import { 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 NotificationsPage from "@/app/(protected)/notifications";
import { NotificationBell } from "@/components/notifications/notification-bell";
import { NotificationSessionProvider } from "@/domain/notifications/session/notification-session-provider";
import { renderWithProviders } from "@/test/test-utils";

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

vi.mock("@/api/api", () => ({ apiGet }));

type ItemInput = {
  id: string;
  reason: string;
  severity: "Critical" | "High" | "Medium" | "Low";
  title: string;
  count?: number;
  rowType?: "dismissable" | "acknowledge";
  target: { kind: "workOrder" | "queue"; workOrderId?: number; tab?: string; queue?: string };
};

function item(input: ItemInput) {
  return {
    rowType: "dismissable" as ItemInput["rowType"],
    count: 1,
    triggeredAt: "2026-09-18T12:00:00Z",
    workOrders: [],
    ...input,
  };
}

function section(reason: string, label: string, items: ReturnType<typeof item>[]) {
  const severity = items[0]?.severity ?? "Low";
  return {
    reason,
    label,
    severity,
    count: items.reduce((sum, row) => sum + row.count, 0),
    items,
  };
}

const unassigned = item({
  id: "unassigned",
  reason: "unassigned",
  severity: "High",
  title: "3 work orders are unassigned",
  count: 3,
  target: { kind: "queue", queue: "unassigned" },
});

const avetaFirst = item({
  id: "aveta-missing-41",
  reason: "aveta-missing",
  severity: "Medium",
  title: "WO #1041 is missing the Aveta document",
  target: { kind: "workOrder", workOrderId: 41, tab: "extras" },
});

const avetaSecond = item({
  id: "aveta-missing-42",
  reason: "aveta-missing",
  severity: "Medium",
  title: "WO #1042 is missing the Aveta document",
  target: { kind: "workOrder", workOrderId: 42, tab: "extras" },
});

const noVendor = item({
  id: "no-vendor-7",
  reason: "no-vendor",
  severity: "Medium",
  title: "WO #1007 starts within 48h with no vendor assigned",
  target: { kind: "workOrder", workOrderId: 7, tab: "info" },
});

const acknowledgeRow = item({
  id: "sla-9",
  reason: "sla",
  severity: "Critical",
  rowType: "acknowledge",
  title: "WO #1009 missed its response deadline",
  target: { kind: "workOrder", workOrderId: 9, tab: "info" },
});

function feed(...sections: ReturnType<typeof section>[]) {
  return { generatedAt: "2026-09-18T12:00:00Z", sections };
}

const standardFeed = feed(
  section("unassigned", "Unassigned", [unassigned]),
  section("no-vendor", "No Vendor", [noVendor]),
  section("aveta-missing", "Aveta Missing", [avetaFirst, avetaSecond]),
);

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

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

async function openPanel(user: ReturnType<typeof userEvent.setup>) {
  await user.click(await screen.findByRole("button", { name: /^Notifications, \d+ unread$/ }));
  return screen.findByRole("dialog");
}

function sectionLabels(panel: HTMLElement) {
  return within(panel)
    .getAllByRole("region")
    .map((region) => region.getAttribute("aria-label"));
}

describe("notification center", () => {
  beforeEach(() => {
    apiGet.mockReset();
    apiGet.mockResolvedValue(standardFeed);
  });

  it("requests the signed-in user's feed and counts every unread item on the bell", async () => {
    renderBell();

    expect(
      await screen.findByRole("button", { name: "Notifications, 4 unread" }),
    ).toBeInTheDocument();
    expect(apiGet).toHaveBeenCalledWith("notifications");
  });

  it("shows labeled sections with live counts in severity then reason order", async () => {
    const user = userEvent.setup();
    renderBell();

    const panel = await openPanel(user);

    expect(sectionLabels(panel)).toEqual(["Unassigned, 3", "No Vendor, 1", "Aveta Missing, 2"]);
    const aveta = within(panel).getByRole("region", { name: "Aveta Missing, 2" });
    expect(within(aveta).getByRole("heading", { name: "Aveta Missing" })).toBeInTheDocument();
    expect(within(aveta).getAllByRole("listitem")).toHaveLength(2);
  });

  it("never renders an empty section and shows the empty state when nothing is left", async () => {
    apiGet.mockResolvedValue(
      feed(section("unassigned", "Unassigned", [unassigned]), section("due-soon", "Due Soon", [])),
    );
    const user = userEvent.setup();
    renderBell();

    const panel = await openPanel(user);
    expect(sectionLabels(panel)).toEqual(["Unassigned, 3"]);

    await user.click(within(panel).getByRole("button", { name: "Dismiss notification" }));

    expect(within(panel).queryAllByRole("region")).toHaveLength(0);
    expect(within(panel).getByText("Nothing needs your attention")).toBeInTheDocument();
    expect(screen.getByRole("button", { name: "Notifications", hidden: true })).toBeInTheDocument();
  });

  it("styles unread rows apart from read ones and marks everything read on request", async () => {
    const user = userEvent.setup();
    renderBell();

    const panel = await openPanel(user);
    const rows = within(panel).getAllByRole("listitem");
    expect(rows.every((row) => row.dataset.unread === "true")).toBe(true);
    expect(within(panel).getAllByText("Unread:", { exact: false })).toHaveLength(4);

    await user.click(within(panel).getByRole("button", { name: "Mark all read" }));

