import { execFileSync } from "node:child_process";
import fs from "node:fs";
import os from "node:os";
import path from "node:path";
import { afterEach, describe, expect, it } from "vitest";

const root = process.cwd();
const verifierPath = path.join(root, "scripts/verify-first-approved-small-feature-cut.mjs");
let fixtureRoot;

function writeFixtureFile(relativePath, content = "") {
  const filePath = path.join(fixtureRoot, relativePath);
  fs.mkdirSync(path.dirname(filePath), { recursive: true });
  fs.writeFileSync(filePath, content);
}

function createPassingFixture() {
  fixtureRoot = fs.mkdtempSync(path.join(os.tmpdir(), "first-approved-small-feature-cut-"));
  writeFixtureFile("apps/web/app/routes/index.tsx", "export default function Index() { return null; }\n");
  writeFixtureFile("apps/web/app/modules/blog/README.md", "Blog runtime has been removed.\n");
  writeFixtureFile("docs/feature-inventory.md", "Feature Decision/S06 BlogApi remove-from-core note: the orphan Blog API stub is removed.\n");
  writeFixtureFile("docs/feature-manifests/remove-candidates.json", JSON.stringify({ notes: ["Feature Decision/S06 BlogApi remove-from-core note: orphan API stub removed."] }, null, 2));
  return fixtureRoot;
}

function runVerifier(targetRoot = fixtureRoot) {
  return execFileSync(process.execPath, [verifierPath, targetRoot], {
    cwd: root,
    encoding: "utf8",
    stdio: ["ignore", "pipe", "pipe"],
  });
}

describe("verify-first-approved-small-feature-cut", () => {
  afterEach(() => {
    if (fixtureRoot) {
      fs.rmSync(fixtureRoot, { recursive: true, force: true });
      fixtureRoot = undefined;
    }
  });

  it("passes for a fixture with the BlogApi cut applied and documented", () => {
    createPassingFixture();

    expect(runVerifier()).toContain("PASS first approved small feature cut verification");
  });

  it("fails when the removed BlogApi.ts file exists", () => {
    createPassingFixture();
    writeFixtureFile("apps/web/app/utils/api/.server/BlogApi.ts", "export class BlogApi {}\n");

    expect(() => runVerifier()).toThrow(/removed Blog API file still exists: apps\/web\/app\/utils\/api\/\.server\/BlogApi\.ts/);
  });

  it("fails when an app source file imports the blog module", () => {
    createPassingFixture();
    writeFixtureFile("apps/web/app/routes/stale.tsx", "import { loader } from \"~\/modules\/blog\";\nexport { loader };\n");

    expect(() => runVerifier()).toThrow(/stale Blog source reference: apps\/web\/app\/routes\/stale\.tsx:1 references ~\/modules\/blog/);
  });
});