import React, { useMemo, useState, useEffect } from 'react';
import { Edit2, Filter, Columns, Layers, Download, ChevronLeft, ChevronRight, ChevronsLeft, ChevronsRight } from 'lucide-react';
import AdvancedFiltersModal from './AdvancedFiltersModal';

const ExcelTable = ({ 
    data, 
    columns, 
    filterDefs = [], 
    onEdit, 
    loading = false, 

    pageSize: initialPageSize = 50,
    selectedIds = [],
    onSelectionChange,
    rowKey = 'id'
}) => {
  const [showFilters, setShowFilters] = useState(false);
  const [filters, setFilters] = useState({});
  const [sortConfig, setSortConfig] = useState({ key: null, direction: 'asc' });
  
  // Pagination State
  const [currentPage, setCurrentPage] = useState(1);
  const [pageSize, setPageSize] = useState(initialPageSize);

  // ... (existing useMemo logic) ...
  
  // Helper para lidar com seleção


  // 1. Extract Unique Values...
  const options = React.useMemo(() => {
    const opts = {};
    const getUnique = (key) => [...new Set(data.map(item => item[key]).filter(Boolean))].sort();
    
    filterDefs.forEach(def => {
        if (def.type === 'select') {
            opts[def.field] = getUnique(def.field);
        }
    });

    return opts;
  }, [data, filterDefs]);

  // 2. Process Data...
  const processedData = React.useMemo(() => {
    let result = [...data];

    // Filter
    Object.keys(filters).forEach(key => {
      if (filters[key]) {
        result = result.filter(item => {
           const itemValue = String(item[key] || '').toLowerCase();
           const filterValue = String(filters[key]).toLowerCase();
           return itemValue.includes(filterValue);
        });
      }
    });

    // Sort
    if (sortConfig.key) {
      result.sort((a, b) => {
        const valA = a[sortConfig.key] || '';
        const valB = b[sortConfig.key] || '';
        
        if (valA < valB) return sortConfig.direction === 'asc' ? -1 : 1;
        if (valA > valB) return sortConfig.direction === 'asc' ? 1 : -1;
        return 0;
      });
    }

    return result;
  }, [data, filters, sortConfig]);

  // 3. Paginate...
  const paginatedData = React.useMemo(() => {
    const startIndex = (currentPage - 1) * pageSize;
    return processedData.slice(startIndex, startIndex + pageSize);
  }, [processedData, currentPage, pageSize]);

  // Reset page...
  useEffect(() => {
    setCurrentPage(1);
  }, [filters, sortConfig, pageSize]);

  // Helper para lidar com seleção (Movido para cá para ter acesso a processedData)
  const handleSelectAll = (e) => {
    if (!onSelectionChange) return;
    if (e.target.checked) {
        const allIds = processedData.map(item => item[rowKey]);
        onSelectionChange(allIds);
    } else {
        onSelectionChange([]);
    }
  };

  const handleSelectRow = (id) => {
    if (!onSelectionChange) return;
    const newSelected = selectedIds.includes(id)
      ? selectedIds.filter(x => x !== id)
      : [...selectedIds, id];
    onSelectionChange(newSelected);
  };

  const isAllSelected = processedData && processedData.length > 0 && processedData.every(item => selectedIds.includes(item[rowKey]));
  const isIndeterminate = processedData && processedData.some(item => selectedIds.includes(item[rowKey])) && !isAllSelected;


  const totalPages = Math.ceil(processedData.length / pageSize);

  const handleSort = (key) => {
    setSortConfig(current => ({
      key,
      direction: current.key === key && current.direction === 'asc' ? 'desc' : 'asc'
    }));
  };

  const handleApplyFilters = (newFilters) => {
    setFilters(newFilters);
    setShowFilters(false);
  };





  return (
    <>
      <div className="bg-white dark:bg-[#1b1b1b] border border-slate-200 dark:border-[#2a2a2a] rounded-xl flex flex-col h-full w-full max-w-full min-w-0 text-xs font-sans antialiased text-slate-700 dark:text-[#e0e0e0] relative overflow-hidden transition-colors">
        
        {/* Loading Overlay */}
        {loading && (
            <div className="absolute inset-0 z-50 bg-white/80 dark:bg-[#1b1b1b]/80 backdrop-blur-sm flex items-center justify-center">
                <div className="flex flex-col items-center gap-4">
                    <div className="relative">
                        <div className="w-12 h-12 border-4 border-slate-200 dark:border-[#252525] border-t-emerald-500 rounded-full animate-spin"></div>
                        <div className="absolute inset-0 flex items-center justify-center">
                            <div className="w-2 h-2 bg-emerald-500 rounded-full animate-pulse"></div>
                        </div>
                    </div>
                    <span className="text-emerald-500 font-bold uppercase tracking-widest text-[10px] animate-pulse">Carregando Dados...</span>
                </div>
            </div>
        )}

