import React, { useRef, useState, useMemo } from 'react';
import { AppConfig, LayoutSplits, Partition } from '../types';
import { Grid, MousePointer2, Trash2, RotateCcw, X, Move, Settings2 } from 'lucide-react';

interface Props {
  config: AppConfig;
  splits: LayoutSplits;
  onChange: (splits: LayoutSplits) => void;
}

type EditMode = 'lines' | 'cells';
type Axis = 'x' | 'y';

type DragTarget = 
  | { type: 'main'; axis: Axis; index: number }
  | { type: 'partition'; cellKey: string; id: string; axis: Axis };

export const LayoutStep: React.FC<Props> = ({ config, splits, onChange }) => {
  const svgRef = useRef<SVGSVGElement>(null);
  
  // -- STATE --
  const [mode, setMode] = useState<EditMode>('lines');
  const [mousePos, setMousePos] = useState({ x: 0, y: 0 });
  const [dragging, setDragging] = useState<DragTarget | null>(null);
  const [isButtonHovered, setIsButtonHovered] = useState(false);

  const [phantomMainAxis, setPhantomMainAxis] = useState<Axis | null>(null);
  const [hoveredMainSplit, setHoveredMainSplit] = useState<{ axis: Axis; index: number } | null>(null);

  const [hoveredCell, setHoveredCell] = useState<{ i: number; j: number } | null>(null);
  const [hoveredPartition, setHoveredPartition] = useState<{ id: string; cellKey: string } | null>(null);
  const [phantomPartition, setPhantomPartition] = useState<{ axis: Axis; offset: number; min: number; max: number } | null>(null);
  const [selectedPartitionId, setSelectedPartitionId] = useState<string | null>(null);

  // -- DATA --
  const safeX = Array.isArray(splits?.x) ? splits.x : [];
  const safeY = Array.isArray(splits?.y) ? splits.y : [];
  const safePartitions = splits?.partitions || {};

  const drawerW = Math.max(1, config.drawer.width || 300);
  const drawerD = Math.max(1, config.drawer.depth || 400);
  const wallThick = config.wallThickness || 1.2;
  const aspectRatio = drawerD / drawerW;

  const viewBoxW = 1000;
  const viewBoxH = viewBoxW * aspectRatio;

  const sortedX = useMemo(() => [0, ...safeX, 1].sort((a, b) => a - b), [safeX]);
  const sortedY = useMemo(() => [0, ...safeY, 1].sort((a, b) => a - b), [safeY]);

  // -- LOGIC: Dynamic Neighbors Calculation --
  // Эта функция пересчитывает реальные границы стенки на лету
  const calculateDynamicLimits = (target: { axis: Axis, offset: number, min?: number, max?: number }, parts: Partition[]) => {
      let min = 0;
      let max = 1;
      // Используем сохраненные min/max только как "подсказку" где центр стенки
      const mid = ((target.min ?? 0) + (target.max ?? 1)) / 2;

      parts.forEach(p => {
          if (p.axis === target.axis) return; // Игнорируем параллельные

          // Границы соседки (статические, но для соседки они тоже могут быть динамическими - тут упрощение для производительности)
          // В идеале нужен рекурсивный солвер, но для 2D UI достаточно проверить попадание
          const pMin = p.min ?? 0;
          const pMax = p.max ?? 1;

          if (target.offset > pMin && target.offset < pMax) {
              if (p.offset < mid) min = Math.max(min, p.offset);
              else if (p.offset > mid) max = Math.min(max, p.offset);
          }
      });
      return { min, max };
  };

