import { act, screen, waitFor, within } from "@testing-library/react";
import userEvent from "@testing-library/user-event";
import { useLocation } from "react-router";
import { beforeEach, describe, expect, it, vi } from "vitest";

import { SlaAtRiskBanner } from "@/components/notifications/sla-at-risk-banner";
import { NotificationSessionProvider } from "@/domain/notifications/session/notification-session-provider";
import { queryKeys } from "@/infra/query-key/query-key";
import { renderWithProviders } from "@/test/test-utils";

const apiGet = vi.hoisted(() => vi.fn());
const toastWarn = vi.hoisted(() => vi.fn());

vi.mock("@/api/api", () => ({ apiGet }));
vi.mock("react-toastify", () => ({ toast: { warn: toastWarn } }));

const BANNER = "Work orders at risk of missing their response deadline";

function atRisk(id: number, number: string | null = String(1000 + id)) {
  return {
    id,
    number,
    severity: 1,
    startedAt: "2026-09-18T10:00:00Z",
    deadlineAt: "2026-09-18T12:00:00Z",
    percentElapsed: 60,
  };
}

function feed(...slaAtRisk: ReturnType<typeof atRisk>[]) {
  return { generatedAt: "2026-09-18T11:12:00Z", sections: [], slaAtRisk };
}

function LocationProbe() {
  const location = useLocation();
  return <output aria-label="Current location">{`${location.pathname}${location.search}`}</output>;
}

function renderBanner() {
  return renderWithProviders(
    <NotificationSessionProvider>
      <SlaAtRiskBanner />
      <LocationProbe />
    </NotificationSessionProvider>,
    { withAuth: false },
  );
}

describe("SLA at-risk banner", () => {
  beforeEach(() => {
    apiGet.mockReset();
    toastWarn.mockReset();
  });

  it("stays hidden while no work order is past half of its response window", async () => {
    apiGet.mockResolvedValue(feed());
    renderBanner();

    await waitFor(() => expect(apiGet).toHaveBeenCalledWith("notifications"));
    expect(screen.queryByRole("region", { name: BANNER })).not.toBeInTheDocument();
    expect(toastWarn).not.toHaveBeenCalled();
  });

  it("names the single work order at risk", async () => {
    apiGet.mockResolvedValue(feed(atRisk(101)));
    renderBanner();

    const banner = await screen.findByRole("region", { name: BANNER });
    expect(
      within(banner).getByRole("button", {
        name: "WO #1101 is at risk of missing its response deadline",
      }),
    ).toBeInTheDocument();
  });

  it("collapses several work orders to one line and opens Work Orders on exactly those", async () => {
    apiGet.mockResolvedValue(feed(atRisk(101), atRisk(205), atRisk(318)));
    const user = userEvent.setup();
    renderBanner();

    const banner = await screen.findByRole("region", { name: BANNER });
    const open = within(banner).getByRole("button", {
      name: "3 work orders are at risk of missing their response deadline",
    });
    expect(open).toHaveAttribute("title", "View in Work Orders");
    expect(within(banner).getAllByRole("button")).toHaveLength(2);

    await user.click(open);

    expect(screen.getByRole("status", { name: "Current location" })).toHaveTextContent(
      "/workorders?ids=101,205,318",
    );
  });

  it("dismisses for this session only and returns when a new work order becomes at risk", async () => {
    apiGet.mockResolvedValue(feed(atRisk(101), atRisk(205)));
    const user = userEvent.setup();
    const { queryClient, unmount } = renderBanner();

    const banner = await screen.findByRole("region", { name: BANNER });
    await user.click(within(banner).getByRole("button", { name: "Dismiss SLA alert" }));
    expect(screen.queryByRole("region", { name: BANNER })).not.toBeInTheDocument();

    apiGet.mockResolvedValue(feed(atRisk(101), atRisk(205), atRisk(318)));
    await act(() => queryClient.invalidateQueries({ queryKey: queryKeys.notifications.feed() }));

    const returned = await screen.findByRole("region", { name: BANNER });
    expect(
      within(returned).getByRole("button", {
        name: "WO #1318 is at risk of missing its response deadline",
      }),
    ).toBeInTheDocument();

    unmount();
    renderBanner();
    expect(
      await screen.findByRole("button", {
        name: "3 work orders are at risk of missing their response deadline",
      }),
    ).toBeInTheDocument();
  });

  it("toasts each work order once per session, however often the feed polls", async () => {
    apiGet.mockResolvedValue(feed(atRisk(101), atRisk(205, null)));
    const { queryClient } = renderBanner();

    await screen.findByRole("region", { name: BANNER });
    expect(toastWarn).toHaveBeenCalledTimes(2);
    expect(toastWarn).toHaveBeenCalledWith("WO #1101 is at 50% of its SLA response window", {
      toastId: "sla-at-risk-101",
    });
    expect(toastWarn).toHaveBeenCalledWith("WO 205 is at 50% of its SLA response window", {
      toastId: "sla-at-risk-205",
    });

    apiGet.mockResolvedValue(feed(atRisk(101), atRisk(205, null), atRisk(318)));
    await act(() => queryClient.invalidateQueries({ queryKey: queryKeys.notifications.feed() }));
    await screen.findByRole("button", {
      name: "3 work orders are at risk of missing their response deadline",
    });
    await act(() => queryClient.invalidateQueries({ queryKey: queryKeys.notifications.feed() }));

    expect(toastWarn).toHaveBeenCalledTimes(3);
    expect(toastWarn).toHaveBeenLastCalledWith("WO #1318 is at 50% of its SLA response window", {
      toastId: "sla-at-risk-318",
    });
  });
});