      {/* 1. Top Toolbar */}
      <div className="flex items-center justify-between px-3 py-2 bg-white dark:bg-[#1b1b1b] border-b border-slate-200 dark:border-[#2a2a2a]">
        
        {/* Left Actions */}
        <div className="flex items-center gap-3">
            {/* Filter Button */}
            <button 
                onClick={() => setShowFilters(true)}
                className={`flex items-center gap-1.5 px-3 py-1.5 border rounded font-semibold transition-colors ${
                    Object.keys(filters).length > 0 
                    ? 'bg-blue-50 dark:bg-blue-900/30 border-blue-200 dark:border-blue-800 text-blue-600 dark:text-blue-400 hover:bg-blue-100 dark:hover:bg-blue-900/50' 
                    : 'bg-slate-50 dark:bg-[#252525] hover:bg-slate-100 dark:hover:bg-[#333] border-slate-200 dark:border-[#333] text-slate-600 dark:text-stone-300'
                }`}
            >
                <Filter size={14} strokeWidth={2.5} />
                <span className="uppercase tracking-wide text-[11px]">
                    {Object.keys(filters).length > 0 ? `${Object.keys(filters).length} Filtros` : 'Filtros Avançados'}
                </span>
            </button>

             {/* Actions Button (Green Highlight) - Commented as requested
             <button className="flex items-center gap-1.5 px-3 py-1.5 bg-emerald-50 dark:bg-[#1f2824] hover:bg-emerald-100 dark:hover:bg-[#25302b] border border-emerald-200 dark:border-[#2b3832] rounded text-emerald-600 dark:text-emerald-400 font-semibold transition-colors">
                <span className="uppercase tracking-wide text-[11px]">Ações</span>
                <span className="bg-emerald-100 dark:bg-[#15201b] text-emerald-600 px-1 rounded text-[9px]">
                    <span className="w-2 h-2 rounded-full bg-emerald-500 inline-block"></span>
                </span>
            </button>
            */}
        </div>

        {/* Right Actions - Commented out as requested
        <div className="flex items-center gap-2">
            <button className="flex items-center gap-1.5 px-3 py-1.5 hover:bg-[#252525] border border-transparent hover:border-[#333] rounded text-stone-400 transition-colors">
                <Columns size={12} />
                <span className="text-[10px] font-semibold">Colunas</span>
            </button>
            <button className="flex items-center gap-1.5 px-3 py-1.5 hover:bg-[#252525] border border-transparent hover:border-[#333] rounded text-stone-400 transition-colors">
                <Layers size={12} />
                <span className="text-[10px] font-semibold">Agrupar</span>
            </button>
             <button className="flex items-center gap-1.5 px-3 py-1.5 hover:bg-[#252525] border border-transparent hover:border-[#333] rounded text-stone-400 transition-colors">
                <Download size={12} />
                <span className="text-[10px] font-semibold">Exportar</span>
            </button>
        </div>
        */}
      </div>


      {/* 2. Table Header (The Complex Part) */}
        <div className="overflow-x-auto overflow-y-auto flex-1 relative custom-scrollbar w-full min-w-0">
          <style>{`
            .custom-scrollbar {
              scrollbar-width: thin;
              scrollbar-color: #cbd5e1 #f8fafc;
            }
            .dark .custom-scrollbar {
              scrollbar-color: #334155 #0f172a;
            }
            .custom-scrollbar::-webkit-scrollbar {
              width: 10px;
              height: 10px;
            }
            .custom-scrollbar::-webkit-scrollbar-track {
              background: #f8fafc;
            }
            .dark .custom-scrollbar::-webkit-scrollbar-track {
              background: #0f172a;
            }
            .custom-scrollbar::-webkit-scrollbar-thumb {
              background: #cbd5e1;
              border: 2px solid #f8fafc;
              border-radius: 6px;
            }
            .dark .custom-scrollbar::-webkit-scrollbar-thumb {
              background: #334155;
              border: 2px solid #0f172a;
            }
            .custom-scrollbar::-webkit-scrollbar-thumb:hover {
              background: #94a3b8;
            }
            .dark .custom-scrollbar::-webkit-scrollbar-thumb:hover {
              background: #475569;
            }
            .custom-scrollbar::-webkit-scrollbar-corner {
                background: #f8fafc;
            }
            .dark .custom-scrollbar::-webkit-scrollbar-corner {
                background: #0f172a;
            }
          `}</style>

