import { describe, it, expect, beforeEach, afterEach, vi } from 'vitest';
import fs from 'node:fs/promises';
import os from 'node:os';
import path from 'node:path';
import crypto from 'node:crypto';

// ---------------------------------------------------------------------------
// Mocks
// ---------------------------------------------------------------------------

// We need to mock config BEFORE importing CookieStore, because the module
// reads config.cookieDir at import time.

let testDir: string;

vi.mock('../src/config/index.js', () => ({
  config: {
    get cookieDir() {
      return testDir;
    },
  },
}));

vi.mock('../src/utils/logger.js', () => ({
  logger: {
    error: vi.fn(),
    warn: vi.fn(),
    info: vi.fn(),
    debug: vi.fn(),
    child: vi.fn(() => ({
      error: vi.fn(),
      warn: vi.fn(),
      info: vi.fn(),
      debug: vi.fn(),
    })),
  },
}));

// Import AFTER mocks are declared.
import { CookieStore, type StorageState } from '../src/cookie/store.js';

// ---------------------------------------------------------------------------
// Helpers
// ---------------------------------------------------------------------------

function makeStorageState(cookieCount = 1): StorageState {
  const cookies = Array.from({ length: cookieCount }, (_, i) => ({
    name: `cookie_${i}`,
    value: `value_${i}`,
    domain: '.example.com',
    path: '/',
    expires: Date.now() / 1000 + 3600,
    httpOnly: true,
    secure: true,
    sameSite: 'Lax' as const,
  }));

  return {
    cookies,
    origins: [],
  };
}

// ---------------------------------------------------------------------------
// Tests
// ---------------------------------------------------------------------------

describe('CookieStore', () => {
  let store: CookieStore;

  beforeEach(async () => {
    testDir = path.join(os.tmpdir(), `cookie-store-test-${crypto.randomUUID()}`);
    await fs.mkdir(testDir, { recursive: true });
    store = new CookieStore();
  });

  afterEach(async () => {
    await fs.rm(testDir, { recursive: true, force: true });
  });

  // -- save ---------------------------------------------------------------

  it('save creates the platform directory', async () => {
    const state = makeStorageState();
    await store.save('twitter', state);

    const dirStat = await fs.stat(path.join(testDir, 'twitter'));
    expect(dirStat.isDirectory()).toBe(true);
  });

  it('save writes the cookie file with restricted permissions (0o600)', async () => {
    const state = makeStorageState();
    await store.save('twitter', state);

    const filePath = store.getPath('twitter');
    const fileStat = await fs.stat(filePath);

    // On Unix-like systems the mode includes the file type bits; mask to
    // the permission bits only.
    const perms = fileStat.mode & 0o777;
    expect(perms).toBe(0o600);
  });

  // -- load ---------------------------------------------------------------

  it('load returns saved data', async () => {
    const state = makeStorageState(3);
    await store.save('instagram', state);

    const loaded = await store.load('instagram');
    expect(loaded).not.toBeNull();
    expect(loaded!.cookies).toHaveLength(3);
    expect(loaded!.cookies[0]!.name).toBe('cookie_0');
  });

  it('load returns null for non-existent platform', async () => {
    const loaded = await store.load('nonexistent');
    expect(loaded).toBeNull();
  });

  // -- delete -------------------------------------------------------------

  it('delete removes the cookie file', async () => {
    const state = makeStorageState();
    await store.save('weibo', state);

    // Verify the file exists first.
    const filePath = store.getPath('weibo');
    await expect(fs.access(filePath)).resolves.toBeUndefined();

    await store.delete('weibo');

    // After deletion the file should no longer exist.
    await expect(fs.access(filePath)).rejects.toThrow();
  });

  it('delete succeeds silently for a non-existent file', async () => {
    // Should not throw even though no file was ever saved.
    await expect(store.delete('ghost')).resolves.toBeUndefined();
  });

  // -- atomic write -------------------------------------------------------

  it('save uses atomic write (temp file renamed to final path)', async () => {
    const state = makeStorageState();

    // Spy on fs.rename to verify it is called.
    const renameSpy = vi.spyOn(fs, 'rename');

    await store.save('atomic-test', state);

    expect(renameSpy).toHaveBeenCalledTimes(1);

    const [tmpArg, finalArg] = renameSpy.mock.calls[0]!;
    expect(String(tmpArg)).toContain('.tmp.');
    expect(String(finalArg)).toBe(store.getPath('atomic-test'));

    renameSpy.mockRestore();
  });
});