import { describe, it, expect, vi, beforeEach } from 'vitest';
import { render, screen, waitFor, fireEvent } from '@testing-library/react';
import type React from 'react';
import userEvent from '@testing-library/user-event';

const { mockUseApi } = vi.hoisted(() => ({ mockUseApi: vi.fn() }));
const { mockUseParams } = vi.hoisted(() => ({ mockUseParams: vi.fn() }));

const {
  mockGetMedicine,
  mockListMedicineProducts,
  mockCreateMedicineProduct,
  mockDeleteMedicineProduct,
  mockUpdateMedicine,
  mockUpdateMedicineProduct,
} = vi.hoisted(() => ({
  mockGetMedicine: vi.fn(),
  mockListMedicineProducts: vi.fn(),
  mockCreateMedicineProduct: vi.fn(),
  mockDeleteMedicineProduct: vi.fn(),
  mockUpdateMedicine: vi.fn(),
  mockUpdateMedicineProduct: vi.fn(),
}));

const { mockListCabinetItems, mockAdjustCabinetItemQuantity, mockDeleteCabinetItem } = vi.hoisted(
  () => ({
    mockListCabinetItems: vi.fn(),
    mockAdjustCabinetItemQuantity: vi.fn(),
    mockDeleteCabinetItem: vi.fn(),
  }),
);

vi.mock('@/lib/useApi', () => ({ useApi: mockUseApi }));
vi.mock('next/navigation', () => ({ useParams: mockUseParams }));
vi.mock('next/link', () => ({
  default: (props: { href?: string; children: React.ReactNode }) => (
    <a href={props.href}>{props.children}</a>
  ),
}));

vi.mock('@/services/medicines', () => ({
  getMedicine: mockGetMedicine,
  listMedicineProducts: mockListMedicineProducts,
  createMedicineProduct: mockCreateMedicineProduct,
  deleteMedicineProduct: mockDeleteMedicineProduct,
  updateMedicine: mockUpdateMedicine,
  updateMedicineProduct: mockUpdateMedicineProduct,
}));

vi.mock('@/services/cabinet', () => ({
  listCabinetItems: mockListCabinetItems,
  adjustCabinetItemQuantity: mockAdjustCabinetItemQuantity,
  deleteCabinetItem: mockDeleteCabinetItem,
}));

import MedicineDetailPage from '../../../../../src/app/(dashboard)/medicines/[id]/page';

const medicine = {
  _id: 'med-1',
  name: 'Metformin',
  form: 'tablet',
  strength: 500,
  strengthUnit: 'mg',
  category: 'prescription',
  notes: '',
  tags: [],
  createdAt: '2026-01-01T00:00:00.000Z',
  updatedAt: '2026-01-01T00:00:00.000Z',
};

const emptyProducts = { data: [], pagination: { cursor: null, hasMore: false } };
const emptyItems = { data: [], pagination: { cursor: null, hasMore: false } };

beforeEach(() => {
  vi.clearAllMocks();
  mockUseParams.mockReturnValue({ id: 'med-1' });
  mockUseApi.mockReturnValue({ householdId: 'hh1', isLoading: false });
  mockGetMedicine.mockResolvedValue(medicine);
  mockListMedicineProducts.mockResolvedValue(emptyProducts);
  mockListCabinetItems.mockResolvedValue(emptyItems);
});

describe('MedicineDetailPage', () => {
  it('shows loading skeleton when session is loading', () => {
    mockUseApi.mockReturnValue({ householdId: null, isLoading: true });

    render(<MedicineDetailPage />);

    expect(screen.queryByText('Metformin')).not.toBeInTheDocument();
  });

  it('renders medicine name and sections after load', async () => {
    render(<MedicineDetailPage />);

    await waitFor(() => expect(screen.getByText('Metformin')).toBeInTheDocument());
    expect(screen.getByText('Inventory')).toBeInTheDocument();
    expect(screen.getByText('Products (Brands/Packages)')).toBeInTheDocument();
  });

  it('shows error when medicine fails to load', async () => {
    mockGetMedicine.mockRejectedValue(new Error('Not found'));

    render(<MedicineDetailPage />);

    await waitFor(() => expect(screen.getByText('Not found')).toBeInTheDocument());
  });

  it('shows empty inventory state', async () => {
    render(<MedicineDetailPage />);

    await waitFor(() => expect(screen.getByText(/No inventory items/)).toBeInTheDocument());
  });

