import React, { useState, useMemo } from 'react';
import { ExcelRow, COLUMNS } from '../types';
import { AlertTriangle, CheckCircle2, ChevronDown, ChevronRight, Edit2, Package, Boxes, Scale, Loader2, RefreshCw, Layers, Link2, Search, Filter, X as XIcon, Undo2 } from 'lucide-react';
import { cn } from '../lib/utils';
import { ConfirmModal } from './ConfirmModal';
import { ColumnFilterPopover } from './ColumnFilterPopover';

interface DimensionsViewProps {
  data: ExcelRow[];
  headers: string[];
  onEdit: (index: number) => void;
  onSaveRow: (index: number, updatedRow: ExcelRow) => void;
  onCaptureState: (message: string) => void;
  rowStatuses: Record<string, string>;
  onRevertRow: (articleNo: string) => void;
}

interface DimensionGroup {
  key: string;
  innerDims: string;
  rows: { row: ExcelRow; index: number }[];
  isInconsistent: boolean;
  volume: number;
  discrepancies: {
    outer: boolean;
    units: boolean;
    moq: boolean;
  };
}

interface NearDuplicateCluster {
  groups: DimensionGroup[];
  volumes: number[];
  maxDiffPct: number;
}

export function DimensionsView({ data, headers, onEdit, onSaveRow, onCaptureState, rowStatuses, onRevertRow }: DimensionsViewProps) {
  const [expandedGroups, setExpandedGroups] = useState<Set<string>>(new Set());
  const [expandedNearDuplicates, setExpandedNearDuplicates] = useState<Set<number>>(new Set());
  const [showOnlyInconsistent, setShowOnlyInconsistent] = useState(true);
  const [syncing, setSyncing] = useState<{ key: string, field: string } | null>(null);
  const [pendingAction, setPendingAction] = useState<{
    group: DimensionGroup,
    sourceRow: ExcelRow,
    fieldType: 'outer' | 'units' | 'moq' | 'all'
  } | null>(null);
  const [clusterSelections, setClusterSelections] = useState<Record<number, Set<number>>>({});
  const [clusterSyncTargets, setClusterSyncTargets] = useState<Record<number, string>>({});
  const [pendingNearDupSync, setPendingNearDupSync] = useState<{
    clusterKey: string;
    targetGroupKey: string;
    selectedIndices: number[];
  } | null>(null);
  const [search, setSearch] = useState('');
  const [lineFilter, setLineFilter] = useState<string[]>([]);
  const [classFilter, setClassFilter] = useState<string[]>([]);
  const [openFilter, setOpenFilter] = useState<'line' | 'class' | null>(null);

  const groups = useMemo(() => {
    const groupMap = new Map<string, { row: ExcelRow; index: number }[]>();

    data.forEach((row, index) => {
      const iw = String(row[COLUMNS.INNER_W] || '0').trim();
      const il = String(row[COLUMNS.INNER_L] || '0').trim();
      const ih = String(row[COLUMNS.INNER_H] || '0').trim();

      // Normalize key by sorting dimension values so different orderings
      // (e.g. "29x10x15" vs "10x29x15") are treated as the same group
      const sortedDims = [parseFloat(il) || 0, parseFloat(iw) || 0, parseFloat(ih) || 0]
        .sort((a, b) => a - b);
      const key = sortedDims.join('x');
      if (!groupMap.has(key)) {
        groupMap.set(key, []);
      }
      groupMap.get(key)!.push({ row, index });
    });

    const result: DimensionGroup[] = [];
    groupMap.forEach((rows, key) => {
      // Skip empty/placeholder groups (0x0x0 or empty fields)
      if (key === '0x0x0' || key === 'xx' || key === 'x x') return; 

      const first = rows[0].row;
      const firstOuter = `${first[COLUMNS.OUTER_L]}x${first[COLUMNS.OUTER_W]}x${first[COLUMNS.OUTER_H]}`;
      const firstUnits = String(first[COLUMNS.UNITS_OUTER]);
      const firstMOQ = String(first[COLUMNS.MOQ]);

      let outerMatch = true;
      let unitsMatch = true;
      let moqMatch = true;

