import { readdirSync } from "node:fs";
import { fileURLToPath } from "node:url";

import { ESLint } from "eslint";
import { beforeAll } from "vitest";

// The one ESLint the lint-rule contract tests probe with (`*.contract.test.ts` that pin a selector in
// eslint.config.js). Its first lint loads the whole config and every plugin: ~1.5 s warm, measured at
// 8 s cold, past vitest's 5 s per test, so the first probe of a file timed out once. The
// hook below pays that cost once per test file, under its own budget; importing this registers it.
const FRONTEND = fileURLToPath(new URL("../../", import.meta.url));

// The probes lint TEXT under file names that do not exist (`__probe.tsx`, `x.ts`, a feature-folder
// `Button.tsx`). The src config runs type-aware rules, whose project service refuses a
// file no tsconfig includes, so those names are let into TypeScript's default project here — the
// probe still runs the real config, typed rules included, rather than a copy with them switched off.
const PROBE_FILES = [
  "src/*/__*probe.ts",
  "src/*/__*probe.tsx",
  "src/components/ui/__*probe.tsx",
  "src/lib/api/__*probe.ts",
  "src/components/Button.tsx",
  "src/lib/x.ts",
];

export const eslint = new ESLint({
  cwd: FRONTEND,
  overrideConfig: {
    files: ["src/**/*.{ts,tsx}"],
    languageOptions: {
      parserOptions: {
        projectService: { allowDefaultProject: PROBE_FILES, defaultProject: "tsconfig.json" },
        tsconfigRootDir: FRONTEND,
      },
    },
  },
});

/** Every component file in ui/, by name — for a probe that pins which of them a rule exempts. */
export const uiFiles = (): string[] =>
  readdirSync(new URL("../components/ui/", import.meta.url))
    .filter((f) => f.endsWith(".tsx") && !f.includes(".test."))
    .sort();

beforeAll(async () => {
  await eslint.lintText("", { filePath: "src/components/__probe.tsx" });
}, 60_000);