// OnboardingBannerSlot — the list's fold state and the path's wiring (#397, #409).
//
// renderToStaticMarkup runs no click, so React's hooks come from the shared
// harness (src/test/hookHarness.ts): the slot runs as a plain function, and
// its state survives from one call to the next as it would between two
// renders of a mounted component.
import { describe, it, expect, vi, beforeEach } from "vitest";
import { isValidElement, type ReactElement, type ReactNode } from "react";
import { Outlet } from "react-router-dom";

vi.mock("react", async (orig) => (await import("../../test/hookHarness")).fakeReact(await orig()));
const ctx = vi.hoisted(() => ({
  pathname: "/reports",
  onboarding: null as unknown,
}));
vi.mock("react-router-dom", async (importOriginal) => ({
  ...(await importOriginal<typeof import("react-router-dom")>()),
  useLocation: () => ({ pathname: ctx.pathname }),
}));
vi.mock("../../contexts/OnboardingContext", () => ({
  OnboardingProvider: ({ children }: { children: ReactNode }) => children,
  useOnboarding: () => ctx.onboarding,
}));
vi.mock("./Sidebar", () => ({ default: () => null }));

import { hookHarness } from "../../test/hookHarness";
import AppShell, { OnboardingBannerSlot } from "./AppShell";
import OnboardingBanner, { type OnboardingBannerProps } from "../onboarding/OnboardingBanner";
import { computeChecklist } from "../../utils/onboardingChecklist";
import { nextStep } from "../../utils/onboardingPath";
import type { OnboardingValue } from "../../hooks/useOnboardingChecklist";

const harness = hookHarness();

type AnyElement = ReactElement<Record<string, unknown> & { children?: ReactNode }>;

function find(node: ReactNode, pred: (el: AnyElement) => boolean): AnyElement[] {
  if (Array.isArray(node)) return node.flatMap((n) => find(n, pred));
  if (!isValidElement(node)) return [];
  const el = node as AnyElement;
  return [...(pred(el) ? [el] : []), ...find(el.props.children, pred)];
}

function onboardingValue(): OnboardingValue {
  const counters = { sources: 1, imports: 1, manualCategorized: 0, budgetEntries: 0, transactions: 40 };
  const checklist = computeChecklist(counters, { importFolderSet: true, budgetAllowed: true });
  return {
    status: "ready",
    checklist,
    counters,
    hidden: false,
    budgetReady: true,
    nextStep: nextStep(checklist),
    mode: "banner",
    cardPage: null,
    hide: vi.fn(async () => undefined),
    show: vi.fn(async () => undefined),
    skip: vi.fn(async () => undefined),
    resume: vi.fn(async () => undefined),
    refresh: vi.fn(async () => undefined),
  };
}

/** One render of the mounted slot: its hooks are read in the same order each time. */
function renderSlot(): OnboardingBannerProps {
  const element = harness.render(() => OnboardingBannerSlot() as ReactElement<OnboardingBannerProps>);
  expect(element.type).toBe(OnboardingBanner);
  return element.props;
}

beforeEach(() => {
  harness.clear();
  ctx.pathname = "/reports";
  ctx.onboarding = onboardingValue();
});

describe("OnboardingBannerSlot (#397)", () => {
  it("hands the shared path to the banner, the list folded", () => {
    const value = ctx.onboarding as OnboardingValue;
    const props = renderSlot();
    expect(props.mode).toBe("banner");
    expect(props.checklist).toBe(value.checklist);
    expect(props.nextStep).toBe(value.nextStep);
    expect(props.budgetReady).toBe(true);
    expect(props.listOpen).toBe(false);
    expect(props.onHide).toBe(value.hide);
    expect(props.onResume).toBe(value.resume);
  });

  it("passes the mode and the entitlement as they come: the banner decides what to show", () => {
    ctx.onboarding = { ...onboardingValue(), mode: "none", budgetReady: false };
    const props = renderSlot();
    expect(props.mode).toBe("none");
    expect(props.budgetReady).toBe(false);
  });

  it("'Show the list' unfolds it, 'Close the list' folds it back", () => {
    renderSlot().onToggleList();
    expect(renderSlot().listOpen).toBe(true);
    // Another render without a click keeps it unfolded.
    expect(renderSlot().listOpen).toBe(true);
    renderSlot().onToggleList();
    expect(renderSlot().listOpen).toBe(false);
  });

  it("AppShell mounts one slot per route, so each page starts with the list folded", () => {
    ctx.pathname = "/import";
    const shell = harness.render(() => AppShell() as ReactNode);
    const [slot] = find(shell, (e) => e.type === OnboardingBannerSlot);
    expect(slot).toBeDefined();
    expect(slot.key).toBe("/import");

    ctx.pathname = "/transactions";
    const [next] = find(harness.render(() => AppShell() as ReactNode), (e) => e.type === OnboardingBannerSlot);
    expect(next.key).toBe("/transactions");
  });

  it("AppShell puts the slot before the routed page, inside the provider, inside main", () => {
    const shell = harness.render(() => AppShell() as ReactNode);
    const [main] = find(shell, (e) => e.type === "main");
    expect(main).toBeDefined();
    const [provider] = find(main.props.children, (e) => typeof e.type === "function");
    const children = provider.props.children as ReactNode[];
    expect(Array.isArray(children)).toBe(true);
    const [first, second] = children as AnyElement[];
    expect(first.type).toBe(OnboardingBannerSlot);
    expect(second.type).toBe(Outlet);
  });
});