      rows.forEach(({ row }) => {
        const outer = `${row[COLUMNS.OUTER_L]}x${row[COLUMNS.OUTER_W]}x${row[COLUMNS.OUTER_H]}`;
        const units = String(row[COLUMNS.UNITS_OUTER]);
        const moq = String(row[COLUMNS.MOQ]);

        if (outer !== firstOuter) outerMatch = false;
        if (units !== firstUnits) unitsMatch = false;
        if (moq !== firstMOQ) moqMatch = false;
      });

      const parts = key.split('x').map(Number);
      const volume = parts[0] * parts[1] * parts[2];

      result.push({
        key,
        innerDims: key,
        rows,
        volume,
        isInconsistent: !outerMatch || !unitsMatch || !moqMatch,
        discrepancies: {
          outer: !outerMatch,
          units: !unitsMatch,
          moq: !moqMatch
        }
      });
    });

    return result.sort((a, b) => (b.isInconsistent ? 1 : 0) - (a.isInconsistent ? 1 : 0));
  }, [data]);

  const filteredGroups = useMemo(() => {
    let result = groups;
    if (showOnlyInconsistent) {
      result = result.filter(g => 
        g.isInconsistent || 
        g.rows.some(({ row }) => rowStatuses[String(row[COLUMNS.ARTICLE_NO])] === 'pending')
      );
    }

    if (search || lineFilter.length > 0 || classFilter.length > 0) {
      const s = search.toLowerCase();
      result = result.filter(g => {
        const matchesSearch = !search || g.rows.some(({ row }) => 
          String(row[COLUMNS.ARTICLE_NO] || '').toLowerCase().includes(s) ||
          String(row[COLUMNS.ARTICLE_NAME] || '').toLowerCase().includes(s)
        );
        const matchesLine = lineFilter.length === 0 || g.rows.some(({ row }) => lineFilter.includes(String(row[COLUMNS.LINE] || '')));
        const matchesClass = classFilter.length === 0 || g.rows.some(({ row }) => classFilter.includes(String(row[COLUMNS.CLASSIFICATION] || '')));
        
        return matchesSearch && matchesLine && matchesClass;
      });
    }

    return result;
  }, [groups, showOnlyInconsistent, search, lineFilter, classFilter, rowStatuses]);

  const uniqueLines = useMemo(() => 
    Array.from(new Set(data.map(r => String(r[COLUMNS.LINE] || '')))).sort()
  , [data]);

  const uniqueClasses = useMemo(() => 
    Array.from(new Set(data.map(r => String(r[COLUMNS.CLASSIFICATION] || '')))).sort()
  , [data]);

  const nearDuplicateClusters = useMemo((): NearDuplicateCluster[] => {
    // Two groups are "similar" if every sorted dimension pair differs by < 1 cm absolute
    // (keys are already sorted ascending, e.g. "15x20x29")
    const MAX_DIFF_CM = 1;

    const maxAbsDiff = (keyA: string, keyB: string): number => {
      const a = keyA.split('x').map(Number);
      const b = keyB.split('x').map(Number);
      return Math.max(...a.map((v, i) => Math.abs(v - b[i])));
    };

    const validGroups = groups.filter(g => g.volume > 0);
    const assignedKeys = new Set<string>();
    const clusters: NearDuplicateCluster[] = [];

    for (let i = 0; i < validGroups.length; i++) {
      const a = validGroups[i];
      if (assignedKeys.has(a.key)) continue;

      const cluster: DimensionGroup[] = [a];
      assignedKeys.add(a.key);

      for (let j = i + 1; j < validGroups.length; j++) {
        const b = validGroups[j];
        if (assignedKeys.has(b.key)) continue;