  // Поиск границ для НОВОЙ стенки (под курсором)
  const getHoveredBoundaries = (lx: number, ly: number, parts: Partition[]) => {
      return calculateDynamicLimits({ axis: 'x', offset: lx, min: ly, max: ly }, parts); // Hack: передаем ly как min/max чтобы найти соседей по Y для X-стенки?
      // Нет, для новой стенки логика чуть другая - мы ищем ближайшие стенки вокруг точки (lx, ly)
      
      let minX = 0, maxX = 1;
      let minY = 0, maxY = 1;

      parts.forEach(p => {
          // Вычисляем ДИНАМИЧЕСКИЕ границы для соседки, чтобы знать её реальную длину
          const { min: pMin, max: pMax } = calculateDynamicLimits(p, parts);

          if (p.axis === 'x') {
              if (ly >= pMin && ly <= pMax) {
                  if (p.offset < lx) minX = Math.max(minX, p.offset);
                  if (p.offset > lx) maxX = Math.min(maxX, p.offset);
              }
          } else {
              if (lx >= pMin && lx <= pMax) {
                  if (p.offset < ly) minY = Math.max(minY, p.offset);
                  if (p.offset > ly) maxY = Math.min(maxY, p.offset);
              }
          }
      });
      return { minX, maxX, minY, maxY };
  };

  // -- ACTIONS --
  const createPartition = (i: number, j: number, axis: Axis, offset: number, min: number, max: number) => {
    const key = `${i}-${j}`;
    const current = safePartitions[key] || [];
    const newPart: Partition = {
      id: Math.random().toString(36).substr(2, 9),
      axis, offset, min, max,
      height: config.drawer.height || 80, rounded: false
    };
    onChange({ ...splits, partitions: { ...safePartitions, [key]: [...current, newPart] } });
    setSelectedPartitionId(newPart.id);
  };

  const updatePartition = (key: string, id: string, updates: Partial<Partition>) => {
    const current = safePartitions[key] || [];
    const updated = current.map(p => p.id === id ? { ...p, ...updates } : p);
    onChange({ ...splits, partitions: { ...safePartitions, [key]: updated } });
  };

  const removePartition = (key: string, id: string) => {
    const current = safePartitions[key] || [];
    onChange({ ...splits, partitions: { ...safePartitions, [key]: current.filter(p => p.id !== id) } });
    if (selectedPartitionId === id) setSelectedPartitionId(null);
    setHoveredPartition(null);
  };

  const removeMainSplit = (axis: Axis, index: number) => {
    const newSplits = { ...splits, x: [...safeX], y: [...safeY] };
    newSplits[axis] = newSplits[axis].filter((_, i) => i !== index);
    onChange(newSplits);
    setHoveredMainSplit(null);
    setDragging(null);
  };

  const getSelectedPartition = () => {
    if (!selectedPartitionId) return null;
    for (const key in safePartitions) {
      const part = safePartitions[key].find(p => p.id === selectedPartitionId);
      if (part) return { key, part };
    }
    return null;
  };
  const selectedData = getSelectedPartition();

  // -- MOUSE --
  const handleMouseMove = (e: React.MouseEvent) => {
    if (!svgRef.current) return;
    const rect = svgRef.current.getBoundingClientRect();
    if (rect.width === 0) return;
    const nx = Math.max(0, Math.min(1, (e.clientX - rect.left) / rect.width));
    const ny = Math.max(0, Math.min(1, (e.clientY - rect.top) / rect.height));
    setMousePos({ x: nx, y: ny });

    if (dragging) {
      if (dragging.type === 'main') {
        const newSplits = { ...splits, x: [...safeX], y: [...safeY] };
        const val = dragging.axis === 'x' ? nx : ny;
        newSplits[dragging.axis][dragging.index] = val;
        onChange(newSplits);
      } else {
        const [iStr, jStr] = dragging.cellKey.split('-');
        const i = parseInt(iStr); const j = parseInt(jStr);
        const cellX1 = sortedX[i]; const cellX2 = sortedX[i+1];
        const cellY1 = sortedY[j]; const cellY2 = sortedY[j+1];
        
        let newOffset = 0;
        if (dragging.axis === 'x') newOffset = (nx - cellX1) / (cellX2 - cellX1);
        else newOffset = (ny - cellY1) / (cellY2 - cellY1);
        
        newOffset = Math.max(0.02, Math.min(0.98, newOffset));
        if (!isNaN(newOffset)) updatePartition(dragging.cellKey, dragging.id, { offset: newOffset });
      }
      return;
    }

    if (isButtonHovered) return;

