import assert from 'node:assert/strict';
import test from 'node:test';

import {
  parseSubscriptionBody,
  selectRefreshedServer,
} from '../../src/server/subscription.js';

const parse = (outbounds) => parseSubscriptionBody(JSON.stringify({ outbounds }));
const outbound = (tag, server, server_port = 443) => ({
  type: 'vless',
  tag,
  server,
  server_port,
});

test('duplicate labels remain independently addressable by stable ID', () => {
  const { config, servers } = parse([
    outbound('Amsterdam', 'nl-1.example'),
    outbound('Amsterdam', 'nl-2.example'),
  ]);

  assert.equal(servers.length, 2);
  assert.equal(servers[0].label, 'Amsterdam');
  assert.equal(servers[1].label, 'Amsterdam');
  assert.notEqual(servers[0].id, servers[1].id);
  assert.deepEqual(config.outbounds.map((item) => item.tag), servers.map((server) => server.id));
});

test('provider reorder does not change server IDs or selection', () => {
  const before = parse([outbound('DE', 'de.example'), outbound('NL', 'nl.example')]).servers;
  const after = parse([outbound('NL', 'nl.example'), outbound('DE', 'de.example')]).servers;
  const selectedId = before[1].id;

  assert.deepEqual(
    new Map(after.map((server) => [server.host, server.id])),
    new Map(before.map((server) => [server.host, server.id])),
  );
  assert.equal(selectRefreshedServer(selectedId, before, after), selectedId);
});

test('cosmetic rename keeps selection for the same endpoint', () => {
  const before = parse([outbound('Old name', 'nl.example')]).servers;
  const after = parse([outbound('New name', 'nl.example')]).servers;

  assert.equal(after[0].id, before[0].id);
  assert.equal(selectRefreshedServer(before[0].id, before, after), before[0].id);
});

test('removed selected server requires an explicit new choice', () => {
  const before = parse([outbound('DE', 'de.example'), outbound('NL', 'nl.example')]).servers;
  const after = parse([outbound('DE', 'de.example')]).servers;

  assert.equal(selectRefreshedServer(before[1].id, before, after), '');
  assert.equal(selectRefreshedServer('', before, after), '');
});