'use client';

import { useState, useEffect, useMemo, useRef, type ReactNode } from 'react';
import {
  Smartphone,
  Tag,
  Plus,
  Search,
  RefreshCw,
  ChevronDown,
  ChevronRight,
  Trash2,
  Filter,
  X,
  Box,
  FileSpreadsheet,
  FileText,
  Columns3,
  GripVertical,
  ArrowUpDown,
  AlertTriangle,
} from 'lucide-react';
import { toast } from 'sonner';
import { format } from 'date-fns';
import { AnimatePresence, motion } from '@/lib/motion';
import {
  catalogService,
  BrandResponse,
  DeviceSeriesResponse,
  DeviceModelResponse,
} from '@/services/api/catalogService';
import { SlideOver } from '@/components/ui/SlideOver';
import { RowActionsMenu } from '@/components/ui/RowActionsMenu';
import { ViewModeToggle } from '@/components/ui/ViewModeToggle';
import { TablePagination, useClientPagination } from '@/components/ui/TablePagination';
import ImageUpload from '@/components/ui/ImageUpload';
import { CustomSelect } from '@/components/ui/CustomSelect';
import { getMediaUrl } from '@/services/api/config';


const DEVICE_TYPES = ['laptop', 'tablet', 'mobile'] as const;
type DeviceType = (typeof DEVICE_TYPES)[number];
type StatusFilter = 'active' | 'inactive';
type SortField = 'name' | 'slug' | 'brand' | 'series' | 'releaseYear' | 'status';
type SortDir = 'asc' | 'desc';
type SortConfig = { field: SortField; dir: SortDir };
type FilterSection = 'name' | 'brand' | 'series' | 'deviceTypes' | 'status';

type ModelFilters = {
  modelIds: string[];
  brandIds: string[];
  seriesIds: string[];
  deviceTypes: DeviceType[];
  statuses: StatusFilter[];
};

const EMPTY_FILTERS: ModelFilters = {
  modelIds: [],
  brandIds: [],
  seriesIds: [],
  deviceTypes: [],
  statuses: [],
};

const FILTER_PAGE_SIZE = 5;

const EMPTY_COLUMNS = {
  modelName: true,
  slug: true,
  brand: true,
  series: true,
  deviceType: true,
  releaseYear: true,
  fullPath: true,
  status: true,
  actions: true,
};

const COLUMN_OPTIONS = [
  { key: 'modelName' as const, label: 'Model Name', locked: true },
  { key: 'slug' as const, label: 'Slug / Path', locked: false },
  { key: 'brand' as const, label: 'Brand', locked: false },
  { key: 'series' as const, label: 'Series', locked: false },
  { key: 'deviceType' as const, label: 'Device Type', locked: false },
  { key: 'releaseYear' as const, label: 'Release Year', locked: false },
  { key: 'fullPath' as const, label: 'Full Path', locked: false },
  { key: 'status' as const, label: 'Status', locked: false },
  { key: 'actions' as const, label: 'Actions', locked: false },
];

const SORT_OPTIONS: { field: SortField; dir: SortDir; label: string }[] = [
  { field: 'name', dir: 'asc', label: 'Name A-Z' },
  { field: 'name', dir: 'desc', label: 'Name Z-A' },
  { field: 'slug', dir: 'asc', label: 'Slug A-Z' },
  { field: 'slug', dir: 'desc', label: 'Slug Z-A' },
  { field: 'brand', dir: 'asc', label: 'Brand A-Z' },
  { field: 'brand', dir: 'desc', label: 'Brand Z-A' },
  { field: 'series', dir: 'asc', label: 'Series A-Z' },
  { field: 'series', dir: 'desc', label: 'Series Z-A' },
  { field: 'releaseYear', dir: 'asc', label: 'Release Year Ascending' },
  { field: 'releaseYear', dir: 'desc', label: 'Release Year Descending' },
  { field: 'status', dir: 'asc', label: 'Status Active first' },
  { field: 'status', dir: 'desc', label: 'Status Inactive first' },
];

const DEFAULT_SORT: SortConfig = { field: 'name', dir: 'asc' };

function normalizeId(value: unknown): string {
  if (value == null) return '';
  return String(value).trim();
}

function idsEqual(a: unknown, b: unknown): boolean {
  const left = normalizeId(a);
  const right = normalizeId(b);
  return left !== '' && right !== '' && left === right;
}

function coerceFlag(value: unknown): boolean {
  if (typeof value === 'boolean') return value;
  if (typeof value === 'number') return value !== 0;
  if (value == null) return false;
  const normalized = String(value).trim().toLowerCase();
  if (['true', '1', 'yes', 'enabled', 'active'].includes(normalized)) return true;
  if (['false', '0', 'no', 'disabled', 'inactive', '', 'null', 'undefined'].includes(normalized)) return false;
  return false;
}

function formatDeviceTypeLabel(value?: string | null): string {
  if (!value) return '—';
  return value.charAt(0).toUpperCase() + value.slice(1);
}

export default function DeviceModelsPage() {
  const [brands, setBrands] = useState<BrandResponse[]>([]);
  const [seriesList, setSeriesList] = useState<DeviceSeriesResponse[]>([]);
  const [models, setModels] = useState<DeviceModelResponse[]>([]);
  const [loading, setLoading] = useState(true);
  const [searchQuery, setSearchQuery] = useState('');
  const [viewMode, setViewMode] = useState<'table' | 'grid'>('table');
  const [openActionId, setOpenActionId] = useState<string | null>(null);
  const [showFilterPanel, setShowFilterPanel] = useState(false);
  const [showExportMenu, setShowExportMenu] = useState(false);
  const [showColumnsPanel, setShowColumnsPanel] = useState(false);
  const [showSortPanel, setShowSortPanel] = useState(false);
  const [draftFilters, setDraftFilters] = useState<ModelFilters>(EMPTY_FILTERS);
  const [activeFilters, setActiveFilters] = useState<ModelFilters>(EMPTY_FILTERS);
  const [expandedFilterSections, setExpandedFilterSections] = useState<Record<FilterSection, boolean>>({
    name: false,
    brand: false,
    series: false,
    deviceTypes: true,
    status: false,
  });
  const [filterSectionSearch, setFilterSectionSearch] = useState({ name: '', brand: '', series: '' });
  const [filterVisibleCounts, setFilterVisibleCounts] = useState({
    name: FILTER_PAGE_SIZE,
    brand: FILTER_PAGE_SIZE,
    series: FILTER_PAGE_SIZE,
  });
  const [visibleColumns, setVisibleColumns] = useState(EMPTY_COLUMNS);
  const [sortConfig, setSortConfig] = useState<SortConfig>(DEFAULT_SORT);
  const filterRef = useRef<HTMLDivElement>(null);
  const exportRef = useRef<HTMLDivElement>(null);
  const columnsRef = useRef<HTMLDivElement>(null);
  const sortRef = useRef<HTMLDivElement>(null);

  const [showModelDrawer, setShowModelDrawer] = useState(false);
  const [editingModel, setEditingModel] = useState<DeviceModelResponse | null>(null);
  const [modelName, setModelName] = useState('');
  const [modelSeriesId, setModelSeriesId] = useState('');
  const [modelBrandId, setModelBrandId] = useState('');
  const [modelReleaseYear, setModelReleaseYear] = useState('');
  const [modelImg, setModelImg] = useState('');
  const [modelDeviceType, setModelDeviceType] = useState('');
  const [isSubmitting, setIsSubmitting] = useState(false);
  const [deleteTarget, setDeleteTarget] = useState<{ id: string; name: string } | null>(null);
  const [isDeleting, setIsDeleting] = useState(false);

  const brandMap = useMemo(() => {
    const map = new Map<string, BrandResponse>();
    brands.forEach((brand) => map.set(normalizeId(brand.brand_id), brand));
    return map;
  }, [brands]);

  const seriesMap = useMemo(() => {
    const map = new Map<string, DeviceSeriesResponse>();
    seriesList.forEach((s) => map.set(normalizeId(s.series_id), s));
    return map;
  }, [seriesList]);

  const getBrandName = (brandId: string) => brandMap.get(normalizeId(brandId))?.name || '—';
  const getSeriesName = (seriesId: string) => seriesMap.get(normalizeId(seriesId))?.name || '—';

  const fetchData = async () => {
    setLoading(true);
    try {
      const [fetchedBrands, fetchedSeries, fetchedModels] = await Promise.all([
        catalogService.getBrands(),
        catalogService.getDeviceSeries(),
        catalogService.getDeviceModels(),
      ]);
      setBrands(fetchedBrands);
      setSeriesList(fetchedSeries);
      setModels(fetchedModels);
    } catch (err: any) {
      toast.error(err?.message || 'Failed to load device models data');
    } finally {
      setLoading(false);
    }
  };

  useEffect(() => {
    fetchData();
  }, []);