    if (mode === 'lines') {
      setHoveredMainSplit(null);
      const SNAP = 0.015;
      if (nx > SNAP && nx < 1 - SNAP && ny > SNAP && ny < 1 - SNAP) {
        const closeToX = safeX.some(val => Math.abs(nx - val) < SNAP);
        const closeToY = safeY.some(val => Math.abs(ny - val) < SNAP);
        if (!closeToX && !closeToY) setPhantomMainAxis(Math.min(nx, 1-nx) < Math.min(ny, 1-ny) ? 'y' : 'x');
        else setPhantomMainAxis(null);
      }
    } else {
      setHoveredPartition(null);
      setPhantomPartition(null);
      setHoveredCell(null);

      let cellIdx = null;
      for (let i = 0; i < sortedX.length - 1; i++) {
        if (nx >= sortedX[i] && nx <= sortedX[i+1]) {
          for (let j = 0; j < sortedY.length - 1; j++) {
            if (ny >= sortedY[j] && ny <= sortedY[j+1]) {
              cellIdx = { i, j }; break;
            }
          }
        }
      }

      if (cellIdx) {
        setHoveredCell(cellIdx);
        const key = `${cellIdx.i}-${cellIdx.j}`;
        const parts = safePartitions[key] || [];
        
        const cx1 = sortedX[cellIdx.i]; const cx2 = sortedX[cellIdx.i+1];
        const cy1 = sortedY[cellIdx.j]; const cy2 = sortedY[cellIdx.j+1];
        const cw = cx2 - cx1; const ch = cy2 - cy1;
        const lx = (nx - cx1) / cw;
        const ly = (ny - cy1) / ch;

        let found = null;
        const SNAP = 0.05;
        for (const p of parts) {
          // Для проверки наведения тоже используем динамические границы, чтобы не кликать в пустоту
          const { min: pMin, max: pMax } = calculateDynamicLimits(p, parts);
          if (p.axis === 'x') {
            if (ly >= pMin && ly <= pMax && Math.abs(lx - p.offset) < SNAP * (aspectRatio > 1 ? 1 : aspectRatio)) found = p;
          } else {
            if (lx >= pMin && lx <= pMax && Math.abs(ly - p.offset) < SNAP * (aspectRatio < 1 ? 1 : 1/aspectRatio)) found = p;
          }
        }

        if (found) {
          setHoveredPartition({ id: found.id, cellKey: key });
        } else {
          const bounds = getHoveredBoundaries(lx, ly, parts);
          const distL = lx - bounds.minX; const distR = bounds.maxX - lx;
          const distT = ly - bounds.minY; const distB = bounds.maxY - ly;
          const minX = Math.min(distL, distR);
          const minY = Math.min(distT, distB);
          
          const axis = minX < minY ? 'y' : 'x';
          const width = bounds.maxX - bounds.minX;
          const height = bounds.maxY - bounds.minY;
          
          if ((axis === 'y' && height > 0.1) || (axis === 'x' && width > 0.1)) {
             const offset = axis === 'x' ? lx : ly;
             const min = axis === 'x' ? bounds.minY : bounds.minX;
             const max = axis === 'x' ? bounds.maxY : bounds.maxX;
             setPhantomPartition({ axis, offset, min, max });
          }
        }
      }
    }
  };

  const handleMouseDown = (e: React.MouseEvent) => {
    if (isButtonHovered) return;
    if (mode === 'lines') {
      if (hoveredMainSplit) {
        if (e.button === 0) setDragging({ type: 'main', ...hoveredMainSplit });
        else if (e.button === 2) removeMainSplit(hoveredMainSplit.axis, hoveredMainSplit.index);
      } else if (phantomMainAxis) {
        const val = phantomMainAxis === 'x' ? mousePos.x : mousePos.y;
        const newSplits = { ...splits, x: [...safeX], y: [...safeY] };
        newSplits[phantomMainAxis] = [...newSplits[phantomMainAxis], val];
        onChange(newSplits);
        setDragging({ type: 'main', axis: phantomMainAxis, index: newSplits[phantomMainAxis].length - 1 });
      }
    } else {
      if (hoveredPartition) {
        const key = hoveredPartition.cellKey;
        const parts = safePartitions[key] || [];
        const part = parts.find(p => p.id === hoveredPartition.id);
        if (part) {
          if (e.button === 0) {
            setDragging({ type: 'partition', cellKey: key, id: part.id, axis: part.axis });
            setSelectedPartitionId(part.id);
          } else if (e.button === 2) {
            removePartition(key, part.id);
          }
        }
      } else if (hoveredCell && phantomPartition) {
        if (e.button === 0) {
          createPartition(hoveredCell.i, hoveredCell.j, phantomPartition.axis, phantomPartition.offset, phantomPartition.min, phantomPartition.max);
        }
      } else {
        setSelectedPartitionId(null);
      }
    }
  };

