import assert from 'node:assert/strict';
import test from 'node:test';
import { createInMemoryExecutorJobStore } from './executor-gateway.mjs';
import { createExecutorWorkerCoordinator } from './executor-worker-protocol.mjs';

function queuedJob(overrides = {}) {
  return {
    version: 'executor-job-state-v1',
    jobId: 'job-1',
    idempotencyKey: 'idem-1',
    requestFingerprint: 'a'.repeat(64),
    executor: 'goosed',
    status: 'queued',
    attempts: 0,
    maxAttempts: 2,
    createdAt: 1000,
    updatedAt: 1000,
    completedAt: null,
    ...overrides,
  };
}

async function seed(store, job = queuedJob()) {
  await store.createIfAbsent(job);
}

test('worker claims, starts, heartbeats and completes a queued job with lease fencing', async () => {
  let now = 1000;
  let token = 0;
  const store = createInMemoryExecutorJobStore();
  await seed(store);
  const coordinator = createExecutorWorkerCoordinator({
    store,
    nowMs: () => now,
    randomUUID: () => `lease-${++token}`,
  });

  const claimed = await coordinator.claim({
    workerId: 'worker-1',
    executors: ['goosed'],
    leaseDurationMs: 5000,
  });
  assert.equal(claimed.version, 'executor-worker-v1');
  assert.equal(claimed.leaseToken, 'lease-1');
  assert.equal(claimed.job.status, 'leased');
  assert.equal(claimed.job.attempts, 1);
  assert.equal(await coordinator.claim({
    workerId: 'worker-2',
    executors: ['goosed'],
  }), null);

  await assert.rejects(
    coordinator.start('job-1', { leaseToken: 'wrong-token' }),
    (error) => error.code === 'EXECUTOR_LEASE_LOST',
  );
  const started = await coordinator.start('job-1', { leaseToken: 'lease-1' });
  assert.equal(started.status, 'running');
  assert.equal(started.startedAt, 1000);

  now = 3000;
  const heartbeat = await coordinator.heartbeat('job-1', {
    leaseToken: 'lease-1',
    leaseDurationMs: 5000,
  });
  assert.equal(heartbeat.lease.heartbeatAt, 3000);
  assert.equal(heartbeat.lease.expiresAt, 8000);

  await coordinator.progress('job-1', {
    leaseToken: 'lease-1',
    type: 'executor_job_output_chunk',
    data: { characters: 12 },
  });
  now = 4000;
  const completed = await coordinator.complete('job-1', {
    leaseToken: 'lease-1',
    result: {
      summary: 'done',
      artifactRefs: [{ kind: 'patch', id: 'artifact-1' }],
    },
  });
  assert.equal(completed.status, 'succeeded');
  assert.equal(completed.lease, null);
  assert.deepEqual(completed.result.artifactRefs, [{ kind: 'patch', id: 'artifact-1' }]);
  assert.deepEqual(
    (await store.listEvents('job-1')).map((event) => event.type),
    [
      'executor_job_leased',
      'executor_job_started',
      'executor_job_heartbeat',
      'executor_job_output_chunk',
      'executor_job_succeeded',
    ],
  );
});

test('retryable failure is delayed and a later terminal failure consumes max attempts', async () => {
  let now = 1000;
  let token = 0;
  const store = createInMemoryExecutorJobStore();
  await seed(store);
  const coordinator = createExecutorWorkerCoordinator({
    store,
    nowMs: () => now,
    randomUUID: () => `lease-${++token}`,
  });

  const first = await coordinator.claim({ workerId: 'worker-1', executors: ['goosed'] });
  await coordinator.start('job-1', { leaseToken: first.leaseToken });
  const retryable = await coordinator.fail('job-1', {
    leaseToken: first.leaseToken,
    error: { code: 'UPSTREAM_BUSY', message: 'busy', retryable: true },
    retryDelayMs: 5000,
  });
  assert.equal(retryable.status, 'retryable');
  assert.equal(retryable.nextAttemptAt, 6000);
  assert.equal(await coordinator.claim({
    workerId: 'worker-2',
    executors: ['goosed'],
  }), null);

  now = 6000;
  const second = await coordinator.claim({ workerId: 'worker-2', executors: ['goosed'] });
  assert.equal(second.job.attempts, 2);
  await coordinator.start('job-1', { leaseToken: second.leaseToken });
  const failed = await coordinator.fail('job-1', {
    leaseToken: second.leaseToken,
    error: { code: 'UPSTREAM_BUSY', message: 'still busy', retryable: true },
  });
  assert.equal(failed.status, 'failed');
  assert.equal(failed.completedAt, 6000);
});

test('expired leases are recovered with fencing and eventually time out', async () => {
  let now = 1000;
  let token = 0;
  const store = createInMemoryExecutorJobStore();
  await seed(store, queuedJob({ maxAttempts: 1 }));
  const coordinator = createExecutorWorkerCoordinator({
    store,
    nowMs: () => now,
    randomUUID: () => `lease-${++token}`,
  });
  const claimed = await coordinator.claim({
    workerId: 'worker-crashed',
    executors: ['goosed'],
    leaseDurationMs: 5000,
  });
  await coordinator.start('job-1', { leaseToken: claimed.leaseToken });
  now = 6001;
  const recovery = await coordinator.recoverExpired();
  assert.equal(recovery.inspected, 1);
  assert.equal(recovery.recovered[0].status, 'timed_out');
  await assert.rejects(
    coordinator.heartbeat('job-1', { leaseToken: claimed.leaseToken }),
    (error) => error.code === 'EXECUTOR_JOB_STATE_CONFLICT',
  );
  const stats = await coordinator.stats();
  assert.equal(stats.counts.timed_out, 1);
  assert.equal(stats.expiredLeases, 0);
});

test('worker protocol bounds identifiers and progress payloads', async () => {
  const store = createInMemoryExecutorJobStore();
  await seed(store);
  const coordinator = createExecutorWorkerCoordinator({
    store,
    randomUUID: () => 'lease-1',
  });
  await assert.rejects(
    coordinator.claim({ workerId: '../worker', executors: ['goosed'] }),
    (error) => error.code === 'EXECUTOR_WORKER_ID_INVALID',
  );
  const claimed = await coordinator.claim({ workerId: 'worker-1', executors: ['goosed'] });
  await assert.rejects(
    coordinator.progress('job-1', {
      leaseToken: claimed.leaseToken,
      data: { output: 'x'.repeat(20_000) },
    }),
    (error) => error.code === 'EXECUTOR_EVENT_DATA_TOO_LARGE',
  );
});