  // Auto-inherit device_type from selected series
  useEffect(() => {
    if (modelSeriesId) {
      const selectedSeries = seriesList.find((s) => idsEqual(s.series_id, modelSeriesId));
      if (selectedSeries?.device_type) {
        setModelDeviceType(selectedSeries.device_type);
      }
    }
  }, [modelSeriesId, seriesList]);

  useEffect(() => {
    if (!showFilterPanel) return;
    const onPointerDown = (event: MouseEvent) => {
      if (!filterRef.current?.contains(event.target as Node)) setShowFilterPanel(false);
    };
    const onKeyDown = (event: KeyboardEvent) => {
      if (event.key === 'Escape') setShowFilterPanel(false);
    };
    document.addEventListener('mousedown', onPointerDown);
    document.addEventListener('keydown', onKeyDown);
    return () => {
      document.removeEventListener('mousedown', onPointerDown);
      document.removeEventListener('keydown', onKeyDown);
    };
  }, [showFilterPanel]);

  useEffect(() => {
    if (!showExportMenu) return;
    const onPointerDown = (event: MouseEvent) => {
      if (!exportRef.current?.contains(event.target as Node)) setShowExportMenu(false);
    };
    const onKeyDown = (event: KeyboardEvent) => {
      if (event.key === 'Escape') setShowExportMenu(false);
    };
    document.addEventListener('mousedown', onPointerDown);
    document.addEventListener('keydown', onKeyDown);
    return () => {
      document.removeEventListener('mousedown', onPointerDown);
      document.removeEventListener('keydown', onKeyDown);
    };
  }, [showExportMenu]);

  useEffect(() => {
    if (!showColumnsPanel) return;
    const onPointerDown = (event: MouseEvent) => {
      if (!columnsRef.current?.contains(event.target as Node)) setShowColumnsPanel(false);
    };
    const onKeyDown = (event: KeyboardEvent) => {
      if (event.key === 'Escape') setShowColumnsPanel(false);
    };
    document.addEventListener('mousedown', onPointerDown);
    document.addEventListener('keydown', onKeyDown);
    return () => {
      document.removeEventListener('mousedown', onPointerDown);
      document.removeEventListener('keydown', onKeyDown);
    };
  }, [showColumnsPanel]);

  useEffect(() => {
    if (!showSortPanel) return;
    const onPointerDown = (event: MouseEvent) => {
      if (!sortRef.current?.contains(event.target as Node)) setShowSortPanel(false);
    };
    const onKeyDown = (event: KeyboardEvent) => {
      if (event.key === 'Escape') setShowSortPanel(false);
    };
    document.addEventListener('mousedown', onPointerDown);
    document.addEventListener('keydown', onKeyDown);
    return () => {
      document.removeEventListener('mousedown', onPointerDown);
      document.removeEventListener('keydown', onKeyDown);
    };
  }, [showSortPanel]);

  const closeOverlays = () => {
    setShowFilterPanel(false);
    setShowColumnsPanel(false);
    setShowSortPanel(false);
  };

  const handleViewModeChange = (mode: 'table' | 'grid') => {
    setViewMode(mode);
    setOpenActionId(null);
    closeOverlays();
  };

  const selectedBrand = brands.find((b) => idsEqual(b.brand_id, modelBrandId));
  const brandDeviceTypes = selectedBrand?.device_types || [];
  const selectedSeries = seriesList.find((s) => idsEqual(s.series_id, modelSeriesId));

  const handleOpenCreate = () => {
    setEditingModel(null);
    setModelName('');
    setModelSeriesId('');
    setModelBrandId('');
    setModelReleaseYear('');
    setModelImg('');
    setModelDeviceType('');
    setShowModelDrawer(true);
  };

  const handleOpenEdit = (model: DeviceModelResponse) => {
    setEditingModel(model);
    setModelName(model.name);
    setModelBrandId(model.brand_id);
    setModelSeriesId(model.series_id || '');
    setModelReleaseYear(model.release_year ? model.release_year.toString() : '');
    setModelImg(model.image_url || '');
    setModelDeviceType(model.device_type || '');
    setShowModelDrawer(true);
  };

  const closeModelDrawer = () => {
    if (isSubmitting) return;
    setShowModelDrawer(false);
  };

  const handleBrandChange = (brandId: string) => {
    setModelBrandId(brandId);
    setModelSeriesId('');
    setModelDeviceType('');
  };

  const handleDeviceTypeChange = (deviceType: string) => {
    setModelDeviceType(deviceType);
    setModelSeriesId('');
  };

  const handleSubmitModel = async (e: React.FormEvent) => {
    e.preventDefault();
    if (!modelName.trim() || !modelBrandId) {
      toast.error('Name and Brand are required');
      return;
    }

    const finalDeviceType =
      brandDeviceTypes.length > 1
        ? modelDeviceType || null
        : selectedSeries?.device_type || brandDeviceTypes[0] || null;

    setIsSubmitting(true);
    try {
      if (editingModel) {
        const updated = await catalogService.updateDeviceModel(editingModel.model_id, {
          series_id: modelSeriesId || undefined,
          brand_id: modelBrandId,
          name: modelName.trim(),
          device_type: finalDeviceType,
          release_year: modelReleaseYear ? parseInt(modelReleaseYear, 10) : undefined,
          image_url: modelImg.trim() || undefined,
        });
        setModels(models.map((m) => (m.model_id === updated.model_id ? updated : m)));
        toast.success(`Model "${updated.name}" updated successfully`);
      } else {
        const created = await catalogService.createDeviceModel({
          series_id: modelSeriesId || undefined,
          brand_id: modelBrandId,
          name: modelName.trim(),
          device_type: finalDeviceType,
          release_year: modelReleaseYear ? parseInt(modelReleaseYear, 10) : undefined,
          image_url: modelImg.trim() || undefined,
        });
        setModels([...models, created]);
        toast.success(`Model "${created.name}" created successfully`);
      }
      setModelName('');
      setModelSeriesId('');
      setModelBrandId('');
      setModelReleaseYear('');
      setModelImg('');
      setModelDeviceType('');
      setEditingModel(null);
      setShowModelDrawer(false);
    } catch (err: any) {
      toast.error(err?.message || `Failed to ${editingModel ? 'update' : 'create'} model`);
    } finally {
      setIsSubmitting(false);
    }
  };

  const openDeleteModal = (id: string, name: string) => {
    setOpenActionId(null);
    setDeleteTarget({ id, name });
  };

  const closeDeleteModal = () => {
    if (isDeleting) return;
    setDeleteTarget(null);
  };

  const handleConfirmDelete = async () => {
    if (!deleteTarget) return;
    const { id, name } = deleteTarget;
    setIsDeleting(true);
    try {
      setModels((prev) => prev.filter((m) => m.model_id !== id));
      await catalogService.deleteDeviceModel(id);
      toast.success(`Device model "${name}" deleted successfully`);
      setDeleteTarget(null);
      fetchData();
    } catch (err: any) {
      toast.error(err?.message || 'Failed to delete device model');
      fetchData();
    } finally {
      setIsDeleting(false);
    }
  };

  const filteredModels = useMemo(() => {
    const q = searchQuery.trim().toLowerCase();

