// @ts-nocheck
import { describe, it, beforeEach, afterEach, mock } from 'node:test';
import assert from 'node:assert/strict';
import { makeChromeMock } from './chrome-mock';
import { AutoSaveManager } from '../src/commands/autosave';

let chromeMock;
let session;

// Flush pending microtasks/promise chains after advancing fake timers.
// setImmediate stays real (only setTimeout is mocked), so it yields a
// macrotask boundary that drains the microtask queue between iterations.
async function drain() {
  for (let i = 0; i < 10; i++) await new Promise(r => setImmediate(r));
}
async function tick(ms) {
  mock.timers.tick(ms);
  await drain();
}

beforeEach(() => {
  chromeMock = makeChromeMock();
  globalThis.chrome = chromeMock;
  mock.timers.enable({ apis: ['setTimeout'] });
  session = new AutoSaveManager();
});

afterEach(async () => {
  // Clear any pending debounce timer + instance state before tearing down timers.
  await session.setEnabled(false);
  await drain();
  mock.timers.reset();
  delete globalThis.chrome;
});

const TAB_EVENTS = ['onCreated', 'onRemoved', 'onMoved', 'onAttached', 'onDetached'];

describe('sessionAutoSave listener wiring', () => {
  it('registers a handler on every tab mutation event + tabGroups when enabled', async () => {
    await session.setEnabled(true);
    for (const ev of TAB_EVENTS) {
      assert.equal(chromeMock.tabs[ev]._size(), 1, `tabs.${ev}`);
    }
    assert.equal(chromeMock.tabs.onUpdated._size(), 1);
    assert.equal(chromeMock.tabGroups.onUpdated._size(), 1);
  });

  it('removes all listeners when disabled (no leaked subscriptions)', async () => {
    await session.setEnabled(true);
    await session.setEnabled(false);
    for (const ev of TAB_EVENTS) {
      assert.equal(chromeMock.tabs[ev]._size(), 0, `tabs.${ev}`);
    }
    assert.equal(chromeMock.tabs.onUpdated._size(), 0);
    assert.equal(chromeMock.tabGroups.onUpdated._size(), 0);
  });

  it('does not double-register when enabled twice', async () => {
    await session.setEnabled(true);
    await session.setEnabled(true);
    for (const ev of TAB_EVENTS) {
      assert.equal(chromeMock.tabs[ev]._size(), 1, `tabs.${ev}`);
    }
  });
});

describe('autosave debounce / coalescing', () => {
  it('collapses a burst of tab events into a single snapshot+save', async () => {
    await session.setEnabled(true);
    chromeMock.tabs.query.mock.resetCalls();

    // Simulate rapidly opening/closing several tabs.
    await session.autoSaveHandler();
    await session.autoSaveHandler();
    await session.autoSaveHandler();
    await session.autoSaveHandler();

    // Nothing should have run yet — still inside the debounce window.
    assert.equal(chromeMock.tabs.query.mock.callCount(), 0);

    await tick(3000);

    // The whole burst produced exactly one snapshot read.
    assert.equal(chromeMock.tabs.query.mock.callCount(), 1);
  });

  it('does not fire before the (raised) 3s debounce window elapses', async () => {
    await session.setEnabled(true);
    chromeMock.tabs.query.mock.resetCalls();

    await session.autoSaveHandler();
    await tick(2999);
    assert.equal(chromeMock.tabs.query.mock.callCount(), 0);

    await tick(1);
    assert.equal(chromeMock.tabs.query.mock.callCount(), 1);
  });

  it('ignores tab updates that do not change the URL (no save scheduled)', async () => {
    await session.setEnabled(true);
    chromeMock.tabs.query.mock.resetCalls();

    // status/favicon/title churn — not a URL change.
    await session.autoSaveUpdatedHandler(1, { status: 'loading' });
    await session.autoSaveUpdatedHandler(1, { favIconUrl: 'x' });
    await session.autoSaveUpdatedHandler(1, { title: 'y' });

    await tick(3000);
    assert.equal(chromeMock.tabs.query.mock.callCount(), 0);
  });

  it('schedules a save when a URL change is observed', async () => {
    await session.setEnabled(true);
    chromeMock.tabs.query.mock.resetCalls();

    await session.autoSaveUpdatedHandler(1, { url: 'https://example.com' });
    await tick(3000);
    assert.equal(chromeMock.tabs.query.mock.callCount(), 1);
  });

  it('does nothing when autosave is disabled even if a handler fires', async () => {
    // Never enabled: storage has no autoSave flag.
    await session.autoSaveHandler();
    await tick(3000);
    assert.equal(chromeMock.tabs.query.mock.callCount(), 0);
  });
});