// Unit tests for the per-space vault path resolver + lazy VaultGit cache
// `mkdir` and the git-sync loader are mocked so construction is cheap and
// no real filesystem / git work happens. We assert the path normalization
// (trailing slash) and the one-VaultGit-per-space caching contract.
//
// The service loads `VaultGit` (and `vaultGitEnv`) at runtime via the
// `loadGitSync()` bridge (the ESM `@docmost/git-sync` package cannot be
// `require()`d under jest), so we mock that loader rather than the package.
import { mkdir } from 'node:fs/promises';
import { execFile } from 'node:child_process';
import { loadGitSync } from '../git-sync.loader';

jest.mock('node:fs/promises', () => ({
  mkdir: jest.fn(async () => undefined),
}));

// ensureServable shells out via `promisify(execFile)`; mock execFile with a
// callback-style fn so promisify resolves. Each `git config <key> <value>` call
// is recorded so the config writes (incl. the security-critical
// receive.denyNonFastForwards=true and core.symlinks=false) can be asserted.
jest.mock('node:child_process', () => ({
  execFile: jest.fn((_cmd: string, _args: string[], _opts: any, cb: any) =>
    cb(null, { stdout: '', stderr: '' }),
  ),
}));

// Cheap VaultGit stub: records the path it was constructed with; no shell-out.
// `ensureRepo` is a resolved jest.fn so ensureServable can call it. Declared with
// a `mock`-prefixed name so jest allows referencing it inside the hoisted
// `jest.mock` factory below.
const mockVaultGit = jest
  .fn()
  .mockImplementation((path: string) => ({
    path,
    ensureRepo: jest.fn().mockResolvedValue(undefined),
  }));

jest.mock('../git-sync.loader', () => ({
  loadGitSync: jest.fn(async () => ({
    VaultGit: mockVaultGit,
    vaultGitEnv: jest.fn(() => ({})),
  })),
}));

import { VaultRegistryService } from './vault-registry.service';

type AnyMock = jest.Mock;

const mkdirMock = mkdir as unknown as AnyMock;
const execFileMock = execFile as unknown as AnyMock;
const VaultGitMock = mockVaultGit;
void loadGitSync;

function build(dataDir: string): { service: VaultRegistryService } {
  const env = {
    getGitSyncDataDir: jest.fn(() => dataDir),
    getGitSyncBackendTimeoutMs: jest.fn(() => 120000),
  };
  const service = new VaultRegistryService(env as any);
  return { service };
}

beforeEach(() => {
  jest.clearAllMocks();
});

describe('VaultRegistryService', () => {
  describe('vaultPath', () => {
    it('normalizes a trailing slash in the data dir (no double slash)', () => {
      const { service } = build('/vaults/');
      expect(service.vaultPath('space-1')).toBe('/vaults/space-1');
    });

    it('works without a trailing slash too', () => {
      const { service } = build('/vaults');
      expect(service.vaultPath('space-1')).toBe('/vaults/space-1');
    });
  });

  describe('getVault lazy cache', () => {
    it('returns the SAME instance on a second call (one VaultGit per space)', async () => {
      const { service } = build('/vaults');

      const first = await service.getVault('space-1');
      const second = await service.getVault('space-1');

      // Same cached instance, constructed exactly once.
      expect(second).toBe(first);
      expect(VaultGitMock).toHaveBeenCalledTimes(1);
      expect(VaultGitMock).toHaveBeenCalledWith('/vaults/space-1');
      // mkdir is only run on the first (cache-miss) construction.
      expect(mkdirMock).toHaveBeenCalledTimes(1);
      expect(mkdirMock).toHaveBeenCalledWith('/vaults/space-1', {
        recursive: true,
      });
    });
  });

  describe('ensureServable', () => {
    it('ensures the repo then writes the force-push-protection + symlink-guard git configs', async () => {
      const { service } = build('/vaults');

      const path = await service.ensureServable('space-1');
      expect(path).toBe('/vaults/space-1');

      // ensureRepo ran first on the cached vault.
      const vault = await service.getVault('space-1');
      expect((vault as any).ensureRepo).toHaveBeenCalledTimes(1);

      // Collect every `git config <key> <value>` write.
      const configWrites = execFileMock.mock.calls
        .filter(([cmd, args]) => cmd === 'git' && args[0] === 'config')
        .map(([, args]) => [args[1], args[2]]);

      expect(configWrites).toEqual([
        ['receive.denyCurrentBranch', 'updateInstead'],
        // Security-critical: blocks force-push / history rewrites on main.
        ['receive.denyNonFastForwards', 'true'],
        ['http.receivepack', 'true'],
        ['http.uploadpack', 'true'],
        // Security-critical (PR #119 review): a pushed symlink is checked out as
        // a plain file, never a real link, so it cannot be followed to leak/
        // overwrite a file outside the vault.
        ['core.symlinks', 'false'],
      ]);

      // Every config write targets THIS vault's cwd and is time-bounded so a
      // wedged git cannot hang the request path.
      for (const [cmd, args, opts] of execFileMock.mock.calls) {
        if (cmd === 'git' && args[0] === 'config') {
          expect(opts.cwd).toBe('/vaults/space-1');
          expect(opts.timeout).toBe(120000);
        }
      }
    });

    it('rejects (and writes no git config) when ensureRepo rejects', async () => {
      const { service } = build('/vaults');
      const vault = await service.getVault('space-1');
      (vault as any).ensureRepo.mockRejectedValueOnce(new Error('init failed'));

      await expect(service.ensureServable('space-1')).rejects.toThrow(
        'init failed',
      );

      const configWrites = execFileMock.mock.calls.filter(
        ([cmd, args]) => cmd === 'git' && args[0] === 'config',
      );
      expect(configWrites).toHaveLength(0);
    });
  });
});