  it('shows empty products state', async () => {
    render(<MedicineDetailPage />);

    await waitFor(() => expect(screen.getByText(/No products yet/)).toBeInTheDocument());
  });

  it('toggles Add Product form', async () => {
    render(<MedicineDetailPage />);

    await waitFor(() => screen.getByText('Add Product'));
    await userEvent.click(screen.getByText('Add Product'));
    expect(screen.getByText('Add Product', { selector: 'h3' })).toBeInTheDocument();

    await userEvent.click(screen.getAllByText('Cancel')[0]);
    expect(screen.queryByText('Add Product', { selector: 'h3' })).not.toBeInTheDocument();
  });

  it('toggles edit medicine form', async () => {
    render(<MedicineDetailPage />);

    await waitFor(() => screen.getByTitle('Edit'));
    await userEvent.click(screen.getByTitle('Edit'));
    expect(screen.getByText('Edit Medicine')).toBeInTheDocument();

    await userEvent.click(screen.getByText('Cancel'));
    expect(screen.queryByText('Edit Medicine')).not.toBeInTheDocument();
  });

  it('saves medicine edit', async () => {
    mockUpdateMedicine.mockResolvedValue({ ...medicine, name: 'Metformin XR' });

    render(<MedicineDetailPage />);

    await waitFor(() => screen.getByTitle('Edit'));
    await userEvent.click(screen.getByTitle('Edit'));

    await userEvent.click(screen.getByRole('button', { name: 'Save' }));

    await waitFor(() =>
      expect(mockUpdateMedicine).toHaveBeenCalledWith('hh1', 'med-1', expect.any(Object)),
    );
  });

  it('deletes a product after confirmation', async () => {
    mockListMedicineProducts.mockResolvedValue({
      data: [
        {
          _id: 'prod-1',
          brand: 'Glucophage',
          packageSize: 60,
          packageUnit: 'tablet',
          source: 'manual',
        },
      ],
      pagination: { cursor: null, hasMore: false },
    });
    mockDeleteMedicineProduct.mockResolvedValue({});
    vi.spyOn(window, 'confirm').mockReturnValue(true);

    render(<MedicineDetailPage />);

    await waitFor(() => screen.getByText('Glucophage'));
    await userEvent.click(screen.getByTitle('Delete'));

    expect(mockDeleteMedicineProduct).toHaveBeenCalledWith('hh1', 'prod-1');
  });

  it('submits CreateProductForm', async () => {
    mockCreateMedicineProduct.mockResolvedValue({
      _id: 'prod-new',
      brand: 'NewBrand',
      packageSize: 30,
      packageUnit: 'tablet',
      source: 'manual',
    });

    render(<MedicineDetailPage />);

    await waitFor(() => screen.getByText('Add Product'));
    await userEvent.click(screen.getByText('Add Product'));

    await waitFor(() => screen.getByPlaceholderText('e.g. CVS Health'));
    fireEvent.change(screen.getByPlaceholderText('e.g. CVS Health'), {
      target: { value: 'NewBrand' },
    });
    fireEvent.change(screen.getByPlaceholderText('90'), {
      target: { value: '30' },
    });
    fireEvent.submit(screen.getByPlaceholderText('e.g. CVS Health').closest('form')!);

    await waitFor(() =>
      expect(mockCreateMedicineProduct).toHaveBeenCalledWith(
        'hh1',
        'med-1',
        expect.objectContaining({ brand: 'NewBrand' }),
      ),
    );
  });

  it('shows create product error on failure', async () => {
    mockCreateMedicineProduct.mockRejectedValue(new Error('Duplicate brand'));

    render(<MedicineDetailPage />);

    await waitFor(() => screen.getByText('Add Product'));
    await userEvent.click(screen.getByText('Add Product'));

    await waitFor(() => screen.getByPlaceholderText('e.g. CVS Health'));
    fireEvent.change(screen.getByPlaceholderText('e.g. CVS Health'), {
      target: { value: 'Brand' },
    });
    fireEvent.submit(screen.getByPlaceholderText('e.g. CVS Health').closest('form')!);

    await waitFor(() => expect(screen.getByText('Duplicate brand')).toBeInTheDocument());
  });

