import { useState, useEffect, useMemo } from 'react';
import { format, differenceInMinutes, parseISO } from 'date-fns';
import { CheckCircle2, Circle, Clock, MapPin, AlertCircle, Zap, Navigation, Edit2, Trash2, Plus, List, X, Calendar as CalendarIcon, AlignLeft, MessageSquare, FileText, Flag, ChevronDown } from 'lucide-react';
import { useTourStore } from '@/store/useTourStore';
import { useConfirm } from '@/hooks/useConfirm';
import { useNotification } from '@/hooks/useNotification';
import { CommentModal } from '@/components/CommentModal';

const TimeVariance = ({ planned, actual }: { planned: string, actual: string | null }) => {
  if (!actual) return null;
  
  const diff = differenceInMinutes(parseISO(actual), parseISO(planned));
  const isLate = diff > 0;
  
  return (
    <div className={`flex items-center text-xs font-medium mt-1 ${isLate ? 'text-red-500' : 'text-green-600'}`}>
      {isLate ? <AlertCircle className="w-3 h-3 mr-1" /> : <CheckCircle2 className="w-3 h-3 mr-1" />}
      <span>
        {isLate ? `Trễ ${diff} phút` : diff === 0 ? 'Đúng giờ' : `Sớm ${Math.abs(diff)} phút`}
      </span>
    </div>
  );
};

const calculateDistance = (lat1: number, lon1: number, lat2: number, lon2: number) => {
  const p = 0.017453292519943295; // Math.PI / 180
  const c = Math.cos;
  const a = 0.5 - c((lat2 - lat1) * p) / 2 + 
            c(lat1 * p) * c(lat2 * p) * 
            (1 - c((lon2 - lon1) * p)) / 2;
  return 12742 * Math.asin(Math.sqrt(a)); // 2 * R; R = 6371 km
};

const formatTravelTime = (minutes: number) => {
  if (minutes < 60) return `${minutes} phút`;
  const hours = Math.floor(minutes / 60);
  const mins = minutes % 60;
  return mins > 0 ? `${hours} giờ ${mins} phút` : `${hours} giờ`;
};

export const ItineraryTimeline = ({
  onAddLocation, 
  onEditLocation,
  onQuickNote,
  onNavigate,
  onSuccess,
  isPublicView = false
}: { 
  onAddLocation?: (legId: string, isStart?: boolean, isEnd?: boolean) => void, 
  onEditLocation?: (location: any) => void, 
  onQuickNote?: (data: { legId: string; location: any; leg: any }) => void,
  onNavigate?: (location: any) => void,
  onSuccess?: () => void,
  isPublicView?: boolean 
}) => {
  // Tối ưu hóa selectors để chỉ lắng nghe những thay đổi cần thiết
  const currentTour = useTourStore(state => state.currentTour);
  const legs = useTourStore(state => state.legs);
  const userRole = useTourStore(state => state.userRole);
  const addLeg = useTourStore(state => state.addLeg);
  const updateLeg = useTourStore(state => state.updateLeg);
  // Removed: const { isPublicView } = useTourStore(state => state); // isPublicView is passed as a prop
  const deleteLeg = useTourStore(state => state.deleteLeg);
  const initializeLegs = useTourStore(state => state.initializeLegs);
  const deleteLocation = useTourStore(state => state.deleteLocation);

  // Khai báo logic canEdit để sử dụng trong toàn bộ component
  const canEdit = isPublicView ? false : ['OWNER', 'MANAGER'].includes(userRole || '');

  const confirm = useConfirm();
  const notify = useNotification();
  const [isLegCountModalOpen, setIsLegCountModalOpen] = useState(false);
  const [tempLegCount, setTempLegCount] = useState(3);
  const [isCommentModalOpen, setIsCommentModalOpen] = useState(false);
  const [commentLocationId, setCommentLocationId] = useState('');
  const [commentLocationName, setCommentLocationName] = useState('');
  
  // State to track single expanded stage (exclusive single-expansion mode)
  const [expandedStageId, setExpandedStageId] = useState<string | null>(legs.length > 0 ? legs[0]?.id : null);

  const toggleStageExpanded = (legId: string) => {
    // Exclusive mode: if clicking the same stage, close it. Otherwise, open only the clicked one.
    setExpandedStageId(prevId => prevId === legId ? null : legId);
  };

