import { MODULE_UI_ABI_VERSION, type ModuleUiHostContext } from "@ekklesia/module-ui-sdk";
import { act } from "react";
import { createRoot, type Root } from "react-dom/client";
import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
import { HostApp } from "../src/browser/HostApp.js";
import { createMemoryHostHistory, type MemoryHostHistory } from "../src/browser/host-history.js";
import { createMemoryHostViewport, type MemoryHostViewport } from "../src/browser/host-viewport.js";
import {
  createLocalSidebarPreference,
  createMemorySidebarPreference,
  type SidebarPreference,
} from "../src/browser/sidebar-preference.js";
import type { EkklesiaHostConfig } from "../src/host-protocol.js";
import { isolatedText } from "./support/isolated-dom.js";

declare global {
  // eslint-disable-next-line no-var
  var IS_REACT_ACT_ENVIRONMENT: boolean | undefined;
}

/**
 * The Dashboard shell's navigation (ADR 0058): the collapsible desktop sidebar, its account area,
 * and the phone drawer. Every test drives the real `HostApp` with in-memory history, viewport, and
 * sidebar preference, so routing, resizing, and persistence are all observable.
 */

const apiBaseUrl = "https://ekklesia.example.test";

let container: HTMLDivElement;
let root: Root;
let consoleError: ReturnType<typeof vi.spyOn>;

beforeEach(() => {
  globalThis.IS_REACT_ACT_ENVIRONMENT = true;
  container = document.createElement("div");
  document.body.append(container);
  root = createRoot(container);
  consoleError = vi.spyOn(console, "error").mockImplementation(() => undefined);
});

afterEach(async () => {
  await act(async () => {
    root.unmount();
  });
  container.remove();
  consoleError.mockRestore();
  window.localStorage.clear();
});

function entry(id: string, name: string, version = "0.1.0") {
  return {
    module: {
      api: { baseUrl: `/api/v1/modules/${id}` },
      contributions: [],
      display: null,
      id,
      permissions: [],
      realtime: { baseUrl: `/api/v1/module-realtime/${id}` },
      ui: { url: `/api/v1/module-ui/${id}/${version}` },
      version,
    },
    name,
    navigation: { icon: null, pages: [] },
  };
}

// What the server's navigation returns: the eligible modules only. A disabled module (`retired`) is
// simply absent from it (ADR 0028), which is the whole of "hidden from navigation".
const NAVIGATION = {
  groups: [{ id: "media", label: "Media", modules: [entry("signage", "Signage")], order: 10 }],
  ungrouped: [entry("calendar", "Calendar", "2.0.0")],
};

interface Platform {
  readonly fetch: typeof fetch;
  readonly calls: string[];
}

function platform(): Platform {
  let authenticated = true;
  const calls: string[] = [];
  const implementation = vi.fn(async (input: RequestInfo | URL) => {
    const url = String(input);
    calls.push(url);
    if (url.endsWith("/api/auth/sign-out")) {
      authenticated = false;
      return Response.json({ success: true });
    }
    if (url.endsWith("/api/v1/principal")) {
      return Response.json(
        authenticated ? { kind: "authenticated", userId: "user-1" } : { kind: "anonymous" },
      );
    }
    if (url.endsWith("/api/v1/dashboard/navigation")) {
      return authenticated
        ? Response.json(NAVIGATION)
        : Response.json({ code: "AUTHORIZATION_DENIED" }, { status: 403 });
    }
    if (url.endsWith("/api/v1/devices")) {
      return Response.json({ code: "AUTHORIZATION_DENIED" }, { status: 403 });
    }
    return Response.json({ code: "NOT_FOUND" }, { status: 404 });
  }) as unknown as typeof fetch;
  return { calls, fetch: implementation };
}

function artifactFor(url: string) {
  const id = url.includes("/calendar/") ? "calendar" : "signage";
  return {
    default: {
      abi: MODULE_UI_ABI_VERSION,
      id,
      mount(element: Element, context: ModuleUiHostContext) {
        element.textContent = `${context.moduleId} mounted`;
        return () => {
          element.textContent = "";
        };
      },
      version: id === "calendar" ? "2.0.0" : "0.1.0",
    },
  };
}

