import assert from 'node:assert/strict';
import test from 'node:test';
import {
  createSessionBrokerMetrics,
  formatSessionBrokerMetric,
  isSessionBrokerMetricsEnabled,
} from './session-broker-metrics.mjs';

test('isSessionBrokerMetricsEnabled respects env flag', () => {
  assert.equal(isSessionBrokerMetricsEnabled({}), false);
  assert.equal(isSessionBrokerMetricsEnabled({ MEMIND_SESSION_BROKER_METRICS: '1' }), true);
});

test('createSessionBrokerMetrics emits structured lines when enabled', () => {
  const lines = [];
  const metrics = createSessionBrokerMetrics({
    enabled: true,
    logger: { log: (line) => lines.push(line) },
  });
  metrics.ownershipDenied({ userId: 'u1', sessionId: 's1' });
  metrics.registerDuplicate({ userId: 'u1', sessionId: 's1', target: 'https://127.0.0.1:18006' });
  metrics.resolveTargetMiss({ sessionId: 's1', node: 2, reason: 'legacy_node_fallback' });
  assert.equal(lines.length, 3);
  assert.match(lines[0], /\[session_broker\.ownership\.denied\]/);
  assert.match(lines[1], /register\.duplicate/);
  assert.match(lines[2], /resolve_target\.miss/);
  assert.match(formatSessionBrokerMetric('ownership.denied', { sessionId: 's1' }), /"sessionId":"s1"/);
});

test('createSessionBrokerMetrics stays silent when disabled', () => {
  const lines = [];
  const metrics = createSessionBrokerMetrics({
    enabled: false,
    logger: { log: (line) => lines.push(line) },
  });
  metrics.ownershipDenied({ userId: 'u1', sessionId: 's1' });
  assert.equal(lines.length, 0);
});