import { describe, it, expect, vi, beforeEach, afterEach } from "vitest";
import { render, screen, fireEvent, waitFor } from "@testing-library/react";
import { parseTimeTo24Hour, isUpcoming, normalizeAppointment, CustomerNotesSection, ConfirmationSection, StatusBadge } from "../portal/sections/Appointments.tsx";

const UPCOMING_APPT = {
  id: "appt-1",
  petId: "pet-1",
  petName: "Buddy",
  groomerId: "groomer-1",
  groomerName: "Sarah",
  services: ["Bath & Brush"],
  serviceId: "service-1",
  addOns: [],
  date: "2027-01-01",
  time: "10:00 AM",
  duration: 60,
  price: 50,
  status: "confirmed" as const,
  notes: "",
  customerNotes: "",
  confirmationStatus: "pending" as const,
};

const PAST_APPT = {
  ...UPCOMING_APPT,
  id: "appt-2",
  date: "2025-01-01",
  time: "10:00 AM",
  status: "completed" as const,
};

describe("parseTimeTo24Hour", () => {
  it("converts AM times correctly", () => {
    expect(parseTimeTo24Hour("9:00 AM")).toBe("09:00:00");
    expect(parseTimeTo24Hour("10:00 AM")).toBe("10:00:00");
    expect(parseTimeTo24Hour("12:00 AM")).toBe("00:00:00");
  });

  it("converts PM times correctly", () => {
    expect(parseTimeTo24Hour("1:00 PM")).toBe("13:00:00");
    expect(parseTimeTo24Hour("2:00 PM")).toBe("14:00:00");
    expect(parseTimeTo24Hour("11:00 PM")).toBe("23:00:00");
    expect(parseTimeTo24Hour("12:00 PM")).toBe("12:00:00");
  });

  it("does not throw on undefined/null/empty input (GRO-2180)", () => {
    expect(() => parseTimeTo24Hour(undefined)).not.toThrow();
    expect(() => parseTimeTo24Hour(null)).not.toThrow();
    expect(parseTimeTo24Hour(undefined)).toBe("00:00:00");
    expect(parseTimeTo24Hour("")).toBe("00:00:00");
  });
});

// GRO-2180: `/api/portal/appointments` returns ISO `startTime`/`endTime` + nested
// pet/service/staff objects, not the flat date/time/petName shape the UI renders.
describe("normalizeAppointment (API startTime shape — GRO-2180)", () => {
  const RAW_API_APPT = {
    id: "a0000001-0000-0000-0000-000000000001",
    startTime: "2026-06-01T10:00:00.000Z",
    endTime: "2026-06-01T10:45:00.000Z",
    status: "completed" as const,
    confirmationStatus: "confirmed" as const,
    customerNotes: "Please be gentle",
    notes: null,
    pet: { id: "c0000001-0000-0000-0000-000000000001", name: "UAT Pup Alpha", photo: null },
    service: { id: "b0000001-0000-0000-0000-000000000001", name: "Full Groom" },
    staff: { id: "00000000-0000-0000-0000-000000000004", name: "UAT Staff Groomer" },
  };

  it("maps nested pet/service/staff and ISO startTime without throwing", () => {
    const appt = normalizeAppointment(RAW_API_APPT);
    expect(appt.id).toBe("a0000001-0000-0000-0000-000000000001");
    expect(appt.petId).toBe("c0000001-0000-0000-0000-000000000001");
    expect(appt.serviceId).toBe("b0000001-0000-0000-0000-000000000001");
    expect(appt.groomerId).toBe("00000000-0000-0000-0000-000000000004");
    expect(appt.petName).toBe("UAT Pup Alpha");
    expect(appt.serviceName).toBe("Full Groom");
    expect(appt.groomerName).toBe("UAT Staff Groomer");
    expect(appt.startTime).toBe("2026-06-01T10:00:00.000Z");
    expect(appt.customerNotes).toBe("Please be gentle");
  });

  it("derives duration in minutes from start/end delta", () => {
    expect(normalizeAppointment(RAW_API_APPT).duration).toBe(45);
  });

