import { describe, it, expect, afterEach } from "vitest";
import { pluginRegistry } from "./registry";

const TASK_SIDEBAR_SLOT = "task-sidebar";
const TASK_CREATED_ACTION = "task.created";
const APP_STATUS_LEFT_SLOT = "app-status-bar-left";

function cleanup(...pluginIds: string[]) {
  pluginIds.forEach((id) => pluginRegistry.unregisterPlugin(id));
}

describe("pluginRegistry", () => {
  afterEach(() => {
    cleanup("plugin-a", "plugin-b");
  });

  it("registers and returns a route via the scoped registry view", () => {
    const scoped = pluginRegistry.forPlugin("plugin-a");
    function Page() {
      return null;
    }

    scoped.registerRoute("/plugin-a", Page);

    const routes = pluginRegistry.getRoutes();
    expect(routes).toContainEqual({
      pluginId: "plugin-a",
      path: "/plugin-a",
      Component: Page,
      options: undefined,
    });
  });

  it("registers and returns a nav item", () => {
    const scoped = pluginRegistry.forPlugin("plugin-a");

    scoped.registerNavItem({ id: "nav-a", label: "A", path: "/plugin-a" });

    expect(pluginRegistry.getNavItems()).toContainEqual({
      id: "nav-a",
      label: "A",
      path: "/plugin-a",
    });
  });

  it("registers and returns a settings route", () => {
    const scoped = pluginRegistry.forPlugin("plugin-a");
    function Settings() {
      return null;
    }

    scoped.registerSettingsRoute("/settings/plugins/plugin-a", Settings);

    expect(pluginRegistry.getSettingsRoutes()).toContainEqual({
      path: "/settings/plugins/plugin-a",
      Component: Settings,
    });
  });

  it("registers a slot component and only returns it for the matching slot", () => {
    const scoped = pluginRegistry.forPlugin("plugin-a");
    function Sidebar() {
      return null;
    }

    scoped.registerComponent(TASK_SIDEBAR_SLOT, Sidebar);

    expect(pluginRegistry.getSlotComponents(TASK_SIDEBAR_SLOT)).toEqual([Sidebar]);
    expect(pluginRegistry.getSlotComponents("settings-nav")).toEqual([]);
  });

  it("returns slot registrations with stable owner and registration identity", () => {
    const scopedA = pluginRegistry.forPlugin("plugin-a");
    function Sidebar() {
      return null;
    }

    scopedA.registerComponent(TASK_SIDEBAR_SLOT, Sidebar);

    const [registration] = pluginRegistry.getSlotRegistrations(TASK_SIDEBAR_SLOT);

    expect(registration).toEqual({
      registrationId: expect.any(String),
      orderingId: expect.any(String),
      pluginId: "plugin-a",
      Component: Sidebar,
    });

    scopedA.registerComponent(TASK_SIDEBAR_SLOT, () => null);

    expect(pluginRegistry.getSlotRegistrations(TASK_SIDEBAR_SLOT)[0]?.registrationId).toBe(
      registration?.registrationId,
    );
  });

  it("restores deterministic ordering identities after plugin re-enable", () => {
    function First() {
      return null;
    }
    function Second() {
      return null;
    }
    const scoped = pluginRegistry.forPlugin("plugin-a");
    scoped.registerComponent(APP_STATUS_LEFT_SLOT, First);
    scoped.registerComponent(APP_STATUS_LEFT_SLOT, Second);
    const before = pluginRegistry
      .getSlotRegistrations(APP_STATUS_LEFT_SLOT)
      .map((registration) => registration.orderingId);

    pluginRegistry.unregisterPlugin("plugin-a");
    const reenabled = pluginRegistry.forPlugin("plugin-a");
    reenabled.registerComponent(APP_STATUS_LEFT_SLOT, First);
    reenabled.registerComponent(APP_STATUS_LEFT_SLOT, Second);