    const result = models.filter((m) => {
      const brandName = getBrandName(m.brand_id);
      const seriesName = getSeriesName(m.series_id);
      const searchMatch =
        !q ||
        (m.name || '').toLowerCase().includes(q) ||
        (m.slug || '').toLowerCase().includes(q) ||
        brandName.toLowerCase().includes(q) ||
        seriesName.toLowerCase().includes(q) ||
        (m.device_type || '').toLowerCase().includes(q) ||
        (m.full_path || '').toLowerCase().includes(q) ||
        (m.release_year != null && String(m.release_year).includes(q));

      const isActive = coerceFlag(m.is_active);
      const statusMatch =
        activeFilters.statuses.length === 0 ||
        (activeFilters.statuses.includes('active') && isActive) ||
        (activeFilters.statuses.includes('inactive') && !isActive);

      const modelMatch =
        activeFilters.modelIds.length === 0 ||
        activeFilters.modelIds.includes(normalizeId(m.model_id));

      const brandMatch =
        activeFilters.brandIds.length === 0 ||
        activeFilters.brandIds.includes(normalizeId(m.brand_id));

      const seriesMatch =
        activeFilters.seriesIds.length === 0 ||
        activeFilters.seriesIds.includes(normalizeId(m.series_id));

      const deviceMatch =
        activeFilters.deviceTypes.length === 0 ||
        (m.device_type != null && activeFilters.deviceTypes.includes(m.device_type as DeviceType));

      return searchMatch && modelMatch && brandMatch && seriesMatch && statusMatch && deviceMatch;
    });

    const dir = sortConfig.dir === 'asc' ? 1 : -1;
    return [...result].sort((a, b) => {
      if (sortConfig.field === 'releaseYear') {
        const left = a.release_year ?? -Infinity;
        const right = b.release_year ?? -Infinity;
        return (left - right) * dir;
      }
      if (sortConfig.field === 'status') {
        return (Number(coerceFlag(a.is_active)) - Number(coerceFlag(b.is_active))) * dir;
      }
      if (sortConfig.field === 'brand') {
        return getBrandName(a.brand_id).localeCompare(getBrandName(b.brand_id), undefined, {
          sensitivity: 'base',
        }) * dir;
      }
      if (sortConfig.field === 'series') {
        return getSeriesName(a.series_id).localeCompare(getSeriesName(b.series_id), undefined, {
          sensitivity: 'base',
        }) * dir;
      }
      const left = sortConfig.field === 'name' ? a.name || '' : a.slug || '';
      const right = sortConfig.field === 'name' ? b.name || '' : b.slug || '';
      return left.localeCompare(right, undefined, { sensitivity: 'base' }) * dir;
    });
  }, [models, searchQuery, activeFilters, sortConfig, brandMap, seriesMap]);

  const pager = useClientPagination(filteredModels);

  const filtersActive =
    activeFilters.modelIds.length > 0 ||
    activeFilters.brandIds.length > 0 ||
    activeFilters.seriesIds.length > 0 ||
    activeFilters.deviceTypes.length > 0 ||
    activeFilters.statuses.length > 0;

  const sortedModelFilterOptions = useMemo(
    () => [...models].sort((a, b) => a.name.localeCompare(b.name)),
    [models]
  );

  const sortedBrandFilterOptions = useMemo(
    () => [...brands].sort((a, b) => a.name.localeCompare(b.name)),
    [brands]
  );

  const sortedSeriesFilterOptions = useMemo(
    () => [...seriesList].sort((a, b) => a.name.localeCompare(b.name)),
    [seriesList]
  );

  const toggleFilterSection = (section: FilterSection) => {
    setExpandedFilterSections((prev) => ({ ...prev, [section]: !prev[section] }));
  };

  const toggleDraftListValue = <T extends string>(
    key: keyof Pick<ModelFilters, 'modelIds' | 'brandIds' | 'seriesIds' | 'deviceTypes' | 'statuses'>,
    value: T
  ) => {
    setDraftFilters((prev) => {
      const current = prev[key] as T[];
      return {
        ...prev,
        [key]: current.includes(value) ? current.filter((item) => item !== value) : [...current, value],
      };
    });
  };

  const openFilterPanel = () => {
    setDraftFilters(activeFilters);
    setFilterSectionSearch({ name: '', brand: '', series: '' });
    setFilterVisibleCounts({ name: FILTER_PAGE_SIZE, brand: FILTER_PAGE_SIZE, series: FILTER_PAGE_SIZE });
    setShowColumnsPanel(false);
    setShowSortPanel(false);
    setShowFilterPanel(true);
  };

  const visibleColumnCount = Object.values(visibleColumns).filter(Boolean).length;

  const toggleColumn = (key: keyof typeof EMPTY_COLUMNS) => {
    if (key === 'modelName') return;
    setVisibleColumns((prev) => ({ ...prev, [key]: !prev[key] }));
  };

  const handleExportExcel = () => {
    if (filteredModels.length === 0) {
      toast.warning('No device models to export');
      return;
    }
    const headers = [
      'S.No',
      'Model Name',
      'Slug / Path',
      'Brand',
      'Series',
      'Device Type',
      'Release Year',
      'Full Path',
      'Status',
    ];
    const rows = filteredModels.map((m, i) => [
      i + 1,
      m.name,
      m.slug || '',
      getBrandName(m.brand_id),
      getSeriesName(m.series_id),
      formatDeviceTypeLabel(m.device_type),
      m.release_year ?? '',
      m.full_path || '',
      coerceFlag(m.is_active) ? 'Active' : 'Inactive',
    ]);
    const csvContent = [
      headers.join(','),
      ...rows.map((row) => row.map((val) => `"${String(val).replace(/"/g, '""')}"`).join(',')),
    ].join('\n');
    const blob = new Blob([csvContent], { type: 'text/csv;charset=utf-8;' });
    const url = URL.createObjectURL(blob);
    const link = document.createElement('a');
    link.href = url;
    link.download = `ifixkart_device_models_${format(new Date(), 'yyyyMMdd')}.csv`;
    document.body.appendChild(link);
    link.click();
    document.body.removeChild(link);
    URL.revokeObjectURL(url);
    setShowExportMenu(false);
    toast.success(`Downloaded ${filteredModels.length} ${filteredModels.length === 1 ? 'device model' : 'device models'} as CSV`);
  };

  const handleExportPDF = () => {
    if (filteredModels.length === 0) {
      toast.warning('No device models to export');
      return;
    }
    const printWindow = window.open('', '_blank');
    if (!printWindow) {
      toast.error('Allow pop-ups to open the device models print preview');
      return;
    }
    const html = `
      <html>
        <head>
          <title>iFixKart Device Models PDF Export</title>
          <style>
            body { font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif; padding: 20px; color: #1e293b; }
            h2 { color: #0f172a; border-bottom: 2px solid #e2e8f0; padding-bottom: 10px; }
            table { width: 100%; border-collapse: collapse; margin-top: 20px; font-size: 11px; }
            th { background-color: #0f172a; color: white; padding: 10px; text-align: left; }
            td { padding: 10px; border-bottom: 1px solid #e2e8f0; }
            tr:nth-child(even) { background-color: #f8fafc; }
          </style>
        </head>
        <body>
          <h2>iFixKart Device Models (${filteredModels.length} Records)</h2>
          <p>Exported on: ${format(new Date(), 'yyyy-MM-dd HH:mm:ss')}</p>
          <table>
            <thead>
              <tr>
                <th>S.No</th>
                <th>Model Name</th>
                <th>Slug / Path</th>
                <th>Brand</th>
                <th>Series</th>
                <th>Device Type</th>
                <th>Release Year</th>
                <th>Full Path</th>
                <th>Status</th>
              </tr>
            </thead>
            <tbody>
              ${filteredModels
                .map(
                  (m, i) => `
                <tr>
                  <td>${i + 1}</td>
                  <td>${m.name}</td>
                  <td>${m.slug || ''}</td>
                  <td>${getBrandName(m.brand_id)}</td>
                  <td>${getSeriesName(m.series_id)}</td>
                  <td>${formatDeviceTypeLabel(m.device_type)}</td>
                  <td>${m.release_year ?? '—'}</td>
                  <td>${m.full_path || ''}</td>
                  <td>${coerceFlag(m.is_active) ? 'Active' : 'Inactive'}</td>
                </tr>
              `
                )
                .join('')}
            </tbody>
          </table>
          <script>window.onload = function() { window.print(); }</script>
        </body>
      </html>
    `;
    printWindow.document.write(html);
    printWindow.document.close();
    setShowExportMenu(false);
    toast.success(`Print preview opened for ${filteredModels.length} ${filteredModels.length === 1 ? 'device model' : 'device models'}`);
  };

