import {
  MODULE_UI_ABI_VERSION,
  type ModuleUiHostContext,
  type ModuleUiNavigation,
  ModuleUiNavigationError,
} from "@ekklesia/module-ui-sdk";
import * as lucide from "lucide-react";
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 } from "../src/browser/host-viewport.js";
import { MODULE_ICON_COMPONENTS } from "../src/browser/module-icon.js";
import { createMemorySidebarPreference } from "../src/browser/sidebar-preference.js";
import type { DashboardSettings } from "../src/host-protocol.js";
import { DASHBOARD_MODULE_ICON_NAMES } from "../src/module-icons.js";

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

/**
 * Module navigation (manifest v9, ADR 0063): a module's own icon and primary pages in the global
 * sidebar, its real nested routes, the navigation capability a mounted module is handed through the
 * real mounting boundary, and module → Settings → back to exactly where it was — beside a
 * manifest v8 module that keeps behaving as it always has.
 */

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();
});

function entry(
  id: string,
  name: string,
  navigation: { icon: string | null; pages: { id: string; label: string; path: string }[] } = {
    icon: null,
    pages: [],
  },
) {
  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}/0.1.0` },
      version: "0.1.0",
    },
    name,
    navigation,
  };
}

const SIGNAGE_PAGES = [
  { id: "playback", label: "Playback", path: "playback" },
  { id: "timelines", label: "Timelines", path: "timelines" },
  { id: "media", label: "Media", path: "media" },
];

/** A manifest v9 module with an icon and three pages, and a manifest v8 module with neither. */
const NAVIGATION = {
  groups: [],
  ungrouped: [
    entry("signage", "Signage", { icon: "monitor-play", pages: SIGNAGE_PAGES }),
    entry("calendar", "Calendar"),
  ],
};

/** Signage declares configuration and the viewer may change it; Calendar has no settings; Archive
 * is installed but turned off, so it is in Settings but not in the navigation. */
const SETTINGS: DashboardSettings = {
  modules: [
    { available: false, id: "archive", name: "Archive" },
    { available: true, id: "signage", name: "Signage" },
  ],
  sections: [],
};

interface Mounts {
  imported: string[];
  mounted: string[];
  unmounted: string[];
  contexts: Map<string, ModuleUiHostContext>;
}

async function render(
  path: string,
  options: { readonly history?: MemoryHostHistory; readonly compact?: boolean } = {},
) {
  const history = options.history ?? createMemoryHostHistory(path);
  const titles: string[] = [];
  const mounts: Mounts = { contexts: new Map(), imported: [], mounted: [], unmounted: [] };
  const fetchImplementation = vi.fn(async (input: RequestInfo | URL) => {
    const url = String(input);
    if (url.endsWith("/api/v1/principal")) {
      return Response.json({ kind: "authenticated", userId: "user-1" });
    }
    if (url.endsWith("/api/v1/dashboard/navigation")) {
      return Response.json(NAVIGATION);
    }
    if (url.endsWith("/api/v1/dashboard/settings")) {
      return Response.json(SETTINGS);
    }
    return Response.json({ code: "AUTHORIZATION_DENIED" }, { status: 403 });
  }) as unknown as typeof fetch;
  await act(async () => {
    root.render(
      <HostApp
        config={{ apiBaseUrl, fetch: fetchImplementation }}
        history={history}
        importModule={async (url: string) => {
          const moduleId = /module-ui\/([a-z-]+)\//u.exec(url)?.[1] ?? "unknown";
          mounts.imported.push(moduleId);
          return {
            default: {
              abi: MODULE_UI_ABI_VERSION,
              id: moduleId,
              mount(element: Element, context: ModuleUiHostContext) {
                mounts.contexts.set(moduleId, context);
                const show = (): void => {
                  element.textContent = `${moduleId}:${context.navigation?.location().path ?? "-"}`;
                };
                show();
                const unsubscribe = context.navigation?.subscribe(show);
                mounts.mounted.push(moduleId);
                return () => {
                  unsubscribe?.();
                  mounts.unmounted.push(moduleId);
                };
              },
              version: "0.1.0",
            },
          };
        }}
        setDocumentTitle={(title) => titles.push(title)}
        sidebarPreference={createMemorySidebarPreference()}
        viewport={createMemoryHostViewport(options.compact ?? false)}
      />,
    );
  });
  return { history, mounts, titles };
}

