import { describe, expect, it } from "vitest";
import { compileReport, shippedSources, type CompileReport } from "./compilerSkips.testkit";

// The React Compiler bails out of a component it cannot prove safe WITHOUT a word: the component
// still works, it just re-renders everything under it on every render. The channel manager is where
// it hurt (the owner, 2026-10-03): Channels and DataTable both bailed out, every open, close and
// reposition of a row's right-click menu rebuilt the rows and columns, and on "All" rows the menu
// took ~0.9 s to open and ~0.6 s to close. An audit then found 95 such functions across src.
//
// A RATCHET over everything the build compiles. KNOWN_SKIPS is the exact set the compiler
// skips today, `file → function → the compiler's category`; everything else must compile. Both
// directions are red:
//   • a NEW skip (or a known one changing category) — fix the function; if it truly cannot be
//     compiled, adding it here is a decision for the owner, with the reason in docs/gates.md;
//   • a skip that is GONE — delete its entry, so the list only ever shrinks.
// A cleanup burned it down from 93 to the one function below: it read the popover engine through
// destructuring, moved every render-phase ref write to `useEffectEvent` / `useLatest`, took
// try/finally and every conditional, loop or optional call out of try blocks (the compiler cannot
// lower them yet — and `react-hooks/todo` does not see the latter, so THIS test is what catches them)
// and replaced the two exhaustive-deps suppressions, each of which skipped its whole function.
// VirtualGrid stays: TanStack Virtual's API cannot be memoized safely (IncompatibleLibrary).
const KNOWN_SKIPS: CompileReport["skipped"] = {
  "components/ui/VirtualGrid.tsx": { VirtualGrid: "IncompatibleLibrary" },
};

// The files a regression hurt most: compiled, and they must stay so (a positive check too, so a
// harness that compiled nothing could not pass as "no skips").
const MUST_COMPILE: Record<string, string[]> = {
  "components/Channels.tsx": ["Channels"],
  "components/ui/DataTable.tsx": ["DataTable"],
  // Under every button and every popover in the app.
  "components/ui/FocusSafeButton.tsx": ["FocusSafeButton"],
  "components/ui/anchoredPopoverHooks.ts": ["useAnchoredPopover"],
  "components/ui/AnchoredPopover.tsx": ["PopoverSurfaceInner"],
  // The two players — the largest components here, and the last to compile.
  "components/PlexPlayer.tsx": ["PlexPlayer"],
  "components/PlayerModal.tsx": ["PlayerModal"],
  "lib/playerModalHooks.ts": ["useYtProgress"],
};

type Row = [file: string, fn: string, category: string];
const rows = (skips: CompileReport["skipped"]): Row[] =>
  Object.entries(skips).flatMap(([file, fns]) =>
    Object.entries(fns).map(([fn, category]): Row => [file, fn, category]),
  );

describe("the React Compiler", () => {
  // ~8 s for the whole tree, once, shared by the checks below.
  const report = compileReport(shippedSources());
  const actual = rows(report.skipped);
  const known = rows(KNOWN_SKIPS);
  const key = ([f, fn]: Row) => `${f} → ${fn}`;

  it("skips nothing new (fix it, or the owner decides to list it)", () => {
    const knownAs = new Map(known.map((r) => [key(r), r[2]]));
    expect(
      actual.filter((r) => knownAs.get(key(r)) !== r[2]).map((r) => `${key(r)}: ${r[2]}`),
    ).toEqual([]);
  });

  it("lists no skip that has gone (delete it — the list only shrinks)", () => {
    const actualAs = new Map(actual.map((r) => [key(r), r[2]]));
    expect(known.filter((r) => !actualAs.has(key(r))).map(key)).toEqual([]);
  });

  it.each(Object.entries(MUST_COMPILE))("compiles %s", (file, fns) => {
    expect(report.skipped[file] ?? {}).toEqual({});
    for (const fn of fns) expect(report.compiled[file]).toContain(fn);
  });
});