/**
 * Data Table Component
 * Sortable and filterable data table for analytics
 */

import { useState, useMemo } from 'react';

interface Column {
  key: string;
  header: string;
  sortable?: boolean;
  render?: (value: any, row: any) => React.ReactNode;
  width?: string;
  align?: 'left' | 'center' | 'right';
}

interface DataTableProps {
  data: any[];
  columns: Column[];
  title?: string;
  pageSize?: number;
  showSearch?: boolean;
  searchPlaceholder?: string;
}

type SortDirection = 'asc' | 'desc' | null;

export default function DataTable({
  data,
  columns,
  title,
  pageSize = 10,
  showSearch = true,
  searchPlaceholder = 'Search...',
}: DataTableProps) {
  const [sortKey, setSortKey] = useState<string | null>(null);
  const [sortDir, setSortDir] = useState<SortDirection>(null);
  const [search, setSearch] = useState('');
  const [page, setPage] = useState(0);

  const filteredData = useMemo(() => {
    if (!search) return data;

    const searchLower = search.toLowerCase();
    return data.filter((row) =>
      columns.some((col) => {
        const value = row[col.key];
        return String(value).toLowerCase().includes(searchLower);
      })
    );
  }, [data, columns, search]);

  const sortedData = useMemo(() => {
    if (!sortKey || !sortDir) return filteredData;

    return [...filteredData].sort((a, b) => {
      const aVal = a[sortKey];
      const bVal = b[sortKey];

      if (aVal === bVal) return 0;
      if (aVal === null || aVal === undefined) return 1;
      if (bVal === null || bVal === undefined) return -1;

      const comparison = aVal < bVal ? -1 : 1;
      return sortDir === 'asc' ? comparison : -comparison;
    });
  }, [filteredData, sortKey, sortDir]);

  const paginatedData = useMemo(() => {
    const start = page * pageSize;
    return sortedData.slice(start, start + pageSize);
  }, [sortedData, page, pageSize]);

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

  const handleSort = (key: string) => {
    if (sortKey === key) {
      if (sortDir === 'asc') setSortDir('desc');
      else if (sortDir === 'desc') {
        setSortKey(null);
        setSortDir(null);
      }
    } else {
      setSortKey(key);
      setSortDir('asc');
    }
  };

  const getSortIcon = (key: string) => {
    if (sortKey !== key) {
      return (
        <svg className="w-4 h-4 text-gray-300" fill="none" viewBox="0 0 24 24" stroke="currentColor">
          <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M7 16V4m0 0L3 8m4-4l4 4m6 0v12m0 0l4-4m-4 4l-4-4" />
        </svg>
      );
    }
    if (sortDir === 'asc') {
      return (
        <svg className="w-4 h-4 text-green-600" fill="none" viewBox="0 0 24 24" stroke="currentColor">
          <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M5 15l7-7 7 7" />
        </svg>
      );
    }
    return (
      <svg className="w-4 h-4 text-green-600" fill="none" viewBox="0 0 24 24" stroke="currentColor">
        <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M19 9l-7 7-7-7" />
      </svg>
    );
  };

  const alignClasses = {
    left: 'text-left',
    center: 'text-center',
    right: 'text-right',
  };

  return (
    <div className="bg-white rounded-lg shadow-lg overflow-hidden">
      {/* Header */}
      <div className="px-6 py-4 border-b border-gray-200">
        <div className="flex items-center justify-between">
          {title && <h3 className="text-lg font-bold text-gray-900">{title}</h3>}
          {showSearch && (
            <div className="relative">
              <input
                type="text"
                placeholder={searchPlaceholder}
                value={search}
                onChange={(e) => {
                  setSearch(e.target.value);
                  setPage(0);
                }}
                className="pl-10 pr-4 py-2 border border-gray-200 rounded-lg text-sm focus:outline-none focus:ring-2 focus:ring-green-500"
              />
              <svg
                className="absolute left-3 top-1/2 transform -translate-y-1/2 w-4 h-4 text-gray-400"
                fill="none"
                viewBox="0 0 24 24"
                stroke="currentColor"
              >
                <path
                  strokeLinecap="round"
                  strokeLinejoin="round"
                  strokeWidth={2}
                  d="M21 21l-6-6m2-5a7 7 0 11-14 0 7 7 0 0114 0z"
                />
              </svg>
            </div>
          )}
        </div>
      </div>

      {/* Table */}
      <div className="overflow-x-auto">
        <table className="w-full">
          <thead className="bg-gray-50">
            <tr>
              {columns.map((col) => (
                <th
                  key={col.key}
                  className={`px-6 py-3 text-xs font-medium text-gray-500 uppercase tracking-wider ${
                    alignClasses[col.align || 'left']
                  } ${col.sortable !== false ? 'cursor-pointer hover:bg-gray-100' : ''}`}
                  style={{ width: col.width }}
                  onClick={() => col.sortable !== false && handleSort(col.key)}
                >
                  <div className="flex items-center space-x-1">
                    <span>{col.header}</span>
                    {col.sortable !== false && getSortIcon(col.key)}
                  </div>
                </th>
              ))}
            </tr>
          </thead>
          <tbody className="divide-y divide-gray-200">
            {paginatedData.length === 0 ? (
              <tr>
                <td colSpan={columns.length} className="px-6 py-8 text-center text-gray-500">
                  No data available
                </td>
              </tr>
            ) : (
              paginatedData.map((row, rowIndex) => (
                <tr key={rowIndex} className="hover:bg-gray-50">
                  {columns.map((col) => (
                    <td
                      key={col.key}
                      className={`px-6 py-4 whitespace-nowrap text-sm text-gray-900 ${
                        alignClasses[col.align || 'left']
                      }`}
                    >
                      {col.render ? col.render(row[col.key], row) : row[col.key]}
                    </td>
                  ))}
                </tr>
              ))
            )}
          </tbody>
        </table>
      </div>

      {/* Pagination */}
      {totalPages > 1 && (
        <div className="px-6 py-4 border-t border-gray-200 flex items-center justify-between">
          <span className="text-sm text-gray-500">
            Showing {page * pageSize + 1} to {Math.min((page + 1) * pageSize, sortedData.length)} of{' '}
            {sortedData.length} results
          </span>
          <div className="flex space-x-2">
            <button
              onClick={() => setPage(page - 1)}
              disabled={page === 0}
              className="px-3 py-1 border border-gray-200 rounded text-sm disabled:opacity-50 disabled:cursor-not-allowed hover:bg-gray-50"
            >
              Previous
            </button>
            <button
              onClick={() => setPage(page + 1)}
              disabled={page >= totalPages - 1}
              className="px-3 py-1 border border-gray-200 rounded text-sm disabled:opacity-50 disabled:cursor-not-allowed hover:bg-gray-50"
            >
              Next
            </button>
          </div>
        </div>
      )}
    </div>
  );
}