interface Rendered {
  readonly history: MemoryHostHistory;
  readonly viewport: MemoryHostViewport;
  readonly preference: SidebarPreference;
  readonly platform: Platform;
}

async function render(
  options: {
    readonly path?: string;
    readonly compact?: boolean;
    readonly preference?: SidebarPreference;
    readonly history?: MemoryHostHistory;
    readonly viewport?: MemoryHostViewport;
  } = {},
): Promise<Rendered> {
  const history = options.history ?? createMemoryHostHistory(options.path ?? "/");
  const viewport = options.viewport ?? createMemoryHostViewport(options.compact ?? false);
  const preference = options.preference ?? createMemorySidebarPreference();
  const stub = platform();
  const config: EkklesiaHostConfig = { apiBaseUrl, fetch: stub.fetch };
  await act(async () => {
    root.render(
      <HostApp
        config={config}
        history={history}
        importModule={async (url) => artifactFor(url)}
        sidebarPreference={preference}
        viewport={viewport}
      />,
    );
  });
  return { history, platform: stub, preference, viewport };
}

async function remount(rendered: Rendered, preference = rendered.preference): Promise<void> {
  await act(async () => {
    root.unmount();
  });
  root = createRoot(container);
  await render({ history: rendered.history, preference, viewport: rendered.viewport });
}

function query(testId: string): HTMLElement | null {
  return container.querySelector<HTMLElement>(`[data-testid="${testId}"]`);
}

function required(testId: string): HTMLElement {
  const element = query(testId);
  if (!element) {
    throw new Error(`missing ${testId}`);
  }
  return element;
}

async function click(element: Element, init: MouseEventInit = {}): Promise<MouseEvent> {
  const event = new MouseEvent("click", { bubbles: true, button: 0, cancelable: true, ...init });
  await act(async () => {
    element.dispatchEvent(event);
  });
  return event;
}

async function key(element: Element, keyName: string, init: KeyboardEventInit = {}) {
  const event = new KeyboardEvent("keydown", {
    bubbles: true,
    cancelable: true,
    key: keyName,
    ...init,
  });
  await act(async () => {
    element.dispatchEvent(event);
  });
  return event;
}

async function focus(element: HTMLElement): Promise<void> {
  await act(async () => {
    element.focus();
  });
}

const sidebar = (): HTMLElement => required("host-sidebar");
const navLink = (id: string): HTMLElement => required(`select-${id}`);

describe("desktop sidebar", () => {
  it("is expanded by default: icons and labels, Overview first, then the modules in the server's order", async () => {
    await render();

    expect(sidebar().dataset.sidebar).toBe("expanded");
    const links = [...sidebar().querySelectorAll("nav a")];
    expect(links.map((link) => link.textContent)).toEqual(["Overview", "Signage", "Calendar"]);
    for (const link of links) {
      const icon = link.querySelector("svg");
      expect(icon?.getAttribute("aria-hidden"), link.textContent ?? "").toBe("true");
    }
    expect(query("nav-tooltip")).toBeNull();
  });

  it("draws the Overview with its own icon and every module with the one generic module icon", async () => {
    await render();

    expect(navLink("overview").querySelector("svg")?.dataset.icon).toBe("overview");
    for (const id of ["signage", "calendar"]) {
      expect(navLink(id).querySelector("svg")?.dataset.icon, id).toBe("module");
      expect(navLink(id).querySelector("svg")?.classList.contains("lucide-blocks"), id).toBe(true);
    }
  });

  it("marks the open page, the Overview or a module, with aria-current", async () => {
    await render({ path: "/calendar" });

    expect(navLink("calendar").getAttribute("aria-current")).toBe("page");
    expect(navLink("overview").getAttribute("aria-current")).toBeNull();

    await click(navLink("overview"));
    expect(navLink("overview").getAttribute("aria-current")).toBe("page");
    expect(navLink("calendar").getAttribute("aria-current")).toBeNull();
  });

  it("does not list a disabled module, whose address still says it is unavailable", async () => {
    await render({ path: "/retired" });

    expect(query("select-retired")).toBeNull();
    expect(query("host-module-unavailable")).not.toBeNull();
    expect(container.querySelector('nav [aria-current="page"]')).toBeNull();
  });

