import { useCallback, useMemo } from 'react';
import { Button as AriaButton } from 'react-aria-components';

type PaginationProps = {
  totalPages: number;
  currentPage: number;
  pageCount?: number;
  onPageChange: (page: number) => void;
};

// https://design-system.w3.org/components/pagination.html
export const Pagination = ({ totalPages, currentPage, pageCount = 10, onPageChange }: PaginationProps) => {
  const start = useMemo(() => {
    return Math.floor(currentPage / pageCount) * pageCount;
  }, [currentPage, pageCount]);

  const handlePageClick = useCallback(
    (page: number) => () => {
      if (typeof onPageChange === 'function' && page >= 0 && page < totalPages) {
        onPageChange(page);
      }
    },
    [totalPages, onPageChange],
  );

  const pageArray = useMemo(() => {
    const arr: number[] = [];

    // totalPage가 0이면 아무것도 안나와서 최소 1이 되도록 수정
    const _totalPages = totalPages > 0 ? totalPages : 1;
    if (Number.isNaN(start)) {
      return arr;
    }

    for (let i = 0; i < pageCount; i++) {
      const pageNumber = start + i;

      if (pageNumber >= _totalPages) {
        continue;
      }

      arr.push(pageNumber);
    }

    return arr;
  }, [start, pageCount, totalPages]);

  const noPrev = start === 0;
  const noNext = start + pageCount >= totalPages;

  return (
    <nav className="text-kc-gray-99 text-sm" aria-label="pagination">
      <ul className="flex items-center justify-center list-none">
        <li className="flex">
          <AriaButton
            className="cursor-pointer data-[disabled=true]:cursor-default"
            isDisabled={noPrev}
            aria-label="첫 페이지"
            onClick={handlePageClick(0)}
          >
            <svg width="40" height="40" viewBox="0 0 40 40" fill="none" xmlns="http://www.w3.org/2000/svg">
              <rect x="15.8571" y="15" width="1.5" height="10" fill="currentColor" />
              <path d="M24.1429 15.3571L19.1429 19.8571L24.1429 24.3571" stroke="currentColor" strokeWidth="1.5" />
            </svg>
          </AriaButton>
        </li>
        <li className="mr-2.5 flex">
          <AriaButton
            className="cursor-pointer data-[disabled=true]:cursor-default"
            isDisabled={noPrev}
            aria-label="이전 페이지"
            onClick={handlePageClick(start - 1)}
          >
            <svg width="40" height="40" viewBox="0 0 40 40" fill="none" xmlns="http://www.w3.org/2000/svg">
              <path d="M22.5 15.5L17.5 20L22.5 24.5" stroke="currentColor" strokeWidth="1.5" />
            </svg>
          </AriaButton>
        </li>
        {pageArray.map((pageNumber) => (
          <li key={pageNumber}>
            <AriaButton
              isDisabled={currentPage === pageNumber}
              className="w-10 h-10 flex items-center justify-center tabular-nums not-disabled:cursor-pointer aria-[current=page]:text-sm aria-[current=page]:text-primary aria-[current=page]:font-bold"
              onClick={handlePageClick(pageNumber)}
              aria-current={currentPage === pageNumber ? 'page' : undefined}
            >
              {pageNumber + 1}
            </AriaButton>
          </li>
        ))}
        <li className="ml-2.5 flex">
          <AriaButton
            isDisabled={noNext}
            className="cursor-pointer data-[disabled=true]:cursor-default"
            // className="text-[#CCCCCC]"
            aria-label="다음 페이지"
            onClick={handlePageClick(start + pageCount)}
          >
            <svg width="40" height="40" viewBox="0 0 40 40" fill="none" xmlns="http://www.w3.org/2000/svg">
              <path d="M17.5 15.5L22.5 20L17.5 24.5" stroke="currentColor" strokeWidth="1.5" />
            </svg>
          </AriaButton>
        </li>
        <li className="flex">
          <AriaButton
            isDisabled={noNext}
            className="cursor-pointer data-[disabled=true]:cursor-default"
            // className="text-[#CCCCCC]"
            aria-label="마지막 페이지"
            onClick={handlePageClick(totalPages - 1)}
          >
            <svg width="40" height="40" viewBox="0 0 40 40" fill="none" xmlns="http://www.w3.org/2000/svg">
              <path d="M15.75 15.5L20.75 20L15.75 24.5" stroke="currentColor" strokeWidth="1.5" />
              <path d="M24.25 15H22.75V25H24.25V15Z" fill="currentColor" />
            </svg>
          </AriaButton>
        </li>
      </ul>
    </nav>
  );
};