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<void> {
  await act(async () => {
    element.dispatchEvent(
      new MouseEvent("click", { bubbles: true, button: 0, cancelable: true, ...init }),
    );
  });
}

/** What the mounted module rendered, read through its isolated (Shadow DOM) root. */
function moduleText(): string {
  const host = container.querySelector("[data-ekklesia-module-ui]");
  return host?.shadowRoot?.querySelector("[data-ekklesia-module-ui-root]")?.textContent ?? "";
}

const current = () =>
  [...container.querySelectorAll('nav [aria-current="page"]')].map(
    (element) => (element as HTMLElement).dataset.testid,
  );

function navigationOf(mounts: Mounts, moduleId = "signage"): ModuleUiNavigation {
  const navigation = mounts.contexts.get(moduleId)?.navigation;
  if (!navigation) {
    throw new Error(`no navigation for ${moduleId}`);
  }
  return navigation;
}

describe("a manifest v9 module's routes", () => {
  it("opens the module root as its landing view, with its pages beneath it in the sidebar", async () => {
    const { mounts, titles } = await render("/signage");

    expect(mounts.mounted).toEqual(["signage"]);
    expect(moduleText()).toBe("signage:");
    expect(titles.at(-1)).toBe("Signage");
    expect(current()).toEqual(["select-signage"]);
    const pages = [...required("module-subnavigation-signage").querySelectorAll("a")];
    expect(pages.map((link) => link.textContent)).toEqual(["Playback", "Timelines", "Media"]);
    expect(pages.map((link) => link.getAttribute("href"))).toEqual([
      "/signage/playback",
      "/signage/timelines",
      "/signage/media",
    ]);
    expect(required("module-subnavigation-signage").getAttribute("aria-label")).toBe("Signage");
  });

  it("opens a declared page directly from its deep link, as a refresh or a bookmark does", async () => {
    const { mounts, titles } = await render("/signage/timelines");

    expect(mounts.mounted).toEqual(["signage"]);
    expect(navigationOf(mounts).location()).toEqual({ page: "timelines", path: "timelines" });
    expect(moduleText()).toBe("signage:timelines");
    expect(current()).toEqual(["select-signage-timelines"]);
    expect(titles.at(-1)).toBe("Timelines · Signage");
  });

  it("opens a route beneath a declared page — a detail view — marking its page", async () => {
    const { mounts } = await render("/signage/media/sermons/2026-10-11");

    expect(navigationOf(mounts).location()).toEqual({
      page: "media",
      path: "media/sermons/2026-10-11",
    });
    expect(current()).toEqual(["select-signage-media"]);
  });

  it("is not found at a path no declared page owns, and never mounts the module for it", async () => {
    for (const path of ["/signage/nope", "/signage/timeline", "/signage/Timelines"]) {
      await act(async () => {
        root.unmount();
      });
      root = createRoot(container);
      const { mounts, titles } = await render(path);

      expect(query("host-not-found"), path).not.toBeNull();
      expect(mounts.imported, path).toEqual([]);
      expect(titles.at(-1), path).toBe("Page not found");
      expect(current(), path).toEqual([]);
    }
  });

  it("moves between its own pages without remounting, and Back and Forward walk them", async () => {
    const { history, mounts } = await render("/signage");

    await click(required("select-signage-timelines"));
    expect(history.entries).toEqual(["/signage", "/signage/timelines"]);
    expect(moduleText()).toBe("signage:timelines");
    await click(required("select-signage-media"));

    await act(async () => history.go(-1));
    expect(moduleText()).toBe("signage:timelines");
    expect(current()).toEqual(["select-signage-timelines"]);
    await act(async () => history.go(-1));
    expect(moduleText()).toBe("signage:");
    await act(async () => history.go(2));
    expect(moduleText()).toBe("signage:media");

