import assert from "node:assert/strict";
import test from "node:test";
import { StrictMode, startTransition, useEffect, useState, type ReactNode } from "react";

import { SidebarInset, SidebarProvider } from "../src/components/ui/sidebar.tsx";
import { useHomeShellRegistration } from "../src/hooks/use-home-shell-registration.ts";
import * as sessionList from "../src/lib/session-list-context.tsx";
import { emptyProfile, type Account, type ChatSession } from "../src/lib/home-types.ts";
import { createClientLifecycleHarness } from "./react-client-lifecycle-test-support.ts";

const account: Account = {
  user: { id: "11111111-1111-4111-8111-111111111111", email: null },
  profile: { ...emptyProfile, name: "Synthetic" },
  avatar: null, credits: 10, isAdmin: false, adminUrl: null,
  rectificationPriceCredits: 0, activeSubscription: null,
  hasConfirmedBirthTime: false, hasUsableBirthTime: false,
};
const row: ChatSession = {
  id: "22222222-2222-4222-8222-222222222222", title: "Synthetic session", theme: "general",
  modelId: "test", messages: [], createdAt: 1, updatedAt: 1,
  sessionType: "consultation", rectificationCaseId: null, chartProfileId: null,
  chartProfileName: null, chartProfileRole: null, pinned: false, archivedAt: null,
  messagesHydrated: false,
};
const noop = () => {};
const trigger = { current: null };
const charts: never[] = [];

async function fixture(options: { strict?: boolean; unauthorized?: boolean } = {}) {
  const harness = createClientLifecycleHarness();
  const originalFetch = globalThis.fetch;
  const requests: string[] = [];
  globalThis.fetch = (async (input) => {
    const url = String(input);
    requests.push(url);
    assert.ok(url === "/api/account" || url.startsWith("/api/sessions?"), `unexpected fetch ${url}`);
    return new Response(JSON.stringify(url === "/api/account" ? account : { sessions: [], nextCursor: null }), {
      status: options.unauthorized ? 401 : 200,
    });
  }) as typeof fetch;
  let homeRenders = 0;
  let targetCommits = 0;
  let latestList: sessionList.SessionListContextValue | undefined;
  let latestShell: sessionList.ShellRegistration | null = null;
  let latestModel: ReturnType<typeof sessionList.sessionListSidebarModel> | undefined;
  let setPage: (home: boolean) => void = noop;
  let revise: (revision: number) => void = noop;
  const callbackRevisions: number[] = [];

  function HomeProbe() {
    const list = sessionList.useSessionList();
    const [revision, setRevision] = useState(0);
    // Bound failure even if the old effect/context feedback is reintroduced.
    homeRenders += 1;
    if (homeRenders > 50) throw new Error("Home registration failed to settle within 50 renders");
    const changed = () => { callbackRevisions.push(revision); };
    useHomeShellRegistration({
      account: list.account, accountMenuOpen: revision > 0, accountTrigger: trigger,
      activeSessionId: `revision-${revision}`, cancellationPending: false,
      chartLibrary: charts, creatingSession: false, hydrated: list.settled,
      loadMoreSessions: changed, modalOpen: revision > 0, modelCatalog: null,
      openAccountDialog: changed, pendingSessionId: null,
      profile: { ...emptyProfile, name: `Synthetic ${revision}` },
      rectificationErrorMessage: "", rectificationErrorSessionId: null,
      rectificationOpeningSessionId: null, rectificationSurfaceOpen: false,
      registerShellControls: list.registerShellControls,
      renameSession: changed, selectSession: changed, sessionMenuId: null,
      sessions: list.sessions, sessionsCursor: null,
      setAccountMenuOpen: noop, setPendingSessionDeletion: noop, setSessionMenuId: noop,
      shareSession: changed, showArchivedSessions: false, startNewChat: changed,
      toggleArchivedSession: changed, toggleArchivedView: changed, togglePinnedSession: changed,
      // Like useSessionManagement, intentionally new array/callbacks each render.
      visibleSessions: list.sessions.filter(() => true),
    });
    useEffect(() => { revise = setRevision; }, []);
    return null;
  }
  function Target() {
    useEffect(() => { targetCommits += 1; }, []);
    return null;
  }
  function Shell({ children }: { children: ReactNode }) {
    const list = sessionList.useSessionList();
    const registration = sessionList.useShellRegistration();
    useEffect(() => {
      latestList = list;
      latestShell = registration;
      latestModel = sessionList.sessionListSidebarModel(list, registration);
    });
    // Exercise the actual second provider and unchanged children identity too:
    // shell context updates must not re-render the Home registration producer.
    return <SidebarProvider escapeBlocked={registration?.escapeBlocked ?? false}>
      <SidebarInset inert={registration?.insetInert}>{children}</SidebarInset>
    </SidebarProvider>;
  }
  function Router() {
    const [home, showHome] = useState(true);
    useEffect(() => { setPage = showHome; }, []);
    return <sessionList.SessionListProvider><Shell>{home ? <HomeProbe /> : <Target />}</Shell></sessionList.SessionListProvider>;
  }
  try {
    await harness.render(options.strict ? <StrictMode><Router /></StrictMode> : <Router />);
  } catch (error) {
    await harness.close();
    globalThis.fetch = originalFetch;
    throw error;
  }
  return {
    harness, requests, callbackRevisions,
    get renders() { return homeRenders; },
    get commits() { return targetCommits; },
    get list() { assert.ok(latestList); return latestList; },
    get shell() { return latestShell; },
    get model() { assert.ok(latestModel); return latestModel; },
    async navigate(home: boolean) { await harness.update(() => startTransition(() => setPage(home))); },
    async revise(value: number) { await harness.update(() => revise(value)); },
    async close() { try { await harness.close(); } finally { globalThis.fetch = originalFetch; } },
  };
}

