const got = require('got')
const { collect } = require('./rsslinkcollector')
const { discover } = require('./linkdiscoverer')

async function mention(opts) {
	const { source, target } = opts
	const endpoint = await discover(target)
	if(endpoint) {
		await got.post(endpoint, {
			contentType: "x-www-form-urlencoded",
			form: {
				source,
				target
			},
			retry: {
				limit: 5,
				methods: ["POST"]
			}
		})
		console.log(` OK: webmention@${endpoint}, sent: source ${source}, target ${target}`)
	}
}

async function parseRssFeed(xml, since) {
	const linksToMention = collect(xml, since)
		.map(el => el.hrefs
			// this strips relative URLs; could be a feature to also send these to own domain?
			.filter(href => href.startsWith('http'))
			.map(href => {
			return {
				// SOURCE is own domain this time, TARGET = outbound
				target: href,
				source: el.link
			}
		}))
		.flat()

	await Promise.all(linksToMention.map(mention))
}


async function send(domain, since) {
	const feed = await got(`https://${domain}/index.xml`)
	await parseRssFeed(feed.body, since)
}

module.exports = {
	send
}