  const dataCardShell =
    'crm-radius-section border border-border bg-card shadow-[0_1px_3px_rgba(16,24,40,0.06)] overflow-hidden min-w-0';

  const renderSortLabel = (label: string, field?: SortField, showIcon = true) => {
    const active = field != null && sortConfig.field === field;
    return (
      <span className="inline-flex items-center gap-1.5">
        {label}
        {showIcon && (
          <ArrowUpDown className={`w-3.5 h-3.5 shrink-0 ${active ? 'text-gray-700' : 'text-gray-400'}`} />
        )}
      </span>
    );
  };

  const renderStatusBadge = (active: boolean) => (
    <span
      className={`inline-flex items-center px-2.5 py-1 crm-radius-badge text-[11px] font-semibold ${
        active ? 'bg-success text-white' : 'bg-destructive text-white'
      }`}
    >
      {active ? 'Active' : 'Inactive'}
    </span>
  );

  const renderDeviceTypeBadge = (deviceType?: string | null) => {
    if (!deviceType) {
      return <span className="text-[13px] text-muted-foreground">—</span>;
    }
    return (
      <span className="inline-flex items-center px-2 py-0.5 crm-radius-badge text-[11px] font-semibold bg-muted text-muted-foreground capitalize">
        {deviceType}
      </span>
    );
  };

  const renderBrandAvatar = (brand: BrandResponse, size: 'sm' | 'md' = 'md') => {
    const dim = size === 'sm' ? 'w-9 h-9' : 'w-10 h-10';
    return (
      <div
        className={`${dim} crm-radius-icon bg-primary/10 text-primary flex items-center justify-center shrink-0 overflow-hidden`}
      >
        {brand.logo_url ? (
          <img src={getMediaUrl(brand.logo_url)} alt={brand.name} className="w-full h-full object-contain p-1" />
        ) : (
          <Tag className="w-4 h-4" />
        )}
      </div>
    );
  };

  const renderModelAvatar = (model: DeviceModelResponse, size: 'sm' | 'md' = 'md') => {
    const dim = size === 'sm' ? 'w-9 h-9' : 'w-10 h-10';
    return (
      <div
        className={`${dim} crm-radius-icon bg-primary/10 text-primary flex items-center justify-center shrink-0 overflow-hidden`}
      >
        {model.image_url ? (
          <img src={getMediaUrl(model.image_url)} alt={model.name} className="w-full h-full object-cover" />
        ) : (
          <Smartphone className="w-4 h-4" />
        )}
      </div>
    );
  };

  const searchField = (
    <div className="relative flex-1 min-w-[180px] max-w-[480px]">
      <Search className="absolute left-3 top-1/2 -translate-y-1/2 w-4 h-4 text-muted-foreground pointer-events-none" />
      <input
        type="text"
        placeholder="Search"
        value={searchQuery}
        onChange={(e) => setSearchQuery(e.target.value)}
        className="w-full h-9 pl-9 pr-3 crm-radius-control border border-border bg-card text-[13px] text-foreground placeholder:text-muted-foreground focus:outline-none focus:border-primary transition-colors"
      />
    </div>
  );

  const addModelButton = (
    <button
      type="button"
      onClick={handleOpenCreate}
      className="inline-flex items-center gap-2 h-9 px-4 crm-radius-control bg-primary hover:bg-primary/90 text-white text-[13px] font-semibold cursor-pointer shrink-0"
    >
      <span className="w-[18px] h-[18px] rounded-full bg-white text-primary flex items-center justify-center">
        <Plus className="w-3 h-3" strokeWidth={3} />
      </span>
      Add Model
    </button>
  );

  const viewToggle = <ViewModeToggle value={viewMode} onChange={handleViewModeChange} />;

  const renderFilterControl = (align: 'left' | 'right') => {
    const nameQuery = filterSectionSearch.name.trim().toLowerCase();
    const brandQuery = filterSectionSearch.brand.trim().toLowerCase();
    const seriesQuery = filterSectionSearch.series.trim().toLowerCase();
    const filteredNameOptions = sortedModelFilterOptions.filter(
      (model) =>
        !nameQuery ||
        model.name.toLowerCase().includes(nameQuery) ||
        (model.slug || '').toLowerCase().includes(nameQuery)
    );
    const filteredBrandOptions = sortedBrandFilterOptions.filter(
      (brand) =>
        !brandQuery ||
        brand.name.toLowerCase().includes(brandQuery) ||
        (brand.slug || '').toLowerCase().includes(brandQuery)
    );
    const filteredSeriesOptions = sortedSeriesFilterOptions.filter(
      (s) =>
        !seriesQuery ||
        s.name.toLowerCase().includes(seriesQuery) ||
        (s.slug || '').toLowerCase().includes(seriesQuery)
    );
    const visibleNameOptions = filteredNameOptions.slice(0, filterVisibleCounts.name);
    const visibleBrandOptions = filteredBrandOptions.slice(0, filterVisibleCounts.brand);
    const visibleSeriesOptions = filteredSeriesOptions.slice(0, filterVisibleCounts.series);

    const renderSectionSearch = (
      section: 'name' | 'brand' | 'series',
      value: string,
      onChange: (next: string) => void
    ) => (
      <div className="relative">
        <Search className="absolute left-2.5 top-1/2 -translate-y-1/2 w-3.5 h-3.5 text-muted-foreground pointer-events-none" />
        <input
          type="text"
          placeholder="Search"
          value={value}
          onChange={(e) => {
            onChange(e.target.value);
            setFilterVisibleCounts((prev) => ({ ...prev, [section]: FILTER_PAGE_SIZE }));
          }}
          className="w-full h-8 pl-8 pr-3 crm-radius-control border border-border bg-card text-[12px] text-foreground placeholder:text-muted-foreground focus:outline-none focus:border-primary"
        />
      </div>
    );

    const renderCheckboxOption = (
      checked: boolean,
      onToggle: () => void,
      label: string,
      icon?: ReactNode
    ) => (
      <label className="flex items-center gap-2.5 py-1.5 cursor-pointer">
        <input
          type="checkbox"
          checked={checked}
          onChange={onToggle}
          className="w-3.5 h-3.5 rounded-[3px] border-border text-primary focus:ring-primary cursor-pointer"
        />
        {icon}
        <span className="text-[13px] text-muted-foreground">{label}</span>
      </label>
    );

    return (
      <div className="relative shrink-0" ref={filterRef}>
        <button
          type="button"
          onClick={() => (showFilterPanel ? setShowFilterPanel(false) : openFilterPanel())}
          className={`inline-flex items-center gap-1.5 h-9 px-3 crm-radius-control text-[13px] font-medium cursor-pointer transition-colors ${
            showFilterPanel || filtersActive
              ? 'bg-primary text-white'
              : 'border border-border bg-card text-foreground hover:bg-muted'
          }`}
        >
          <Filter className="w-3.5 h-3.5" />
          Filter
          {filtersActive && !showFilterPanel && <span className="w-1.5 h-1.5 rounded-full bg-white" />}
          <ChevronDown
            className={`w-3.5 h-3.5 transition-transform ${showFilterPanel ? 'rotate-180' : ''} ${
              showFilterPanel || filtersActive ? 'text-white/80' : 'text-muted-foreground'
            }`}
          />
        </button>
        <AnimatePresence>
          {showFilterPanel && (
            <motion.div
              initial={{ opacity: 0, y: -6 }}
              animate={{ opacity: 1, y: 0 }}
              exit={{ opacity: 0, y: -6 }}
              transition={{ duration: 0.16, ease: 'easeOut' }}
              className={`absolute ${align === 'right' ? 'right-0' : 'left-0'} top-full mt-1.5 z-50 w-[320px] max-w-[calc(100vw-2rem)] crm-radius-card border border-border bg-card shadow-lg overflow-hidden`}
            >
              <div className="flex items-center justify-between px-4 py-3 border-b border-border">
                <span className="inline-flex items-center gap-2 text-[14px] font-semibold text-foreground">
                  <Filter className="w-4 h-4" />
                  Filter
                </span>
                <button
                  type="button"
                  aria-label="Close filters"
                  onClick={() => setShowFilterPanel(false)}
                  className="w-7 h-7 rounded-full bg-primary/10 text-primary hover:bg-primary hover:text-white cursor-pointer transition-colors flex items-center justify-center"
                >
                  <X className="w-3.5 h-3.5" />
                </button>
              </div>