  it("collapses to icons only, through a labelled toggle that says what it controls", async () => {
    const { preference } = await render();
    const toggle = required("sidebar-toggle");
    const nav = sidebar().querySelector("nav");

    expect(toggle.tagName).toBe("BUTTON");
    expect(toggle.getAttribute("aria-label")).toBe("Collapse navigation");
    expect(toggle.getAttribute("aria-expanded")).toBe("true");
    expect(toggle.getAttribute("aria-controls")).toBe(nav?.id);
    expect(nav?.id).toBeTruthy();

    await click(toggle);

    expect(sidebar().dataset.sidebar).toBe("collapsed");
    expect(toggle.getAttribute("aria-label")).toBe("Expand navigation");
    expect(toggle.getAttribute("aria-expanded")).toBe("false");
    expect(preference.read()).toBe("collapsed");
    // Icon-only to the eye, still named to assistive technology.
    for (const id of ["overview", "signage", "calendar"]) {
      const label = navLink(id).querySelector("[data-nav-label]");
      expect(label?.classList.contains("ek-shell-visually-hidden"), id).toBe(true);
      expect(navLink(id).textContent, id).not.toBe("");
    }

    await click(toggle);
    expect(sidebar().dataset.sidebar).toBe("expanded");
    expect(preference.read()).toBe("expanded");
  });

  it("keeps the chosen mode across a remount, as across a reload", async () => {
    const rendered = await render();
    await click(required("sidebar-toggle"));

    await remount(rendered);

    expect(sidebar().dataset.sidebar).toBe("collapsed");
  });

  it("keeps it in this browser's own storage, so a reload with a fresh page still finds it", async () => {
    const rendered = await render({
      preference: createLocalSidebarPreference(window.localStorage),
    });
    await click(required("sidebar-toggle"));

    await remount(rendered, createLocalSidebarPreference(window.localStorage));

    expect(sidebar().dataset.sidebar).toBe("collapsed");
  });

  it("names a collapsed item in a tooltip on keyboard focus and on hover, and Escape dismisses it", async () => {
    await render({ preference: createMemorySidebarPreference("collapsed") });

    await focus(navLink("signage"));
    const tooltip = required("nav-tooltip");
    expect(tooltip.textContent).toBe("Signage");
    // A visual duplicate of the link's own accessible name, so it is not announced twice.
    expect(tooltip.getAttribute("aria-hidden")).toBe("true");

    await key(navLink("signage"), "Escape");
    expect(query("nav-tooltip")).toBeNull();
    // Escape hides the tooltip without moving focus.
    expect(document.activeElement).toBe(navLink("signage"));

    await act(async () => {
      navLink("signage").blur();
    });
    await act(async () => {
      navLink("calendar").dispatchEvent(new MouseEvent("mouseover", { bubbles: true }));
    });
    expect(required("nav-tooltip").textContent).toBe("Calendar");
  });

  it("shows no tooltip while expanded, where the label is already visible", async () => {
    await render();

    await focus(navLink("signage"));

    expect(query("nav-tooltip")).toBeNull();
  });

  it("names the collapse toggle and the account control in tooltips when collapsed", async () => {
    await render({ preference: createMemorySidebarPreference("collapsed") });

    await focus(required("sidebar-toggle"));
    expect(required("nav-tooltip").textContent).toBe("Expand navigation");
    await focus(required("host-account-menu"));
    expect(required("nav-tooltip").textContent).toBe("Your account");
  });

  it("is the only navigation: no application top bar", async () => {
    await render();

    expect(container.querySelector('[data-testid="host-shell"] > header')).toBeNull();
    expect(query("mobile-navigation-trigger")).toBeNull();
    // The neutral identity placeholder sits at the top of the sidebar, and is not a heading: each
    // page's own title is.
    const brand = required("shell-brand");
    expect(sidebar().contains(brand)).toBe(true);
    expect(brand.querySelector("h1, h2")).toBeNull();
  });

  it("orders keyboard focus top to bottom: toggle, Overview, modules, then the account control", async () => {
    await render();

    const focusable = [
      ...sidebar().querySelectorAll<HTMLElement>("a[href], button:not([disabled])"),
    ].map((element) => element.dataset.testid);

