"use strict";

let usimp = {};

usimp.lookup = function (domain_name) {
    return fetch(`https://${domain_name}/.well-known/usimp.json`, {
        redirect: "manual",
    });
}

usimp.chooseDomainServer = function (domainServers, invalidDomainServers = []) {
    if (domainServers.length === 0) throw Error("No domain servers specified");

    domainServers.filter(srv => invalidDomainServers.map(srv => srv.id).includes(srv.id));
    if (domainServers.length === 0) throw Error("No domain servers reachable");
    if (domainServers.length === 1) return domainServers[0];

    let priority = domainServers.reduce((min, srv) => Math.min(min, srv.priority), Infinity);
    domainServers = domainServers.filter(srv => srv.priority === priority);
    if (domainServers.length === 1) return domainServers[0];

    let totalWeight = domainServers.reduce((total, srv) => total + srv.weight, 0);
    let w = Math.floor(Math.random() * totalWeight);

    let accumulator = 0;
    for (let srv of domainServers) {
        accumulator += srv.weight;
        if (w < accumulator) return srv;
    }

    console.warn("Domain server selection not worked correctly");
    return domainServers[0];
}

usimp.login = function (domainServer, accountName, password) {
    return fetch(``)
}