import { shouldForceMongoReconnect, MongoReconnectState } from './mongo-reconnect-guard.util';

/**
 * A Mongo reconnect-guard PURE döntés-magjának unit-tesztjei. A helyesség kritikus, mert ez dönti
 * el, hogy egy futó service force-reconnectolja-e a Mongo-kapcsolatát (disconnect+connect →
 * re-resolve). Healthy connection-t SOHA nem szabad bántani; csak tartós nem-connected + grace +
 * cooldown letelt esetén szabad force-reconnectolni.
 */
describe('| mongo-reconnect-guard shouldForceMongoReconnect', () => {
  const base: MongoReconnectState = {
    readyState: 0,
    msSinceUnhealthy: 60_000,         // 60s unhealthy (a 30s grace fölött)
    unhealthyGraceMs: 30_000,
    reconnectInFlight: false,
    msSinceLastReconnect: Number.POSITIVE_INFINITY,
    reconnectCooldownMs: 20_000,
  };

  it('| connected (readyState=1) → SOHA nem reconnect (a healthy connection-t nem bántjuk)', () => {
    expect(shouldForceMongoReconnect({ ...base, readyState: 1 }).reconnect).toBe(false);
  });

  it('| connecting (readyState=2) → nem reconnect (hagyjuk a drivert befejezni)', () => {
    expect(shouldForceMongoReconnect({ ...base, readyState: 2 }).reconnect).toBe(false);
  });

  it('| disconnected + grace + cooldown letelt + nincs in-flight → RECONNECT', () => {
    const d = shouldForceMongoReconnect({ ...base, readyState: 0 });
    expect(d.reconnect).toBe(true);
    expect(d.reason).toContain('re-resolve');
  });

  it('| disconnecting (readyState=3) ugyanígy → RECONNECT (tartós nem-connected)', () => {
    expect(shouldForceMongoReconnect({ ...base, readyState: 3 }).reconnect).toBe(true);
  });

  it('| grace-en BELÜL → nem reconnect (hagyjuk a driver saját reconnect-jét előbb)', () => {
    expect(shouldForceMongoReconnect({ ...base, msSinceUnhealthy: 10_000 }).reconnect).toBe(false);
  });

  it('| cooldown-on belül (frissen reconnectoltunk) → nem reconnect (anti-thrash)', () => {
    expect(shouldForceMongoReconnect({ ...base, msSinceLastReconnect: 5_000 }).reconnect).toBe(false);
  });

  it('| már van in-flight reconnect → nem indítunk másikat', () => {
    expect(shouldForceMongoReconnect({ ...base, reconnectInFlight: true }).reconnect).toBe(false);
  });

  it('| pontosan a grace-küszöbön (msSinceUnhealthy === grace) → RECONNECT', () => {
    expect(shouldForceMongoReconnect({ ...base, msSinceUnhealthy: 30_000, unhealthyGraceMs: 30_000 }).reconnect).toBe(true);
  });
});