  // Tối ưu hóa: Cập nhật UI ngay lập tức bằng cách can thiệp vào State của Store
  const handleCommentIncrement = (locationId: string) => {
    const currentLegs = useTourStore.getState().legs;
    const updatedLegs = currentLegs.map((leg: any) => ({
      ...leg,
      locations: leg.locations.map((loc: any) => 
        loc.id === locationId 
          ? { ...loc, _count: { ...loc._count, comments: (loc._count?.comments || 0) + 1 } }
          : loc
      )
    }));
    // Dùng setState của Zustand để cập nhật một phần dữ liệu
    useTourStore.setState({ legs: updatedLegs });
  };

  const handleCommentDecrement = (locationId: string) => {
    const currentLegs = useTourStore.getState().legs;
    const updatedLegs = currentLegs.map((leg: any) => ({
      ...leg,
      locations: leg.locations.map((loc: any) => 
        loc.id === locationId 
          ? { ...loc, _count: { ...loc._count, comments: Math.max(0, (loc._count?.comments || 1) - 1) } }
          : loc
      )
    }));
    useTourStore.setState({ legs: updatedLegs });
  };

  // State cho Modal sửa chặng
  const [isEditModalOpen, setIsEditModalOpen] = useState(false);
  const [editingLegData, setEditingLegData] = useState({ 
    id: '', 
    note: '', 
    description: '', 
    startDate: '', 
    endDate: '' 
  });

  const handleStatusClick = (location: any) => {
    if (onNavigate) {
      onNavigate(location);
    }
  };

  const handleAddLeg = async () => {
    const note = window.prompt("Nhập ghi chú cho chặng mới:", `Chặng ${legs.length + 1}`);
    if (note && currentTour) {
      await addLeg(currentTour.id, { note });
    }
  };

  const handleDeclareLegs = async () => {
    setTempLegCount(legs.length > 0 ? legs.length : 3);
    setIsLegCountModalOpen(true);
  };

  const confirmDeclareLegs = async () => {
    if (tempLegCount > 0 && tempLegCount <= 20 && currentTour) {
      await initializeLegs(currentTour.id, tempLegCount);
    }
    setIsLegCountModalOpen(false);
  };

  const handleEditLeg = async (leg: any) => {
    setEditingLegData({ 
      id: leg.id, 
      note: leg.note || "",
      description: leg.description || "",
      startDate: leg.startDate ? leg.startDate.split('T')[0] : "",
      endDate: leg.endDate ? leg.endDate.split('T')[0] : ""
    });
    setIsEditModalOpen(true);
  };

  const saveLegEdit = async () => {
    if (editingLegData.id) {
      await updateLeg(editingLegData.id, { 
        note: editingLegData.note,
        description: editingLegData.description,
        startDate: editingLegData.startDate || null,
        endDate: editingLegData.endDate || null
      });
      setIsEditModalOpen(false);
    }
  };

  const handleDeleteLeg = async (legId: string) => {
    const isConfirmed = await confirm({
      title: 'Xóa chặng',
      message: 'Bạn có chắc chắn muốn xóa chặng này?'
    });
    if (isConfirmed) {
      try {
        await deleteLeg(legId);
        onSuccess?.();
      } catch (err: any) {
        notify({ title: 'Lỗi', message: err.message, type: 'error' });
      }
    }
  };

  const handleDeleteLocation = async (id: string) => {
    const isConfirmed = await confirm({
      title: 'Xóa địa điểm',
      message: 'Bạn có chắc chắn muốn xóa địa điểm này?'
    });
    if (isConfirmed) {
      try {
        await deleteLocation(id);
        onSuccess?.();
      } catch (err: any) {
        notify({ title: 'Lỗi', message: err.message, type: 'error' });
      }
    }
  };

  // Tạo mảng phẳng tất cả địa điểm để tính toán quãng đường liên tục giữa các chặng
  const allLocations = useMemo(() => legs.flatMap(l => l.locations), [legs]);

  useEffect(() => {
    console.log("ItineraryTimeline: Legs updated", legs);
    // Initialize first leg as expanded when legs change
    if (legs.length > 0 && !expandedStageId) {
      setExpandedStageId(legs[0].id);
    }
  }, [legs]);

  return (
    <div id="itinerary-timeline-print-zone" className="timeline-scroll-container itinerary-timeline-container">
        {legs.length === 0 ? (
          <div className="text-center py-20 bg-white rounded-3xl border-2 border-dashed border-gray-200">
             <List className="w-12 h-12 text-gray-300 mx-auto mb-4" />
             <p className="text-gray-500 font-medium">Chưa có chặng nào trong lộ trình.</p>
          </div>
        ) : (
          legs.map((leg, legIdx) => {
              const totalDwellMinutes = leg.locations.reduce((acc: number, loc: any) => {
                if (loc.plannedStart && loc.plannedEnd) {
                  return acc + differenceInMinutes(parseISO(loc.plannedEnd), parseISO(loc.plannedStart));
                }
                return acc;
              }, 0);