  it("produces a date/time pair that does not crash isUpcoming or formatDate", () => {
    const appt = normalizeAppointment(RAW_API_APPT);
    expect(typeof appt.date).toBe("string");
    expect(typeof appt.time).toBe("string");
    expect(() => isUpcoming(appt)).not.toThrow();
  });

  it("classifies a past completed appointment as not upcoming", () => {
    expect(isUpcoming(normalizeAppointment(RAW_API_APPT))).toBe(false);
  });

  it("classifies a future scheduled appointment as upcoming via startTime", () => {
    const future = normalizeAppointment({
      ...RAW_API_APPT,
      startTime: "2099-01-01T10:00:00.000Z",
      endTime: "2099-01-01T11:00:00.000Z",
      status: "confirmed",
    });
    expect(isUpcoming(future)).toBe(true);
  });

  it("tolerates null nested objects without throwing", () => {
    const appt = normalizeAppointment({
      id: "a2",
      startTime: "2099-01-01T10:00:00.000Z",
      endTime: "2099-01-01T11:00:00.000Z",
      status: "scheduled",
      pet: null,
      service: null,
      staff: null,
    });
    expect(appt.petId).toBe("");
    expect(appt.serviceId).toBe("");
    expect(appt.groomerId).toBeNull();
    expect(appt.petName).toBeUndefined();
  });
});

describe("isUpcoming", () => {
  it("returns true for future confirmed appointments", () => {
    expect(isUpcoming(UPCOMING_APPT)).toBe(true);
  });

  it("returns false for past appointments", () => {
    expect(isUpcoming(PAST_APPT)).toBe(false);
  });

  it("returns false for cancelled appointments", () => {
    expect(isUpcoming({ ...UPCOMING_APPT, status: "cancelled" })).toBe(false);
  });

  it("returns false for completed appointments", () => {
    expect(isUpcoming({ ...UPCOMING_APPT, status: "completed" })).toBe(false);
  });
});

describe("CustomerNotesSection", () => {
  beforeEach(() => {
    vi.clearAllMocks();
    global.fetch = vi.fn();
  });

  it("renders textarea with existing notes", () => {
    render(<CustomerNotesSection appointment={{ ...UPCOMING_APPT, customerNotes: "Test note" }} sessionId="test-session-id" />);
    expect(screen.getByRole("textbox")).toHaveValue("Test note");
  });

  it("renders Save Notes button", () => {
    render(<CustomerNotesSection appointment={UPCOMING_APPT} sessionId="test-session-id" />);
    expect(screen.getByRole("button", { name: /Save Notes/i })).toBeInTheDocument();
  });

  it("sends Authorization header when session exists", async () => {
    vi.mocked(global.fetch).mockResolvedValue({
      ok: true,
      json: async () => ({ id: "appt-1", customerNotes: "Updated", updatedAt: new Date().toISOString() }),
    } as Response);

    render(<CustomerNotesSection appointment={UPCOMING_APPT} sessionId="test-session-id" />);
    fireEvent.change(screen.getByRole("textbox"), { target: { value: "New note" } });
    fireEvent.click(screen.getByRole("button", { name: /Save Notes/i }));

    await waitFor(() => {
      expect(global.fetch).toHaveBeenCalledWith(
        "/api/portal/appointments/appt-1/notes",
        expect.objectContaining({
          headers: expect.objectContaining({
            "X-Impersonation-Session-Id": "test-session-id",
          }),
        })
      );
    });
  });

  it("does not send Authorization header when sessionId is null", async () => {
    vi.mocked(global.fetch).mockResolvedValue({
      ok: true,
      json: async () => ({ id: "appt-1", customerNotes: "Updated", updatedAt: new Date().toISOString() }),
    } as Response);

    render(<CustomerNotesSection appointment={UPCOMING_APPT} sessionId={null} />);
    fireEvent.change(screen.getByRole("textbox"), { target: { value: "New note" } });
    fireEvent.click(screen.getByRole("button", { name: /Save Notes/i }));