  it('opens and saves product edit form', async () => {
    mockListMedicineProducts.mockResolvedValue({
      data: [
        {
          _id: 'prod-1',
          brand: 'Glucophage',
          packageSize: 60,
          packageUnit: 'tablet',
          source: 'manual',
        },
      ],
      pagination: { cursor: null, hasMore: false },
    });
    mockUpdateMedicineProduct.mockResolvedValue({
      _id: 'prod-1',
      brand: 'Glucophage XR',
      packageSize: 60,
      packageUnit: 'tablet',
      source: 'manual',
    });

    render(<MedicineDetailPage />);

    await waitFor(() => screen.getByText('Glucophage'));
    // First Edit title is the medicine edit, second is the product edit
    await userEvent.click(screen.getAllByTitle('Edit')[1]!);

    await waitFor(() => screen.getByDisplayValue('Glucophage'));
    fireEvent.change(screen.getByDisplayValue('Glucophage'), {
      target: { value: 'Glucophage XR' },
    });
    fireEvent.submit(screen.getByDisplayValue('Glucophage XR').closest('form')!);

    await waitFor(() =>
      expect(mockUpdateMedicineProduct).toHaveBeenCalledWith(
        'hh1',
        'prod-1',
        expect.objectContaining({ brand: 'Glucophage XR' }),
      ),
    );
  });

  it('shows concentration fields when injection medicine with ml unit', async () => {
    mockGetMedicine.mockResolvedValue({
      ...medicine,
      form: 'injection',
    });

    render(<MedicineDetailPage />);

    await waitFor(() => screen.getByText('Add Product'));
    await userEvent.click(screen.getByText('Add Product'));

    await waitFor(() => screen.getByPlaceholderText('e.g. CVS Health'));
    // Change package unit to ml to show concentration fields
    const unitSelect = screen
      .getAllByRole('combobox')
      .find((s) => (s as HTMLSelectElement).value === 'vial') as HTMLSelectElement;
    fireEvent.change(unitSelect!, { target: { value: 'ml' } });

    await waitFor(() => expect(screen.getByPlaceholderText('e.g. 100')).toBeInTheDocument());
  });

  it('deletes a product after confirmation', async () => {
    mockListMedicineProducts.mockResolvedValue({
      data: [
        {
          _id: 'prod-1',
          brand: 'Glucophage',
          packageSize: 60,
          packageUnit: 'tablet',
          source: 'manual',
        },
      ],
      pagination: { cursor: null, hasMore: false },
    });
    mockDeleteMedicineProduct.mockResolvedValue({});
    vi.spyOn(window, 'confirm').mockReturnValue(true);

    render(<MedicineDetailPage />);

    await waitFor(() => screen.getByText('Glucophage'));
    await userEvent.click(screen.getByTitle('Delete'));

    expect(mockDeleteMedicineProduct).toHaveBeenCalledWith('hh1', 'prod-1');
  });

  it('edits injection product and changes concentration fields', async () => {
    mockGetMedicine.mockResolvedValue({
      ...medicine,
      form: 'injection',
    });
    mockListMedicineProducts.mockResolvedValue({
      data: [
        {
          _id: 'prod-1',
          brand: 'Insulin',
          packageSize: 10,
          packageUnit: 'ml',
          source: 'manual',
        },
      ],
      pagination: { cursor: null, hasMore: false },
    });

    render(<MedicineDetailPage />);

    await waitFor(() => screen.getByText('Insulin'));
    await userEvent.click(screen.getAllByTitle('Edit')[1]!);

    await waitFor(() => screen.getByDisplayValue('Insulin'));

    // concentration field should be visible since form=injection, unit=ml
    await waitFor(() => screen.getByPlaceholderText('e.g. 100'));
    fireEvent.change(screen.getByPlaceholderText('e.g. 100'), { target: { value: '100' } });

    // Change concentration unit
    const concUnitSelect = screen
      .getAllByRole('combobox')
      .find((s) => (s as HTMLSelectElement).options[0]?.text === '--') as HTMLSelectElement;
    if (concUnitSelect) {
      fireEvent.change(concUnitSelect, { target: { value: 'mg/ml' } });
    }

    expect(screen.getByDisplayValue('Insulin')).toBeInTheDocument();
  });

  it('changes fields in the product edit inline form', async () => {
    mockListMedicineProducts.mockResolvedValue({
      data: [
        {
          _id: 'prod-1',
          brand: 'Glucophage',
          packageSize: 60,
          packageUnit: 'tablet',
          source: 'manual',
        },
      ],
      pagination: { cursor: null, hasMore: false },
    });

    render(<MedicineDetailPage />);

    await waitFor(() => screen.getByText('Glucophage'));
    await userEvent.click(screen.getAllByTitle('Edit')[1]!);

    await waitFor(() => screen.getByDisplayValue('Glucophage'));