              // Xác định địa điểm cuối cùng của chặng trước đó để hiển thị tính liên tục
              const prevLegLastLoc = legIdx > 0 ? legs[legIdx - 1]?.locations.slice(-1)[0] : null;

              return (
                <section key={leg.id} className={`folder-node-wrapper ${expandedStageId === leg.id ? 'expanded' : 'collapsed'}`}>
                  {/* Folder header row - clickable to toggle exclusive expansion */}
                  <div 
                    onClick={() => toggleStageExpanded(leg.id)}
                    className="folder-header-row animate-in fade-in slide-in-from-bottom-4 duration-300 hover:bg-gray-50/50 transition-colors"
                  >
                    <div className="font-black text-blue-600 text-xl truncate flex-1 flex flex-col gap-1">
                      <div className="flex items-center gap-2">
                        <span className="bg-blue-600 text-white w-8 h-8 rounded-lg flex items-center justify-center text-sm shrink-0">
                          {leg.sequence}
                        </span>
                        <div className="flex flex-col overflow-hidden">
                          <span className="truncate leading-tight">{leg.note || `Chi tiết Chặng ${leg.sequence}`}</span>
                          {leg.startDate && (
                            <span className="text-[10px] text-gray-400 font-black uppercase tracking-wider flex items-center gap-1 mt-0.5">
                              <CalendarIcon className="w-2.5 h-2.5" />
                              {format(parseISO(leg.startDate), 'dd/MM/yyyy')}
                              {leg.endDate && leg.endDate !== leg.startDate && ` - ${format(parseISO(leg.endDate), 'dd/MM/yyyy')}`}
                            </span>
                          )}
                        </div>
                      </div>
                      {prevLegLastLoc && (
                        <div className="flex items-center gap-1 text-[10px] text-gray-400 uppercase tracking-widest ml-10">
                          <Navigation className="w-2.5 h-2.5 rotate-90" /> Tiếp nối từ {prevLegLastLoc.name}
                        </div>
                      )}
                    </div>
                    {/* Expand/Collapse indicator button */}
                    <button
                      onClick={(e) => { e.stopPropagation(); toggleStageExpanded(leg.id); }}
                      className="ml-2 p-2 text-gray-400 hover:text-blue-600 hover:bg-blue-50 rounded-xl transition-all shrink-0"
                      title={expandedStageId === leg.id ? 'Collapse chặng này' : 'Expand chặng này'}
                    >
                      <ChevronDown 
                        className={`w-5 h-5 transition-transform duration-300 ${
                          expandedStageId === leg.id ? 'rotate-180' : ''
                        }`}
                      />
                    </button>
                  </div>

                  {/* Action Buttons Row - Below stage title */}
                  <div className="px-4 py-2 bg-white border-b border-gray-100 flex items-center gap-2 flex-wrap">
                    {canEdit && (
                      <>
                        <button 
                          onClick={(e) => { e.stopPropagation(); onAddLocation?.(leg.id, legIdx === 0 && leg.locations.length === 0); }}
                          className="p-2 bg-gray-50 text-gray-600 hover:text-blue-600 hover:bg-blue-100 rounded-xl transition-all border border-gray-200"
                          title="Thêm địa điểm vào chặng này"
                        >
                          <Plus className="w-4 h-4" />
                        </button>
                        <button 
                          onClick={(e) => { e.stopPropagation(); handleEditLeg(leg); }}
                          className="p-2 bg-gray-50 text-gray-600 hover:text-blue-600 hover:bg-blue-100 rounded-xl transition-all border border-gray-200"
                        >
                          <Edit2 className="w-4 h-4" />
                        </button>
                        <button 
                          onClick={(e) => { e.stopPropagation(); handleDeleteLeg(leg.id); }}
                          className="p-2 bg-gray-50 text-red-600 hover:text-white-600 hover:bg-red-100 rounded-xl transition-all border border-gray-200"
                        >
                          <Trash2 className="w-4 h-4" />
                        </button>
                      </>
                    )}
                    {leg.totalDistance !== undefined && (
                      <div className="flex items-center gap-2">
                        <div className="text-xs font-bold text-blue-600 bg-blue-50 px-2 py-1 rounded-lg border border-blue-100">
                          {leg.totalDistance} km
                        </div>
                        <div className="text-xs font-bold text-gray-500 bg-gray-50 px-2 py-1 rounded-lg border border-gray-100 flex items-center gap-1">
                          <Clock className="w-3 h-3" />
                          ~ {formatTravelTime(Math.round((leg.totalDistance / 35) * 60))}
                        </div>
                      </div>
                    )}
                    {totalDwellMinutes > 0 && (
                      <div className="text-xs font-bold text-amber-600 bg-amber-50 px-2 py-1 rounded-lg border border-amber-100 items-center gap-1 flex">
                        <Clock className="w-3 h-3" />
                        Dừng: {formatTravelTime(totalDwellMinutes)}
                      </div>
                    )}
                  </div>