        // b must be within 1 cm on every axis of every group already in the cluster
        const isSimilar = cluster.every(g => maxAbsDiff(g.key, b.key) < MAX_DIFF_CM);
        if (isSimilar) {
          cluster.push(b);
          assignedKeys.add(b.key);
        }
      }

      if (cluster.length >= 2) {
        const volumes = cluster.map(g => g.volume);
        // Max absolute diff (cm) across all pairs in the cluster
        let maxDiffPct = 0;
        for (let x = 0; x < cluster.length; x++) {
          for (let y = x + 1; y < cluster.length; y++) {
            maxDiffPct = Math.max(maxDiffPct, maxAbsDiff(cluster[x].key, cluster[y].key));
          }
        }
        clusters.push({ groups: cluster, volumes, maxDiffPct });
      }
    }

    return clusters;
  }, [groups]);

  const toggleGroup = (key: string) => {
    const next = new Set(expandedGroups);
    if (next.has(key)) {
      next.delete(key);
    } else {
      next.add(key);
    }
    setExpandedGroups(next);
  };

  const handleSyncField = async (group: DimensionGroup, sourceRow: ExcelRow, fieldType: 'outer' | 'units' | 'moq') => {
    setPendingAction({ group, sourceRow, fieldType });
  };

  const handleFullSync = async (group: DimensionGroup, sourceRow: ExcelRow) => {
    setPendingAction({ group, sourceRow, fieldType: 'all' });
  };

  const executeNearDupSync = async () => {
    if (!pendingNearDupSync) return;
    const { clusterKey, targetGroupKey, selectedIndices } = pendingNearDupSync;

    const cluster = nearDuplicateClusters.find(c => c.groups[0].key === clusterKey);
    if (!cluster) return;
    const targetGroup = cluster.groups.find(g => g.key === targetGroupKey);
    if (!targetGroup) return;

    const sourceRow = targetGroup.rows[0].row;
    const innerL = sourceRow[COLUMNS.INNER_L];
    const innerW = sourceRow[COLUMNS.INNER_W];
    const innerH = sourceRow[COLUMNS.INNER_H];

    onCaptureState(`Synced inner dimensions to ${targetGroupKey} cm for ${selectedIndices.length} products`);
    setPendingNearDupSync(null);

    for (const idx of selectedIndices) {
      const row = data[idx];
      const updatedRow = [...row];
      updatedRow[COLUMNS.INNER_L] = innerL;
      updatedRow[COLUMNS.INNER_W] = innerW;
      updatedRow[COLUMNS.INNER_H] = innerH;
      await onSaveRow(idx, updatedRow);
    }

    setClusterSelections(prev => {
      const next = { ...prev };
      delete next[pendingNearDupSync.clusterKey];
      return next;
    });
  };

  const executeSync = async () => {
    if (!pendingAction) return;
    const { group, sourceRow, fieldType } = pendingAction;
    const fieldLabel = fieldType === 'outer' ? 'Outer Box Dimensions' : fieldType === 'units' ? 'Units per Outer' : fieldType === 'moq' ? 'MOQ' : 'Full Packaging Data';

    onCaptureState(`Bulk synced ${fieldLabel} in group ${group.innerDims}`);
    setSyncing({ key: group.key, field: fieldType });
    setPendingAction(null);
    
    try {
      const outerL = sourceRow[COLUMNS.OUTER_L];
      const outerW = sourceRow[COLUMNS.OUTER_W];
      const outerH = sourceRow[COLUMNS.OUTER_H];
      const unitsOuter = sourceRow[COLUMNS.UNITS_OUTER];
      const moq = sourceRow[COLUMNS.MOQ];

      for (const { row, index } of group.rows) {
        if (row === sourceRow) continue;
        const updatedRow = [...row];
        
        if (fieldType === 'outer') {
          updatedRow[COLUMNS.OUTER_L] = outerL;
          updatedRow[COLUMNS.OUTER_W] = outerW;
          updatedRow[COLUMNS.OUTER_H] = outerH;
        } else if (fieldType === 'units') {
          updatedRow[COLUMNS.UNITS_OUTER] = unitsOuter;
        } else if (fieldType === 'moq') {
          updatedRow[COLUMNS.MOQ] = moq;
        } else if (fieldType === 'all') {
          updatedRow[COLUMNS.OUTER_L] = outerL;
          updatedRow[COLUMNS.OUTER_W] = outerW;
          updatedRow[COLUMNS.OUTER_H] = outerH;
          updatedRow[COLUMNS.UNITS_OUTER] = unitsOuter;
          updatedRow[COLUMNS.MOQ] = moq;
        }
        
        await onSaveRow(index, updatedRow);
      }
    } finally {
      setSyncing(null);
    }
  };

  return (
    <div className="space-y-6">
      <div className="flex flex-wrap items-center gap-4 bg-slate-800/50 p-4 rounded-lg border border-slate-700">
        <div className="relative flex-1 min-w-[250px]">
          <Search className="absolute left-3 top-1/2 -translate-y-1/2 w-4 h-4 text-slate-500" />
          <input
            type="text"
            placeholder="Search SKU or Name in groups..."
            value={search}
            onChange={e => setSearch(e.target.value)}
            className="w-full pl-9 pr-4 py-2 bg-slate-900 border border-slate-700 rounded-md text-sm text-white focus:outline-none focus:border-blue-500"
          />
        </div>

