import { readFileSync } from "node:fs";

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

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

// The layer-scale rule in eslint.config.js (DESIGN.md Tokens: "No ad-hoc z-index"). A numeric `z-10`
// happened to equal `base` and passed every review; a `no-restricted-syntax` selector that matches
// nothing looks exactly like a clean codebase, so pin that it fires.

async function refused(source: string): Promise<number> {
  const [result] = await eslint.lintText(source, { filePath: "src/components/__probe.tsx" });
  return (result?.messages ?? []).filter((m) => m.message.startsWith("z-index off the layer scale"))
    .length;
}

describe("a z-index off the layer scale", () => {
  // Assembled, so this file does not trip the very rule it probes.
  const z = (v: string) => `z-${v}`;

  it("is refused as a number, an arbitrary value or a variant, in a string and a template", async () => {
    expect(await refused(`export const a = "absolute ${z("10")} top-0";\n`)).toBe(1);
    expect(await refused(`export const b = "hover:${z("[5]")}";\n`)).toBe(1);
    expect(await refused("export const c = `x ${1} -" + z("20") + "`;\n")).toBe(1);
  });

  it("leaves a named level, z-0 and z-auto alone", async () => {
    expect(await refused(`export const d = "${z("base")} ${z("menu")} ${z("tooltip")}";\n`)).toBe(
      0,
    );
    expect(await refused(`export const e = "${z("0")} md:${z("auto")}";\n`)).toBe(0);
  });
});

// The Plex player's notices (the track-switch OSD, the subtitle notice) sat on `menu` while its settings
// and tracks popovers had no level: a notice drew over the open menu (E28 audit, seen live). A menu is
// above a notice; the info overlay (`menu`, later in the tree) still covers both.
describe("the Plex player's layers", () => {
  const src = ["PlexPlayer.tsx", "PlexPlayerSettings.tsx"]
    .map((f) => readFileSync(new URL(`../components/${f}`, import.meta.url), "utf8"))
    .join("\n");
  const classes = (marker: RegExp) =>
    [...src.matchAll(/className="([^"]*)"/g)].map((m) => m[1]!).filter((c) => marker.test(c));

  it("puts every popover on the menu level", () => {
    const popovers = classes(
      /\bbottom-full\b.*\bbg-media-chrome\b|\bbg-media-chrome\b.*\bbottom-full\b/,
    );
    expect(popovers).toHaveLength(2);
    for (const c of popovers) expect(c).toMatch(/\bz-menu\b/);
  });

  it("keeps the notices a level below", () => {
    const notices = classes(/pointer-events-none absolute inset-x-0 bottom-(24|36)\b/);
    expect(notices).toHaveLength(2);
    for (const c of notices) expect(c).toMatch(/\bz-base\b/);
  });
});