                  {/* Scrollable content body with proper z-index layering */}
                  <div className="child-nodes-list-wrapper">
                    {/* Folder child content box - Grid accordion for exclusive expansion */}
                    <div className={`folder-child-content-box ${expandedStageId === leg.id ? 'expanded' : ''}`}>
                      <div className="child-nodes-list relative">
                      {/* Vertical Line for the whole leg - Dynamic height */}
                      <div className="absolute left-6 top-16 w-0.5 bg-blue-100 -z-0 h-full" />

                      <div className="ml-2">
                        {/* Nút thêm nhanh "Điểm xuất phát" cho Chặng 1 nếu chưa có */}
                    {legIdx === 0 && !leg.locations.some((loc: any) => loc.plannedStart && new Date(loc.plannedStart).getTime() === 0) && (
                      <div className="relative flex group mb-6 opacity-80 hover:opacity-100 transition-opacity">
                        <div className="z-10 mt-1.5 mr-4">
                          <div className="w-8 h-8 bg-white rounded-full border-2 border-dashed border-blue-200 flex items-center justify-center text-blue-400">
                            <MapPin className="w-4 h-4" />
                          </div>
                        </div>
                        <button 
                          onClick={() => onAddLocation?.(leg.id, true)}
                          className="flex-1 bg-blue-50/20 dark:bg-slate-800/20 p-4 rounded-xl border border-dashed border-blue-100 dark:border-slate-700 hover:border-blue-400 dark:hover:border-blue-400 hover:bg-blue-50 dark:hover:bg-slate-800/40 transition-all flex items-center justify-between group"
                        >
                          <div className="text-left">
                            <span className="inline-block px-2 py-0.5 bg-blue-50 dark:bg-slate-700 text-blue-600 dark:text-blue-300 text-[10px] font-bold rounded-md mb-1 uppercase tracking-wider">Điểm xuất phát</span>
                            <h3 className="font-bold text-gray-400 dark:text-slate-400 text-sm italic">Nhấn để ghim điểm bắt đầu cho Tour...</h3>
                          </div>
                          <Plus className="w-5 h-5 text-blue-500 group-hover:scale-110 transition-transform" />
                        </button>
                      </div>
                    )}

                    {/* Nút thêm nhanh "Điểm kết thúc" cho Chặng cuối nếu chưa có */}
                    {legIdx === legs.length - 1 && !legs.some((l: any) => l.locations.some((loc: any) => loc.plannedEnd && new Date(loc.plannedEnd).getTime() === 0)) && (
                      <div className="relative flex group mb-6 opacity-80 hover:opacity-100 transition-opacity">
                        <div className="z-10 mt-1.5 mr-4">
                          <div className="w-8 h-8 bg-white dark:bg-slate-800 rounded-full border-2 border-dashed border-red-200 dark:border-red-700 flex items-center justify-center text-red-400">
                            <Flag className="w-4 h-4" />
                          </div>
                        </div>
                        <button 
                          onClick={() => onAddLocation?.(leg.id, false, true)}
                          className="flex-1 bg-red-50/20 dark:bg-red-900/20 p-4 rounded-xl border border-dashed border-red-100 dark:border-red-700 hover:border-red-400 dark:hover:border-red-400 hover:bg-red-50 dark:hover:bg-red-900/40 transition-all flex items-center justify-between group"
                        >
                          <div className="text-left">
                            <span className="inline-block px-2 py-0.5 bg-red-50 dark:bg-red-700 text-red-600 dark:text-red-300 text-[10px] font-bold rounded-md mb-1 uppercase tracking-wider">Điểm kết thúc</span>
                            <h3 className="font-bold text-gray-400 dark:text-slate-400 text-sm italic">Nhấn để ghim điểm kết thúc cho Tour...</h3>
                          </div>
                          <Plus className="w-5 h-5 text-red-500 group-hover:scale-110 transition-transform" />
                        </button>
                      </div>
                    )}