        <div className="flex items-center gap-2">
          <div className="relative">
            <button
              onClick={() => setOpenFilter(openFilter === 'line' ? null : 'line')}
              className={cn(
                "flex items-center gap-2 px-3 py-2 rounded-md border text-sm transition-colors",
                lineFilter.length > 0 ? "bg-blue-600/10 border-blue-500/50 text-blue-400" : "bg-slate-900 border-slate-700 text-slate-400 hover:border-slate-600"
              )}
            >
              <Filter className="w-4 h-4" />
              Line {lineFilter.length > 0 && `(${lineFilter.length})`}
            </button>
            {openFilter === 'line' && (
              <ColumnFilterPopover
                uniqueValues={uniqueLines}
                selectedValues={lineFilter}
                onToggle={val => setLineFilter(prev => prev.includes(val) ? prev.filter(v => v !== val) : [...prev, val])}
                onSelectAll={setLineFilter}
                onClear={() => setLineFilter([])}
                onClose={() => setOpenFilter(null)}
                title="Filter by Line"
                className="left-auto right-0"
              />
            )}
          </div>

          <div className="relative">
            <button
              onClick={() => setOpenFilter(openFilter === 'class' ? null : 'class')}
              className={cn(
                "flex items-center gap-2 px-3 py-2 rounded-md border text-sm transition-colors",
                classFilter.length > 0 ? "bg-blue-600/10 border-blue-500/50 text-blue-400" : "bg-slate-900 border-slate-700 text-slate-400 hover:border-slate-600"
              )}
            >
              <Filter className="w-4 h-4" />
              Class {classFilter.length > 0 && `(${classFilter.length})`}
            </button>
            {openFilter === 'class' && (
              <ColumnFilterPopover
                uniqueValues={uniqueClasses}
                selectedValues={classFilter}
                onToggle={val => setClassFilter(prev => prev.includes(val) ? prev.filter(v => v !== val) : [...prev, val])}
                onSelectAll={setClassFilter}
                onClear={() => setClassFilter([])}
                onClose={() => setOpenFilter(null)}
                title="Filter by Classification"
                className="left-auto right-0"
              />
            )}
          </div>

          {(lineFilter.length > 0 || classFilter.length > 0 || search) && (
            <button
              onClick={() => { setSearch(''); setLineFilter([]); setClassFilter([]); }}
              className="p-2 text-red-400 hover:text-red-300 transition-colors"
              title="Clear all filters"
            >
              <XIcon className="w-5 h-5" />
            </button>
          )}
        </div>

        <div className="h-8 w-px bg-slate-700 mx-2 hidden sm:block" />

        <div className="flex items-center gap-4 ml-auto">
          <label className="flex items-center gap-2 text-sm text-slate-300 cursor-pointer">
            <input 
              type="checkbox" 
              checked={showOnlyInconsistent} 
              onChange={e => setShowOnlyInconsistent(e.target.checked)}
              className="rounded border-slate-600 bg-slate-700 text-blue-600 focus:ring-blue-500"
            />
            Show only inconsistent
          </label>
          <div className="text-[10px] font-bold text-amber-500 bg-amber-500/10 px-2 py-1 rounded border border-amber-500/20 whitespace-nowrap">
            {groups.filter(g => g.isInconsistent).length} ISSUES
          </div>
        </div>
      </div>

