//Copyright Chris Xiong 2024
//License: Expat (MIT)
module.exports = {
	gen_atom:function(list, config) { _gen_atom(list, config); }
};
const jsdom=require('jsdom');
const path=require('path');
const fs=require('fs');
const htmlescape=require('./util').htmlescape;

function _gen_atom(list, config)
{
	const sorted_list = list.toSorted((a, b) => (new Date(b.date)).getTime() - (new Date(a.date)).getTime());
	let xmlbuf = `<?xml version="1.0" encoding="utf-8"?>`;
	xmlbuf += `<feed xmlns="http://www.w3.org/2005/Atom">`;
	xmlbuf += `<generator uri="https://cgit.chrisoft.org/sbs.git" version="${config.version_string}">SSBS</generator>`;
	xmlbuf += `<updated>${new Date().toISOString()}</updated>`;
	xmlbuf += `<link href="${config.atom_url}" rel="self" type="application/atom+xml" title="Atom"/>`;
	xmlbuf += `<link href="${config.published_url}" rel="alternate" type="text/html"/>`;
	xmlbuf += `<id>${config.atom_url}</id>`;
	xmlbuf += `<title>${config.atom_title}</title>`;
	xmlbuf += `<subtitle>${config.atom_subtitle}</subtitle>`;
	xmlbuf += `<icon>${config.atom_icon}</icon>`;
	xmlbuf += `<logo>${config.atom_icon}</logo>`;
	for (let i = 0; i < sorted_list.length && i < config.atom_feed_nposts; ++i)
	{
		const p = sorted_list[i];
		const postpath = path.join(path.join(config.dest_dir,'post'), `${p.file}.html`);
		const contfull = fs.readFileSync(postpath, 'utf8');
		const doc = new jsdom.JSDOM(contfull).window.document;
		const content = doc.querySelector('article').innerHTML;
		const footnotes = doc.getElementById('notediv').outerHTML;
		const link = `https://chrisoft.org/blog/post/${p.file}.html`;
		xmlbuf += `<entry>`;
		xmlbuf += `<title>${htmlescape(p.title)}</title>`;
		xmlbuf += `<link href="${link}" title="${htmlescape(p.title)}"/>`;
		xmlbuf += `<published>${new Date(p.date).toISOString()}</published>`;
		xmlbuf += `<updated>${new Date(p.mdate).toISOString()}</updated>`;
		xmlbuf += `<id>${link}</id>`;
		xmlbuf += `<author><name>${config.atom_author}</name></author>`
		xmlbuf += `<content type="html" xml:base="${link}"><![CDATA[${content}<br><hr>${footnotes}]]></content>`;
		xmlbuf += `</entry>`;
	}
	xmlbuf += `</feed>`;
	fs.writeFileSync(path.join(config.dest_dir, "atom.xml"), xmlbuf ,'utf8');
}