    // Change package size
    fireEvent.change(screen.getByDisplayValue('60'), { target: { value: '90' } });

    // Change package unit
    const unitSelect = screen
      .getAllByRole('combobox')
      .find((s) => (s as HTMLSelectElement).value === 'tablet') as HTMLSelectElement;
    fireEvent.change(unitSelect!, { target: { value: 'capsule' } });

    expect(screen.getByDisplayValue('Glucophage')).toBeInTheDocument();
  });

  it('changes manufacturer, concentration and notes fields in product form', async () => {
    mockGetMedicine.mockResolvedValue({
      ...medicine,
      form: 'injection',
    });

    render(<MedicineDetailPage />);

    await waitFor(() => screen.getByText('Add Product'));
    await userEvent.click(screen.getByText('Add Product'));

    await waitFor(() => screen.getByPlaceholderText('e.g. Pfizer'));

    // Change manufacturer (truthy) then clear (falsy → undefined)
    fireEvent.change(screen.getByPlaceholderText('e.g. Pfizer'), { target: { value: 'Pfizer' } });
    fireEvent.change(screen.getByPlaceholderText('e.g. Pfizer'), { target: { value: '' } });

    // Change notes (truthy) then clear (falsy → undefined)
    fireEvent.change(screen.getByPlaceholderText('Any additional notes'), {
      target: { value: 'Store in fridge' },
    });
    fireEvent.change(screen.getByPlaceholderText('Any additional notes'), {
      target: { value: '' },
    });

    // Change unit to ml to show concentration fields
    const unitSelect = screen
      .getAllByRole('combobox')
      .find((s) => (s as HTMLSelectElement).value === 'vial') as HTMLSelectElement;
    fireEvent.change(unitSelect!, { target: { value: 'ml' } });

    await waitFor(() => screen.getByPlaceholderText('e.g. 100'));
    // Set concentration (truthy) then clear (falsy → undefined)
    fireEvent.change(screen.getByPlaceholderText('e.g. 100'), { target: { value: '50' } });
    fireEvent.change(screen.getByPlaceholderText('e.g. 100'), { target: { value: '' } });

    // Change concentration unit
    const concUnitSelect = screen
      .getAllByRole('combobox')
      .find((s) => (s as HTMLSelectElement).value === '') as HTMLSelectElement;
    if (concUnitSelect) {
      fireEvent.change(concUnitSelect, { target: { value: 'mg/ml' } });
    }

    expect(screen.getByPlaceholderText('e.g. Pfizer')).toBeInTheDocument();
  });

  it('changes fields in the product edit inline form (manufacturer, notes)', async () => {
    mockListMedicineProducts.mockResolvedValue({
      data: [
        {
          _id: 'prod-1',
          brand: 'Glucophage',
          packageSize: 60,
          packageUnit: 'tablet',
          source: 'manual',
          manufacturer: '',
          notes: '',
        },
      ],
      pagination: { cursor: null, hasMore: false },
    });

    render(<MedicineDetailPage />);

    await waitFor(() => screen.getByText('Glucophage'));
    await userEvent.click(screen.getAllByTitle('Edit')[1]!);

    await waitFor(() => screen.getByDisplayValue('Glucophage'));

    // Find the manufacturer input (empty string value, maxLength 200)
    const allInputs = document.querySelectorAll('input[maxLength="200"]');
    // First is brand (Glucophage), second is manufacturer
    if (allInputs.length > 1) {
      fireEvent.change(allInputs[1]!, { target: { value: 'Pfizer' } });
      // Clear manufacturer to cover the || undefined false branch
      fireEvent.change(allInputs[1]!, { target: { value: '' } });
    }