      {nearDuplicateClusters.length > 0 && (
        <div className="space-y-2">
          <div className="flex items-center gap-2 px-1">
            <Link2 className="w-4 h-4 text-violet-400" />
            <span className="text-sm font-semibold text-violet-300">Possible data entry errors</span>
            <span className="text-xs text-slate-500 bg-slate-900 px-2 py-0.5 rounded-full border border-slate-700">
              {nearDuplicateClusters.length} cluster{nearDuplicateClusters.length !== 1 ? 's' : ''} with dimensions differing &lt;1 cm per axis
            </span>
          </div>
          {nearDuplicateClusters.map((cluster, ci) => {
            const allClusterRows = cluster.groups.flatMap(g => g.rows);
            const clusterKey = cluster.groups[0].key;
            const selection = clusterSelections[clusterKey] ?? new Set<number>();
            const targetKey = clusterSyncTargets[clusterKey] ?? cluster.groups[0].key;

            return (
              <div key={clusterKey} className="border border-violet-500/25 bg-violet-500/5 rounded-lg overflow-hidden">
                <button
                  onClick={() => {
                    const next = new Set(expandedNearDuplicates);
                    next.has(ci) ? next.delete(ci) : next.add(ci);
                    setExpandedNearDuplicates(next);
                  }}
                  className="w-full flex items-center gap-4 p-3 hover:bg-violet-500/10 transition-colors text-left"
                >
                  {expandedNearDuplicates.has(ci) ? <ChevronDown className="w-4 h-4 text-slate-500 shrink-0" /> : <ChevronRight className="w-4 h-4 text-slate-500 shrink-0" />}
                  <div className="flex items-center gap-3 flex-wrap flex-1">
                    {cluster.groups.map((g, gi) => (
                      <span key={g.key} className="font-mono text-xs text-violet-300 bg-violet-400/10 px-2 py-0.5 rounded">
                        {g.key} cm
                        <span className="text-slate-500 ml-1">({cluster.volumes[gi].toLocaleString()} cm³)</span>
                      </span>
                    ))}
                    <span className="text-xs text-violet-400/70">— max diff {cluster.maxDiffPct.toFixed(1)} cm</span>
                  </div>
                  <span className="text-xs text-slate-500 shrink-0">{allClusterRows.length} products</span>
                </button>

                {expandedNearDuplicates.has(ci) && (
                  <div className="border-t border-violet-500/20">
                    <div className="flex items-center gap-3 px-4 py-2.5 bg-violet-500/5 border-b border-violet-500/10 flex-wrap">
                      <span className="text-xs text-slate-400">Sync selected to:</span>
                      <select
                        value={targetKey}
                        onChange={e => setClusterSyncTargets(prev => ({ ...prev, [clusterKey]: e.target.value }))}
                        className="bg-slate-800 border border-slate-700 rounded px-2 py-1 text-xs text-white focus:outline-none focus:border-violet-500"
                      >
                        {cluster.groups.map(g => {
                          const repr = g.rows[0].row;
                          return (
                            <option key={g.key} value={g.key}>
                              {repr[COLUMNS.INNER_L]} × {repr[COLUMNS.INNER_W]} × {repr[COLUMNS.INNER_H]} cm
                            </option>
                          );
                        })}
                      </select>
                      <button
                        disabled={selection.size === 0}
                        onClick={() => setPendingNearDupSync({ clusterKey, targetGroupKey: targetKey, selectedIndices: Array.from(selection) })}
                        className="flex items-center gap-1.5 px-3 py-1 bg-violet-600/20 text-violet-400 hover:bg-violet-600 hover:text-white rounded text-xs font-medium transition-colors disabled:opacity-40 disabled:cursor-not-allowed"
                      >
                        <Layers className="w-3 h-3" />
                        Sync {selection.size} selected
                      </button>
                      <button
                        onClick={() => setClusterSelections(prev => ({ ...prev, [clusterKey]: new Set(allClusterRows.map(r => r.index)) }))}
                        className="text-xs text-slate-500 hover:text-slate-300 transition-colors"
                      >
                        Select all
                      </button>
                      {selection.size > 0 && (
                        <button
                          onClick={() => setClusterSelections(prev => ({ ...prev, [clusterKey]: new Set() }))}
                          className="text-xs text-slate-500 hover:text-slate-300 transition-colors"
                        >
                          Clear
                        </button>
                      )}
                    </div>