  const renderCellsAndPartitions = () => {
    const elements = [];
    for (let i = 0; i < sortedX.length - 1; i++) {
      for (let j = 0; j < sortedY.length - 1; j++) {
        const x1 = sortedX[i]; const x2 = sortedX[i + 1];
        const y1 = sortedY[j]; const y2 = sortedY[j + 1];
        if (y2 === undefined || x2 === undefined) continue;

        const cellX = x1 * viewBoxW; const cellY = y1 * viewBoxH;
        const cellW = (x2 - x1) * viewBoxW; const cellH = (y2 - y1) * viewBoxH;
        const key = `${i}-${j}`;
        
        const isHovered = hoveredCell?.i === i && hoveredCell?.j === j && mode === 'cells';
        const parts = safePartitions[key] || [];
        const isAnySelected = parts.some(p => p.id === selectedPartitionId);
        const realW = (x2 - x1) * drawerW;
        const realD = (y2 - y1) * drawerD;

        if (parts.length === 0) {
            const labelX = cellX + cellW / 2;
            const labelY = cellY + cellH / 2;
            const textW = Math.max(0, realW - wallThick).toFixed(0);
            const textD = Math.max(0, realD - wallThick).toFixed(0);
            if (cellH > 40 && cellW > 60) {
                elements.push(
                    <text key={`label-${key}`} x={labelX} y={labelY} textAnchor="middle" dominantBaseline="middle" className="fill-slate-300 font-mono text-[16px] font-bold pointer-events-none select-none opacity-80" style={{ textShadow: '1px 1px 2px rgba(0,0,0,0.8)' }}>
                        {textW} × {textD}
                    </text>
                );
            }
        }

        elements.push(
          <g key={key}>
            {isHovered && <rect x={cellX} y={cellY} width={cellW} height={cellH} fill="rgba(16, 185, 129, 0.05)" stroke="#10b981" strokeWidth="2" strokeDasharray="4,4" className="pointer-events-none"/>}
            
            {parts.map(p => {
              // ИСПОЛЬЗУЕМ ДИНАМИЧЕСКИЙ РАСЧЕТ ГРАНИЦ ДЛЯ ОТРИСОВКИ
              const { min: pMin, max: pMax } = calculateDynamicLimits(p, parts);
              
              let lx1, ly1, lx2, ly2;
              let dist1 = 0, dist2 = 0;
              let midX, midY;

              const isVertical = p.axis === 'x';

              if (isVertical) {
                const px = cellX + (cellW * p.offset);
                lx1 = px; lx2 = px;
                ly1 = cellY + (cellH * pMin); ly2 = cellY + (cellH * pMax);
                
                // Для X-стенки, p.offset - это X координата. 
                // pMin/pMax - это границы по Y.
                // Чтобы найти расстояние по бокам, нам нужны границы по X.
                // Мы ищем ВЕРТИКАЛЬНЫХ соседей в диапазоне Y [pMin, pMax]
                // calculateDynamicLimits дает границы ВДОЛЬ самой стенки. Это нам дало высоту.
                