        <table className="border-collapse table-fixed custom-scrollbar w-full min-w-full">
          <thead className="sticky top-0 z-20 bg-slate-50 dark:bg-[#1b1b1b] shadow-lg shadow-black/5 dark:shadow-black/20">
            <tr className="border-b border-slate-200 dark:border-[#333]">
                {/* Checkbox Header */}
                <th className="sticky left-0 z-30 bg-slate-50 dark:bg-[#1b1b1b] w-[40px] min-w-[40px] h-[40px] border-r border-[#e2e8f0] dark:border-[#333]">
                     <div className="flex items-center justify-center h-full w-full">
                         <input 
                            type="checkbox" 
                            checked={isAllSelected}
                            ref={input => { if (input) input.indeterminate = isIndeterminate; }}
                            onChange={handleSelectAll}
                            disabled={!onSelectionChange}
                            className="appearance-none w-3.5 h-3.5 border-2 border-slate-300 dark:border-slate-600 rounded-sm bg-white dark:bg-[#2a2a2a] checked:bg-emerald-500 checked:border-emerald-500 transition-all cursor-pointer relative checked:bg-[url('data:image/svg+xml;charset=UTF-8,%3Csvg%20width%3D%2214%22%20height%3D%2214%22%20viewBox%3D%220%200%2014%2014%22%20fill%3D%22none%22%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%3E%3Cpath%20d%3D%22M2.5%207L5.5%2010L11.5%204%22%20stroke%3D%22%23FFF%22%20stroke-width%3D%222%22%20stroke-linecap%3D%22round%22%20stroke-linejoin%3D%22round%22%2F%3E%3C%2Fsvg%3E')] bg-center bg-no-repeat bg-[length:70%]"
                         />
                     </div>
                </th>
                <th className="sticky left-[40px] z-30 bg-slate-50 dark:bg-[#1b1b1b] w-[60px] min-w-[60px] h-[40px] border-r border-slate-200 dark:border-[#333] px-2 text-left">
                     <div className="flex items-center h-full w-full uppercase font-bold text-slate-500 dark:text-[#e0e0e0] tracking-wider text-[11px]">
                        Ações
                     </div>
                </th>

               {/* Dynamic Columns */}
               {columns.map((col, idx) => (
                   <th 
                        key={idx} 
                        onClick={() => handleSort(col.field)}
                        className="h-[40px] border-r border-slate-200 dark:border-[#333] bg-slate-50 dark:bg-[#1b1b1b] px-3 relative group hover:bg-slate-100 dark:hover:bg-[#222] transition-colors cursor-pointer select-none" 
                        style={{ width: col.width, minWidth: col.width }}
                    >
                       <div className="flex items-center justify-between h-full w-full">
                           <div className="flex items-center gap-1.5">
                                <span className={`uppercase font-bold tracking-wider text-[11px] ${sortConfig.key === col.field ? 'text-emerald-600 dark:text-emerald-500' : 'text-slate-500 dark:text-[#e0e0e0]'}`}>
                                    {col.header}
                                </span>
                           </div>
                           
                           {/* Sort/Menu Icons */}
                           <div className={`flex flex-col gap-0.5 ${sortConfig.key === col.field ? 'opacity-100' : 'opacity-40 group-hover:opacity-100'}`}>
                                <svg width="8" height="4" viewBox="0 0 8 4" fill="currentColor" className={`${sortConfig.key === col.field && sortConfig.direction === 'asc' ? 'text-emerald-600 dark:text-emerald-500' : 'text-slate-400 dark:text-stone-400'} rotate-180`}>
                                    <path d="M4 4L0 0H8L4 4Z" />
                                </svg>
                                <svg width="8" height="4" viewBox="0 0 8 4" fill="currentColor" className={`${sortConfig.key === col.field && sortConfig.direction === 'desc' ? 'text-emerald-600 dark:text-emerald-500' : 'text-slate-400 dark:text-stone-400'}`}>
                                    <path d="M4 4L0 0H8L4 4Z" />
                                </svg>
                           </div>
                       </div>
                       
                       {/* Column Resizer Handle */}
                       <div className="absolute right-0 top-0 bottom-0 w-[4px] cursor-col-resize hover:bg-emerald-500/50 z-10 translate-x-1/2" onClick={(e) => e.stopPropagation()} />
                   </th>
               ))}
                {/* Spacer for scrollbar */}
                <th className="bg-slate-50 dark:bg-[#1b1b1b] border-b border-slate-200 dark:border-[#333]"></th>
            </tr>
          </thead>