    // Change notes (maxLength 1000 input)
    const notesInput = document.querySelector('input[maxLength="1000"]') as HTMLElement;
    if (notesInput) {
      fireEvent.change(notesInput, { target: { value: 'Keep refrigerated' } });
    }

    expect(screen.getByDisplayValue('Glucophage')).toBeInTheDocument();
  });

  it('adjusts cabinet item quantity', async () => {
    mockListCabinetItems.mockResolvedValue({
      data: [
        {
          _id: 'ci-1',
          quantity: 10,
          unit: 'tablet',
          status: 'active',
        },
      ],
      pagination: { cursor: null, hasMore: false },
    });
    mockAdjustCabinetItemQuantity.mockResolvedValue({});

    render(<MedicineDetailPage />);

    await waitFor(() => screen.getByTitle('Add 1'));
    await userEvent.click(screen.getByTitle('Add 1'));

    expect(mockAdjustCabinetItemQuantity).toHaveBeenCalledWith('hh1', 'ci-1', { delta: 1 });
  });

  it('takes 1 from cabinet item', async () => {
    mockListCabinetItems.mockResolvedValue({
      data: [{ _id: 'ci-1', quantity: 10, unit: 'tablet', status: 'active' }],
      pagination: { cursor: null, hasMore: false },
    });
    mockAdjustCabinetItemQuantity.mockResolvedValue({});

    render(<MedicineDetailPage />);

    await waitFor(() => screen.getByTitle('Take 1'));
    await userEvent.click(screen.getByTitle('Take 1'));

    expect(mockAdjustCabinetItemQuantity).toHaveBeenCalledWith('hh1', 'ci-1', { delta: -1 });
  });

  it('deletes cabinet item after confirmation', async () => {
    mockListCabinetItems.mockResolvedValue({
      data: [{ _id: 'ci-1', quantity: 10, unit: 'tablet', status: 'active' }],
      pagination: { cursor: null, hasMore: false },
    });
    mockDeleteCabinetItem.mockResolvedValue({});
    vi.spyOn(window, 'confirm').mockReturnValue(true);

    render(<MedicineDetailPage />);

    await waitFor(() => screen.getByTitle('Delete'));
    await userEvent.click(screen.getByTitle('Delete'));

    expect(mockDeleteCabinetItem).toHaveBeenCalledWith('hh1', 'ci-1');
  });

  it('cancels CreateProductForm with internal Cancel button', async () => {
    render(<MedicineDetailPage />);

    await waitFor(() => screen.getByText('Add Product'));
    await userEvent.click(screen.getByText('Add Product'));

    await waitFor(() => screen.getByText('Add Product', { selector: 'h3' }));
    // Click the Cancel button inside the form (last Cancel button in DOM)
    const cancelButtons = screen.getAllByText('Cancel');
    await userEvent.click(cancelButtons[cancelButtons.length - 1]!);

    expect(screen.queryByText('Add Product', { selector: 'h3' })).not.toBeInTheDocument();
  });

  it('changes all fields in edit medicine form', async () => {
    render(<MedicineDetailPage />);

    await waitFor(() => screen.getByTitle('Edit'));
    await userEvent.click(screen.getByTitle('Edit'));

    await waitFor(() => screen.getByPlaceholderText('e.g. daily, morning'));

    // Change name
    const nameInput = document.querySelector('input[maxLength="200"]') as HTMLElement;
    if (nameInput) fireEvent.change(nameInput, { target: { value: 'Metformin XR' } });

    // Change form select
    const formSelect = screen
      .getAllByRole('combobox')
      .find((s) => (s as HTMLSelectElement).options[0]?.value === 'tablet') as HTMLSelectElement;
    if (formSelect) fireEvent.change(formSelect, { target: { value: 'capsule' } });

    // Change strength
    const strengthInput = document.querySelector('input[min="0.01"]') as HTMLElement;
    if (strengthInput) fireEvent.change(strengthInput, { target: { value: '250' } });

    // Change category select
    const catSelect = screen
      .getAllByRole('combobox')
      .find(
        (s) => (s as HTMLSelectElement).options[0]?.value === 'prescription',
      ) as HTMLSelectElement;
    if (catSelect) fireEvent.change(catSelect, { target: { value: 'otc' } });

    // Change notes (truthy value)
    const notesInputs = document.querySelectorAll('input[maxLength="1000"]');
    if (notesInputs[0]) fireEvent.change(notesInputs[0]!, { target: { value: 'Take with food' } });
    // Also clear notes (covers the || undefined false branch)
    if (notesInputs[0]) fireEvent.change(notesInputs[0]!, { target: { value: '' } });

