#!/usr/bin/env nodejsscript
/* jshint esversion: 11,-W097, -W040, module: true, node: true, expr: true, undef: true *//* global echo, $, pipe, s, fetch, cyclicLoop */
const instances_cz_pre= new Set([
	"mastodonczech.cz",
	"mastodon.arch-linux.cz",
	"nasface.cz",
	"witter.cz",
	"cztwitter.cz",
	"mastodon.pirati.cz",
	"gomastodon.cz",
	"f.cz",
	"toot.whatever.cz",
	"mastodon.macsnet.cz",
	"lgbtcz.social",
	"kompost.cz",
	"boskovice.social",
	"propulse.club",
	"mastodon.1984.cz",
	"mastodon.rozhlas.cz",
	"fediverse.cz",
	"mastodon.queerclub.cz",
	"mastodon.urbancloud.cz",
	"kocour.club",
	"mastodon.telekomunikace.cz",
	"ajtaci.club",
	"mastodon.darksheep.social",
	"social.filik.eu",
	"social.meyer.cz",
	"mastodon.posvic.cz",
	"mastodon.starnet.cz",
	"blogator.com",
	"hatedon.1984.cz",
	"mastodon.loutaci.cz",
	"social.gwei.cz",
	"mastodon.vyboh.net",
	"mastodon.skorpil.cz",
	"mastodon.hinata.cz",
	"social.toxwat.cz",
	"spondr.cz",
	"hlidacstatu.social",
	"mastodon.train.cz",
	"social.bobek.cz",
	"social.blep.cz",
	"mastodon.kickme.cz",
	"mastodon.starlink.cz",
	"mastodon.kiklhorn.cz",
	"mastodon.haxo.cz",
	"mutant.cz",
	"masto.den1.cz",
	"mastodon.gmb.cz",
	"rodina-sucha.cz",
	"social.taborsky.cz",
]);
const timeOut= (l= 500)=> AbortSignal.timeout(l);
(async function main(){
	let stats= [];
	for(const instance of instances_cz_pre){
		echo.use("-R", "Shromažďuji instance: " + instance);
		const peers= await fetch("https://"+instance+"/api/v1/instance/peers", { signal: timeOut() })
			.then(res=> res.json()).catch(()=> []);
		if(peers && Array.isArray(peers))
			peers.filter(i=> i.endsWith(".cz")).forEach(i=> instances_cz_pre.add(i));
	}
	const instances_cz= Array.from(instances_cz_pre);
	const { length }= instances_cz;
	for await(const data of collectStats(instances_cz, 4)){
		echo.use("-R", "Shromažďuji data za instance: " + instances_cz.indexOf(data.instance)+"/"+length+": "+data.instance);
		stats.push(data);
	}
	const out= {
		instances_cz: stats.sort((a, b)=> b.registrations-a.registrations),
		sum: stats.reduce((acc, stats) => sumStats([acc, stats]), { statuses: 0, logins: 0, registrations: 0, mau: 0, user_count: 0 })
	};
	echo(JSON.stringify(out, null, "	")).to("./mastodonCzStats.json");
	$.exit(0);
})();

async function* collectStats(instances, weeks = 1) {
	for(const instance of instances){
		const { stats, mau, user_count }= await fetchInstanceStats(instance).catch(e=> ({}));
		if(!stats || !Array.isArray(stats)) continue;
		yield { instance, mau, user_count, ...sumStats(stats.slice(0, weeks + 1)) };
	}
}
function sumStats(arr) {
	const out= Object.keys(arr[0]).reduce((acc, curr)=> (acc[curr]= 0, acc), {});
	for (const key of Object.keys(out))
		for (const s of arr) out[key]+= Number(s[key]);
	return out;
}
async function fetchInstanceStats(instance) {
	const url_main= "https://" + instance + "/api/";
	const stats= await fetch(url_main+"v1/instance/activity", { signal: timeOut() }).then(res=> res.json());
	const { usage: { users } }= await fetch(url_main+"v2/instance", { signal: timeOut() }).then(res=> res.json());
	const { stats: { user_count } }= await fetch(url_main+"v1/instance", { signal: timeOut() }).then(res=> res.json());
	return { instance, stats, mau: users.active_month, user_count };
}