import { lstat, mkdir, mkdtemp, rm, symlink, writeFile } from 'node:fs/promises';
import { tmpdir } from 'node:os';
import { join } from 'node:path';
import { afterEach, describe, expect, it } from 'vitest';
import {
  assertPreparedAssetDirectoryIdentity,
  materializeEmptyAssetSet,
} from '../../scripts/materialize-empty-asset-set.mjs';

const temporaryRoots = [];

const createScratchRepository = async () => {
  const root = await mkdtemp(join(tmpdir(), 'portfolio-empty-assets-'));
  temporaryRoots.push(root);
  await mkdir(join(root, 'content/public'), { recursive: true });
  await writeFile(join(root, 'content/public/asset-manifest.json'), '{"assets":[]}');
  return root;
};

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

describe('empty asset materialization', () => {
  it('creates an empty prepared-asset directory in the supplied repository root', async () => {
    const root = await createScratchRepository();
    await materializeEmptyAssetSet(root);
    expect((await lstat(join(root, 'inputs/prepared-assets'))).isDirectory()).toBe(true);
  });

  it('rejects a symbolic-link prepared-asset directory', async () => {
    const root = await createScratchRepository();
    const target = join(root, 'outside');
    await mkdir(target);
    await mkdir(join(root, 'inputs'), { recursive: true });
    await symlink(target, join(root, 'inputs/prepared-assets'));
    await expect(materializeEmptyAssetSet(root)).rejects.toThrow(/non-symlink directory/i);
  });

  it('rejects unexpected prepared-asset members in its supplied repository root', async () => {
    const root = await createScratchRepository();
    const preparedAssetsPath = join(root, 'inputs/prepared-assets');
    await mkdir(preparedAssetsPath, { recursive: true });
    await writeFile(join(preparedAssetsPath, 'unexpected.webp'), 'not an asset');
    await expect(materializeEmptyAssetSet(root)).rejects.toThrow(/must be empty/i);
  });

  it('rejects a prepared-asset directory replaced after its identity was captured', async () => {
    const root = await createScratchRepository();
    const preparedAssetsPath = join(root, 'inputs/prepared-assets');
    await mkdir(preparedAssetsPath, { recursive: true });
    const original = await lstat(preparedAssetsPath);
    await rm(preparedAssetsPath, { recursive: true });
    await mkdir(preparedAssetsPath);
    await expect(assertPreparedAssetDirectoryIdentity(preparedAssetsPath, original))
      .rejects.toThrow(/identity changed/i);
  });
});