                    {leg.locations.map((location: any) => {
                      // Tìm vị trí của điểm này trong toàn bộ hành trình
                      const globalIdx = allLocations.findIndex((loc: any) => loc.id === location.id);
                      const prevLocation = globalIdx > 0 ? allLocations[globalIdx - 1] : null;
                      
                      const distanceFromPrev = prevLocation 
                        ? calculateDistance(prevLocation.latitude, prevLocation.longitude, location.latitude, location.longitude)
                        : null;

                      const locationExpense = leg.expenses?.find((e: any) => e.locationId === location.id);

                      // Nhận diện điểm mốc dựa trên timestamp đặc biệt (0) thay vì chỉ số mảng
                      const isStartPoint = location.plannedStart && new Date(location.plannedStart).getTime() === 0;
                      const isEndPoint = location.plannedEnd && new Date(location.plannedEnd).getTime() === 0;

                      const plannedTimeStr = isStartPoint ? location.plannedEnd : location.plannedStart;
                      const hasValidPlannedTime = plannedTimeStr && new Date(plannedTimeStr).getTime() !== 0;

                      const dwellMinutes = (location.plannedStart && location.plannedEnd && !isStartPoint && !isEndPoint)
                        ? differenceInMinutes(parseISO(location.plannedEnd), parseISO(location.plannedStart))
                        : null;

                      return (
                        <div key={location.id}>
                          <div className="relative flex group mb-6">
                            {/* Timeline Node */}
                            <div className="z-10 -ml-3.5 mr-1.5 mt-1.5">
                              <button 
                                onClick={() => handleStatusClick(location)}
                                className={`transition-colors duration-200 ${location.status === 'COMPLETED' ? 'text-green-500' : 'text-gray-300 hover:text-blue-500'}`}
                              >
                                {location.status === 'COMPLETED' ? (
                                  <CheckCircle2 className="w-8 h-8 bg-white rounded-full" />
                                ) : (
                                  <Circle className="w-8 h-8 bg-white rounded-full fill-white" />
                                )}
                              </button>
                            </div>

                            {/* Card Content */}
                            <div 
                              onClick={() => onNavigate?.(location)}
                              className={`flex-1 bg-white p-4 rounded-xl border transition-all duration-200 cursor-pointer ${
                                location.status === 'COMPLETED' ? 'border-green-100 bg-green-50/30' : 'border-gray-100 shadow-sm hover:shadow-md'
                              }`}
                            >
                              <div className="flex justify-between items-start">
                                <div>
                                  {isStartPoint && (
                                    <span className="inline-block px-2 py-0.5 bg-green-100 text-green-700 text-[10px] font-bold rounded-md mb-1 uppercase tracking-wider">Điểm bắt đầu</span>
                                  )}
                                  {isEndPoint && (
                                    <span className="inline-block px-2 py-0.5 bg-red-100 text-red-700 text-[10px] font-bold rounded-md mb-1 uppercase tracking-wider">Điểm kết thúc</span>
                                  )}
                                  <h3 
                                    onClick={(e) => {
                                      e.stopPropagation();
                                      onNavigate?.(location);
                                    }}
                                    className={`font-semibold text-lg cursor-pointer hover:text-blue-600 transition-colors select-none ${location.status === 'COMPLETED' ? 'text-gray-500 line-through' : 'text-gray-800'}`}
                                  >
                                    {location.name}
                                  </h3>
                                  <div className="flex items-center text-sm text-gray-500 mt-1">
                                    <MapPin className="w-3 h-3 mr-1" />
                                    <span className="truncate max-w-[200px] sm:max-w-md">{location.address}</span>
                                  </div>
                                  {location.note && (
                                    <div className="mt-2 text-xs text-gray-600 bg-gray-50 p-2 rounded-lg border border-gray-100 italic">
                                      {location.note}
                                    </div>
                                  )}
                                  {dwellMinutes !== null && (
                                    <div className="flex items-center text-xs text-amber-600 font-medium mt-1">
                                      <Clock className="w-3 h-3 mr-1" />
                                      <span>Thời gian dừng: {formatTravelTime(dwellMinutes)}</span>
                                    </div>
                                  )}
                                   {locationExpense && (
                                     <div className="mt-2 text-xs text-indigo-600 bg-indigo-50/80 p-2 rounded-lg border border-indigo-100 space-y-1">
                                       <div className="flex items-center gap-1 font-bold">
                                         <Zap className="w-3 h-3" />
                                         <span>Chi phí: {Number(locationExpense.amount).toLocaleString()}đ</span>
                                       </div>
                                       {locationExpense.description && (
                                         <div className="text-[10px] text-gray-600">Dịch vụ: {locationExpense.description}</div>
                                       )}
                                       {locationExpense.note && (
                                         <div className="text-[10px] text-gray-500 italic">{locationExpense.note}</div>
                                       )}
                                       {locationExpense.paidBy && (
                                         <div className="text-[10px] font-semibold text-indigo-700">Đã thanh toán: {locationExpense.paidBy.name}</div>
                                       )}
                                     </div>
                                   )}
                                </div>
                                