    await waitFor(() => {
      expect(global.fetch).toHaveBeenCalledWith(
        "/api/portal/appointments/appt-1/notes",
        expect.objectContaining({
          headers: expect.not.objectContaining({
            "Authorization": expect.anything(),
          }),
        })
      );
    });
  });

  it("shows error message when save fails", async () => {
    vi.mocked(global.fetch).mockResolvedValue({
      ok: false,
      status: 401,
      json: async () => ({ error: "Unauthorized" }),
    } as Response);

    render(<CustomerNotesSection appointment={UPCOMING_APPT} sessionId="test-session-id" />);
    fireEvent.change(screen.getByRole("textbox"), { target: { value: "New note" } });
    fireEvent.click(screen.getByRole("button", { name: /Save Notes/i }));

    await waitFor(() => {
      expect(screen.getByText(/Unauthorized/i)).toBeInTheDocument();
    });
  });

  it("shows success message when save succeeds", async () => {
    vi.mocked(global.fetch).mockResolvedValue({
      ok: true,
      json: async () => ({ id: "appt-1", customerNotes: "Saved", updatedAt: new Date().toISOString() }),
    } as Response);

    render(<CustomerNotesSection appointment={UPCOMING_APPT} sessionId="test-session-id" />);
    fireEvent.change(screen.getByRole("textbox"), { target: { value: "Saved note" } });
    fireEvent.click(screen.getByRole("button", { name: /Save Notes/i }));

    await waitFor(() => {
      expect(screen.getByText(/Saved!/i)).toBeInTheDocument();
    });
  });

  it("disables button when notes unchanged", () => {
    render(<CustomerNotesSection appointment={{ ...UPCOMING_APPT, customerNotes: "Existing" }} sessionId="test-session-id" />);
    expect(screen.getByRole("button", { name: /Save Notes/i })).toBeDisabled();
  });

  it("enforces 500 character limit", () => {
    render(<CustomerNotesSection appointment={UPCOMING_APPT} sessionId="test-session-id" />);
    const textarea = screen.getByRole("textbox");
    const longText = "a".repeat(600);
    fireEvent.change(textarea, { target: { value: longText } });
    expect(textarea).toHaveValue("a".repeat(500));
  });

  it("displays character count", () => {
    render(<CustomerNotesSection appointment={UPCOMING_APPT} sessionId="test-session-id" />);
    expect(screen.getByText(/0\/500/)).toBeInTheDocument();
  });

  it("shows exceeded character count in red when limit exceeded", () => {
    render(<CustomerNotesSection appointment={UPCOMING_APPT} sessionId="test-session-id" />);
    const textarea = screen.getByRole("textbox");
    // Type characters one by one to exceed limit
    const longText = "a".repeat(501);
    fireEvent.change(textarea, { target: { value: longText } });
    // The textarea value is truncated to 500, so counter shows 500/500
    // The class check would need to verify text-red-500 appears
    // Since the onChange truncates, we test that limit is enforced
    expect(textarea).toHaveValue("a".repeat(500));
  });

  it("does not render save button for completed appointments", () => {
    render(<CustomerNotesSection appointment={{ ...UPCOMING_APPT, status: "completed" }} sessionId="test-session-id" />);
    expect(screen.queryByRole("button", { name: /Save Notes/i })).not.toBeInTheDocument();
  });

  it("does not render save button for cancelled appointments", () => {
    render(<CustomerNotesSection appointment={{ ...UPCOMING_APPT, status: "cancelled" }} sessionId="test-session-id" />);
    expect(screen.queryByRole("button", { name: /Save Notes/i })).not.toBeInTheDocument();
  });
});

describe("ConfirmationSection", () => {
  beforeEach(() => {
    vi.clearAllMocks();
    global.fetch = vi.fn();
    vi.stubGlobal("confirm", vi.fn(() => true));
  });

  afterEach(() => {
    vi.restoreAllMocks();
  });

  it("renders pending badge when confirmationStatus is pending", () => {
    render(<ConfirmationSection appointment={UPCOMING_APPT} sessionId="test-session-id" />);
    expect(screen.getByText("Pending confirmation")).toBeInTheDocument();
  });

