import React from 'react';
import { clsx } from 'clsx';
import { ChevronLeft, ChevronRight, ChevronsLeft, ChevronsRight } from 'lucide-react';
import Button from './Button';

export interface PaginationProps {
  currentPage: number;
  totalPages: number;
  onPageChange: (page: number) => void;
  pageSize?: number;
  totalItems?: number;
  showPageNumbers?: boolean;
  showFirstLast?: boolean;
  className?: string;
}

/**
 * Pagination component
 */
export const Pagination = ({
  currentPage,
  totalPages,
  onPageChange,
  pageSize,
  totalItems,
  showPageNumbers = true,
  showFirstLast = true,
  className,
}: PaginationProps) => {
  const getPageNumbers = () => {
    const delta = 2;
    const range = [];
    const rangeWithDots = [];

    for (
      let i = Math.max(2, currentPage - delta);
      i <= Math.min(totalPages - 1, currentPage + delta);
      i++
    ) {
      range.push(i);
    }

    if (currentPage - delta > 2) {
      rangeWithDots.push(1, '...');
    } else {
      rangeWithDots.push(1);
    }

    rangeWithDots.push(...range);

    if (currentPage + delta < totalPages - 1) {
      rangeWithDots.push('...', totalPages);
    } else {
      rangeWithDots.push(totalPages);
    }

    return rangeWithDots;
  };

  const pageNumbers = getPageNumbers();

  if (totalPages <= 1) return null;

  return (
    <div className={clsx('flex items-center justify-between gap-2', className)}>
      {/* Info */}
      {totalItems !== undefined && pageSize && (
        <div className="text-sm text-muted-foreground hidden sm:block">
          Showing {(currentPage - 1) * pageSize + 1} to{' '}
          {Math.min(currentPage * pageSize, totalItems)} of {totalItems} results
        </div>
      )}

      {/* Pagination Controls */}
      <div className="flex items-center gap-1">
        {showFirstLast && (
          <Button
            variant="outline"
            size="sm"
            onClick={() => onPageChange(1)}
            disabled={currentPage === 1}
            aria-label="First page"
          >
            <ChevronsLeft className="h-4 w-4" />
          </Button>
        )}

        <Button
          variant="outline"
          size="sm"
          onClick={() => onPageChange(currentPage - 1)}
          disabled={currentPage === 1}
          aria-label="Previous page"
        >
          <ChevronLeft className="h-4 w-4" />
        </Button>

        {showPageNumbers && (
          <div className="flex items-center gap-1">
            {pageNumbers.map((page, index) => {
              if (page === '...') {
                return (
                  <span
                    key={`ellipsis-${index}`}
                    className="px-3 py-2 text-sm text-muted-foreground"
                  >
                    ...
                  </span>
                );
              }

              const pageNum = page as number;
              const isActive = pageNum === currentPage;

              return (
                <Button
                  key={pageNum}
                  variant={isActive ? 'primary' : 'outline'}
                  size="sm"
                  onClick={() => onPageChange(pageNum)}
                  className={clsx('min-w-[2.5rem]', {
                    'pointer-events-none': isActive,
                  })}
                  aria-label={`Page ${pageNum}`}
                  aria-current={isActive ? 'page' : undefined}
                >
                  {pageNum}
                </Button>
              );
            })}
          </div>
        )}

        <Button
          variant="outline"
          size="sm"
          onClick={() => onPageChange(currentPage + 1)}
          disabled={currentPage === totalPages}
          aria-label="Next page"
        >
          <ChevronRight className="h-4 w-4" />
        </Button>

        {showFirstLast && (
          <Button
            variant="outline"
            size="sm"
            onClick={() => onPageChange(totalPages)}
            disabled={currentPage === totalPages}
            aria-label="Last page"
          >
            <ChevronsRight className="h-4 w-4" />
          </Button>
        )}
      </div>
    </div>
  );
};