    expect(focusable).toEqual([
      "sidebar-toggle",
      "select-overview",
      "select-signage",
      "select-calendar",
      "host-account-menu",
    ]);
  });

  it("gives every navigation item a pointer and touch target of at least the medium control height", async () => {
    await render();

    for (const id of ["overview", "signage", "calendar"]) {
      expect(navLink(id).style.minHeight, id).toBe("var(--ekklesia-control-height-md)");
    }
  });
});

describe("the account area", () => {
  it("is anchored at the bottom of the sidebar as a product-owned menu button", async () => {
    await render();
    const trigger = required("host-account-menu");

    expect(sidebar().lastElementChild?.contains(trigger)).toBe(true);
    expect(trigger.tagName).toBe("BUTTON");
    expect(trigger.getAttribute("aria-haspopup")).toBe("menu");
    expect(trigger.getAttribute("aria-expanded")).toBe("false");
    expect(trigger.textContent).toContain("Your account");
    // This harness serves no account, so the control names the area; the opaque user id is never
    // shown either way. With an account it names the person (account-appearance.test.tsx).
    expect(container.textContent).not.toContain("user-1");
    expect(query("host-account-menu-list")).toBeNull();
  });

  it("opens on activation with focus on its first item, and offers only destinations that work", async () => {
    await render();
    const trigger = required("host-account-menu");

    await click(trigger);

    const menu = required("host-account-menu-list");
    expect(menu.getAttribute("role")).toBe("menu");
    expect(trigger.getAttribute("aria-expanded")).toBe("true");
    expect(trigger.getAttribute("aria-controls")).toBe(menu.id);
    const items = [...menu.querySelectorAll('[role="menuitem"]')];
    expect(items.map((item) => item.textContent)).toEqual(["Account", "Appearance", "Sign out"]);
    expect(document.activeElement).toBe(items[0]);
    // Account and Appearance are real links to real pages (ADR 0062); Sign out is an action.
    expect([...menu.querySelectorAll("a")].map((link) => link.getAttribute("href"))).toEqual([
      "/account",
      "/account/appearance",
    ]);
    expect(items[2]?.tagName).toBe("BUTTON");
  });

  it("opens from the keyboard with ArrowDown, and Escape closes it and returns focus", async () => {
    await render();
    const trigger = required("host-account-menu");
    await focus(trigger);

    await key(trigger, "ArrowDown");
    expect(document.activeElement).toBe(required("host-account-link"));
    await key(required("host-account-link"), "ArrowUp");
    expect(document.activeElement).toBe(required("host-logout"));

    await key(required("host-logout"), "Escape");
    expect(query("host-account-menu-list")).toBeNull();
    expect(document.activeElement).toBe(trigger);
  });

  it("closes when focus or a pointer leaves it, without signing anyone out", async () => {
    const { platform: stub } = await render();
    await click(required("host-account-menu"));

    await act(async () => {
      document.body.dispatchEvent(new MouseEvent("pointerdown", { bubbles: true }));
    });
    expect(query("host-account-menu-list")).toBeNull();

    await click(required("host-account-menu"));
    await key(required("host-logout"), "Tab");
    expect(query("host-account-menu-list")).toBeNull();
    expect(stub.calls.some((url) => url.endsWith("/api/auth/sign-out"))).toBe(false);
  });

  it("signs out from the menu, back to the sign-in form", async () => {
    const { platform: stub } = await render({ path: "/calendar" });

    await click(required("host-account-menu"));
    await click(required("host-logout"));

    expect(query("host-login")).not.toBeNull();
    expect(query("host-sidebar")).toBeNull();
    expect(stub.calls.some((url) => url.endsWith("/api/auth/sign-out"))).toBe(true);
  });

  it("never uses a browser-native dialog", async () => {
    const alert = vi.fn();
    const confirm = vi.fn(() => true);
    const prompt = vi.fn(() => null);
    vi.stubGlobal("alert", alert);
    vi.stubGlobal("confirm", confirm);
    vi.stubGlobal("prompt", prompt);
    try {
      await render({ compact: true });
      await click(required("mobile-navigation-trigger"));
      await key(navLink("overview"), "Escape");
      await click(required("mobile-navigation-trigger"));
      await click(required("host-account-menu"));
      await click(required("host-logout"));