    // One import and one mount for the whole walk: the module was never torn down.
    expect(mounts.imported).toEqual(["signage"]);
    expect(mounts.mounted).toEqual(["signage"]);
    expect(mounts.unmounted).toEqual([]);
  });

  it("moves focus to the page when the module moves to another of its pages", async () => {
    await render("/signage");
    const main = required("host-main-region");
    (document.activeElement as HTMLElement | null)?.blur();

    await click(required("select-signage-playback"));

    expect(document.activeElement).toBe(main);
  });

  it("keeps the exact page across a refresh", async () => {
    const history = createMemoryHostHistory("/signage");
    await render("/signage", { history });
    await click(required("select-signage-media"));

    await act(async () => {
      root.unmount();
    });
    root = createRoot(container);
    const { mounts } = await render("/signage/media");

    expect(navigationOf(mounts).location().path).toBe("media");
    expect(current()).toEqual(["select-signage-media"]);
  });
});

describe("a released manifest v8 module", () => {
  it("is one page, its root, with the generic icon and no sub-navigation", async () => {
    const { mounts } = await render("/calendar");

    expect(mounts.mounted).toEqual(["calendar"]);
    expect(moduleText()).toBe("calendar:");
    expect(current()).toEqual(["select-calendar"]);
    expect(query("module-subnavigation-calendar")).toBeNull();
    expect(required("select-calendar").querySelector("svg")?.dataset.icon).toBe("module");
  });

  it("is not found beneath its root, exactly as before", async () => {
    const { mounts } = await render("/calendar/events/456");

    expect(query("host-not-found")).not.toBeNull();
    expect(mounts.imported).toEqual([]);
  });

  it("still receives navigation — its root, and no Settings link when it has no settings", async () => {
    const { mounts } = await render("/calendar");
    const navigation = navigationOf(mounts, "calendar");

    expect(navigation.location()).toEqual({ page: undefined, path: "" });
    expect(navigation.settings).toBeUndefined();
    expect(() => navigation.navigate("events")).toThrowError(
      expect.objectContaining({ code: "MODULE_NAVIGATION_PATH_UNKNOWN" }),
    );
  });
});

describe("modules that are not running", () => {
  it("says a turned-off module is unavailable at its root and beneath it, mounting nothing", async () => {
    for (const path of ["/archive", "/archive/timelines", "/archive/a/b"]) {
      await act(async () => {
        root.unmount();
      });
      root = createRoot(container);
      const { mounts } = await render(path);

      expect(query("host-module-unavailable"), path).not.toBeNull();
      expect(mounts.imported, path).toEqual([]);
      // A module that is not running is absent from the navigation.
      expect(query("select-archive"), path).toBeNull();
    }
  });
});

describe("the sidebar", () => {
  it("draws a module's declared Lucide icon, and the generic icon for one that declares none", async () => {
    await render("/");

    expect(required("select-signage").querySelector("svg")?.dataset.icon).toBe(
      "module:monitor-play",
    );
    expect(required("select-signage").querySelector("svg")?.getAttribute("aria-hidden")).toBe(
      "true",
    );
    expect(required("select-calendar").querySelector("svg")?.dataset.icon).toBe("module");
  });

  it("shows a module's pages only while that module is open", async () => {
    await render("/");
    expect(query("module-subnavigation-signage")).toBeNull();

    await click(required("select-signage"));
    expect(query("module-subnavigation-signage")).not.toBeNull();

    await click(required("select-calendar"));
    expect(query("module-subnavigation-signage")).toBeNull();
  });

  it("collapsed, hides the pages and marks the module itself, named for assistive technology", async () => {
    await render("/signage/timelines");
    await click(container.querySelector('[aria-label="Collapse navigation"]') as Element);

    expect(query("module-subnavigation-signage")).toBeNull();
    expect(current()).toEqual(["select-signage"]);
    const label = required("select-signage").querySelector("[data-nav-label]");
    expect(label?.textContent).toBe("Signage");
    expect(label?.className).toBe("ek-shell-visually-hidden");
  });

  it("uses the identical hierarchy in the phone drawer, which closes once a page is chosen", async () => {
    const { history } = await render("/signage", { compact: true });

    await click(required("mobile-navigation-trigger"));
    const drawer = required("navigation-drawer");
    const pages = [
      ...drawer.querySelectorAll('[data-testid="module-subnavigation-signage"] a'),
    ] as HTMLElement[];
    expect(pages.map((link) => link.textContent)).toEqual(["Playback", "Timelines", "Media"]);
    for (const link of pages) {
      expect(link.style.minHeight).toBe("var(--ekklesia-control-height-lg)");
    }