              <div className="max-h-[420px] overflow-y-auto">
                <div className="border-b border-border">
                  <button
                    type="button"
                    onClick={() => toggleFilterSection('name')}
                    className="w-full flex items-center gap-2 px-4 py-3 text-[13px] font-semibold text-foreground hover:bg-muted/20 cursor-pointer"
                  >
                    <ChevronRight
                      className={`w-3.5 h-3.5 transition-transform ${expandedFilterSections.name ? 'rotate-90' : ''}`}
                    />
                    Model Name
                  </button>
                  {expandedFilterSections.name && (
                    <div className="px-4 pb-4">
                      <div className="crm-radius-control border border-border bg-muted/20 p-3 space-y-2">
                        {renderSectionSearch('name', filterSectionSearch.name, (value) =>
                          setFilterSectionSearch((prev) => ({ ...prev, name: value }))
                        )}
                        <div className="space-y-0.5">
                          {visibleNameOptions.length === 0 ? (
                            <p className="py-2 text-[12px] text-muted-foreground">No models found.</p>
                          ) : (
                            visibleNameOptions.map((model) => {
                              const id = normalizeId(model.model_id);
                              return renderCheckboxOption(
                                draftFilters.modelIds.includes(id),
                                () => toggleDraftListValue('modelIds', id),
                                model.name,
                                renderModelAvatar(model, 'sm')
                              );
                            })
                          )}
                        </div>
                        {filteredNameOptions.length > visibleNameOptions.length && (
                          <button
                            type="button"
                            onClick={() =>
                              setFilterVisibleCounts((prev) => ({
                                ...prev,
                                name: prev.name + FILTER_PAGE_SIZE,
                              }))
                            }
                            className="text-[12px] font-medium text-primary underline underline-offset-2 cursor-pointer"
                          >
                            Load More
                          </button>
                        )}
                      </div>
                    </div>
                  )}
                </div>

                <div className="border-b border-border">
                  <button
                    type="button"
                    onClick={() => toggleFilterSection('brand')}
                    className="w-full flex items-center gap-2 px-4 py-3 text-[13px] font-semibold text-foreground hover:bg-muted/20 cursor-pointer"
                  >
                    <ChevronRight
                      className={`w-3.5 h-3.5 transition-transform ${expandedFilterSections.brand ? 'rotate-90' : ''}`}
                    />
                    Brand
                  </button>
                  {expandedFilterSections.brand && (
                    <div className="px-4 pb-4">
                      <div className="crm-radius-control border border-border bg-muted/20 p-3 space-y-2">
                        {renderSectionSearch('brand', filterSectionSearch.brand, (value) =>
                          setFilterSectionSearch((prev) => ({ ...prev, brand: value }))
                        )}
                        <div className="space-y-0.5">
                          {visibleBrandOptions.length === 0 ? (
                            <p className="py-2 text-[12px] text-muted-foreground">No brands found.</p>
                          ) : (
                            visibleBrandOptions.map((brand) => {
                              const id = normalizeId(brand.brand_id);
                              return renderCheckboxOption(
                                draftFilters.brandIds.includes(id),
                                () => toggleDraftListValue('brandIds', id),
                                brand.name,
                                renderBrandAvatar(brand, 'sm')
                              );
                            })
                          )}
                        </div>
                        {filteredBrandOptions.length > visibleBrandOptions.length && (
                          <button
                            type="button"
                            onClick={() =>
                              setFilterVisibleCounts((prev) => ({
                                ...prev,
                                brand: prev.brand + FILTER_PAGE_SIZE,
                              }))
                            }
                            className="text-[12px] font-medium text-primary underline underline-offset-2 cursor-pointer"
                          >
                            Load More
                          </button>
                        )}
                      </div>
                    </div>
                  )}
                </div>

                <div className="border-b border-border">
                  <button
                    type="button"
                    onClick={() => toggleFilterSection('series')}
                    className="w-full flex items-center gap-2 px-4 py-3 text-[13px] font-semibold text-foreground hover:bg-muted/20 cursor-pointer"
                  >
                    <ChevronRight
                      className={`w-3.5 h-3.5 transition-transform ${expandedFilterSections.series ? 'rotate-90' : ''}`}
                    />
                    Series
                  </button>
                  {expandedFilterSections.series && (
                    <div className="px-4 pb-4">
                      <div className="crm-radius-control border border-border bg-muted/20 p-3 space-y-2">
                        {renderSectionSearch('series', filterSectionSearch.series, (value) =>
                          setFilterSectionSearch((prev) => ({ ...prev, series: value }))
                        )}
                        <div className="space-y-0.5">
                          {visibleSeriesOptions.length === 0 ? (
                            <p className="py-2 text-[12px] text-muted-foreground">No series found.</p>
                          ) : (
                            visibleSeriesOptions.map((s) => {
                              const id = normalizeId(s.series_id);
                              return renderCheckboxOption(
                                draftFilters.seriesIds.includes(id),
                                () => toggleDraftListValue('seriesIds', id),
                                s.name,
                                (
                                  <div className="w-7 h-7 crm-radius-icon bg-primary/10 text-primary flex items-center justify-center shrink-0">
                                    <Smartphone className="w-3.5 h-3.5" />
                                  </div>
                                )
                              );
                            })
                          )}
                        </div>
                        {filteredSeriesOptions.length > visibleSeriesOptions.length && (
                          <button
                            type="button"
                            onClick={() =>
                              setFilterVisibleCounts((prev) => ({
                                ...prev,
                                series: prev.series + FILTER_PAGE_SIZE,
                              }))
                            }
                            className="text-[12px] font-medium text-primary underline underline-offset-2 cursor-pointer"
                          >
                            Load More
                          </button>
                        )}
                      </div>
                    </div>
                  )}
                </div>

                <div className="border-b border-border">
                  <button
                    type="button"
                    onClick={() => toggleFilterSection('deviceTypes')}
                    className="w-full flex items-center gap-2 px-4 py-3 text-[13px] font-semibold text-foreground hover:bg-muted/20 cursor-pointer"
                  >
                    <ChevronRight
                      className={`w-3.5 h-3.5 transition-transform ${expandedFilterSections.deviceTypes ? 'rotate-90' : ''}`}
                    />
                    Device Type
                  </button>
                  {expandedFilterSections.deviceTypes && (
                    <div className="px-4 pb-4">
                      <div className="crm-radius-control border border-border bg-muted/20 p-3 space-y-1">
                        {DEVICE_TYPES.map((dt) =>
                          renderCheckboxOption(
                            draftFilters.deviceTypes.includes(dt),
                            () => toggleDraftListValue('deviceTypes', dt),
                            dt.charAt(0).toUpperCase() + dt.slice(1)
                          )
                        )}
                      </div>
                    </div>
                  )}
                </div>