  it("renders confirmed badge when confirmationStatus is confirmed", () => {
    render(<ConfirmationSection appointment={{ ...UPCOMING_APPT, confirmationStatus: "confirmed" }} sessionId="test-session-id" />);
    expect(screen.getByText("Confirmed")).toBeInTheDocument();
  });

  it("renders cancelled badge when confirmationStatus is cancelled", () => {
    render(<ConfirmationSection appointment={{ ...UPCOMING_APPT, confirmationStatus: "cancelled" }} sessionId="test-session-id" />);
    expect(screen.getByText("Cancelled")).toBeInTheDocument();
  });

  it("shows Confirm Appointment button when status is pending", () => {
    render(<ConfirmationSection appointment={UPCOMING_APPT} sessionId="test-session-id" />);
    expect(screen.getByRole("button", { name: /Confirm Appointment/i })).toBeInTheDocument();
  });

  it("does not show Confirm button when already confirmed", () => {
    render(<ConfirmationSection appointment={{ ...UPCOMING_APPT, confirmationStatus: "confirmed" }} sessionId="test-session-id" />);
    expect(screen.queryByRole("button", { name: /Confirm Appointment/i })).not.toBeInTheDocument();
  });

  it("does not show Confirm button when cancelled", () => {
    render(<ConfirmationSection appointment={{ ...UPCOMING_APPT, confirmationStatus: "cancelled" }} sessionId="test-session-id" />);
    expect(screen.queryByRole("button", { name: /Confirm Appointment/i })).not.toBeInTheDocument();
  });

  it("calls confirm API and updates local status on success", async () => {
    vi.mocked(global.fetch).mockResolvedValue({
      ok: true,
      json: async () => ({ id: "appt-1", confirmationStatus: "confirmed" }),
    } as Response);

    render(<ConfirmationSection appointment={UPCOMING_APPT} sessionId="test-session-id" />);
    fireEvent.click(screen.getByRole("button", { name: /Confirm Appointment/i }));

    await waitFor(() => {
      expect(global.fetch).toHaveBeenCalledWith(
        "/api/portal/appointments/appt-1/confirm",
        expect.objectContaining({ method: "POST" })
      );
    });
    await waitFor(() => {
      expect(screen.getByText("Confirmed")).toBeInTheDocument();
    });
  });

  it("sends Authorization header when session exists", async () => {
    vi.mocked(global.fetch).mockResolvedValue({
      ok: true,
      json: async () => ({ id: "appt-1", confirmationStatus: "confirmed" }),
    } as Response);

    render(<ConfirmationSection appointment={UPCOMING_APPT} sessionId="test-session-id" />);
    fireEvent.click(screen.getByRole("button", { name: /Confirm Appointment/i }));

    await waitFor(() => {
      expect(global.fetch).toHaveBeenCalledWith(
        "/api/portal/appointments/appt-1/confirm",
        expect.objectContaining({
          headers: expect.objectContaining({
            "X-Impersonation-Session-Id": "test-session-id",
          }),
        })
      );
    });
  });

  it("does not send Authorization header when sessionId is null", async () => {
    vi.mocked(global.fetch).mockResolvedValue({
      ok: true,
      json: async () => ({ id: "appt-1", confirmationStatus: "confirmed" }),
    } as Response);

    render(<ConfirmationSection appointment={UPCOMING_APPT} sessionId={null} />);
    fireEvent.click(screen.getByRole("button", { name: /Confirm Appointment/i }));

    await waitFor(() => {
      expect(global.fetch).toHaveBeenCalledWith(
        "/api/portal/appointments/appt-1/confirm",
        expect.objectContaining({
          headers: expect.not.objectContaining({
            "Authorization": expect.anything(),
          }),
        })
      );
    });
  });

  it("shows error message when confirm API returns 401", async () => {
    vi.mocked(global.fetch).mockResolvedValue({
      ok: false,
      status: 401,
      json: async () => ({ error: "Unauthorized" }),
    } as Response);

    render(<ConfirmationSection appointment={UPCOMING_APPT} sessionId="test-session-id" />);
    fireEvent.click(screen.getByRole("button", { name: /Confirm Appointment/i }));