      expect(alert).not.toHaveBeenCalled();
      expect(confirm).not.toHaveBeenCalled();
      expect(prompt).not.toHaveBeenCalled();
    } finally {
      vi.unstubAllGlobals();
    }
  });
});

describe("phone navigation drawer", () => {
  it("replaces the sidebar with one labelled menu trigger, and renders no navigation until opened", async () => {
    await render({ compact: true });

    expect(query("host-sidebar")).toBeNull();
    const trigger = required("mobile-navigation-trigger");
    expect(trigger.tagName).toBe("BUTTON");
    expect(trigger.getAttribute("aria-label")).toBe("Open navigation");
    expect(trigger.getAttribute("aria-expanded")).toBe("false");
    expect(trigger.getAttribute("aria-controls")).toBe("ekklesia-navigation-drawer");
    expect(query("navigation-drawer")).toBeNull();
    expect(query("host-overview")).not.toBeNull();
  });

  it("opens as a modal dialog with the same navigation, focus inside, and the page inert", async () => {
    await render({ compact: true, path: "/calendar" });
    const trigger = required("mobile-navigation-trigger");

    await click(trigger);

    const drawer = required("navigation-drawer");
    expect(drawer.id).toBe("ekklesia-navigation-drawer");
    expect(drawer.getAttribute("role")).toBe("dialog");
    expect(drawer.getAttribute("aria-modal")).toBe("true");
    expect(drawer.getAttribute("aria-label")).toBe("Navigation");
    expect(trigger.getAttribute("aria-expanded")).toBe("true");
    expect(document.activeElement).toBe(required("navigation-drawer-close"));
    expect([...drawer.querySelectorAll("nav a")].map((link) => link.textContent)).toEqual([
      "Overview",
      "Signage",
      "Calendar",
    ]);
    // The same hierarchy and the same current page as on desktop, always with labels.
    expect(navLink("calendar").getAttribute("aria-current")).toBe("page");
    expect(drawer.querySelector(".ek-shell-visually-hidden[data-nav-label]")).toBeNull();
    expect(required("host-main-region").hasAttribute("inert")).toBe(true);
    expect(drawer.contains(required("host-account-menu"))).toBe(true);
  });

  it("closes on Escape and returns focus to the trigger", async () => {
    await render({ compact: true });
    const trigger = required("mobile-navigation-trigger");
    await click(trigger);

    await key(navLink("signage"), "Escape");

    expect(query("navigation-drawer")).toBeNull();
    expect(document.activeElement).toBe(trigger);
    expect(trigger.getAttribute("aria-expanded")).toBe("false");
    expect(required("host-main-region").hasAttribute("inert")).toBe(false);
  });

  it("closes from its close button and from the backdrop, returning focus each time", async () => {
    await render({ compact: true });
    const trigger = required("mobile-navigation-trigger");

    await click(trigger);
    await click(required("navigation-drawer-close"));
    expect(query("navigation-drawer")).toBeNull();
    expect(document.activeElement).toBe(trigger);

    await click(trigger);
    await click(required("navigation-drawer-backdrop"));
    expect(query("navigation-drawer")).toBeNull();
    expect(document.activeElement).toBe(trigger);
  });

  it("traps Tab and Shift+Tab inside itself while open", async () => {
    await render({ compact: true });
    await click(required("mobile-navigation-trigger"));
    const drawer = required("navigation-drawer");
    const focusable = [...drawer.querySelectorAll<HTMLElement>("a[href], button:not([disabled])")];
    const first = focusable[0] as HTMLElement;
    const last = focusable.at(-1) as HTMLElement;
    expect(first).toBe(required("navigation-drawer-close"));
    expect(last).toBe(required("host-account-menu"));

    await focus(last);
    const forward = await key(last, "Tab");
    expect(forward.defaultPrevented).toBe(true);
    expect(document.activeElement).toBe(first);

    const backward = await key(first, "Tab", { shiftKey: true });
    expect(backward.defaultPrevented).toBe(true);
    expect(document.activeElement).toBe(last);