                    <div className="divide-y divide-violet-500/10">
                      {allClusterRows.map(({ row, index }) => {
                        const isSelected = selection.has(index);
                        return (
                          <div
                            key={index}
                            className={cn(
                              "flex items-center gap-3 px-4 py-2.5 hover:bg-violet-500/5 cursor-pointer transition-colors",
                              isSelected && "bg-violet-500/10"
                            )}
                            onClick={() => setClusterSelections(prev => {
                              const current = new Set(prev[clusterKey] ?? []);
                              if (current.has(index)) current.delete(index); else current.add(index);
                              return { ...prev, [clusterKey]: current };
                            })}
                          >
                            <input
                              type="checkbox"
                              checked={isSelected}
                              readOnly
                              className="rounded border-slate-600 bg-slate-700 text-violet-600 focus:ring-violet-500 shrink-0 pointer-events-none"
                            />
                            <div className="flex-1 min-w-0">
                              <div className="flex items-center gap-2">
                                <span className="font-mono text-xs text-slate-300 font-medium shrink-0">{row[COLUMNS.ARTICLE_NO]}</span>
                                <span className="text-xs text-slate-500 truncate">{row[COLUMNS.ARTICLE_NAME]}</span>
                              </div>
                            </div>
                            <span className="font-mono text-xs text-violet-300 bg-violet-400/10 px-2 py-0.5 rounded shrink-0">
                              {row[COLUMNS.INNER_L]} × {row[COLUMNS.INNER_W]} × {row[COLUMNS.INNER_H]} cm
                            </span>
                          </div>
                        );
                      })}
                    </div>
                  </div>
                )}
              </div>
            );
          })}
        </div>
      )}

      <div className="space-y-3">
        {filteredGroups.map(group => {
          const hasPending = group.rows.some(({ row }) => rowStatuses[String(row[COLUMNS.ARTICLE_NO])] === 'pending');
          return (
            <div key={group.key} className={cn(
              "border rounded-lg overflow-hidden transition-all",
              hasPending ? "border-yellow-500/50 bg-yellow-500/5 ring-1 ring-yellow-500/20" :
              group.isInconsistent ? "border-amber-500/30 bg-amber-500/5" : "border-slate-700 bg-slate-800/30"
            )}>
            <div className="flex items-center justify-between bg-slate-800/20 pr-4">
              <button 
                onClick={() => toggleGroup(group.key)}
                className="flex-1 flex items-center gap-4 p-4 hover:bg-slate-700/30 transition-colors text-left"
              >
                {expandedGroups.has(group.key) ? <ChevronDown className="w-5 h-5 text-slate-500" /> : <ChevronRight className="w-5 h-5 text-slate-500" />}
                <div>
                  <div className="flex items-center gap-2">
                    <span className="font-mono text-sm text-blue-400 bg-blue-400/10 px-2 py-0.5 rounded">
                      Inner: {group.innerDims} cm
                    </span>
                    {hasPending && (
                      <span className="flex items-center gap-1 text-xs font-medium text-yellow-500 bg-yellow-500/10 px-2 py-0.5 rounded ring-1 ring-yellow-500/20">
                        Pending Validation
                      </span>
                    )}
                    {group.isInconsistent ? (
                      <span className="flex items-center gap-1 text-xs font-medium text-amber-500 bg-amber-500/10 px-2 py-0.5 rounded ring-1 ring-amber-500/20">
                        <AlertTriangle className="w-3 h-3" />
                        Inconsistent
                      </span>
                    ) : !hasPending ? (
                      <span className="flex items-center gap-1 text-xs font-medium text-emerald-500 bg-emerald-500/10 px-2 py-0.5 rounded ring-1 ring-emerald-500/20">
                        <CheckCircle2 className="w-3 h-3" />
                        Consistent
                      </span>
                    ) : null}
                  </div>
                  <div className="text-xs text-slate-500 mt-1">
                    {group.rows.length} product{group.rows.length !== 1 ? 's' : ''} in this dimension group
                  </div>
                </div>
              </button>

