import { useContext } from 'react'
import { ChevronLeft, ChevronRight, ChevronsLeft, ChevronsRight } from 'lucide-react'
import { LocaleContext } from '../context/LocaleContext'
import styles from './Pagination.module.css'

export interface PaginationProps {
  currentPage: number
  totalPages: number
  onPageChange: (page: number) => void
  ariaLabel?: string
  /** Pages on each side of current. Default 3 → e.g. 1 2 3 [4] 5 6 7 */
  siblingCount?: number
  disabled?: boolean
  /** `inline` for table footers (no top margin). */
  variant?: 'default' | 'inline'
  className?: string
}

function buildPageWindow(
  currentPage: number,
  totalPages: number,
  siblingCount: number,
): number[] {
  const start = Math.max(1, currentPage - siblingCount)
  const end = Math.min(totalPages, currentPage + siblingCount)
  const pages: number[] = []
  for (let page = start; page <= end; page += 1) {
    pages.push(page)
  }
  return pages
}

export function Pagination({
  currentPage,
  totalPages,
  onPageChange,
  ariaLabel = 'Pagination',
  siblingCount = 3,
  disabled = false,
  variant = 'default',
  className,
}: PaginationProps) {
  const locale = useContext(LocaleContext)
  const dir =
    locale?.dir ??
    (typeof document !== 'undefined' && document.documentElement.dir === 'rtl' ? 'rtl' : 'ltr')
  const isRtl = dir === 'rtl'

  if (totalPages <= 1) return null

  const pages = buildPageWindow(currentPage, totalPages, siblingCount)
  const rootClass = [
    styles.pagination,
    variant === 'inline' ? styles.paginationInline : '',
    className ?? '',
  ]
    .filter(Boolean)
    .join(' ')

  const FirstIcon = isRtl ? ChevronsRight : ChevronsLeft
  const PrevIcon = isRtl ? ChevronRight : ChevronLeft
  const NextIcon = isRtl ? ChevronLeft : ChevronRight
  const LastIcon = isRtl ? ChevronsLeft : ChevronsRight

  return (
    <nav className={rootClass} aria-label={ariaLabel} dir={dir}>
      <button
        type="button"
        className={styles.navBtn}
        onClick={() => onPageChange(1)}
        disabled={disabled || currentPage === 1}
        aria-label="First page"
      >
        <FirstIcon size={18} />
      </button>

      <button
        type="button"
        className={styles.navBtn}
        onClick={() => onPageChange(currentPage - 1)}
        disabled={disabled || currentPage === 1}
        aria-label="Previous page"
      >
        <PrevIcon size={18} />
      </button>

      <div className={styles.pages}>
        {pages.map((page) => (
          <button
            key={page}
            type="button"
            className={`${styles.pageBtn} ${page === currentPage ? styles.active : ''}`}
            onClick={() => onPageChange(page)}
            disabled={disabled}
            aria-label={`Page ${page}`}
            aria-current={page === currentPage ? 'page' : undefined}
          >
            {page}
          </button>
        ))}
      </div>

      <button
        type="button"
        className={styles.navBtn}
        onClick={() => onPageChange(currentPage + 1)}
        disabled={disabled || currentPage === totalPages}
        aria-label="Next page"
      >
        <NextIcon size={18} />
      </button>

      <button
        type="button"
        className={styles.navBtn}
        onClick={() => onPageChange(totalPages)}
        disabled={disabled || currentPage === totalPages}
        aria-label="Last page"
      >
        <LastIcon size={18} />
      </button>
    </nav>
  )
}