import {
  beforeEach,
  describe,
  expect,
  it,
  vi
} from 'vitest';
import * as os from 'os';
import * as path from 'path';
import * as fsp from 'fs/promises';

import { captureHighMemoryDiagnostics } from './high-memory-capture';

vi.mock('./immediate-renderer-samples.collector', () => ({
  collectImmediateRendererSamples: vi.fn(async () => [])
}));

vi.mock('./session-context.collector', () => ({
  collectSessionContext: vi.fn(() => ({
    platform: 'linux',
    userDataPath: '/tmp/user-data'
  }))
}));

describe('captureHighMemoryDiagnostics', () => {
  let userDataPath = '';

  beforeEach(async () => {
    userDataPath = await fsp.mkdtemp(path.join(os.tmpdir(), 'metoyou-high-memory-capture-'));
  });

  it('writes a diagnostics snapshot and returns an alert record', async () => {
    const record = await captureHighMemoryDiagnostics({
      userDataPath,
      sessionStartedAt: Date.now() - 60_000,
      metrics: {
        collectedAt: Date.now(),
        processes: [
          {
            pid: 1,
            type: 'Browser',
            workingSetKb: 2_200_000
          }
        ]
      },
      totalWorkingSetKb: 2_200_000,
      writer: null,
      mainWindow: null,
      reason: 'manual'
    });

    expect(record.peakWorkingSetKb).toBe(2_200_000);
    expect(record.reason).toBe('manual');
    expect(record.logFilePath).toContain(userDataPath);
    await expect(fsp.stat(record.logFilePath)).resolves.toBeDefined();
  });
});