    await click(pages[1] as HTMLElement);
    expect(history.pathname()).toBe("/signage/timelines");
    expect(query("navigation-drawer")).toBeNull();
  });
});

describe("the module navigation capability", () => {
  it("navigates to the module's own routes, adding or replacing a history entry", async () => {
    const { history, mounts } = await render("/signage");
    const navigation = navigationOf(mounts);

    await act(async () => navigation.navigate("timelines"));
    expect(history.entries).toEqual(["/signage", "/signage/timelines"]);
    await act(async () => navigation.navigate("/media/sermons/9"));
    expect(history.pathname()).toBe("/signage/media/sermons/9");
    expect(navigation.location()).toEqual({ page: "media", path: "media/sermons/9" });
    await act(async () => navigation.navigate("media", { replace: true }));
    expect(history.entries).toEqual(["/signage", "/signage/timelines", "/signage/media"]);
    await act(async () => navigation.navigate(""));
    expect(navigation.location()).toEqual({ page: undefined, path: "" });
    expect(mounts.mounted).toEqual(["signage"]);
  });

  it.each([
    ["../calendar", "MODULE_NAVIGATION_PATH_INVALID"],
    ["timelines/../../calendar", "MODULE_NAVIGATION_PATH_INVALID"],
    ["//evil.example.test", "MODULE_NAVIGATION_PATH_INVALID"],
    ["https://evil.example.test/", "MODULE_NAVIGATION_PATH_INVALID"],
    ["javascript:alert(1)", "MODULE_NAVIGATION_PATH_INVALID"],
    ["timelines?x=1", "MODULE_NAVIGATION_PATH_INVALID"],
    ["timelines#top", "MODULE_NAVIGATION_PATH_INVALID"],
    ["nope", "MODULE_NAVIGATION_PATH_UNKNOWN"],
    ["timeline", "MODULE_NAVIGATION_PATH_UNKNOWN"],
  ])("refuses %j — no other module, platform page, or undeclared page", async (path, code) => {
    const { history, mounts } = await render("/signage");
    const navigation = navigationOf(mounts);

    expect(() => navigation.navigate(path)).toThrowError(expect.objectContaining({ code }));
    expect(() => navigation.link(path)).toThrowError(ModuleUiNavigationError);
    expect(history.entries).toEqual(["/signage"]);
  });

  it("names nothing it refused in its error", async () => {
    const { mounts } = await render("/signage");
    const failure = (() => {
      try {
        navigationOf(mounts).navigate("../calendar?token=secret");
      } catch (error) {
        return error as Error;
      }
      return undefined;
    })();
    expect(failure).toBeInstanceOf(ModuleUiNavigationError);
    expect(`${failure?.message}${failure?.stack}`).not.toMatch(/calendar|secret/u);
  });

  it("makes real links: in place on an ordinary click, to the browser with a modifier", async () => {
    const { history, mounts } = await render("/signage");
    const link = navigationOf(mounts).link("timelines");
    expect(link.href).toBe("/signage/timelines");

    const ordinary = {
      altKey: false,
      button: 0,
      ctrlKey: false,
      defaultPrevented: false,
      metaKey: false,
      preventDefault: vi.fn(),
      shiftKey: false,
    };
    await act(async () => link.onClick(ordinary));
    expect(ordinary.preventDefault).toHaveBeenCalledOnce();
    expect(history.pathname()).toBe("/signage/timelines");

    const newTab = { ...ordinary, metaKey: true, preventDefault: vi.fn() };
    await act(async () => navigationOf(mounts).link("media").onClick(newTab));
    expect(newTab.preventDefault).not.toHaveBeenCalled();
    expect(history.pathname()).toBe("/signage/timelines");
  });

  it("reports moves made by the host — the sidebar, Back — to the mounted module", async () => {
    const { history, mounts } = await render("/signage");
    const listener = vi.fn();
    navigationOf(mounts).subscribe(listener);

    await click(required("select-signage-playback"));
    await act(async () => history.go(-1));