                // Теперь найдем ширину (слева/справа).
                // Мы берем точку в центре стенки и ищем ближайших вертикальных соседей
                const { min: leftLim, max: rightLim } = calculateDynamicLimits({ axis: 'y', offset: (pMin + pMax)/2, min: 0, max: 1 }, parts.filter(pp => pp.axis === 'x'));
                // Это хак. Правильнее:
                let left = 0, right = 1;
                const cy = (pMin + pMax)/2;
                parts.forEach(n => {
                    if (n.axis === 'x') {
                        // Соседка перекрывает нас по высоте?
                        // Нужно найти её реальные границы
                        const { min: nMin, max: nMax } = calculateDynamicLimits(n, parts);
                        if (cy > nMin && cy < nMax) {
                            if (n.offset < p.offset) left = Math.max(left, n.offset);
                            if (n.offset > p.offset) right = Math.min(right, n.offset);
                        }
                    }
                });

                dist1 = (p.offset - left) * realW - wallThick;
                dist2 = (right - p.offset) * realW - wallThick;
                
                midX = px; 
                midY = (ly1 + ly2) / 2;

              } else {
                const py = cellY + (cellH * p.offset);
                ly1 = py; ly2 = py;
                lx1 = cellX + (cellW * pMin); lx2 = cellX + (cellW * pMax);
                
                let top = 0, bot = 1;
                const cx = (pMin + pMax)/2;
                parts.forEach(n => {
                    if (n.axis === 'y') {
                        const { min: nMin, max: nMax } = calculateDynamicLimits(n, parts);
                        if (cx > nMin && cx < nMax) {
                            if (n.offset < p.offset) top = Math.max(top, n.offset);
                            if (n.offset > p.offset) bot = Math.min(bot, n.offset);
                        }
                    }
                });

                dist1 = (p.offset - top) * realD - wallThick;
                dist2 = (bot - p.offset) * realD - wallThick;
                
                midX = (lx1 + lx2) / 2; 
                midY = py;
              }
              
              const isSel = selectedPartitionId === p.id;
              const isHov = hoveredPartition?.id === p.id;
              const textOffset = 10;
              
              return (
                <g key={p.id}>
                    <g onDoubleClick={(e) => { e.stopPropagation(); removePartition(key, p.id); }}>
                        <line x1={lx1} y1={ly1} x2={lx2} y2={ly2} stroke="transparent" strokeWidth="40" />
                        <line x1={lx1} y1={ly1} x2={lx2} y2={ly2} stroke={isSel ? "#a855f7" : (isHov ? "#d8b4fe" : "#7e22ce")} strokeWidth={isSel ? 6 : 4} strokeLinecap="round" />
                    </g>
                    
                    <g className="pointer-events-none select-none font-mono text-[14px] font-bold fill-white" style={{ textShadow: '0px 0px 3px #000' }}>
                        {isVertical ? (
                            <>
                                <text x={midX - textOffset} y={midY} textAnchor="end" dominantBaseline="middle">{Math.max(0, dist1).toFixed(0)}</text>
                                <text x={midX + textOffset} y={midY} textAnchor="start" dominantBaseline="middle">{Math.max(0, dist2).toFixed(0)}</text>
                            </>
                        ) : (
                            <>
                                <text x={midX} y={midY - textOffset} textAnchor="middle" dominantBaseline="auto">{Math.max(0, dist1).toFixed(0)}</text>
                                <text x={midX} y={midY + textOffset * 2} textAnchor="middle" dominantBaseline="auto">{Math.max(0, dist2).toFixed(0)}</text>
                            </>
                        )}
                    </g>
                </g>
              );
            })}

            {isHovered && phantomPartition && !hoveredPartition && !dragging && (
              <g className="pointer-events-none opacity-60">
                {(() => {
                    const { min: pMin, max: pMax } = phantomPartition;
                    let fx1, fy1, fx2, fy2;
                    if (phantomPartition.axis === 'x') {
                        const px = cellX + (cellW * phantomPartition.offset);
                        fx1 = px; fx2 = px; fy1 = cellY + (cellH * pMin); fy2 = cellY + (cellH * pMax);
                    } else {
                        const py = cellY + (cellH * phantomPartition.offset);
                        fy1 = py; fy2 = py; fx1 = cellX + (cellW * pMin); fx2 = cellX + (cellW * pMax);
                    }
                    return <line x1={fx1} y1={fy1} x2={fx2} y2={fy2} stroke="#34d399" strokeWidth="3" strokeDasharray="6,6"/>;
                })()}
              </g>
            )}
          </g>
        );
      }
    }
    return elements;
  };