                                <div className="text-right flex flex-col items-end" onClick={(e) => e.stopPropagation()}>
                                  <div className="flex gap-1 mb-2">
                                    {onQuickNote && !isPublicView && (
                                      <button
                                        onClick={(e) => {
                                          e.stopPropagation();
                                          onQuickNote({ legId: leg.id, location, leg });
                                        }}
                                        className="flex items-center gap-1 px-2 py-1 bg-gray-50 hover:bg-blue-50 text-gray-400 hover:text-blue-600 rounded-lg text-[10px] font-bold transition-all border border-gray-100 hover:border-blue-100"
                                        title="Ghi chú nhanh"
                                      >
                                        <FileText className="w-4 h-4" />
                                      </button>
                                    )}
                                    <button
                                      onClick={(e) => {
                                        e.stopPropagation();
                                        setCommentLocationId(location.id);
                                        setCommentLocationName(location.name);
                                        setIsCommentModalOpen(true);
                                      }}
                                      className="flex items-center gap-1 px-2 py-1 bg-gray-50 hover:bg-blue-50 text-gray-400 hover:text-blue-600 rounded-lg text-[10px] font-bold transition-all border border-gray-100 hover:border-blue-100"
                                    >
                                      <MessageSquare className="w-3 h-3" />
                                      {location._count?.comments > 0 && `(${location._count.comments})`}
                                    </button>
                                  </div>
                                  <div className="flex items-center text-sm font-black text-blue-600">
                                    <Clock className="w-3 h-3 mr-1" />
                                    {hasValidPlannedTime ? format(parseISO(plannedTimeStr), 'HH:mm') : '--:--'}
                                  </div>
                                  {location.status === 'COMPLETED' && location.actualStart && (
                                    <div className="text-[10px] text-gray-400 mt-1 italic">
                                      Thực tế: {format(parseISO(location.actualStart), 'HH:mm')}
                                    </div>
                                  )}
                                  {canEdit && ( // Allow editing and deleting of all locations if user has edit permissions
                                    <div className="flex gap-1 mt-2">
                                      <button 
                                        onClick={(e) => {
                                          e.stopPropagation();
                                          onEditLocation?.(location);
                                        }}
                                        className="p-1 text-gray-400 hover:text-blue-600 transition-colors"
                                      >
                                        <Edit2 className="w-3.5 h-3.5" />
                                      </button>
                                      <button 
                                        onClick={(e) => {
                                          e.stopPropagation();
                                          handleDeleteLocation(location.id);
                                        }}
                                        className="p-1 text-gray-400 hover:text-red-600 transition-colors"
                                      >
                                        <Trash2 className="w-3.5 h-3.5" />
                                      </button>
                                    </div>
                                  )}
                                </div>
                              </div>

                              {/* Logic tính toán độ lệch thời gian */}
                              <TimeVariance planned={hasValidPlannedTime ? plannedTimeStr : ''} actual={location.actualStart || null} />
                            </div>
                          </div>

                          {/* Hiển thị quãng đường di chuyển từ điểm trước ĐẾN điểm hiện tại */}
                          {distanceFromPrev !== null && distanceFromPrev > 0 && (
                            <div className="ml-14 -mt-4 mb-6 flex items-center gap-2 animate-in fade-in slide-in-from-left-2 duration-500">
                              <div className="flex items-center gap-1.5 px-3 py-1.5 bg-blue-50 text-blue-600 rounded-xl border border-blue-100 shadow-sm">
                                <Navigation className="w-3 h-3 rotate-45" />
                                <span className="text-[10px] font-black uppercase tracking-tighter">
                                  +{distanceFromPrev.toFixed(1)} km từ {prevLocation?.name.split(',')[0]}
                                </span>
                              </div>
                            </div>
                          )}
                        </div>
                      );
                    })}
                      </div>                    {/* End of ml-2 wrapper */}
                      </div>                    {/* End of child-nodes-list */}
                    </div>                      {/* End of folder-child-content-box */}
                  </div>                      {/* End of child-nodes-list-wrapper */}
                </section>
              );
          })
        )}