              <div className="flex items-center gap-6">
                <div className="flex items-center gap-4 text-[10px] hidden md:flex">
                  {group.discrepancies.outer && (
                    <span className="text-amber-400 flex items-center gap-1">
                      <Package className="w-3 h-3" /> Outer Dims vary
                    </span>
                  )}
                  {group.discrepancies.units && (
                    <span className="text-amber-400 flex items-center gap-1">
                      <Boxes className="w-3 h-3" /> Units/Outer vary
                    </span>
                  )}
                  {group.discrepancies.moq && (
                    <span className="text-amber-400 flex items-center gap-1">
                      <Scale className="w-3 h-3" /> MOQ varies
                    </span>
                  )}
                </div>
                
                {group.isInconsistent && !expandedGroups.has(group.key) && (
                  <div className="text-[10px] font-bold text-blue-400 bg-blue-400/5 px-2 py-1 rounded border border-blue-400/20">
                    OPEN TO SYNC FIELDS
                  </div>
                )}
              </div>
            </div>

            {expandedGroups.has(group.key) && (
              <div className="border-t border-slate-700 overflow-x-auto">
                <table className="w-full text-xs text-left">
                  <thead className="bg-slate-900/50 text-slate-400 uppercase tracking-tight font-semibold">
                    <tr>
                      <th className="px-4 py-3">Article No / Name</th>
                      <th className="px-4 py-3">Inner Box (L/W/H)</th>
                      <th className={cn("px-4 py-3", group.discrepancies.outer && "text-amber-500")}>Outer Box (L/W/H)</th>
                      <th className={cn("px-4 py-3", group.discrepancies.units && "text-amber-500")}>Units/Outer</th>
                      <th className={cn("px-4 py-3", group.discrepancies.moq && "text-amber-500")}>MOQ</th>
                      <th className="px-4 py-3 text-right">Actions</th>
                    </tr>
                  </thead>
                  <tbody className="divide-y divide-slate-700/50">
                    {group.rows.map(({ row, index }) => {
                      const isPending = rowStatuses[String(row[COLUMNS.ARTICLE_NO])] === 'pending';
                      return (
                        <tr 
                          key={index} 
                          className={cn(
                            "hover:bg-slate-700/20 group transition-colors",
                            isPending ? "bg-yellow-400/20 border-l-4 border-l-yellow-400" : ""
                          )}
                        >
                        <td className="px-4 py-3">
                          <div className="font-medium text-slate-200">{row[COLUMNS.ARTICLE_NO]}</div>
                          <div className="text-[10px] text-slate-500 truncate max-w-[200px]">{row[COLUMNS.ARTICLE_NAME]}</div>
                        </td>
                        <td className="px-4 py-3 text-slate-400 font-mono">
                          {row[COLUMNS.INNER_L] || '-'} × {row[COLUMNS.INNER_W] || '-'} × {row[COLUMNS.INNER_H] || '-'}
                        </td>
                        <td className={cn(
                          "px-4 py-3 font-mono",
                          group.discrepancies.outer ? "text-amber-300" : "text-slate-400"
                        )}>
                          <div className="flex items-center gap-2 group/cell">
                            <button 
                              onClick={() => handleSyncField(group, row, 'outer')}
                              disabled={syncing?.key === group.key}
                              title="Apply these Outer Dims to all in group"
                              className="p-1 hover:bg-emerald-600/20 text-slate-600 hover:text-emerald-400 rounded opacity-0 group-hover:opacity-100 transition-opacity"
                            >
                               {syncing?.key === group.key && syncing?.field === 'outer' ? <Loader2 className="w-3 h-3 animate-spin" /> : <Layers className="w-3 h-3" />}
                            </button>
                            <span>{row[COLUMNS.OUTER_L] || '-'} × {row[COLUMNS.OUTER_W] || '-'} × {row[COLUMNS.OUTER_H] || '-'}</span>
                          </div>
                        </td>
                        <td className={cn(
                          "px-4 py-3",
                          group.discrepancies.units ? "text-amber-300 font-bold" : "text-slate-400"
                        )}>
                          <div className="flex items-center gap-2 group/cell">
                            <button 
                              onClick={() => handleSyncField(group, row, 'units')}
                              disabled={syncing?.key === group.key}
                              title="Apply this Units/Outer to all in group"
                              className="p-1 hover:bg-emerald-600/20 text-slate-600 hover:text-emerald-400 rounded opacity-0 group-hover:opacity-100 transition-opacity"
                            >
                               {syncing?.key === group.key && syncing?.field === 'units' ? <Loader2 className="w-3 h-3 animate-spin" /> : <Layers className="w-3 h-3" />}
                            </button>
                            <span>{row[COLUMNS.UNITS_OUTER] || '-'}</span>
                          </div>
                        </td>
                        <td className={cn(
                          "px-4 py-3",
                          group.discrepancies.moq ? "text-amber-300 font-bold" : "text-slate-400"
                        )}>
                          <div className="flex items-center gap-2 group/cell">
                            <button 
                              onClick={() => handleSyncField(group, row, 'moq')}
                              disabled={syncing?.key === group.key}
                              title="Apply this MOQ to all in group"
                              className="p-1 hover:bg-emerald-600/20 text-slate-600 hover:text-emerald-400 rounded opacity-0 group-hover:opacity-100 transition-opacity"
                            >
                               {syncing?.key === group.key && syncing?.field === 'moq' ? <Loader2 className="w-3 h-3 animate-spin" /> : <Layers className="w-3 h-3" />}
                            </button>
                            <span>{row[COLUMNS.MOQ] || '-'}</span>
                          </div>
                        </td>
                        <td className="px-4 py-3 text-right">
                          <div className="flex items-center justify-end gap-1">
                            <button 
                              onClick={() => handleFullSync(group, row)}
                              title="FULL SYNC: Apply ALL packaging measures labels to all in group"
                              disabled={syncing?.key === group.key}
                              className="p-1.5 hover:bg-blue-600/20 text-slate-500 hover:text-blue-400 rounded transition-all opacity-0 group-hover:opacity-100"
                            >
                              {syncing?.key === group.key && syncing?.field === 'all' ? <Loader2 className="w-4 h-4 animate-spin" /> : <RefreshCw className="w-4 h-4" />}
                            </button>
                            <button 
                              onClick={() => onRevertRow(String(row[COLUMNS.ARTICLE_NO]))}
                              title="Undo pending changes"
                              className="p-1.5 hover:bg-red-600/20 text-yellow-500 hover:text-red-400 rounded transition-all"
                            >
                              <Undo2 className="w-4 h-4" />
                            </button>
                            <button 
                              onClick={() => onEdit(index)}
                              title="Edit product"
                              className="p-1.5 hover:bg-slate-600/20 text-slate-500 hover:text-slate-300 rounded transition-all opacity-0 group-hover:opacity-100"
                            >
                              <Edit2 className="w-4 h-4" />
                            </button>
                          </div>
                        </td>
                      </tr>
                      );
                    })}
                  </tbody>
                </table>
              </div>
            )}
          </div>
        );
      })}