                <div>
                  <button
                    type="button"
                    onClick={() => toggleFilterSection('status')}
                    className="w-full flex items-center gap-2 px-4 py-3 text-[13px] font-semibold text-foreground hover:bg-muted/20 cursor-pointer"
                  >
                    <ChevronRight
                      className={`w-3.5 h-3.5 transition-transform ${expandedFilterSections.status ? 'rotate-90' : ''}`}
                    />
                    Status
                  </button>
                  {expandedFilterSections.status && (
                    <div className="px-4 pb-4">
                      <div className="crm-radius-control border border-border bg-muted/20 p-3 space-y-1">
                        {renderCheckboxOption(
                          draftFilters.statuses.includes('active'),
                          () => toggleDraftListValue('statuses', 'active'),
                          'Active'
                        )}
                        {renderCheckboxOption(
                          draftFilters.statuses.includes('inactive'),
                          () => toggleDraftListValue('statuses', 'inactive'),
                          'Inactive'
                        )}
                      </div>
                    </div>
                  )}
                </div>
              </div>

              <div className="flex items-center gap-3 px-4 py-3 border-t border-border">
                <button
                  type="button"
                  onClick={() => {
                    setDraftFilters(EMPTY_FILTERS);
                    setActiveFilters(EMPTY_FILTERS);
                    setShowFilterPanel(false);
                  }}
                  className="flex-1 h-9 crm-radius-control border border-border bg-card text-[13px] font-medium text-foreground hover:bg-muted cursor-pointer"
                >
                  Reset
                </button>
                <button
                  type="button"
                  onClick={() => {
                    setActiveFilters(draftFilters);
                    setShowFilterPanel(false);
                  }}
                  className="flex-1 h-9 crm-radius-control bg-primary text-white text-[13px] font-semibold cursor-pointer hover:bg-primary/90"
                >
                  Filter
                </button>
              </div>
            </motion.div>
          )}
        </AnimatePresence>
      </div>
    );
  };

  const manageColumnsControl = (
    <div className="relative shrink-0" ref={columnsRef}>
      <button
        type="button"
        onClick={() => {
          const next = !showColumnsPanel;
          setShowFilterPanel(false);
          setShowSortPanel(false);
          setShowColumnsPanel(next);
        }}
        className="inline-flex items-center gap-1.5 h-9 px-3 crm-radius-control text-[13px] font-medium cursor-pointer transition-colors bg-primary/10 text-primary border border-primary/25 hover:bg-primary/15"
      >
        <Columns3 className="w-3.5 h-3.5" />
        Manage Columns
      </button>
      {showColumnsPanel && (
        <div className="absolute right-0 top-full mt-1.5 z-50 w-[240px] crm-radius-card border border-border bg-card shadow-lg py-1.5 overflow-hidden">
          {COLUMN_OPTIONS.map((col) => (
            <div key={col.key} className="flex items-center gap-2 px-3 py-1.5">
              <GripVertical className="w-3.5 h-3.5 text-muted-foreground shrink-0" />
              <span className="flex-1 text-[13px] text-foreground truncate">{col.label}</span>
              <button
                type="button"
                role="switch"
                aria-checked={visibleColumns[col.key]}
                aria-label={`Toggle ${col.label}`}
                disabled={col.locked}
                title={col.locked ? 'Model Name stays visible' : `Toggle ${col.label}`}
                onClick={() => toggleColumn(col.key)}
                className={`relative w-8 h-[18px] rounded-full shrink-0 transition-colors ${
                  visibleColumns[col.key] ? 'bg-primary' : 'bg-muted'
                } ${col.locked ? 'opacity-60 cursor-not-allowed' : 'cursor-pointer'}`}
              >
                <span
                  className={`absolute top-[2px] w-3.5 h-3.5 rounded-full bg-white shadow-xs transition-all ${
                    visibleColumns[col.key] ? 'left-[14px]' : 'left-[2px]'
                  }`}
                />
              </button>
            </div>
          ))}
        </div>
      )}
    </div>
  );

  const sortControl = (
    <div className="relative shrink-0" ref={sortRef}>
      <button
        type="button"
        onClick={() => {
          const next = !showSortPanel;
          setShowFilterPanel(false);
          setShowColumnsPanel(false);
          setShowSortPanel(next);
        }}
        className={`inline-flex items-center gap-1.5 h-9 px-3 crm-radius-control border border-border text-[13px] font-medium cursor-pointer transition-colors ${
          showSortPanel || sortConfig.field !== DEFAULT_SORT.field || sortConfig.dir !== DEFAULT_SORT.dir
            ? 'bg-muted text-foreground'
            : 'bg-card text-foreground hover:bg-muted'
        }`}
      >
        <ArrowUpDown className="w-3.5 h-3.5" />
        Sort By
        <ChevronDown
          className={`w-3.5 h-3.5 text-muted-foreground transition-transform ${showSortPanel ? 'rotate-180' : ''}`}
        />
      </button>
      {showSortPanel && (
        <div className="absolute left-0 top-full mt-1.5 z-50 w-56 crm-radius-card border border-border bg-card shadow-lg py-1 overflow-hidden">
          {SORT_OPTIONS.map((option) => {
            const active = option.field === sortConfig.field && option.dir === sortConfig.dir;
            return (
              <button
                key={`${option.field}-${option.dir}`}
                type="button"
                onClick={() => {
                  setSortConfig({ field: option.field, dir: option.dir });
                  setShowSortPanel(false);
                }}
                className={`w-full text-left px-3 py-1.5 text-[13px] cursor-pointer ${
                  active ? 'bg-primary/10 text-primary font-medium' : 'text-foreground hover:bg-muted'
                }`}
              >
                {option.label}
              </button>
            );
          })}
        </div>
      )}
    </div>
  );

  const emptyMessage =
    searchQuery || filtersActive ? 'No device models match your search.' : 'No device models found.';

  return (
    <div className="flex flex-col gap-5 min-w-0">
      <div className="flex flex-wrap items-start justify-between gap-3 min-w-0">
        <div className="min-w-0">
          <div className="flex items-center gap-2">
            <h1 className="text-lg font-semibold text-foreground">Device Models</h1>
            <span className="inline-flex items-center justify-center min-w-5 h-5 px-1.5 crm-radius-toggle bg-primary/10 text-primary text-[11px] font-semibold leading-none">
              {models.length}
            </span>
          </div>
        </div>

        <div className="flex items-center gap-3 shrink-0">
          <div className="relative" ref={exportRef}>
            <button
              type="button"
              onClick={() => setShowExportMenu((open) => !open)}
              className="inline-flex items-center gap-1.5 h-8 px-2.5 crm-radius-control border border-border bg-card text-[13px] font-medium text-foreground hover:bg-muted cursor-pointer"
            >
              <Box className="w-3.5 h-3.5" />
              Export
              <ChevronDown className="w-3.5 h-3.5 text-muted-foreground" />
            </button>
            {showExportMenu && (
              <div className="absolute right-0 top-full mt-1.5 z-50 w-48 crm-radius-card border border-border bg-card shadow-lg py-1 overflow-hidden">
                <button
                  type="button"
                  onClick={handleExportPDF}
                  className="w-full flex items-center gap-2 px-3 py-2 text-[13px] text-muted-foreground hover:bg-muted hover:text-foreground cursor-pointer"
                >
                  <FileText className="w-4 h-4 text-destructive" />
                  Export as PDF
                </button>
                <button
                  type="button"
                  onClick={handleExportExcel}
                  className="w-full flex items-center gap-2 px-3 py-2 text-[13px] text-muted-foreground hover:bg-muted hover:text-foreground cursor-pointer"
                >
                  <FileSpreadsheet className="w-4 h-4 text-green-600" />
                  Export as Excel
                </button>
              </div>
            )}
          </div>

          <button
            type="button"
            onClick={fetchData}
            className="w-8 h-8 crm-radius-control border border-border bg-card text-muted-foreground hover:text-foreground hover:bg-muted cursor-pointer transition-colors flex items-center justify-center"
            title="Reload Data"
          >
            <RefreshCw className="w-3.5 h-3.5" />
          </button>
        </div>
      </div>

