import { spawnSync } from "node:child_process";
import {
  cp,
  mkdir,
  readFile,
  readdir,
  rm,
  symlink,
  writeFile,
} from "node:fs/promises";
import path from "node:path";

const fixtureRoot = path.resolve(".tmp/reference-feature-removal");
const pnpmCli = /** @type {string} */ (process.env.npm_execpath);
const featureSource = "src/features/reference-feature";
const featureTests = "tests/features/reference-feature";
const featureOwnedPaths = [
  featureSource,
  featureTests,
  "tests/e2e/reference-form.spec.js",
  "tests/e2e/reference-route.spec.js",
  "tests/mocks",
];
const copyTargets = [
  "src",
  "tests",
  "recipes",
  "scripts",
  "config",
  "public",
  "index.html",
  "package.json",
  "tsconfig.base.json",
  "tsconfig.json",
  "tsconfig.app.json",
  "tsconfig.node.json",
  "tsconfig.test.json",
  "tsconfig.recipes.json",
  "vite.config.js",
  "vitest.config.js",
  "playwright.config.js",
  "eslint.config.js",
  ".dependency-cruiser.cjs",
];

const emptyContracts = `import { PLATFORM_ROUTE_RUNTIME_CONTRACT } from "../contracts/route-runtime-contract.js";
import { PLATFORM_ROUTE_REGISTRY } from "../contracts/routes.js";
import { PLATFORM_SCHEMA_REGISTRY } from "../contracts/schema-registry.js";

export const INSTALLED_FEATURE_CONTRACTS =
  /** @type {readonly unknown[]} */ (Object.freeze([]));
export const ROUTE_REGISTRY = PLATFORM_ROUTE_REGISTRY;
export const ROUTE_RUNTIME_CONTRACT = PLATFORM_ROUTE_RUNTIME_CONTRACT;
export const API_OPERATIONS = Object.freeze({});
export const QUERY_REGISTRY = Object.freeze({});
export const SCHEMA_REGISTRY = PLATFORM_SCHEMA_REGISTRY;
export const NAVIGATION_ROUTES = Object.freeze(
  Object.values(ROUTE_REGISTRY)
    .filter((definition) => definition.navigationOrder !== null)
    .sort(
      (left, right) =>
        /** @type {number} */ (left.navigationOrder) -
        /** @type {number} */ (right.navigationOrder),
    ),
);
/** @param {string} routeId */
export function getRoute(routeId) {
  const registry =
    /** @type {Readonly<Record<string, import("../contracts/routes.js").RouteDefinition>>} */ (
      ROUTE_REGISTRY
    );
  const selected = registry[routeId];
  if (!selected) throw new Error(\`Unregistered route: \${routeId}\`);
  return selected;
}
/** @param {string} routeId */
export function routePath(routeId) {
  return getRoute(routeId).path;
}
`;

const emptyRuntimes = `import { PLATFORM_ROUTE_CODECS } from "../presentation/routes/platform-route-codecs.js";
import { PLATFORM_ROUTE_RUNTIME } from "../presentation/routes/route-runtime.js";

export const ROUTE_CODECS = PLATFORM_ROUTE_CODECS;
export const ROUTE_RUNTIME = PLATFORM_ROUTE_RUNTIME;
`;

const emptyAdapters = `type FeatureContext = Readonly<{
  createHttpClient(contract: Readonly<Record<string, unknown>>): unknown;
}>;
export function createInstalledFeatureInputs(_context: FeatureContext) {
  void _context;
  return Object.freeze({});
}
`;

const emptyMessages = `export const INSTALLED_MESSAGE_CATALOGS = Object.freeze({
  "ko-KR": Object.freeze({}),
  "en-US": Object.freeze({}),
});
`;

/** @param {string} directory @returns {Promise<string[]>} */
async function filesBelow(directory) {
  const entries = await readdir(directory, { withFileTypes: true });
  const groups = await Promise.all(
    entries.map((entry) => {
      const target = path.join(directory, entry.name);
      return entry.isDirectory() ? filesBelow(target) : [target];
    }),
  );
  return groups.flat();
}