    // Change tags
    fireEvent.change(screen.getByPlaceholderText('e.g. daily, morning'), {
      target: { value: 'morning, daily' },
    });

    expect(screen.getByPlaceholderText('e.g. daily, morning')).toBeInTheDocument();
  });

  it('shows error when update medicine fails', async () => {
    mockUpdateMedicine.mockRejectedValue(new Error('Update failed'));

    render(<MedicineDetailPage />);

    await waitFor(() => screen.getByTitle('Edit'));
    await userEvent.click(screen.getByTitle('Edit'));
    await userEvent.click(screen.getByRole('button', { name: 'Save' }));

    await waitFor(() => expect(screen.getByText('Update failed')).toBeInTheDocument());
  });

  it('dismisses error in detail page', async () => {
    mockUpdateMedicine.mockRejectedValue(new Error('Update failed'));

    render(<MedicineDetailPage />);

    await waitFor(() => screen.getByTitle('Edit'));
    await userEvent.click(screen.getByTitle('Edit'));
    await userEvent.click(screen.getByRole('button', { name: 'Save' }));

    await waitFor(() => screen.getByText('Update failed'));
    await userEvent.click(screen.getByText('Dismiss'));
    expect(screen.queryByText('Update failed')).not.toBeInTheDocument();
  });

  it('changes strength unit in edit medicine form', async () => {
    render(<MedicineDetailPage />);

    await waitFor(() => screen.getByTitle('Edit'));
    await userEvent.click(screen.getByTitle('Edit'));

    await waitFor(() => screen.getByText('Edit Medicine'));
    // Change strength unit select (the one with 'mg' options)
    const unitSelect = screen
      .getAllByRole('combobox')
      .find((s) => (s as HTMLSelectElement).value === 'mg') as HTMLSelectElement;
    if (unitSelect) fireEvent.change(unitSelect, { target: { value: 'mcg' } });

    expect(screen.getByText('Edit Medicine')).toBeInTheDocument();
  });

  it('cancels product edit form', async () => {
    mockListMedicineProducts.mockResolvedValue({
      data: [{ _id: 'mp-1', brand: 'Bayer', packageSize: 100, unit: 'tablet', form: 'tablet' }],
      pagination: { cursor: null, hasMore: false },
    });

    render(<MedicineDetailPage />);

    await waitFor(() => screen.getByText('Bayer'));
    const editButtons = screen.getAllByTitle('Edit');
    await userEvent.click(editButtons[editButtons.length - 1]!);
    await waitFor(() => screen.getByDisplayValue('Bayer'));

    // Click Cancel to close product edit form
    await userEvent.click(screen.getByRole('button', { name: 'Cancel' }));

    expect(screen.queryByDisplayValue('Bayer')).not.toBeInTheDocument();
  });

  it('shows fallback error when non-Error thrown on create product', async () => {
    mockCreateMedicineProduct.mockRejectedValue('create failed');

    render(<MedicineDetailPage />);

    await waitFor(() => screen.getByText('Add Product'));
    await userEvent.click(screen.getByText('Add Product'));

    await waitFor(() => screen.getByPlaceholderText('e.g. CVS Health'));
    fireEvent.change(screen.getByPlaceholderText('e.g. CVS Health'), {
      target: { value: 'Brand X' },
    });
    fireEvent.submit(screen.getByPlaceholderText('e.g. CVS Health').closest('form')!);

    await waitFor(() => expect(screen.getByText('Failed to create product')).toBeInTheDocument());
  });

  it('shows fallback error when non-Error thrown on update product', async () => {
    mockListMedicineProducts.mockResolvedValue({
      data: [{ _id: 'mp-1', brand: 'Bayer', packageSize: 100, unit: 'tablet', form: 'tablet' }],
      pagination: { cursor: null, hasMore: false },
    });
    mockUpdateMedicineProduct.mockRejectedValue('update failed');

    render(<MedicineDetailPage />);

    await waitFor(() => screen.getByText('Bayer'));
    // Click the product Edit button (last Edit button, not the medicine one)
    const editButtons = screen.getAllByTitle('Edit');
    await userEvent.click(editButtons[editButtons.length - 1]!);
    await waitFor(() => screen.getByDisplayValue('Bayer'));
    fireEvent.submit(screen.getByDisplayValue('Bayer').closest('form')!);

    await waitFor(() => expect(screen.getByText('Failed to update product')).toBeInTheDocument());
  });