      {viewMode === 'grid' ? (
        <div className={dataCardShell}>
          <div className="px-5 pt-5">
            <div className="-mx-5 px-5 flex flex-wrap items-center justify-between gap-3 min-w-0 pb-4 border-b border-border">
              <div className="flex flex-wrap items-center gap-3 min-w-0 flex-1">
                {renderFilterControl('left')}
                {searchField}
              </div>
              <div className="flex items-center gap-3 shrink-0">
                {viewToggle}
                {addModelButton}
              </div>
            </div>
          </div>

          {loading ? (
            <div className="flex flex-col items-center justify-center py-16 gap-2.5">
              <RefreshCw className="w-6 h-6 text-primary animate-spin" />
              <span className="text-[13px] text-muted-foreground">Loading device models...</span>
            </div>
          ) : filteredModels.length === 0 ? (
            <div className="py-12 text-center text-[13px] text-muted-foreground">{emptyMessage}</div>
          ) : (
            <div className="p-5 mt-4">
              <div className="grid grid-cols-1 sm:grid-cols-2 lg:grid-cols-3 xl:grid-cols-4 gap-4">
                {pager.items.map((m) => (
                  <div
                    key={m.model_id}
                    className="relative crm-radius-section border border-border bg-card p-5 min-w-0 shadow-sm hover:shadow-md transition-shadow"
                  >
                    <div className="absolute top-4 right-4 z-10">
                      <RowActionsMenu
                        open={openActionId === m.model_id}
                        onOpenChange={(open) => setOpenActionId(open ? m.model_id : null)}
                        onEdit={() => handleOpenEdit(m)}
                        onDelete={() => openDeleteModal(m.model_id, m.name)}
                      />
                    </div>
                    <div className="flex items-start gap-3 pr-8 min-w-0">
                      {renderModelAvatar(m, 'md')}
                      <div className="min-w-0">
                        <p className="text-[14px] font-semibold text-foreground truncate">{m.name}</p>
                        <p className="text-[12px] text-muted-foreground truncate mt-0.5">{m.slug}</p>
                      </div>
                    </div>
                    <div className="mt-4 space-y-1.5 text-[12px] text-muted-foreground">
                      <p>Brand: {getBrandName(m.brand_id)}</p>
                      <p>Series: {getSeriesName(m.series_id)}</p>
                      {m.release_year && <p>Release Year: {m.release_year}</p>}
                      {m.full_path && (
                        <p className="font-mono text-[11px] truncate" title={m.full_path}>
                          {m.full_path}
                        </p>
                      )}
                    </div>
                    <div className="mt-4 flex flex-wrap items-center gap-2">
                      {renderDeviceTypeBadge(m.device_type)}
                      {renderStatusBadge(coerceFlag(m.is_active))}
                    </div>
                  </div>
                ))}
              </div>
            </div>
          )}
          <TablePagination {...pager} />
        </div>
      ) : (
        <div className={dataCardShell}>
          <div className="px-5 pt-5">
            <div className="flex flex-wrap items-center justify-between gap-4 w-full min-w-0 pb-4 border-b border-border">
              {searchField}
              {addModelButton}
            </div>
            <div className="flex flex-wrap lg:flex-nowrap items-center justify-between gap-3 w-full min-w-0 py-4">
              <div className="flex flex-wrap items-center gap-2 min-w-0">{sortControl}</div>
              <div className="flex flex-wrap items-center gap-2 shrink-0">
                {renderFilterControl('right')}
                {manageColumnsControl}
                {viewToggle}
              </div>
            </div>
          </div>

          {loading ? (
            <div className="flex flex-col items-center justify-center py-16 gap-2.5 border-t border-border">
              <RefreshCw className="w-6 h-6 text-primary animate-spin" />
              <span className="text-[13px] text-muted-foreground">Loading device models...</span>
            </div>
          ) : (
            <div className="overflow-x-auto border-t border-border">
              <table className="crm-data-table min-w-[1020px]">
                <thead>
                  <tr className="bg-gray-50 border-y border-gray-200">
                    {visibleColumns.modelName && (
                      <th className="px-5 py-3 text-left text-[13px] font-semibold text-gray-700 whitespace-nowrap">
                        {renderSortLabel('Model Name', 'name')}
                      </th>
                    )}
                    {visibleColumns.slug && (
                      <th className="px-5 py-3 text-left text-[13px] font-semibold text-gray-700 whitespace-nowrap">
                        {renderSortLabel('Slug / Path', 'slug')}
                      </th>
                    )}
                    {visibleColumns.brand && (
                      <th className="px-5 py-3 text-left text-[13px] font-semibold text-gray-700 whitespace-nowrap">
                        {renderSortLabel('Brand', 'brand')}
                      </th>
                    )}
                    {visibleColumns.series && (
                      <th className="px-5 py-3 text-left text-[13px] font-semibold text-gray-700 whitespace-nowrap">
                        {renderSortLabel('Series', 'series')}
                      </th>
                    )}
                    {visibleColumns.deviceType && (
                      <th className="px-5 py-3 text-left text-[13px] font-semibold text-gray-700 whitespace-nowrap">
                        {renderSortLabel('Device Type')}
                      </th>
                    )}
                    {visibleColumns.releaseYear && (
                      <th className="px-5 py-3 text-left text-[13px] font-semibold text-gray-700 whitespace-nowrap">
                        {renderSortLabel('Release Year', 'releaseYear')}
                      </th>
                    )}
                    {visibleColumns.fullPath && (
                      <th className="px-5 py-3 text-left text-[13px] font-semibold text-gray-700 whitespace-nowrap">
                        {renderSortLabel('Full Path')}
                      </th>
                    )}
                    {visibleColumns.status && (
                      <th className="px-5 py-3 text-left text-[13px] font-semibold text-gray-700 whitespace-nowrap">
                        {renderSortLabel('Status', 'status')}
                      </th>
                    )}
                    {visibleColumns.actions && (
                      <th className="px-5 py-3 text-center text-[13px] font-semibold text-gray-700 whitespace-nowrap">
                        {renderSortLabel('Action')}
                      </th>
                    )}
                  </tr>
                </thead>
                <tbody className="bg-card">
                  {filteredModels.length === 0 ? (
                    <tr>
                      <td
                        colSpan={Math.max(visibleColumnCount, 1)}
                        className="text-center py-12 text-[13px] text-muted-foreground"
                      >
                        {emptyMessage}
                      </td>
                    </tr>
                  ) : (
                    pager.items.map((m) => (
                      <tr key={m.model_id} className="border-t border-border hover:bg-muted/10 transition-colors">
                        {visibleColumns.modelName && (
                          <td className="px-5 py-3.5">
                            <div className="flex items-center gap-3 min-w-0">
                              {renderModelAvatar(m, 'sm')}
                              <div className="min-w-0">
                                <p className="text-[13px] font-semibold text-foreground truncate">{m.name}</p>
                                <p className="text-[11px] text-muted-foreground truncate">{m.slug}</p>
                              </div>
                            </div>
                          </td>
                        )}
                        {visibleColumns.slug && (
                          <td className="px-5 py-3.5 font-mono text-muted-foreground">
                            <span className="crm-cell-clip max-w-[180px]" title={m.slug}>{m.slug}</span>
                          </td>
                        )}
                        {visibleColumns.brand && (
                          <td className="px-5 py-3.5 text-[13px] text-muted-foreground">{getBrandName(m.brand_id)}</td>
                        )}
                        {visibleColumns.series && (
                          <td className="px-5 py-3.5 text-[13px] text-muted-foreground">{getSeriesName(m.series_id)}</td>
                        )}
                        {visibleColumns.deviceType && (
                          <td className="px-5 py-3.5">{renderDeviceTypeBadge(m.device_type)}</td>
                        )}
                        {visibleColumns.releaseYear && (
                          <td className="px-5 py-3.5 text-[13px] text-muted-foreground">{m.release_year ?? '—'}</td>
                        )}
                        {visibleColumns.fullPath && (
                          <td className="px-5 py-3.5 font-mono text-muted-foreground">
                            <span className="crm-cell-clip max-w-[200px]" title={m.full_path || ''}>{m.full_path || '—'}</span>
                          </td>
                        )}
                        {visibleColumns.status && (
                          <td className="px-5 py-3.5">{renderStatusBadge(coerceFlag(m.is_active))}</td>
                        )}
                        {visibleColumns.actions && (
                          <td className="px-5 py-3.5">
                            <div className="flex items-center justify-center">
                              <RowActionsMenu
                                open={openActionId === m.model_id}
                                onOpenChange={(open) => setOpenActionId(open ? m.model_id : null)}
                                onEdit={() => handleOpenEdit(m)}
                                onDelete={() => openDeleteModal(m.model_id, m.name)}
                              />
                            </div>
                          </td>
                        )}
                      </tr>
                    ))
                  )}
                </tbody>
              </table>
            </div>
          )}
          <TablePagination {...pager} />
        </div>
      )}