  return (
    <div className="bg-slate-900 p-4 rounded-xl shadow-lg border border-slate-800 h-full flex flex-col relative overflow-hidden">
      <div className="flex justify-between items-center mb-2 z-20 shrink-0">
        <h2 className="text-lg font-bold flex items-center gap-2 text-primary"><Grid size={20} /> 2. Редактор макета</h2>
        <div className="flex bg-slate-800 p-1 rounded-lg border border-slate-700">
            <button onClick={() => { setMode('lines'); setSelectedPartitionId(null); }} className={`flex items-center gap-2 px-3 py-1.5 rounded-md text-xs font-bold transition-all ${mode === 'lines' ? 'bg-primary text-white shadow' : 'text-gray-400 hover:text-gray-200'}`}><Move size={14}/> Границы</button>
            <button onClick={() => setMode('cells')} className={`flex items-center gap-2 px-3 py-1.5 rounded-md text-xs font-bold transition-all ${mode === 'cells' ? 'bg-primary text-white shadow' : 'text-gray-400 hover:text-gray-200'}`}><Grid size={14}/> Внутри ячеек</button>
        </div>
        <button onClick={() => onChange({ x: [], y: [], partitions: {} })} className="px-3 py-1.5 text-xs text-red-400 border border-slate-700 rounded hover:bg-slate-800 transition-colors flex items-center gap-1"><RotateCcw size={14} /> Сброс</button>
      </div>

      <div className="bg-slate-800/50 rounded-lg px-3 py-2 mb-2 flex items-center gap-3 text-[11px] text-gray-300 border border-slate-700/50 shrink-0">
          <MousePointer2 size={14} className="text-primary" />
          {mode === 'lines' ? (
              <div className="flex gap-3"><span><b className="text-blue-400">ЛКМ:</b> Линия</span><span><b className="text-red-400">ПКМ:</b> Удалить</span></div>
          ) : (
              <div className="flex gap-3"><span><b className="text-green-400">ЛКМ в ячейке:</b> Стенка</span><span><b className="text-purple-400">Драг:</b> Двигать</span><span><b className="text-red-400">2xЛКМ:</b> Удалить</span></div>
          )}
      </div>

      <div className="flex-1 bg-slate-800/30 rounded-lg flex flex-col items-center justify-center relative overflow-hidden border border-slate-700/50 min-h-0 w-full">
            <div className="relative w-full h-full flex items-center justify-center p-4">
                <div className="relative shadow-2xl bg-[#1e293b] border border-slate-600 rounded-sm overflow-hidden" style={{ width: aspectRatio > 1 ? 'auto' : '100%', height: aspectRatio > 1 ? '100%' : 'auto', aspectRatio: `${1/aspectRatio}`, maxHeight: '100%', maxWidth: '100%', cursor: mode === 'lines' ? (dragging ? 'grabbing' : hoveredMainSplit ? 'col-resize' : 'crosshair') : (dragging ? 'grabbing' : hoveredPartition ? 'grab' : hoveredCell ? 'crosshair' : 'default') }}>   
                   <svg ref={svgRef} viewBox={`0 0 ${viewBoxW} ${viewBoxH}`} className="w-full h-full touch-none block" onMouseMove={handleMouseMove} onMouseDown={handleMouseDown} onMouseUp={() => setDragging(null)} onMouseLeave={() => setDragging(null)} onContextMenu={(e) => e.preventDefault()}>
                      <defs><pattern id="grid" width="50" height="50" patternUnits="userSpaceOnUse"><path d="M 50 0 L 0 0 0 50" fill="none" stroke="rgba(255,255,255,0.03)" strokeWidth="1"/></pattern></defs>
                      <rect width="100%" height="100%" fill="url(#grid)" />
                      {renderCellsAndPartitions()}
                      {safeX.map((x, i) => (
                        <g key={`x-${i}`} onMouseMove={(e) => { if(mode === 'lines' && !dragging) { e.stopPropagation(); setHoveredMainSplit({axis: 'x', index: i}); setPhantomMainAxis(null); }}} onDoubleClick={(e) => { e.stopPropagation(); removeMainSplit('x', i); }}>
                            <line x1={x * viewBoxW} y1="0" x2={x * viewBoxW} y2="100%" stroke="transparent" strokeWidth="40" className={mode === 'lines' ? "cursor-col-resize" : ""} />
                            <line x1={x * viewBoxW} y1="0" x2={x * viewBoxW} y2="100%" stroke={hoveredMainSplit?.axis === 'x' && hoveredMainSplit.index === i ? "#f59e0b" : "#64748b"} strokeWidth={hoveredMainSplit?.axis === 'x' && hoveredMainSplit.index === i ? 6 : 4} className="pointer-events-none" />
                        </g>
                      ))}
                      {safeY.map((y, i) => (
                        <g key={`y-${i}`} onMouseMove={(e) => { if(mode === 'lines' && !dragging) { e.stopPropagation(); setHoveredMainSplit({axis: 'y', index: i}); setPhantomMainAxis(null); }}} onDoubleClick={(e) => { e.stopPropagation(); removeMainSplit('y', i); }}>
                            <line x1="0" y1={y * viewBoxH} x2="100%" y2={y * viewBoxH} stroke="transparent" strokeWidth="40" className={mode === 'lines' ? "cursor-row-resize" : ""} />
                            <line x1="0" y1={y * viewBoxH} x2="100%" y2={y * viewBoxH} stroke={hoveredMainSplit?.axis === 'y' && hoveredMainSplit.index === i ? "#f59e0b" : "#64748b"} strokeWidth={hoveredMainSplit?.axis === 'y' && hoveredMainSplit.index === i ? 6 : 4} className="pointer-events-none" />
                        </g>
                      ))}
                      {mode === 'lines' && !hoveredMainSplit && !dragging && phantomMainAxis && (
                        <line x1={phantomMainAxis === 'x' ? mousePos.x * viewBoxW : 0} y1={phantomMainAxis === 'y' ? mousePos.y * viewBoxH : 0} x2={phantomMainAxis === 'x' ? mousePos.x * viewBoxW : '100%'} y2={phantomMainAxis === 'y' ? mousePos.y * viewBoxH : '100%'} stroke="#3b82f6" strokeWidth="4" strokeDasharray="8,8" className="pointer-events-none opacity-50"/>
                      )}
                   </svg>
                </div>
            </div>

