import React from 'react';
import clsx from 'clsx';
import { ChevronLeft, ChevronRight } from 'lucide-react';
import { useTranslation } from 'react-i18next';

export interface PaginationProps {
  currentPage: number;
  totalPages: number;
  total: number;
  pageSize: number;
  onPageChange: (page: number) => void;
}

export function Pagination({ currentPage, totalPages, total, pageSize, onPageChange }: PaginationProps) {
  const { t } = useTranslation();
  const start = total === 0 ? 0 : (currentPage - 1) * pageSize + 1;
  const end = Math.min(currentPage * pageSize, total);

  const pages: number[] = [];
  const maxVisible = 5;
  const halfVisible = Math.floor(maxVisible / 2);
  let startPage = Math.max(1, currentPage - halfVisible);
  let endPage = Math.min(totalPages, startPage + maxVisible - 1);
  if (endPage - startPage < maxVisible - 1) {
    startPage = Math.max(1, endPage - maxVisible + 1);
  }
  for (let i = startPage; i <= endPage; i++) {
    pages.push(i);
  }

  if (totalPages <= 1) return null;

  return (
    <nav className="flex items-center justify-between px-3 py-1.5 border-t border-secondary-200 bg-white" aria-label="Pagination">
      <div className="text-xs text-secondary-500">
        <span>{start}–{end}</span> <span>{t('table.of')}</span> <span>{total}</span>
      </div>
      <div className="flex items-center gap-0.5">
        <button
          onClick={() => onPageChange(currentPage - 1)}
          disabled={currentPage <= 1}
          className="px-1.5 py-0.5 text-xs rounded border border-secondary-300 hover:bg-secondary-50 disabled:opacity-50 disabled:cursor-not-allowed flex items-center justify-center focus:outline-none focus-visible:ring-1 focus-visible:ring-primary-500"
          aria-label={t('pagination.previous')}
        >
          <ChevronLeft className="h-3 w-3" aria-hidden="true" />
        </button>
        {startPage > 1 && (
          <>
            <button
              onClick={() => onPageChange(1)}
              className="px-1.5 py-0.5 text-xs rounded border border-secondary-300 hover:bg-secondary-50 focus:outline-none focus-visible:ring-1 focus-visible:ring-primary-500"
              aria-label={t('pagination.first')}
            >
              1
            </button>
            {startPage > 2 && <span className="px-0.5 text-secondary-400" aria-hidden="true">…</span>}
          </>
        )}
        {pages.map((page) => (
          <button
            key={page}
            onClick={() => onPageChange(page)}
            className={clsx(
              'px-1.5 py-0.5 text-xs rounded border focus:outline-none focus-visible:ring-1 focus-visible:ring-primary-500',
              page === currentPage
                ? 'border-primary-500 bg-primary-50 text-primary-700 font-semibold'
                : 'border-secondary-300 hover:bg-secondary-50'
            )}
            aria-label={t('pagination.page', { page })}
            aria-current={page === currentPage ? 'page' : undefined}
          >
            {page}
          </button>
        ))}
        {endPage < totalPages && (
          <>
            {endPage < totalPages - 1 && <span className="px-0.5 text-secondary-400" aria-hidden="true">…</span>}
            <button
              onClick={() => onPageChange(totalPages)}
              className="px-1.5 py-0.5 text-xs rounded border border-secondary-300 hover:bg-secondary-50 focus:outline-none focus-visible:ring-1 focus-visible:ring-primary-500"
              aria-label={t('pagination.last')}
            >
              {totalPages}
            </button>
          </>
        )}
        <button
          onClick={() => onPageChange(currentPage + 1)}
          disabled={currentPage >= totalPages}
          className="px-1.5 py-0.5 text-xs rounded border border-secondary-300 hover:bg-secondary-50 disabled:opacity-50 disabled:cursor-not-allowed flex items-center justify-center focus:outline-none focus-visible:ring-1 focus-visible:ring-primary-500"
          aria-label={t('pagination.next')}
        >
          <ChevronRight className="h-3 w-3" aria-hidden="true" />
        </button>
      </div>
    </nav>
  );
}