    await waitFor(() => {
      expect(screen.getByText(/Unauthorized/i)).toBeInTheDocument();
    });
  });

  it("shows error message when confirm API returns 403", async () => {
    vi.mocked(global.fetch).mockResolvedValue({
      ok: false,
      status: 403,
      json: async () => ({ error: "Forbidden" }),
    } as Response);

    render(<ConfirmationSection appointment={UPCOMING_APPT} sessionId="test-session-id" />);
    fireEvent.click(screen.getByRole("button", { name: /Confirm Appointment/i }));

    await waitFor(() => {
      expect(screen.getByText(/Forbidden/i)).toBeInTheDocument();
    });
  });

  it("shows error message when confirm API returns 422 (invalid state)", async () => {
    vi.mocked(global.fetch).mockResolvedValue({
      ok: false,
      status: 422,
      json: async () => ({ error: "Cannot confirm - appointment is not in pending state" }),
    } as Response);

    render(<ConfirmationSection appointment={UPCOMING_APPT} sessionId="test-session-id" />);
    fireEvent.click(screen.getByRole("button", { name: /Confirm Appointment/i }));

    await waitFor(() => {
      expect(screen.getByText(/Cannot confirm/i)).toBeInTheDocument();
    });
  });

  it("does not call confirm API if user cancels the confirmation dialog", async () => {
    vi.stubGlobal("confirm", vi.fn(() => false));

    render(<ConfirmationSection appointment={UPCOMING_APPT} sessionId="test-session-id" />);
    fireEvent.click(screen.getByRole("button", { name: /Confirm Appointment/i }));

    expect(global.fetch).not.toHaveBeenCalled();
  });

  it("shows loading state while confirming", async () => {
    vi.mocked(global.fetch).mockReturnValue(new Promise(() => {})); // Never resolves

    render(<ConfirmationSection appointment={UPCOMING_APPT} sessionId="test-session-id" />);
    // Get button reference before clicking
    const btn = screen.getByRole("button", { name: /Confirm Appointment/i });
    fireEvent.click(btn);

    await waitFor(() => {
      expect(screen.getByText(/Confirming.../i)).toBeInTheDocument();
    });
    // Button is disabled while loading
    expect(btn).toBeDisabled();
  });

  it("shows success message briefly after confirm", async () => {
    vi.mocked(global.fetch).mockResolvedValue({
      ok: true,
      json: async () => ({ id: "appt-1", confirmationStatus: "confirmed" }),
    } as Response);

    render(<ConfirmationSection appointment={UPCOMING_APPT} sessionId="test-session-id" />);
    fireEvent.click(screen.getByRole("button", { name: /Confirm Appointment/i }));

    await waitFor(() => {
      expect(screen.getByText(/Confirmed!/i)).toBeInTheDocument();
    });
  });
});

describe("StatusBadge", () => {
  it("renders Confirmed for confirmed status", () => {
    render(<StatusBadge status="confirmed" />);
    expect(screen.getByText("Confirmed")).toBeInTheDocument();
  });

  it("renders Pending for pending status", () => {
    render(<StatusBadge status="pending" />);
    expect(screen.getByText("Pending")).toBeInTheDocument();
  });

  it("renders Waitlisted for waitlisted status", () => {
    render(<StatusBadge status="waitlisted" />);
    expect(screen.getByText("Waitlisted")).toBeInTheDocument();
  });

  it("renders Completed for completed status", () => {
    render(<StatusBadge status="completed" />);
    expect(screen.getByText("Completed")).toBeInTheDocument();
  });

  it("renders Cancelled for cancelled status", () => {
    render(<StatusBadge status="cancelled" />);
    expect(screen.getByText("Cancelled")).toBeInTheDocument();
  });

  it("falls back to status string for unknown status", () => {
    render(<StatusBadge status="custom-status" />);
    expect(screen.getByText("custom-status")).toBeInTheDocument();
  });

  it("uses correct CSS class for confirmed status", () => {
    render(<StatusBadge status="confirmed" />);
    const badge = screen.getByText("Confirmed").closest('span');
    expect(badge?.className).toContain("bg-green-100");
    expect(badge?.className).toContain("text-green-700");
  });

