import { execFile } from "node:child_process";
import { promisify } from "node:util";

import { expect, it } from "vitest";

it("retains completed worker facts when cancellation arrives during final job cleanup", async () => {
  const loaderUrl = new URL(
    "../../../scripts/lib/verifier-source-loader.mjs",
    import.meta.url,
  ).href;
  const workerUrl = new URL(
    "../../../src/javascript/analysis/JavaScriptAnalysisWorker.ts",
    import.meta.url,
  ).href;
  const processUrl = new URL(
    "../../../src/process/ProviderProcess.ts",
    import.meta.url,
  ).href;
  // Isolate the filesystem seam in a Node process. Both analyses use the real
  // analyzer and remove their actual files before the cancellation is delivered.
  const script = `
    import fs from 'node:fs';
    import { createHash } from 'node:crypto';
    import { syncBuiltinESMExports } from 'node:module';
    const { importVerifierSource } = await import(${JSON.stringify(loaderUrl)});
    const controller = new AbortController();
    const reason = new Error('cancel during final worker cleanup');
    const nativeRm = fs.promises.rm;
    let cancelOnCleanup = false;
    let completedRemovals = 0;
    fs.promises.rm = async (path, options) => {
      await nativeRm(path, options);
      if (String(path).includes('rea-javascript-analysis-') && String(path).endsWith('.records')) {
        completedRemovals += 1;
        if (cancelOnCleanup) controller.abort(reason);
      }
    };
    syncBuiltinESMExports();
    const { JavaScriptAnalysisWorker } = await importVerifierSource(new URL(${JSON.stringify(workerUrl)}));
    const { spawnOwnedProviderProcess } = await importVerifierSource(new URL(${JSON.stringify(processUrl)}));
    const value = 'export const observed = 7;';
    const source = path => ({ path, sha256: createHash('sha256').update(value).digest('hex'),
      container_sha256: '1'.repeat(64), bytes: Buffer.byteLength(value), inventory_artifact_id: 'fixture-source',
      kind: 'javascript', unpacked: false, text: { included: true, value } });
    let root;
    let child;
    let launches = 0;
    const worker = new JavaScriptAnalysisWorker({ heapMb: 128, timeoutMs: 5000 }, async request => {
      root = request.cwd;
      const spawned = await spawnOwnedProviderProcess(request);
      child = spawned.process;
      launches += 1;
      return spawned;
    });
    let observed;
    try {
      const control = await worker.analyze(source('control.mjs'), { nodes: 100, unknowns: 100 });
      const controlReusable = worker.canReuse();
      cancelOnCleanup = true;
      const cancelled = await worker.analyze(source('cancelled.mjs'), { nodes: 100, unknowns: 100 }, controller.signal);
      const facts = cancelled.ok ? cancelled.value : cancelled.error;
      observed = { controlOk: control.ok, controlReusable, completedRemovals, launches,
        cancelled: !cancelled.ok && cancelled.error.error._tag === 'AnalysisCancelledError',
        exactReason: !cancelled.ok && cancelled.error.error.cause === reason,
        parseStatus: facts.javascript?.parse_status, hasModule: facts.module !== null,
        hasProjection: facts.projection !== null, reusable: worker.canReuse() };
    } finally {
      fs.promises.rm = nativeRm;
      syncBuiltinESMExports();
      await worker.close();
    }
    const rootRemoved = await fs.promises.stat(root).then(() => false, cause => {
      if (cause.code !== 'ENOENT') throw cause;
      return true;
    });
    process.stdout.write(JSON.stringify({ ...observed, rootRemoved,
      childExited: child.exitCode !== null || child.signalCode !== null }));
  `;
  const { stdout } = await promisify(execFile)(
    process.execPath,
    ["--input-type=module", "--eval", script],
    { timeout: 20_000 },
  );
  const observed: unknown = JSON.parse(stdout);
  expect(observed).toEqual({
    controlOk: true,
    controlReusable: true,
    completedRemovals: 2,
    launches: 1,
    cancelled: true,
    exactReason: true,
    parseStatus: "complete",
    hasModule: true,
    hasProjection: true,
    reusable: false,
    rootRemoved: true,
    childExited: true,
  });
});