    expect(
      within(panel)
        .getAllByRole("listitem")
        .every((row) => row.dataset.unread === "false"),
    ).toBe(true);
    expect(within(panel).queryByText("Unread:", { exact: false })).not.toBeInTheDocument();
    expect(within(panel).getByRole("button", { name: "Mark all read" })).toBeDisabled();
    expect(screen.getByRole("button", { name: "Notifications", hidden: true })).toBeInTheDocument();
  });

  it("dismisses one item, lowering its section count, and keeps the dismissal to this session only", async () => {
    const user = userEvent.setup();
    const { unmount } = renderBell();

    const panel = await openPanel(user);
    const aveta = within(panel).getByRole("region", { name: "Aveta Missing, 2" });
    const firstRow = within(aveta).getByText(avetaFirst.title).closest("li");
    expect(firstRow).not.toBeNull();
    await user.click(
      within(firstRow as HTMLElement).getByRole("button", { name: "Dismiss notification" }),
    );

    expect(within(panel).getByRole("region", { name: "Aveta Missing, 1" })).toBeInTheDocument();
    expect(within(panel).queryByText(avetaFirst.title)).not.toBeInTheDocument();
    expect(within(panel).getByText(avetaSecond.title)).toBeInTheDocument();

    unmount();
    renderBell();
    const freshPanel = await openPanel(user);
    expect(within(freshPanel).getByText(avetaFirst.title)).toBeInTheDocument();
  });

  it("re-sorts sections after a dismissal changes which severity leads", async () => {
    apiGet.mockResolvedValue(
      feed(
        section("aveta-missing", "Aveta Missing", [
          item({ ...avetaFirst, severity: "High", title: "WO #1041 urgent" }),
          avetaSecond,
        ]),
        section("no-vendor", "No Vendor", [noVendor]),
      ),
    );
    const user = userEvent.setup();
    renderBell();

    const panel = await openPanel(user);
    expect(sectionLabels(panel)).toEqual(["Aveta Missing, 2", "No Vendor, 1"]);

    const highRow = within(panel).getByText("WO #1041 urgent").closest("li") as HTMLElement;
    await user.click(within(highRow).getByRole("button", { name: "Dismiss notification" }));

    expect(sectionLabels(panel)).toEqual(["No Vendor, 1", "Aveta Missing, 1"]);
  });

  it("clears every dismissable item but keeps rows that need acknowledging", async () => {
    apiGet.mockResolvedValue(
      feed(
        section("sla", "SLA at Risk", [acknowledgeRow]),
        section("unassigned", "Unassigned", [unassigned]),
      ),
    );
    const user = userEvent.setup();
    renderBell();

    const panel = await openPanel(user);
    const slaRow = within(panel).getByText(acknowledgeRow.title).closest("li") as HTMLElement;
    expect(within(slaRow).queryByRole("button", { name: "Dismiss notification" })).toBeNull();

    await user.click(within(panel).getByRole("button", { name: "Clear all" }));

    expect(sectionLabels(panel)).toEqual(["SLA at Risk, 1"]);
    expect(within(panel).getByText(acknowledgeRow.title)).toBeInTheDocument();
  });

  it("opens the unassigned queue with the existing board filters and closes the panel", async () => {
    const user = userEvent.setup();
    renderBell();

    const panel = await openPanel(user);
    await user.click(within(panel).getByRole("button", { name: /3 work orders are unassigned/ }));

    await waitFor(() => expect(screen.queryByRole("dialog")).not.toBeInTheDocument());
    const location = screen.getByRole("status", { name: "Current location" }).textContent ?? "";
    const url = new URL(location, "http://localhost");
    expect(url.pathname).toBe("/workorders");
    expect(url.searchParams.get("dispatchers")).toBe("__unassigned");
    expect(url.searchParams.get("dateFrom")).toBe("1970-01-01");
    expect(url.searchParams.get("dateTo")).toBe("2099-12-31");
    expect(url.searchParams.get("statuses")).toBeTruthy();
    expect(screen.getByRole("button", { name: "Notifications, 3 unread" })).toBeInTheDocument();
  });

  it("opens an Aveta item on that work order's upload tab", async () => {
    const user = userEvent.setup();
    renderBell();

    const panel = await openPanel(user);
    await user.click(within(panel).getByRole("button", { name: new RegExp(avetaSecond.title) }));

    await waitFor(() => expect(screen.queryByRole("dialog")).not.toBeInTheDocument());
    expect(screen.getByRole("status", { name: "Current location" })).toHaveTextContent(
      "/workorders?wo=42&tab=extras",
    );
  });

  it("serves the same feed as a full page", async () => {
    const user = userEvent.setup();
    renderWithProviders(
      <NotificationSessionProvider>
        <NotificationsPage />
        <LocationProbe />
      </NotificationSessionProvider>,
      { withAuth: false, route: "/notifications" },
    );

    expect(await screen.findByRole("region", { name: "No Vendor, 1" })).toBeInTheDocument();
    expect(screen.getByRole("heading", { name: "Notifications" })).toBeInTheDocument();

    await user.click(screen.getByRole("button", { name: new RegExp(noVendor.title) }));

    expect(screen.getByRole("status", { name: "Current location" })).toHaveTextContent(
      "/workorders?wo=7&tab=info",
    );
  });

  it("tells the user when the feed cannot load", async () => {
    apiGet.mockRejectedValue(new Error("boom"));
    renderWithProviders(
      <NotificationSessionProvider>
        <NotificationsPage />
      </NotificationSessionProvider>,
      { withAuth: false, route: "/notifications" },
    );

    expect(
      await screen.findByText("Notifications could not be loaded. They will retry automatically."),
    ).toBeInTheDocument();
  });
});