      {deleteTarget && (
        <div
          className="fixed inset-0 z-[100] flex items-center justify-center bg-black/50 p-4"
          onClick={closeDeleteModal}
        >
          <div
            role="dialog"
            aria-modal="true"
            aria-labelledby="delete-model-title"
            className="bg-card border border-border shadow-2xl w-full max-w-sm overflow-hidden crm-radius-none"
            onClick={(e) => e.stopPropagation()}
          >
            <div className="flex items-start justify-between gap-3 px-5 pt-5 pb-2">
              <div className="flex items-start gap-3 min-w-0">
                <div className="w-10 h-10 rounded-full bg-destructive/10 text-destructive flex items-center justify-center shrink-0">
                  <AlertTriangle className="w-5 h-5" />
                </div>
                <div className="min-w-0">
                  <h3 id="delete-model-title" className="text-[15px] font-semibold text-foreground">
                    Delete Device Model
                  </h3>
                  <p className="text-[13px] text-muted-foreground mt-1 leading-relaxed">
                    Are you sure you want to delete{' '}
                    <span className="font-semibold text-foreground">&quot;{deleteTarget.name}&quot;</span> and all its
                    related repair services?
                  </p>
                </div>
              </div>
              <button
                type="button"
                aria-label="Close delete dialog"
                onClick={closeDeleteModal}
                disabled={isDeleting}
                className="w-8 h-8 rounded-full border border-border text-muted-foreground hover:bg-muted cursor-pointer transition-colors flex items-center justify-center shrink-0 disabled:opacity-50"
              >
                <X className="w-4 h-4" />
              </button>
            </div>
            <div className="flex items-center justify-end gap-2 px-5 pb-5 pt-3">
              <button
                type="button"
                onClick={closeDeleteModal}
                disabled={isDeleting}
                className="h-9 px-4 crm-radius-control border border-border bg-card text-[13px] font-medium text-foreground hover:bg-muted cursor-pointer transition-colors disabled:opacity-50"
              >
                Cancel
              </button>
              <button
                type="button"
                onClick={handleConfirmDelete}
                disabled={isDeleting}
                className="h-9 px-4 crm-radius-control bg-destructive hover:bg-destructive/90 text-white text-[13px] font-semibold cursor-pointer transition-colors disabled:opacity-50 inline-flex items-center gap-2"
              >
                {isDeleting ? (
                  <>
                    <RefreshCw className="w-3.5 h-3.5 animate-spin" />
                    Deleting...
                  </>
                ) : (
                  <>
                    <Trash2 className="w-3.5 h-3.5" />
                    Delete Model
                  </>
                )}
              </button>
            </div>
          </div>
        </div>
      )}

      <SlideOver
        open={showModelDrawer}
        onClose={closeModelDrawer}
        title={editingModel ? 'Edit Device Model' : 'Create Device Model'}
        icon={<Smartphone className="w-4 h-4 text-primary shrink-0" />}
      >
        <form onSubmit={handleSubmitModel} className="flex min-h-0 flex-1 flex-col">
          <div className="flex-1 min-h-0 overflow-y-auto px-5 py-4 space-y-4">
            <div className="grid grid-cols-2 gap-4">
              <div>
                <label className="block text-[11px] font-semibold text-muted-foreground uppercase mb-1.5">
                  Brand <span className="text-primary">*</span>
                </label>
                <CustomSelect
                  value={modelBrandId}
                  onChange={handleBrandChange}
                  placeholder="- Select Brand -"
                  options={[
                    { value: '', label: '- Select Brand -' },
                    ...brands.map((brand) => ({ value: brand.brand_id, label: brand.name })),
                  ]}
                />
              </div>

              <div>
                <label className="block text-[11px] font-semibold text-muted-foreground uppercase mb-1.5">
                  Device Type
                </label>
                <CustomSelect
                  value={modelDeviceType}
                  disabled={!modelBrandId}
                  onChange={handleDeviceTypeChange}
                  placeholder="- Select Device Type -"
                  options={[
                    { value: '', label: '- Select Device Type -' },
                    ...brandDeviceTypes.map((dt) => ({ value: dt, label: dt })),
                  ]}
                />
              </div>
            </div>

            {modelBrandId && modelDeviceType && (
              <div className="grid grid-cols-2 gap-4">
                <div>
                  <label className="block text-[11px] font-semibold text-muted-foreground uppercase mb-1.5">
                    Series (Optional)
                  </label>
                  <CustomSelect
                    value={modelSeriesId}
                    onChange={setModelSeriesId}
                    placeholder="- Series (Optional) -"
                    options={[
                      { value: '', label: '- Series (Optional) -' },
                      ...seriesList
                        .filter(
                          (s) => idsEqual(s.brand_id, modelBrandId) && s.device_type === modelDeviceType
                        )
                        .map((s) => ({ value: s.series_id, label: s.name })),
                    ]}
                  />
                </div>

                <div>
                  <label className="block text-[11px] font-semibold text-muted-foreground uppercase mb-1.5">
                    Model Name <span className="text-primary">*</span>
                  </label>
                  <input
                    type="text"
                    placeholder="e.g. Galaxy S24 Ultra"
                    value={modelName}
                    onChange={(e) => setModelName(e.target.value)}
                    className="w-full h-9 px-3 bg-card border border-border crm-radius-control text-[13px] text-foreground focus:outline-none focus:border-primary transition-colors"
                  />
                </div>
              </div>
            )}

            <div className="grid grid-cols-2 gap-4">
              <div>
                <label className="block text-[11px] font-semibold text-muted-foreground uppercase mb-1.5">
                  Release Year
                </label>
                <input
                  type="number"
                  placeholder="2026"
                  value={modelReleaseYear}
                  onChange={(e) => setModelReleaseYear(e.target.value)}
                  className="w-full h-9 px-3 bg-card border border-border crm-radius-control text-[13px] text-foreground focus:outline-none focus:border-primary transition-colors"
                />
              </div>
              <div>
                <label className="block text-[11px] font-semibold text-muted-foreground uppercase mb-1.5">
                  Device Image
                </label>
                <ImageUpload
                  entityType="model"
                  entityId={editingModel?.model_id || ''}
                  value={modelImg}
                  onUploadSuccess={(url) => setModelImg(url)}
                  onClear={() => setModelImg('')}
                />
              </div>
            </div>
          </div>

          <div className="shrink-0 border-t border-border px-5 py-3 flex items-center justify-end gap-2 bg-card">
            <button
              type="button"
              onClick={closeModelDrawer}
              disabled={isSubmitting}
              className="h-8 px-3.5 bg-card hover:bg-muted border border-border text-foreground crm-radius-control text-[13px] font-medium transition-colors cursor-pointer disabled:opacity-50"
            >
              Cancel
            </button>
            <button
              type="submit"
              disabled={isSubmitting}
              className="h-8 px-3.5 bg-primary hover:bg-primary/90 text-primary-foreground crm-radius-control text-[13px] font-medium transition-colors cursor-pointer disabled:opacity-60"
            >
              {isSubmitting ? 'Saving...' : editingModel ? 'Save Changes' : 'Create Model'}
            </button>
          </div>
        </form>
      </SlideOver>
    </div>
  );
}