        {/* Actions at the bottom of the list */}
        {canEdit && ( // Only show these buttons if canEdit
          <div className="flex flex-col gap-3 pb-20 mt-8">
            <button
              onClick={handleDeclareLegs}
              className="w-full py-4 rounded-2xl bg-white dark:bg-slate-800 text-blue-600 dark:text-blue-300 border-2 border-dashed border-blue-200 dark:border-slate-700 hover:bg-blue-50 dark:hover:bg-slate-700 transition-all flex items-center justify-center gap-2 text-sm font-bold"
            >
              <List className="w-5 h-5" /> 
              {legs.length > 0 ? "Khai báo lại số lượng chặng" : "Bắt đầu bằng việc khai báo số chặng"}
            </button>
            <button
              onClick={handleAddLeg}
              className="w-full py-4 rounded-2xl bg-blue-600 dark:bg-blue-700 text-white shadow-lg shadow-blue-100 hover:bg-blue-700 transition-all flex items-center justify-center gap-2 text-sm font-bold"
            >
              <Plus className="w-5 h-5" /> Thêm chặng lẻ vào cuối
            </button>
          </div>
        )}

      {/* Modal Khai báo số chặng (Popover) */}
      {isLegCountModalOpen && (
            <div className="fixed inset-0 z-[4000] flex items-center justify-center p-4">
              <div className="absolute inset-0 bg-gray-900/60 dark:bg-slate-950/60 backdrop-blur-sm animate-in fade-in duration-200" onClick={() => setIsLegCountModalOpen(false)} />
              <div className="relative w-full max-w-sm bg-white dark:bg-slate-900 rounded-[32px] shadow-2xl p-8 animate-in zoom-in-95 duration-200">
                <div className="flex justify-between items-center mb-6">
                  <h3 className="text-xl font-black text-gray-900 dark:text-white">Số chặng lộ trình</h3>
                  <button onClick={() => setIsLegCountModalOpen(false)} className="p-2 hover:bg-gray-100 dark:hover:bg-slate-800 rounded-full transition-colors">
                    <X className="w-5 h-5 text-gray-400 dark:text-slate-400" />
                  </button>
                </div>
                
                <p className="text-sm text-gray-500 dark:text-slate-400 mb-6 leading-relaxed">
                  Bạn muốn chia chuyến đi này thành bao nhiêu chặng nhỏ? (Tối đa 20 chặng)
                </p>

                <div className="flex items-center justify-center gap-6 mb-8">
                  <button 
                    onClick={() => setTempLegCount(Math.max(1, tempLegCount - 1))}
                    className="w-12 h-12 rounded-2xl border-2 border-gray-100 dark:border-slate-700 flex items-center justify-center text-2xl font-bold text-gray-400 dark:text-slate-400 hover:border-blue-200 dark:hover:border-blue-500 hover:text-blue-600 dark:hover:text-blue-400 transition-all"
                  >
                    -
                  </button>
                  <span className="text-4xl font-black text-blue-600 dark:text-blue-400 w-12 text-center">{tempLegCount}</span>
                  <button 
                    onClick={() => setTempLegCount(Math.min(20, tempLegCount + 1))}
                    className="w-12 h-12 rounded-2xl border-2 border-gray-100 dark:border-slate-700 flex items-center justify-center text-2xl font-bold text-gray-400 dark:text-slate-400 hover:border-blue-200 dark:hover:border-blue-500 hover:text-blue-600 dark:hover:text-blue-400 transition-all"
                  >
                    +
                  </button>
                </div>

                <button
                  onClick={confirmDeclareLegs}
                  className="w-full py-4 bg-blue-600 dark:bg-blue-700 hover:bg-blue-700 dark:hover:bg-blue-800 text-white font-bold rounded-2xl shadow-lg shadow-blue-100 dark:shadow-blue-950 transition-all active:scale-95"
                >
                  Xác nhận
                </button>
              </div>
            </div>
          )}

          {/* Modal Chỉnh sửa Chặng (Popover) */}
          {isEditModalOpen && (
            <div className="fixed inset-0 z-[4000] flex items-center justify-center p-4">
              <div className="absolute inset-0 bg-gray-900/60 dark:bg-slate-950/60 backdrop-blur-sm animate-in fade-in duration-200" onClick={() => setIsEditModalOpen(false)} />
              <div className="relative w-full max-w-md bg-white dark:bg-slate-900 rounded-[32px] shadow-2xl p-8 animate-in zoom-in-95 duration-200">
                <div className="flex justify-between items-center mb-6">
                  <h3 className="text-xl font-black text-gray-900 dark:text-white">Chỉnh sửa Chặng</h3>
                  <button onClick={() => setIsEditModalOpen(false)} className="p-2 hover:bg-gray-100 dark:hover:bg-slate-800 rounded-full transition-colors">
                    <X className="w-5 h-5 text-gray-400 dark:text-slate-400" />
                  </button>
                </div>
                
