import { describe, it, expect, beforeEach } from 'vitest';
import fs from 'node:fs/promises';
import path from 'node:path';
import os from 'node:os';
import { BlobStore } from '../../lib/ingest/blob_store.js';

let root, store;
beforeEach(async () => {
  root = await fs.mkdtemp(path.join(os.tmpdir(), 'void-blob-'));
  store = new BlobStore(root);
});

describe('blob_store', () => {
  it('hashes content and resolves a sharded path', async () => {
    const buf = Buffer.from('void');
    const sha = await store.hash(buf);
    expect(sha).toMatch(/^[0-9a-f]{64}$/);
    const p = store.path(sha);
    expect(p.startsWith(root)).toBe(true);
    expect(p.includes(sha.slice(0, 2))).toBe(true);
  });

  it('write is idempotent on identical content', async () => {
    const buf = Buffer.from('void');
    const a = await store.write(buf);
    const b = await store.write(buf);
    expect(a.path).toBe(b.path);
    expect(a.sha).toBe(b.sha);
    const onDisk = await fs.readFile(a.path);
    expect(onDisk.equals(buf)).toBe(true);
  });

  it('distinct content gets distinct paths', async () => {
    const a = await store.write(Buffer.from('void-one'));
    const b = await store.write(Buffer.from('void-two'));
    expect(a.path).not.toBe(b.path);
  });
});