import * as fsp from 'fs/promises';
import * as os from 'os';
import * as path from 'path';
import {
  afterEach,
  describe,
  expect,
  it
} from 'vitest';
import {
  clearHighMemoryAlert,
  readHighMemoryAlert,
  resolveHighMemoryAlertPath,
  writeHighMemoryAlert
} from './high-memory-alert.store';

describe('high-memory-alert.store', () => {
  const tempDirs: string[] = [];

  afterEach(async () => {
    await Promise.all(tempDirs.splice(0).map((dir) => fsp.rm(dir, {
      recursive: true,
      force: true
    })));
  });

  it('writes and reads a pending startup alert record', async () => {
    const userDataPath = await fsp.mkdtemp(path.join(os.tmpdir(), 'metoyou-high-memory-'));

    tempDirs.push(userDataPath);

    const record = {
      logFilePath: path.join(userDataPath, 'diagnostics', 'perf-session.jsonl'),
      detectedAt: 1_700_000_000_000,
      peakWorkingSetKb: 2_200_000,
      sessionId: 'session-1'
    };

    await writeHighMemoryAlert(userDataPath, record);

    expect(resolveHighMemoryAlertPath(userDataPath)).toBe(
      path.join(userDataPath, 'diagnostics', 'high-memory-pending.json')
    );

    expect(await readHighMemoryAlert(userDataPath)).toEqual(record);
  });

  it('clears the pending startup alert record', async () => {
    const userDataPath = await fsp.mkdtemp(path.join(os.tmpdir(), 'metoyou-high-memory-'));

    tempDirs.push(userDataPath);

    await writeHighMemoryAlert(userDataPath, {
      logFilePath: '/tmp/perf.jsonl',
      detectedAt: Date.now(),
      peakWorkingSetKb: 2_100_000,
      sessionId: 'session-2'
    });

    await clearHighMemoryAlert(userDataPath);

    expect(await readHighMemoryAlert(userDataPath)).toBeNull();
  });
});