  it("uses correct CSS class for waitlisted status", () => {
    render(<StatusBadge status="waitlisted" />);
    const badge = screen.getByText("Waitlisted").closest('span');
    expect(badge?.className).toContain("bg-blue-100");
    expect(badge?.className).toContain("text-blue-600");
  });

  it("uses correct CSS class for pending status", () => {
    render(<StatusBadge status="pending" />);
    const badge = screen.getByText("Pending").closest('span');
    expect(badge?.className).toContain("bg-amber-100");
    expect(badge?.className).toContain("text-amber-600");
  });

  it("uses fallback styling for unknown status", () => {
    render(<StatusBadge status="unknown" />);
    const badge = screen.getByText("unknown").closest('span');
    expect(badge?.className).toContain("bg-stone-100");
    expect(badge?.className).toContain("text-stone-600");
  });
});

describe("RescheduleFlow dynamic time slots", () => {
  beforeEach(() => {
    vi.clearAllMocks();
    global.fetch = vi.fn();
  });

  const RESCHEDULE_APPT = {
    id: "appt-r1",
    petId: "pet-1",
    petName: "Buddy",
    groomerId: "groomer-1",
    groomerName: "Sarah",
    services: ["Bath & Brush"],
    serviceId: "service-1",
    addOns: [],
    date: "2027-01-01",
    time: "10:00 AM",
    duration: 60,
    price: 50,
    status: "confirmed" as const,
    notes: "",
    customerNotes: "",
    confirmationStatus: "confirmed" as const,
  };

  it("shows loading state while fetching availability", async () => {
    vi.mocked(global.fetch).mockReturnValue(new Promise(() => {})); // Never resolves

    const { RescheduleFlow } = await import("../portal/sections/Appointments.tsx");
    render(<RescheduleFlow appointment={RESCHEDULE_APPT} onClose={() => {}} sessionId="test-session-id" />);

    const dateInput = screen.getByLabelText(/date/i) || screen.getByRole("textbox", { name: /date/i });
    fireEvent.change(dateInput, { target: { value: "2027-01-15" } });

    await waitFor(() => {
      expect(screen.getByText(/Checking availability/i)).toBeInTheDocument();
    });
  });

  it("displays fetched time slots from API", async () => {
    vi.mocked(global.fetch).mockResolvedValue({
      ok: true,
      json: async () => ["9:00 AM", "10:00 AM", "2:00 PM"],
    } as Response);

    const { RescheduleFlow } = await import("../portal/sections/Appointments.tsx");
    render(<RescheduleFlow appointment={RESCHEDULE_APPT} onClose={() => {}} sessionId="test-session-id" />);

    const dateInput = screen.getByLabelText(/date/i) || screen.getByRole("textbox", { name: /date/i });
    fireEvent.change(dateInput, { target: { value: "2027-01-15" } });

    await waitFor(() => {
      expect(screen.getByText("9:00 AM")).toBeInTheDocument();
      expect(screen.getByText("10:00 AM")).toBeInTheDocument();
      expect(screen.getByText("2:00 PM")).toBeInTheDocument();
    });
  });

  it("shows error state when availability fetch fails", async () => {
    vi.mocked(global.fetch).mockRejectedValue(new Error("Network error"));

    const { RescheduleFlow } = await import("../portal/sections/Appointments.tsx");
    render(<RescheduleFlow appointment={RESCHEDULE_APPT} onClose={() => {}} sessionId="test-session-id" />);

    const dateInput = screen.getByLabelText(/date/i) || screen.getByRole("textbox", { name: /date/i });
    fireEvent.change(dateInput, { target: { value: "2027-01-15" } });

    await waitFor(() => {
      expect(screen.getByText(/Failed to load time slots/i)).toBeInTheDocument();
    });
  });

  it("shows no slots message when API returns empty array", async () => {
    vi.mocked(global.fetch).mockResolvedValue({
      ok: true,
      json: async () => [] as string[],
    } as Response);