                <div className="space-y-5">
                  <div>
                    <label className="block text-xs font-black text-gray-400 dark:text-slate-400 uppercase tracking-widest mb-2 ml-1">Tên chặng</label>
                    <input
                      type="text"
                      value={editingLegData.note}
                      onChange={(e) => setEditingLegData({ ...editingLegData, note: e.target.value })}
                      placeholder="VD: Ngày 1: Khởi hành"
                      className="w-full px-5 py-4 bg-gray-50 dark:bg-slate-800 border border-gray-100 dark:border-slate-700 rounded-2xl focus:ring-2 focus:ring-blue-500 outline-none transition-all text-sm text-gray-800 dark:text-white"
                    />
                  </div>

                  <div>
                    <label className="flex items-center gap-2 text-xs font-black text-gray-400 dark:text-slate-400 uppercase tracking-widest mb-2 ml-1">
                      <AlignLeft className="w-3 h-3" /> Mô tả chi tiết
                    </label>
                    <textarea
                      value={editingLegData.description}
                      onChange={(e) => setEditingLegData({ ...editingLegData, description: e.target.value })}
                      placeholder="Mô tả các hoạt động chính trong chặng này..."
                      className="w-full px-5 py-4 bg-gray-50 dark:bg-slate-800 border border-gray-100 dark:border-slate-700 rounded-2xl focus:ring-2 focus:ring-blue-500 outline-none transition-all text-sm min-h-[120px] resize-none text-gray-800 dark:text-white"
                    />
                  </div>

                  <div className="grid grid-cols-2 gap-4">
                    <div>
                      <label className="flex items-center gap-2 text-xs font-black text-gray-400 dark:text-slate-400 uppercase tracking-widest mb-2 ml-1">
                        <CalendarIcon className="w-3 h-3" /> Bắt đầu
                      </label>
                      <input
                        type="date"
                        value={editingLegData.startDate}
                        onChange={(e) => setEditingLegData({ ...editingLegData, startDate: e.target.value })}
                        className="w-full px-5 py-4 bg-gray-50 dark:bg-slate-800 border border-gray-100 dark:border-slate-700 rounded-2xl focus:ring-2 focus:ring-blue-500 outline-none transition-all text-sm text-gray-800 dark:text-white"
                      />
                    </div>
                    <div>
                      <label className="block text-xs font-black text-gray-400 dark:text-slate-400 uppercase tracking-widest mb-2 ml-1">Kết thúc</label>
                      <input
                        type="date"
                        value={editingLegData.endDate}
                        onChange={(e) => setEditingLegData({ ...editingLegData, endDate: e.target.value })}
                        className="w-full px-5 py-4 bg-gray-50 dark:bg-slate-800 border border-gray-100 dark:border-slate-700 rounded-2xl focus:ring-2 focus:ring-blue-500 outline-none transition-all text-sm text-gray-800 dark:text-white"
                      />
                    </div>
                  </div>
                </div>

                <div className="grid grid-cols-2 gap-3 mt-8">
                  <button
                    onClick={() => setIsEditModalOpen(false)}
                    className="py-4 bg-gray-100 dark:bg-slate-800 hover:bg-gray-200 dark:hover:bg-slate-700 text-gray-600 dark:text-slate-300 font-bold rounded-2xl transition-all active:scale-95"
                  >
                    Hủy
                  </button>
                  <button
                    onClick={saveLegEdit}
                    className="py-4 bg-blue-600 dark:bg-blue-700 hover:bg-blue-700 dark:hover:bg-blue-800 text-white font-bold rounded-2xl shadow-lg shadow-blue-100 dark:shadow-blue-950 transition-all active:scale-95"
                  >
                    Lưu thay đổi
                  </button>
                </div>
              </div>
            </div>
          )}
          <CommentModal
            isOpen={isCommentModalOpen}
            onClose={() => setIsCommentModalOpen(false)}
            locationId={commentLocationId}
            locationName={commentLocationName}
            isPublicView={isPublicView}
            onCommentAdded={() => handleCommentIncrement(commentLocationId)}
            onCommentDeleted={() => handleCommentDecrement(commentLocationId)}
          />
        </div>
  );
};