = opts.org || '301';
	const offer_nr = opts.offer || '';
	const topic = opts.topic || '';
	const sdate = opts.sdate || opts.since || '-1';
	const edate = opts.edate || '';
	const kind = opts.kind || 'M';//M,R,...
	return base_url+'?'+
			'&lang='+lang+
			'&org-nr='+org_nr+
			'&topic='+topic+
			//'&keyword='+
			'&offer-nr='+offer_nr+
			//'&catalogueElement='+
			'&kind='+kind+
			'&start_date='+sdate+
			'&end_date='+edate;
}

const get_rss = function(url,min_id){
	return parser.parseURL(url).then(feed=>feed.items).then(items=>{
		let idx = items.findIndex(i => parseInt(i.guid) === min_id);
		console.log(idx);
		if(idx>=0) return items.slice(0,idx).reverse();
		else return items.reverse();
	});
}
get_rss(get_url({org:ORG.BR, lang:'de',since:-6}),79718).then(r=>{
	r.forEach(item=>{
		console.log(`${item.title} (${item.guid}): ${item.link}`);
	})
	console.log(r.pop());
})