import { describe, expect, it } from "vitest";

import { eslint } from "./lintProbe.testkit";

// eslint.config.js: a bare `fetchNextPage()` cancels the page already loading and sends it again.
// Pins that the rule keeping every call on NEXT_PAGE actually fires.
const MESSAGE = "fetchNextPage() cancels";

async function hits(source: string): Promise<number> {
  const [result] = await eslint.lintText(source, { filePath: "src/components/__probe.tsx" });
  return (result?.messages ?? []).filter((m) => m.message.startsWith(MESSAGE)).length;
}

describe("a next-page fetch", () => {
  it("is refused bare, on the query or destructured", async () => {
    expect(
      await hits("export const a = (q: { fetchNextPage(): void }) => q.fetchNextPage();\n"),
    ).toBe(1);
    expect(await hits("export const b = (fetchNextPage: () => void) => fetchNextPage();\n")).toBe(
      1,
    );
  });

  it("passes with NEXT_PAGE", async () => {
    expect(
      await hits(
        'import { NEXT_PAGE } from "../lib/nextPage";\nexport const c = (q: { fetchNextPage(o: unknown): void }) => q.fetchNextPage(NEXT_PAGE);\n',
      ),
    ).toBe(0);
  });
});