            {mode === 'cells' && selectedData && (
                <div className="absolute top-0 right-0 bottom-0 w-72 bg-slate-900 border-l border-slate-700 p-4 shadow-2xl flex flex-col z-30 animate-in slide-in-from-right duration-200">
                    <div className="flex justify-between items-center mb-6"><h3 className="text-sm font-bold text-white flex items-center gap-2">Настройки стенки</h3><button onClick={() => setSelectedPartitionId(null)} className="text-gray-400 hover:text-white"><X size={20}/></button></div>
                    <div className="bg-slate-800 p-4 rounded border border-slate-700 space-y-6">
                        <div><div className="flex justify-between text-xs text-gray-300 mb-2"><span>Высота</span> <span className="font-mono bg-slate-900 px-1.5 py-0.5 rounded text-xs">{selectedData.part.height} мм</span></div><input type="range" min="5" max={config.drawer.height || 100} step="1" value={selectedData.part.height} onChange={(e) => updatePartition(selectedData.key, selectedData.part.id, { height: parseFloat(e.target.value) })} className="w-full h-1 bg-slate-600 rounded-lg appearance-none cursor-pointer accent-purple-500"/></div>
                        <div className="flex items-center justify-between"><label htmlFor="rounded-check" className="text-xs text-gray-300 cursor-pointer select-none">Скруглить края</label><input type="checkbox" id="rounded-check" checked={selectedData.part.rounded} onChange={(e) => updatePartition(selectedData.key, selectedData.part.id, { rounded: e.target.checked })} className="w-4 h-4 rounded bg-slate-700 border-slate-600 text-purple-500 focus:ring-0 cursor-pointer"/></div>
                        <button onClick={() => removePartition(selectedData.key, selectedData.part.id)} className="w-full py-2 bg-red-500/10 hover:bg-red-500/20 text-red-400 border border-red-500/30 rounded text-xs flex items-center justify-center gap-2 transition-colors mt-4"><Trash2 size={14}/> Удалить</button>
                    </div>
                </div>
            )}
        </div>
    </div>
  );
};