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import {expect} from '@esm-bundle/chai';import {SinonFakeTimers, useFakeTimers} from 'sinon';import {assert} from '../asserts';import type {Node} from '../btree/node';import * as dag from '../dag/mod';import * as sync from '../sync/mod';import * as db from '../db/mod';import {  addGenesis,  addIndexChange,  addLocal,  addSnapshot,  Chain,} from '../db/test-helpers';import {  assertHash,  assertNotTempHash,  Hash,  isTempHash,  makeNewFakeHashFunction,} from '../hash';import type {Value} from '../kv/store';import type {ClientID} from '../sync/client-id';import {getClient, ClientStateNotFoundError} from './clients';import {addSyncSnapshot} from '../sync/test-helpers';import {persist} from './persist';import {gcClients} from './client-gc.js';import {initClientWithClientID} from './clients-test-helpers.js';
let clock: SinonFakeTimers;setup(() => {  clock = useFakeTimers(123456789);});
teardown(() => {  clock.restore();});
async function assertSameDagData(  clientID: ClientID,  memdag: dag.TestStore,  perdag: dag.TestStore,): Promise<void> {  const memdagHeadHash = await memdag.withRead(async dagRead => {    const headHash = await dagRead.getHead(db.DEFAULT_HEAD_NAME);    expect(isTempHash(headHash)).to.be.false;    return headHash;  });  const perdagClientHash = await perdag.withRead(async dagRead => {    const client = await getClient(clientID, dagRead);    assert(client);    return client.headHash;  });  expect(memdagHeadHash).to.equal(perdagClientHash);  assertHash(memdagHeadHash);
  const memSnapshot = await getChunkSnapshot(memdag, memdagHeadHash);  const perSnapshot = await getChunkSnapshot(perdag, perdagClientHash);
  expect(memSnapshot).to.deep.equal(perSnapshot);}async function assertClientMutationIDsCorrect(  clientID: ClientID,  perdag: dag.TestStore,): Promise<void> {  await perdag.withRead(async dagRead => {    const client = await getClient(clientID, dagRead);    assert(client);    const headCommit = await db.commitFromHash(client.headHash, dagRead);    const baseSnapshotCommit = await db.baseSnapshot(client.headHash, dagRead);    expect(client.mutationID).to.equal(headCommit.mutationID);    expect(client.lastServerAckdMutationID).to.equal(      baseSnapshotCommit.meta.lastMutationID,    );  });}
class ChunkSnapshotVisitor extends db.Visitor {  snapshot: Record<string, Value> = {};
  override visitCommitChunk(    chunk: dag.Chunk<db.CommitData<db.Meta>>,  ): Promise<void> {    this.snapshot[chunk.hash.toString()] = chunk.data;    return super.visitCommitChunk(chunk);  }
  override visitBTreeNodeChunk(chunk: dag.Chunk<Node>): Promise<void> {    this.snapshot[chunk.hash.toString()] = chunk.data;    return super.visitBTreeNodeChunk(chunk);  }}
async function getChunkSnapshot(  dagStore: dag.Store,  hash: Hash,): Promise<Record<string, Value>> {  return dagStore.withRead(async dagRead => {    const v = new ChunkSnapshotVisitor(dagRead);    await v.visitCommit(hash);    return v.snapshot;  });}
suite('persist on top of different kinds of commits', () => {  const {memdag, perdag, chain, testPersist, clientID} = setupPersistTest();
  setup(async () => {    memdag.clear();    perdag.clear();    chain.length = 0;    await initClientWithClientID(clientID, perdag);    await addGenesis(chain, memdag);  });
  teardown(async () => {    await testPersist();  });
  test('Genesis only', async () => {    // all the required work is done in setup/teardown.  });
  test('local', async () => {    await addLocal(chain, memdag);  });
  test('snapshot', async () => {    await addSnapshot(chain, memdag, [      ['a', 0],      ['b', 1],      ['c', 2],    ]);  });
  test('local + syncSnapshot', async () => {    await addLocal(chain, memdag);    await addSyncSnapshot(chain, memdag, 1);  });
  test('local + local', async () => {    await addLocal(chain, memdag);    await addLocal(chain, memdag);  });
  test('local on to of a persisted local', async () => {    await addLocal(chain, memdag);    await testPersist();    await addLocal(chain, memdag);  });
  test('local * 3', async () => {    await addLocal(chain, memdag);    await addLocal(chain, memdag);    await addLocal(chain, memdag);  });
  test('local + snapshot', async () => {    await addLocal(chain, memdag);    await addSnapshot(chain, memdag, [['changed', 3]]);  });
  test('local + snapshot + local', async () => {    await addLocal(chain, memdag);    await addSnapshot(chain, memdag, [['changed', 4]]);    await addLocal(chain, memdag);  });
  test('local + snapshot + local + syncSnapshot', async () => {    await addLocal(chain, memdag);    await addSnapshot(chain, memdag, [['changed', 5]]);    await addLocal(chain, memdag);    await addSyncSnapshot(chain, memdag, 3);
    const syncHeadCommitBefore = await memdag.withRead(async dagRead => {      const h = await dagRead.getHead(sync.SYNC_HEAD_NAME);      assert(h);      return db.commitFromHash(h, dagRead);    });
    expect(      isTempHash(        (syncHeadCommitBefore.chunk.data as db.CommitData<db.SnapshotMeta>)          .valueHash,      ),    ).to.be.true;    await testPersist();
    const syncHeadCommitAfter = await memdag.withRead(async dagRead => {      const h = await dagRead.getHead(sync.SYNC_HEAD_NAME);      assert(h);      return db.commitFromHash(h, dagRead);    });
    expect(syncHeadCommitBefore.chunk.hash).to.not.equal(      syncHeadCommitAfter.chunk.hash,    );
    expect(      isTempHash(        (syncHeadCommitAfter.chunk.data as db.CommitData<db.SnapshotMeta>)          .valueHash,      ),    ).to.be.false;  });
  test('local + indexChange', async () => {    await addLocal(chain, memdag);    await addIndexChange(chain, memdag);  });});
test('We get a MissingClientException during persist if client is missing', async () => {  const {memdag, perdag, chain, testPersist, clientID} = setupPersistTest();  await initClientWithClientID(clientID, perdag);
  await addGenesis(chain, memdag);  await addLocal(chain, memdag);  await testPersist();
  await addLocal(chain, memdag);
  await clock.tickAsync(14 * 24 * 60 * 60 * 1000);
  // Remove the client from the clients map.  await gcClients('dummy', perdag);
  let err;  try {    await persist(clientID, memdag, perdag);  } catch (e) {    err = e;  }  expect(err)    .to.be.an.instanceof(ClientStateNotFoundError)    .property('id', clientID);});
function setupPersistTest() {  const memdag = new dag.TestStore(    undefined,    makeNewFakeHashFunction('t/memdag'),    assertHash,  );  const perdag = new dag.TestStore(    undefined,    makeNewFakeHashFunction('perdag'),    assertNotTempHash,  );
  const clientID = 'client-id';  const chain: Chain = [];
  const testPersist = async () => {    await persist(clientID, memdag, perdag);    await assertSameDagData(clientID, memdag, perdag);    await assertClientMutationIDsCorrect(clientID, perdag);  };  return {memdag, perdag, chain, testPersist, clientID};}