Refactor server picker and limit ping requests

src/web/utils/serverPicker.js

@@ -0,0 +1,31 @@
+export const SERVER_RESULT_WINDOW = 60;
+
+const searchable = (server) => [
+  server.label,
+  server.host,
+  server.country,
+  server.city,
+  server.provider,
+  server.protocol,
+].filter(Boolean).join(' ').toLocaleLowerCase('ru');
+
+export function filterServers(servers, query) {
+  const needle = String(query || '').trim().toLocaleLowerCase('ru');
+  return needle ? servers.filter((server) => searchable(server).includes(needle)) : servers;
+}
+
+export function serverGroup(server) {
+  return server.country || server.provider || 'Другие';
+}
+
+export function groupServers(servers) {
+  return [...servers.reduce((groups, server) => {
+    const name = serverGroup(server);
+    groups.set(name, [...(groups.get(name) || []), server]);
+    return groups;
+  }, new Map())];
+}
+
+export function autoServer(servers) {
+  return [...servers].sort((left, right) => left.id.localeCompare(right.id))[0] || null;
+}