    const { RescheduleFlow } = await import("../portal/sections/Appointments.tsx");
    render(<RescheduleFlow appointment={RESCHEDULE_APPT} onClose={() => {}} sessionId="test-session-id" />);

    const dateInput = screen.getByLabelText(/date/i) || screen.getByRole("textbox", { name: /date/i });
    fireEvent.change(dateInput, { target: { value: "2027-01-15" } });

    await waitFor(() => {
      expect(screen.getByText(/No available slots on this date/i)).toBeInTheDocument();
    });
  });

  it("calls /api/book/availability with the serviceId and selected date", async () => {
    vi.mocked(global.fetch).mockResolvedValue({
      ok: true,
      json: async () => ["9:00 AM"] as string[],
    } as Response);

    const { RescheduleFlow } = await import("../portal/sections/Appointments.tsx");
    render(<RescheduleFlow appointment={RESCHEDULE_APPT} onClose={() => {}} sessionId="test-session-id" />);

    const dateInput = screen.getByLabelText(/date/i) || screen.getByRole("textbox", { name: /date/i });
    fireEvent.change(dateInput, { target: { value: "2027-02-20" } });

    await waitFor(() => {
      expect(global.fetch).toHaveBeenCalledWith(
        "/api/book/availability?serviceId=service-1&date=2027-02-20",
        expect.objectContaining({
          headers: expect.objectContaining({ "X-Impersonation-Session-Id": "test-session-id" }),
        })
      );
    });
  });

  it("shows error message when API returns a 4xx error object instead of an array", async () => {
    vi.mocked(global.fetch).mockResolvedValue({
      ok: false,
      status: 400,
      json: async () => ({ error: "serviceId and date are required" }),
    } as Response);

    const { RescheduleFlow } = await import("../portal/sections/Appointments.tsx");
    render(<RescheduleFlow appointment={RESCHEDULE_APPT} onClose={() => {}} sessionId="test-session-id" />);

    const dateInput = screen.getByLabelText(/date/i) || screen.getByRole("textbox", { name: /date/i });
    fireEvent.change(dateInput, { target: { value: "2027-02-20" } });

    await waitFor(() => {
      expect(screen.getByText(/serviceId and date are required/i)).toBeInTheDocument();
    });
  });

  it("shows generic error when API returns 200 but body is not an array", async () => {
    vi.mocked(global.fetch).mockResolvedValue({
      ok: true,
      json: async () => ({ error: "serviceId and date are required" }),
    } as Response);

    const { RescheduleFlow } = await import("../portal/sections/Appointments.tsx");
    render(<RescheduleFlow appointment={RESCHEDULE_APPT} onClose={() => {}} sessionId="test-session-id" />);

    const dateInput = screen.getByLabelText(/date/i) || screen.getByRole("textbox", { name: /date/i });
    fireEvent.change(dateInput, { target: { value: "2027-02-20" } });

    await waitFor(() => {
      expect(screen.getByText(/Failed to load time slots/i)).toBeInTheDocument();
    });
  });

  it("re-fetches slots when date changes", async () => {
    vi.mocked(global.fetch)
      .mockResolvedValueOnce({
        ok: true,
        json: async () => ["9:00 AM"] as string[],
      } as Response)
      .mockResolvedValueOnce({
        ok: true,
        json: async () => ["11:00 AM", "1:00 PM"] as string[],
      } as Response);

    const { RescheduleFlow } = await import("../portal/sections/Appointments.tsx");
    render(<RescheduleFlow appointment={RESCHEDULE_APPT} onClose={() => {}} sessionId="test-session-id" />);

    const dateInput = screen.getByLabelText(/date/i) || screen.getByRole("textbox", { name: /date/i });

    fireEvent.change(dateInput, { target: { value: "2027-01-10" } });
    await waitFor(() => expect(screen.getByText("9:00 AM")).toBeInTheDocument());

    fireEvent.change(dateInput, { target: { value: "2027-01-15" } });
    await waitFor(() => {
      expect(screen.getByText("11:00 AM")).toBeInTheDocument();
      expect(screen.getByText("1:00 PM")).toBeInTheDocument();
    });
  });
});