    expect(pluginRegistry.getSlotRegistrations(APP_STATUS_LEFT_SLOT)).toMatchObject([
      { orderingId: before[0], pluginId: "plugin-a", Component: First },
      { orderingId: before[1], pluginId: "plugin-a", Component: Second },
    ]);
    expect(before[0]).not.toBe(before[1]);
  });
});

describe("pluginRegistry — lifecycle", () => {
  afterEach(() => {
    cleanup("plugin-a", "plugin-b");
  });

  it("registers a WS handler and only returns it for the matching action", () => {
    const scoped = pluginRegistry.forPlugin("plugin-a");
    const handler = () => {};

    scoped.registerWsHandler(TASK_CREATED_ACTION, handler);

    expect(pluginRegistry.getWsHandlers(TASK_CREATED_ACTION)).toEqual([handler]);
    expect(pluginRegistry.getWsHandlers("task.deleted")).toEqual([]);
  });

  it("bulk-revokes every registration owned by a plugin on unregisterPlugin", () => {
    const scopedA = pluginRegistry.forPlugin("plugin-a");
    const scopedB = pluginRegistry.forPlugin("plugin-b");
    function PageA() {
      return null;
    }
    function PageB() {
      return null;
    }

    scopedA.registerRoute("/plugin-a", PageA);
    scopedA.registerNavItem({ id: "nav-a", label: "A", path: "/plugin-a" });
    scopedA.registerComponent(TASK_SIDEBAR_SLOT, PageA);
    scopedA.registerWsHandler(TASK_CREATED_ACTION, () => {});
    scopedB.registerRoute("/plugin-b", PageB);

    pluginRegistry.unregisterPlugin("plugin-a");

    expect(pluginRegistry.getRoutes()).toEqual([
      { pluginId: "plugin-b", path: "/plugin-b", Component: PageB, options: undefined },
    ]);
    expect(pluginRegistry.getNavItems().find((item) => item.id === "nav-a")).toBeUndefined();
    expect(pluginRegistry.getSlotComponents(TASK_SIDEBAR_SLOT)).toEqual([]);
    expect(pluginRegistry.getWsHandlers(TASK_CREATED_ACTION)).toEqual([]);
  });

  it("notifies subscribers when a registration is added", () => {
    const scoped = pluginRegistry.forPlugin("plugin-a");
    let notified = 0;
    const unsubscribe = pluginRegistry.subscribe(() => {
      notified += 1;
    });

    scoped.registerNavItem({ id: "nav-a", label: "A", path: "/plugin-a" });

    unsubscribe();
    expect(notified).toBe(1);
  });

  it("does not notify subscribers when unregistering a plugin with no registrations", () => {
    let notified = 0;
    const unsubscribe = pluginRegistry.subscribe(() => {
      notified += 1;
    });

    pluginRegistry.unregisterPlugin("plugin-with-nothing-registered");

    unsubscribe();
    expect(notified).toBe(0);
  });
});

describe("pluginRegistry — route options and plugin names", () => {
  afterEach(() => {
    cleanup("plugin-a");
  });

  it("stores route options and the plugin display name for page chrome", () => {
    const scoped = pluginRegistry.forPlugin("plugin-a", "Plugin A");
    function Page() {
      return null;
    }

    scoped.registerRoute("/plugin-a", Page, { topbar: { title: "Custom", icon: "ticket" } });

    const route = pluginRegistry.getRoutes().find((entry) => entry.path === "/plugin-a");
    expect(route?.options).toEqual({ topbar: { title: "Custom", icon: "ticket" } });
    expect(pluginRegistry.getPluginName("plugin-a")).toBe("Plugin A");
  });

  it("clears the plugin display name on unregisterPlugin", () => {
    pluginRegistry.forPlugin("plugin-a", "Plugin A");
    expect(pluginRegistry.getPluginName("plugin-a")).toBe("Plugin A");

    pluginRegistry.unregisterPlugin("plugin-a");

    expect(pluginRegistry.getPluginName("plugin-a")).toBeUndefined();
  });
});