  it('shows fallback error when non-Error thrown on delete product', async () => {
    mockListMedicineProducts.mockResolvedValue({
      data: [{ _id: 'mp-1', brand: 'Bayer', packageSize: 100, unit: 'tablet', form: 'tablet' }],
      pagination: { cursor: null, hasMore: false },
    });
    mockDeleteMedicineProduct.mockRejectedValue('delete failed');
    vi.spyOn(window, 'confirm').mockReturnValue(true);

    render(<MedicineDetailPage />);

    await waitFor(() => screen.getByText('Bayer'));
    await userEvent.click(screen.getAllByTitle('Delete')[0]!);

    await waitFor(() => expect(screen.getByText('Failed to delete product')).toBeInTheDocument());
  });

  it('shows fallback error when non-Error thrown on adjust cabinet', async () => {
    mockListCabinetItems.mockResolvedValue({
      data: [{ _id: 'ci-1', quantity: 10, unit: 'tablet', status: 'active' }],
      pagination: { cursor: null, hasMore: false },
    });
    mockAdjustCabinetItemQuantity.mockRejectedValue('adjust failed');

    render(<MedicineDetailPage />);

    await waitFor(() => screen.getByTitle('Take 1'));
    await userEvent.click(screen.getByTitle('Take 1'));

    await waitFor(() => expect(screen.getByText('Failed to adjust quantity')).toBeInTheDocument());
  });

  it('shows product concentration and manufacturer in display', async () => {
    mockListMedicineProducts.mockResolvedValue({
      data: [
        {
          _id: 'mp-1',
          brand: 'Lantus',
          packageSize: 10,
          packageUnit: 'ml',
          concentration: 100,
          concentrationUnit: 'IU/ml',
          manufacturer: 'Sanofi',
          notes: 'Refrigerate after opening',
        },
      ],
      pagination: { cursor: null, hasMore: false },
    });

    render(<MedicineDetailPage />);

    await waitFor(() => screen.getByText('Lantus'));
    expect(screen.getByText(/100 IU\/ml/)).toBeInTheDocument();
    expect(screen.getByText(/Sanofi/)).toBeInTheDocument();
    expect(screen.getByText('Refrigerate after opening')).toBeInTheDocument();
  });

  it('clears concentration and notes in edit inline form for injection', async () => {
    mockGetMedicine.mockResolvedValue({ ...medicine, form: 'injection' });
    mockListMedicineProducts.mockResolvedValue({
      data: [
        {
          _id: 'prod-1',
          brand: 'Lantus',
          packageSize: 10,
          packageUnit: 'ml',
          source: 'manual',
        },
      ],
      pagination: { cursor: null, hasMore: false },
    });

    render(<MedicineDetailPage />);

    await waitFor(() => screen.getByText('Lantus'));
    await userEvent.click(screen.getAllByTitle('Edit')[1]!);

    await waitFor(() => screen.getByDisplayValue('Lantus'));
    await waitFor(() => screen.getByPlaceholderText('e.g. 100'));

    // Set concentration then clear (covers undefined branch at line 675)
    fireEvent.change(screen.getByPlaceholderText('e.g. 100'), { target: { value: '100' } });
    fireEvent.change(screen.getByPlaceholderText('e.g. 100'), { target: { value: '' } });

    // Set notes then clear (covers undefined branch at line 720)
    const notesInput = document.querySelector('input[maxLength="1000"]') as HTMLElement;
    if (notesInput) fireEvent.change(notesInput, { target: { value: 'Refrigerate' } });
    if (notesInput) fireEvent.change(notesInput, { target: { value: '' } });

    expect(screen.getByDisplayValue('Lantus')).toBeInTheDocument();
  });

  it('shows fallback error when non-Error thrown on delete cabinet', async () => {
    mockListCabinetItems.mockResolvedValue({
      data: [{ _id: 'ci-1', quantity: 10, unit: 'tablet', status: 'active' }],
      pagination: { cursor: null, hasMore: false },
    });
    mockDeleteCabinetItem.mockRejectedValue('delete failed');
    vi.spyOn(window, 'confirm').mockReturnValue(true);

    render(<MedicineDetailPage />);

    await waitFor(() => screen.getAllByTitle('Delete'));
    await userEvent.click(screen.getAllByTitle('Delete')[0]!);

    await waitFor(() =>
      expect(screen.getByText('Failed to delete cabinet item')).toBeInTheDocument(),
    );
  });
});