import { ChevronLeft, ChevronRight } from 'lucide-react'
import { cn } from '@/lib/utils'

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

export function Pagination({ page, totalPages, total, pageSize, onPageChange }: PaginationProps) {
  const start = (page - 1) * pageSize + 1
  const end = Math.min(page * pageSize, total)

  const getPageNumbers = (): (number | 'ellipsis')[] => {
    if (totalPages <= 7) {
      return Array.from({ length: totalPages }, (_, i) => i + 1)
    }
    const pages: (number | 'ellipsis')[] = [1]
    if (page > 3) pages.push('ellipsis')
    for (let i = Math.max(2, page - 1); i <= Math.min(totalPages - 1, page + 1); i++) {
      pages.push(i)
    }
    if (page < totalPages - 2) pages.push('ellipsis')
    pages.push(totalPages)
    return pages
  }

  if (totalPages <= 1) return null

  const btnBase = cn(
    'inline-flex h-8 min-w-8 items-center justify-center rounded-md text-sm font-medium',
    'transition-colors disabled:opacity-50 disabled:pointer-events-none'
  )

  return (
    <div className="flex items-center justify-between gap-4 pt-4">
      <span className="text-sm text-muted-foreground">
        Showing {start}-{end} of {total}
      </span>
      <div className="flex items-center gap-1">
        <button
          onClick={() => onPageChange(page - 1)}
          disabled={page <= 1}
          className={cn(btnBase, 'px-2 text-muted-foreground hover:bg-elevated hover:text-foreground')}
        >
          <ChevronLeft className="h-4 w-4" />
        </button>
        {getPageNumbers().map((p, i) =>
          p === 'ellipsis' ? (
            <span key={`e${i}`} className="px-1 text-muted-foreground">...</span>
          ) : (
            <button
              key={p}
              onClick={() => onPageChange(p)}
              className={cn(
                btnBase,
                'px-2',
                p === page
                  ? 'bg-primary text-white'
                  : 'text-muted-foreground hover:bg-elevated hover:text-foreground'
              )}
            >
              {p}
            </button>
          )
        )}
        <button
          onClick={() => onPageChange(page + 1)}
          disabled={page >= totalPages}
          className={cn(btnBase, 'px-2 text-muted-foreground hover:bg-elevated hover:text-foreground')}
        >
          <ChevronRight className="h-4 w-4" />
        </button>
      </div>
    </div>
  )
}

export default Pagination