const { JSDOM } = require("jsdom");
const graphology = require("graphology");
const { circular } = require('graphology-layout');


const graphQueryString = `
	select p.number, p.html, p.time, a.contents
	from pages p
	left join attributes a on a.number = p.number
	where time >= (
		select max(s.time) 
		from pages s
		where s.number = p.number
	)
	order by p.time desc
	`;

function graphFromList(allTheStuff) {
	const graph = new graphology.Graph();
	for (const {number, html} of allTheStuff) {
		if (!graph.hasNode(number)) graph.addNode(number);
	}

	for (const {number, html, contents} of allTheStuff) {
		const { document } = (new JSDOM(html)).window;
		const links = document.querySelectorAll('a');
		links.forEach((link) => {
			const referent = link.href.replace("/","");
			graph.mergeEdge(number, referent, {color: "white"});
		});
		
		if (typeof contents?.verbs?.forEach === 'function') {
			contents?.verbs?.forEach((verbNumber) => {
				graph.mergeEdge(number, verbNumber, {color: "red"})
			});
		}

		if (typeof contents?.contents?.forEach === 'function') {
			contents?.contents?.forEach((nounNumber) => {
				graph.mergeEdge(number, nounNumber, {color: "green"});
			});
		}
	}

	circular.assign(graph);

	return graph;
}

module.exports = { graphFromList, graphQueryString };