        {filteredGroups.length === 0 && (
          <div className="flex flex-col items-center justify-center py-20 bg-slate-800/20 border border-dashed border-slate-700 rounded-xl">
            <CheckCircle2 className="w-12 h-12 text-emerald-500/50 mb-3" />
            <h3 className="text-slate-300 font-medium">Clear of discrepancies</h3>
            <p className="text-slate-500 text-sm mt-1">
              {showOnlyInconsistent ? "No inconsistent groups found." : "No dimension data available."}
            </p>
          </div>
        )}
      </div>

      <ConfirmModal
        isOpen={!!pendingAction}
        onConfirm={executeSync}
        onCancel={() => setPendingAction(null)}
        title="Sync Group Data"
        message={`Are you sure you want to sync ${pendingAction?.fieldType === 'all' ? 'ALL packaging data' : pendingAction?.fieldType} for the whole group using product ${pendingAction?.sourceRow[COLUMNS.ARTICLE_NO]} as the template?`}
        type="warning"
        confirmText="Sync Group"
      />

      <ConfirmModal
        isOpen={!!pendingNearDupSync}
        onConfirm={executeNearDupSync}
        onCancel={() => setPendingNearDupSync(null)}
        title="Sync Inner Dimensions"
        message={`Update inner dimensions to ${pendingNearDupSync?.targetGroupKey} cm for ${pendingNearDupSync?.selectedIndices.length} selected product${(pendingNearDupSync?.selectedIndices.length ?? 0) !== 1 ? 's' : ''}?`}
        type="warning"
        confirmText="Sync Dimensions"
      />
    </div>
  );
}