          {/* 3. Table Body - Displaying Paginated Data */}
          <tbody className="bg-white dark:bg-[#151515]">
            {paginatedData.map((row, idx) => (
                <tr key={idx} className={`h-[44px] border-b border-slate-100 dark:border-[#252525] hover:bg-slate-50 dark:hover:bg-[#202020] transition-colors group text-sm ${idx % 2 === 0 ? 'bg-white dark:bg-[#151515]' : 'bg-slate-50/50 dark:bg-[#181818]'} ${idx === 0 ? '!bg-slate-100 dark:!bg-[#2b2b2b]' : ''}`}>
                    
                    {/* Checkbox Cell */}
                    <td className={`sticky left-0 z-10 border-r border-slate-100 dark:border-[#252525] px-0 text-center ${idx % 2 === 0 ? 'bg-white dark:bg-[#151515]' : 'bg-slate-50/50 dark:bg-[#181818]'} ${idx === 0 ? '!bg-slate-100 dark:!bg-[#2b2b2b]' : ''} group-hover:bg-slate-50 dark:group-hover:bg-[#202020]`}>
                    <div className="flex items-center justify-center h-full w-full">
                         <input 
                            type="checkbox" 
                            checked={selectedIds.includes(row[rowKey])}
                            onChange={() => handleSelectRow(row[rowKey])}
                            disabled={!onSelectionChange}
                            className="appearance-none w-3.5 h-3.5 border-2 border-slate-300 dark:border-slate-600 rounded-sm bg-white dark:bg-[#2a2a2a] checked:bg-emerald-500 checked:border-emerald-500 transition-all cursor-pointer relative checked:bg-[url('data:image/svg+xml;charset=UTF-8,%3Csvg%20width%3D%2214%22%20height%3D%2214%22%20viewBox%3D%220%200%2014%2014%22%20fill%3D%22none%22%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%3E%3Cpath%20d%3D%22M2.5%207L5.5%2010L11.5%204%22%20stroke%3D%22%23FFF%22%20stroke-width%3D%222%22%20stroke-linecap%3D%22round%22%20stroke-linejoin%3D%22round%22%2F%3E%3C%2Fsvg%3E')] bg-center bg-no-repeat bg-[length:70%]"
                         />
                    </div>
                </td>

                    {/* Actions Cell */}
                    <td className={`sticky left-[40px] z-10 border-r border-slate-100 dark:border-[#252525] px-0 text-center ${idx % 2 === 0 ? 'bg-white dark:bg-[#151515]' : 'bg-slate-50/50 dark:bg-[#181818]'} ${idx === 0 ? '!bg-slate-100 dark:!bg-[#2b2b2b]' : ''} group-hover:bg-slate-50 dark:group-hover:bg-[#202020]`}>
                        <div className="flex items-center justify-center h-full w-full gap-2">
                             <button 
                                onClick={() => onEdit && onEdit(row)}
                                className="text-slate-500 dark:text-stone-500 hover:text-emerald-600 dark:hover:text-stone-300 transition-colors p-1"
                             >
                                <Edit2 size={16} strokeWidth={2} />
                             </button>
                        </div>
                    </td>
                    
                    {/* Data Cells */}
                    {columns.map((col, cIdx) => (
                        <td key={cIdx} className="border-r border-slate-100 dark:border-[#252525] px-3 whitespace-nowrap overflow-hidden text-ellipsis text-slate-700 dark:text-stone-300">
                             {col.render ? col.render(row) : (
                                 <span className={col.className}>{row[col.field] || '-'}</span>
                             )}
                        </td>
                    ))}
                     <td className=""></td>
                </tr>
            ))}
             {/* Empty rows filler if needed */}
             {!loading && paginatedData.length === 0 && (
                 <tr>
                     <td colSpan={columns.length + 3} className="h-24 text-center text-stone-500 italic">
                         {filters && Object.keys(filters).length > 0 ? 'Nenhum registro encontrado para os filtros selecionados.' : 'Nenhum registro disponível.'}
                     </td>
                 </tr>
             )}
          </tbody>
        </table>
      </div>

      {/* 4. Footer Steps (Pagination Controls) */}
      <div className="bg-slate-50 dark:bg-[#1b1b1b] border-t border-slate-200 dark:border-[#333] h-[40px] flex items-center justify-between px-2 overflow-hidden select-none">
            