for (const strict of [false, true]) {
  test(`home registration settles and transitions unregister/reenter (StrictMode=${strict})`, async () => {
    const app = await fixture({ strict });
    try {
      assert.deepEqual(app.harness.errors, []);
      assert.ok(app.shell, "hydrated Home registers its controls");
      const idleRenders = app.renders;
      await app.harness.idle();
      assert.equal(app.renders, idleRenders, "idle shell does not feed updates back into Home");
      assert.ok(idleRenders < 15, `unexpected render growth: ${idleRenders}`);
      const reads = app.requests.length;
      await app.navigate(false);
      assert.deepEqual(app.harness.errors, []);
      assert.ok(app.commits > 0, "startTransition commits the destination");
      assert.equal(app.shell, null, "Home cleanup unregisters controls");
      assert.equal(app.model.account?.name, "Synthetic", "secondary page uses account fallback");
      await app.navigate(true);
      assert.ok(app.shell, "returning Home registers new controls");
      assert.equal(app.requests.length, reads, "shared provider does not refetch on route changes");
      await app.harness.idle();
      assert.deepEqual(app.harness.errors, []);
    } finally { await app.close(); }
  });
}

test("shell receives current callbacks, account and session state without freezing closures", async () => {
  const app = await fixture();
  try {
    assert.deepEqual(app.harness.errors, []);
    const initialCallback = app.shell?.controls.onOpenProfile;
    await app.revise(1);
    assert.equal(app.shell?.activeSessionId, "revision-1");
    assert.equal(app.shell?.insetInert, true);
    assert.equal(app.shell?.escapeBlocked, true);
    assert.notEqual(app.shell?.controls.onOpenProfile, initialCallback);
    app.shell?.controls.onOpenProfile();
    assert.deepEqual(app.callbackRevisions, [1]);
    await app.harness.update(() => {
      app.list.setAccount({ ...account, credits: 27 });
      app.list.setSessions([row]);
    });
    assert.equal(app.model.account?.credits, 27);
    assert.equal(app.model.sessions[0]?.id, row.id);
    await app.navigate(false);
    assert.equal(app.shell, null);
    assert.equal(app.model.account?.credits, 27);
    assert.equal(app.model.sessions[0]?.id, row.id);
    assert.deepEqual(app.harness.errors, []);
  } finally { await app.close(); }
});

test("401 settles signed-out fallback with no shell registration", async () => {
  const app = await fixture({ unauthorized: true });
  try {
    assert.deepEqual(app.harness.errors, []);
    assert.equal(app.list.signedOut, true);
    assert.equal(app.list.settled, true);
    await app.list.ready;
    assert.equal(app.shell, null);
    assert.deepEqual(app.model.sessions, []);
    assert.equal(app.model.account, null);
    const renders = app.renders;
    await app.harness.idle();
    assert.equal(app.renders, renders);
  } finally { await app.close(); }
});