    // Tab between two inner items is left to the browser.
    await focus(navLink("overview"));
    expect((await key(navLink("overview"), "Tab")).defaultPrevented).toBe(false);
  });

  it("closes when a destination is chosen, opens that page, and puts focus on the page", async () => {
    const { history } = await render({ compact: true });
    await click(required("mobile-navigation-trigger"));

    await click(navLink("signage"));

    expect(query("navigation-drawer")).toBeNull();
    expect(history.entries).toEqual(["/", "/signage"]);
    expect(isolatedText(query("module-container"))).toBe("signage mounted");
    expect(document.activeElement).toBe(required("host-main-region"));
  });

  it("closes when the page already open is chosen, and still moves focus to the page", async () => {
    const { history } = await render({ compact: true, path: "/calendar" });
    await click(required("mobile-navigation-trigger"));

    await click(navLink("calendar"));

    expect(query("navigation-drawer")).toBeNull();
    expect(history.entries).toEqual(["/calendar"]);
    expect(document.activeElement).toBe(required("host-main-region"));
  });

  it("closes on Back and Forward, which keep working with the drawer", async () => {
    const { history } = await render({ compact: true });
    await click(required("mobile-navigation-trigger"));
    await click(navLink("calendar"));
    await click(required("mobile-navigation-trigger"));

    await act(async () => {
      history.go(-1);
    });

    expect(query("navigation-drawer")).toBeNull();
    expect(query("host-overview")).not.toBeNull();
    await act(async () => {
      history.go(1);
    });
    expect(isolatedText(query("module-container"))).toBe("calendar mounted");
  });

  it("signs out from the account menu inside the drawer", async () => {
    await render({ compact: true });
    await click(required("mobile-navigation-trigger"));

    await click(required("host-account-menu"));
    await click(required("host-logout"));

    expect(query("host-login")).not.toBeNull();
  });

  it("gives drawer items a touch target of at least the large control height", async () => {
    await render({ compact: true });
    await click(required("mobile-navigation-trigger"));

    for (const id of ["overview", "signage", "calendar"]) {
      expect(navLink(id).style.minHeight, id).toBe("var(--ekklesia-control-height-lg)");
    }
    expect(required("mobile-navigation-trigger").style.minHeight).toBe(
      "var(--ekklesia-control-height-lg)",
    );
  });
});

describe("moving between phone and desktop layouts", () => {
  it("keeps the open page and the desktop mode, and drops an open drawer cleanly", async () => {
    const { viewport, history } = await render({
      compact: true,
      path: "/signage",
      preference: createMemorySidebarPreference("collapsed"),
    });
    await click(required("mobile-navigation-trigger"));
    await focus(navLink("calendar"));

    await act(async () => {
      viewport.setCompact(false);
    });

    expect(query("navigation-drawer")).toBeNull();
    expect(sidebar().dataset.sidebar).toBe("collapsed");
    expect(navLink("signage").getAttribute("aria-current")).toBe("page");
    expect(history.entries).toEqual(["/signage"]);
    expect(isolatedText(query("module-container"))).toBe("signage mounted");
    expect(required("host-main-region").hasAttribute("inert")).toBe(false);
    // Focus was inside the drawer that went away; it lands on the page rather than nowhere.
    expect(document.activeElement).toBe(required("host-main-region"));

    await act(async () => {
      viewport.setCompact(true);
    });
    expect(query("host-sidebar")).toBeNull();
    expect(query("navigation-drawer")).toBeNull();
    expect(required("mobile-navigation-trigger").getAttribute("aria-expanded")).toBe("false");
  });

  it("does not remount the open module when the layout changes", async () => {
    const mounts: string[] = [];
    const viewport = createMemoryHostViewport(false);
    const history = createMemoryHostHistory("/signage");
    const stub = platform();
    await act(async () => {
      root.render(
        <HostApp
          config={{ apiBaseUrl, fetch: stub.fetch }}
          history={history}
          importModule={async (url) => {
            mounts.push(url);
            return artifactFor(url);
          }}
          sidebarPreference={createMemorySidebarPreference()}
          viewport={viewport}
        />,
      );
    });

    await act(async () => {
      viewport.setCompact(true);
    });
    await act(async () => {
      viewport.setCompact(false);
    });

    expect(mounts).toHaveLength(1);
    expect(isolatedText(query("module-container"))).toBe("signage mounted");
  });
});