/** @param {string} script @param {string[]} [extra] */
function runPnpm(script, extra = []) {
  const result = spawnSync(process.execPath, [pnpmCli, script, ...extra], {
    cwd: fixtureRoot,
    stdio: "inherit",
  });
  return result.status === 0;
}

await rm(fixtureRoot, { recursive: true, force: true });
await mkdir(fixtureRoot, { recursive: true });
for (const target of copyTargets) {
  await cp(target, path.join(fixtureRoot, target), { recursive: true });
}
await symlink(path.resolve("node_modules"), path.join(fixtureRoot, "node_modules"), "dir");

for (const ownedPath of featureOwnedPaths) {
  await rm(path.join(fixtureRoot, ownedPath), {
    recursive: true,
    force: true,
  });
}
await writeFile(
  path.join(fixtureRoot, "src/features/installed-feature-contracts.js"),
  emptyContracts,
);
await writeFile(
  path.join(fixtureRoot, "src/features/installed-feature-runtimes.tsx"),
  emptyRuntimes,
);
await writeFile(
  path.join(fixtureRoot, "src/features/installed-feature-adapters.ts"),
  emptyAdapters,
);
await writeFile(
  path.join(fixtureRoot, "src/features/installed-feature-messages.js"),
  emptyMessages,
);
const governanceFile = path.join(
  fixtureRoot,
  "config/contracts/registry-governance.json",
);
const removalGovernance = JSON.parse(await readFile(governanceFile, "utf8"));
removalGovernance.registries = removalGovernance.registries.map(
  /** @param {Record<string, unknown>} registry */
  (registry) => ({
    ...registry,
    ...(Array.isArray(registry.consumers)
      ? {
          consumers: registry.consumers.filter(
            /** @param {{path?: string}} consumer */
            (consumer) =>
              !consumer.path?.includes("features/reference-feature"),
          ),
        }
      : {}),
    ...(Array.isArray(registry.consumerDirectories)
      ? {
          consumerDirectories: registry.consumerDirectories.filter(
            /** @param {string} directory */
            (directory) =>
              !directory.includes("features/reference-feature"),
          ),
        }
      : {}),
  }),
);
await writeFile(
  governanceFile,
  `${JSON.stringify(removalGovernance, null, 2)}\n`,
);

/** @type {string[]} */
const residue = [];
for (const root of ["src", "tests"]) {
  for (const file of await filesBelow(path.join(fixtureRoot, root))) {
    const relative = path.relative(fixtureRoot, file);
    const content = await readFile(file, "utf8");
    if (
      /REFERENCE_RESOURCE|reference-feature|reference-resource/i.test(
        `${relative}\n${content}`,
      )
    ) {
      residue.push(relative);
    }
  }
}

const checks = [
  ["typecheck", runPnpm("check:types")],
  ["architecture", runPnpm("check:architecture")],
  ["registry-structure", runPnpm("check:registries:structure")],
  ["unit-integration", runPnpm("test:all")],
  [
    "home-smoke",
    runPnpm("exec", [
      "vitest",
      "run",
      "tests/component/router.test.jsx",
      "--reporter=default",
    ]),
  ],
  ["build", runPnpm("build")],
];
/** @type {string[]} */
const builtResidue = [];
for (const file of await filesBelow(path.join(fixtureRoot, "dist"))) {
  if (!/\.(?:js|css|html|json)$/.test(file)) continue;
  const content = await readFile(file, "utf8");
  if (
    /REFERENCE_RESOURCE|reference-feature|reference-resource/i.test(content)
  ) {
    builtResidue.push(path.relative(fixtureRoot, file));
  }
}
const routeCatalog = await import(
  `${new URL(
    "../src/features/installed-feature-contracts.js",
    `file://${fixtureRoot}/scripts/`,
  ).href}?removed=${Date.now()}`
);
const routeIds = Object.keys(routeCatalog.ROUTE_REGISTRY);
const routeAbsent = routeIds.every((routeId) => !routeId.startsWith("REFERENCE_"));
checks.push(["route-absent", routeAbsent]);
checks.push(["fixture-id-residue", residue.length === 0]);
checks.push(["built-fixture-id-residue", builtResidue.length === 0]);

const passed = checks.every(([, result]) => result);
await mkdir("artifacts/tests", { recursive: true });
await writeFile(
  "artifacts/tests/sample-removal.xml",
  `<?xml version="1.0" encoding="UTF-8"?>\n` +
    `<testsuite name="reference-feature-removal" tests="${checks.length}" failures="${passed ? 0 : 1}">` +
    checks
      .map(
        ([name, result]) =>
          `<testcase name="${name}">${result ? "" : `<failure>${[...residue, ...builtResidue].join(", ")}</failure>`}</testcase>`,
      )
      .join("") +
    `</testsuite>\n`,
);
await rm(fixtureRoot, { recursive: true, force: true });

if (!passed) {
  const failures = checks
    .filter(([, result]) => !result)
    .map(([name]) => name);
  process.stderr.write(
    `Reference feature removal failed: ${failures.join(", ")}; residue: ${[...residue, ...builtResidue].join(", ")}\n`,
  );
  process.exit(1);
}
process.stdout.write(
  `Reference feature removal: PASS (${checks.length} checks, no fixture IDs)\n`,
);