            {/* Left: Totals */}
            <div className="flex h-full items-center">
                 <div className="flex flex-col justify-center px-4 h-full relative group min-w-[120px]">
                    <div className="absolute left-0 top-2 bottom-2 w-[3px] bg-emerald-500 rounded-r-sm"></div>
                    <span className="text-[10px] uppercase font-bold text-slate-500 tracking-wider">Total</span>
                    <span className="text-sm font-bold text-slate-800 dark:text-stone-200 leading-none mt-0.5">{processedData.length}</span>
                    
                    <div className="absolute right-0 top-2 bottom-2 w-[1px] bg-slate-200 dark:bg-[#333]"></div>
                 </div>

                 <div className="flex flex-col justify-center px-4 h-full relative group min-w-[100px]">
                    <div className="absolute left-0 top-2 bottom-2 w-[3px] bg-emerald-500 rounded-r-sm opacity-0 group-hover:opacity-100 transition-opacity"></div>
                    <span className="text-[10px] uppercase font-bold text-slate-500 tracking-wider">Página</span>
                    <span className="text-sm font-bold text-slate-800 dark:text-stone-200 leading-none mt-0.5">{currentPage} / {totalPages || 1}</span>
                 </div>
            </div>

            {/* Right: Pagination Controls */}
            <div className="flex items-center gap-1 pr-2">
                 <div className="text-[11px] text-slate-500 mr-3 hidden md:block">
                    Exibindo <span className="font-bold text-slate-700 dark:text-stone-300">{Math.min((currentPage - 1) * pageSize + 1, processedData.length)} a {Math.min(currentPage * pageSize, processedData.length)}</span>
                 </div>

                {/* First Page */}
                <button 
                  onClick={() => setCurrentPage(1)}
                  disabled={currentPage === 1}
                  className="w-7 h-7 flex items-center justify-center rounded bg-white dark:bg-[#151515] border border-slate-200 dark:border-[#333] hover:border-emerald-500 dark:hover:border-[#555] text-slate-500 dark:text-stone-400 group disabled:opacity-30 disabled:cursor-not-allowed transition-colors"
                >
                     <ChevronsLeft size={14} />
                </button>

                {/* Prev Page */}
                <button 
                  onClick={() => setCurrentPage(p => Math.max(1, p - 1))}
                  disabled={currentPage === 1}
                  className="w-7 h-7 flex items-center justify-center rounded bg-white dark:bg-[#151515] border border-slate-200 dark:border-[#333] hover:border-emerald-500 dark:hover:border-[#555] text-slate-500 dark:text-stone-400 disabled:opacity-30 disabled:cursor-not-allowed transition-colors"
                >
                     <ChevronLeft size={14} />
                </button>
                
                {/* Manual Page Buttons (Simple logic) */}
                <div className="flex gap-1 mx-1">
                    <button className="w-7 h-7 flex items-center justify-center rounded bg-emerald-500 text-white dark:text-black font-bold text-[11px] transition-colors shadow-lg shadow-emerald-500/10">
                        {currentPage}
                    </button>
                </div>

                {/* Next Page */}
                 <button 
                  onClick={() => setCurrentPage(p => Math.min(totalPages, p + 1))}
                  disabled={currentPage === totalPages || totalPages === 0}
                  className="w-7 h-7 flex items-center justify-center rounded bg-white dark:bg-[#151515] border border-slate-200 dark:border-[#333] hover:border-emerald-500 dark:hover:border-[#555] text-slate-500 dark:text-stone-400 disabled:opacity-30 disabled:cursor-not-allowed transition-colors"
                >
                     <ChevronRight size={14} />
                </button>

                {/* Last Page */}
                 <button 
                  onClick={() => setCurrentPage(totalPages)}
                  disabled={currentPage === totalPages || totalPages === 0}
                  className="w-7 h-7 flex items-center justify-center rounded bg-white dark:bg-[#151515] border border-slate-200 dark:border-[#333] hover:border-emerald-500 dark:hover:border-[#555] text-slate-500 dark:text-stone-400 group disabled:opacity-30 disabled:cursor-not-allowed transition-colors"
                >
                    <ChevronsRight size={14} />
                </button>
            </div>
      </div>
      </div>

      <AdvancedFiltersModal 
        isOpen={showFilters} 
        onClose={() => setShowFilters(false)} 
        onApply={handleApplyFilters}
        options={options}
        initialFilters={filters}
        config={filterDefs}
      />
    </>
  );
};

export default ExcelTable;