    expect(listener).toHaveBeenCalledTimes(2);
  });
});

describe("module → Settings → back to exactly where it was", () => {
  it("opens the module's Settings page carrying its current page as the place to return to", async () => {
    const { history, mounts } = await render("/signage/timelines");
    const settings = navigationOf(mounts).settings;

    expect(settings?.link().href).toBe("/settings/signage?return=%2Fsignage%2Ftimelines");
    await act(async () => settings?.open());

    expect(history.entries).toEqual([
      "/signage/timelines",
      "/settings/signage?return=%2Fsignage%2Ftimelines",
    ]);
    expect(query("module-settings")).not.toBeNull();
    const back =
      required("module-settings").querySelector<HTMLAnchorElement>(".ek-page-header__back");
    expect(back?.getAttribute("href")).toBe("/signage/timelines");
    expect(back?.textContent).toContain("Back to Signage");

    await click(back as HTMLAnchorElement);
    expect(history.pathname()).toBe("/signage/timelines");
    expect(current()).toEqual(["select-signage-timelines"]);
  });

  it("returns to where the module is now, even if it never read its location since moving", async () => {
    const { history, mounts } = await render("/signage");
    const settings = navigationOf(mounts).settings;
    mounts.contexts.get("signage")?.navigation?.subscribe(() => undefined)();

    await act(async () => history.push("/signage/media"));

    expect(settings?.link().href).toBe("/settings/signage?return=%2Fsignage%2Fmedia");
  });

  it("keeps the place to return to across a refresh of the Settings page", async () => {
    await render("/settings/signage?return=%2Fsignage%2Fmedia%2Fsermons%2F9");

    const back = required("module-settings").querySelector(".ek-page-header__back");
    expect(back?.getAttribute("href")).toBe("/signage/media/sermons/9");
    expect(back?.textContent).toContain("Back to Signage");
  });

  it("keeps it when the Settings address is respelled", async () => {
    const { history } = await render("/settings/signage/?return=%2Fsignage%2Fmedia");

    expect(history.entries).toEqual(["/settings/signage?return=%2Fsignage%2Fmedia"]);
  });

  it.each([
    ["another origin", "https://evil.example.test/signage"],
    ["a protocol-relative URL", "//evil.example.test"],
    ["a script", "javascript:alert(1)"],
    ["the API", "/api/v1/principal"],
    ["a page the module does not declare", "/signage/nope"],
    ["a module that is not running", "/archive"],
    ["a module that does not exist", "/nowhere"],
    ["traversal", "/signage/../api"],
    ["a nested query", "/signage?return=https://evil.example.test"],
  ])("ignores a return target naming %s, going back to Settings instead", async (_label, target) => {
    await render(`/settings/signage?return=${encodeURIComponent(target)}`);

    const back = required("module-settings").querySelector(".ek-page-header__back");
    expect(back?.getAttribute("href")).toBe("/settings");
    expect(back?.textContent).toContain("Back to Settings");
  });

  it("offers no Settings link to a module whose settings this viewer cannot open", async () => {
    const { mounts } = await render("/calendar");

    expect(navigationOf(mounts, "calendar").settings).toBeUndefined();
  });
});

describe("module icons", () => {
  it("maps exactly the names the platform accepts, each to a real Lucide component", () => {
    expect(Object.keys(MODULE_ICON_COMPONENTS).sort()).toEqual(
      [...DASHBOARD_MODULE_ICON_NAMES].sort(),
    );
    const exports = lucide as unknown as Record<string, unknown>;
    for (const name of DASHBOARD_MODULE_ICON_NAMES) {
      const pascal = name
        .split("-")
        .map((part) => `${part[0]?.toUpperCase()}${part.slice(1)}`)
        .join("");
      expect(MODULE_ICON_COMPONENTS[name], name).toBe(exports[pascal]);
    }
  });

  it("draws the generic icon for a name this Dashboard cannot draw", async () => {
    NAVIGATION.ungrouped.push(entry("press", "Press", { icon: "not-yet-an-icon", pages: [] }));
    try {
      await render("/");
      expect(required("select-press").querySelector("svg")?.dataset.icon).toBe("module");
    } finally {
      NAVIGATION.ungrouped.pop();
    }
  });
});