/**
 * Pagination Component
 * Navigate through pages of results
 */

'use client';

import { useRouter, useSearchParams, usePathname } from 'next/navigation';
import styles from './Pagination.module.css';

interface PaginationProps {
  currentPage: number;
  totalPages: number;
  total: number;
}

export function Pagination({ currentPage, totalPages, total }: PaginationProps) {
  const router = useRouter();
  const pathname = usePathname();
  const searchParams = useSearchParams();

  if (totalPages <= 1) return null;

  const goToPage = (page: number) => {
    const params = new URLSearchParams(searchParams);
    params.set('page', page.toString());
    router.push(`${pathname}?${params.toString()}`);
  };

  const handlePrevious = () => {
    if (currentPage > 1) {
      goToPage(currentPage - 1);
    }
  };

  const handleNext = () => {
    if (currentPage < totalPages) {
      goToPage(currentPage + 1);
    }
  };

  // Generate page numbers to show
  const getPageNumbers = () => {
    const pages: (number | string)[] = [];
    const maxVisible = 7;

    if (totalPages <= maxVisible) {
      // Show all pages
      for (let i = 1; i <= totalPages; i++) {
        pages.push(i);
      }
    } else {
      // Show first, last, and pages around current
      pages.push(1);

      if (currentPage > 3) {
        pages.push('...');
      }

      const start = Math.max(2, currentPage - 1);
      const end = Math.min(totalPages - 1, currentPage + 1);

      for (let i = start; i <= end; i++) {
        pages.push(i);
      }

      if (currentPage < totalPages - 2) {
        pages.push('...');
      }

      pages.push(totalPages);
    }

    return pages;
  };

  const pageNumbers = getPageNumbers();

  return (
    <div className={styles.pagination}>
      <div className={styles.info}>
        Showing page {currentPage} of {totalPages} ({total.toLocaleString()} total schools)
      </div>

      <div className={styles.controls}>
        <button
          onClick={handlePrevious}
          disabled={currentPage === 1}
          className={styles.navButton}
          aria-label="Previous page"
        >
          ← Previous
        </button>

        <div className={styles.pages}>
          {pageNumbers.map((page, index) => (
            typeof page === 'number' ? (
              <button
                key={index}
                onClick={() => goToPage(page)}
                className={page === currentPage ? styles.pageButtonActive : styles.pageButton}
                aria-label={`Go to page ${page}`}
                aria-current={page === currentPage ? 'page' : undefined}
              >
                {page}
              </button>
            ) : (
              <span key={index} className={styles.ellipsis}>
                {page}
              </span>
            )
          ))}
        </div>

        <button
          onClick={handleNext}
          disabled={currentPage === totalPages}
          className={styles.navButton}
          aria-label="Next page"
        >
          Next →
        </button>
      </div>
    </div>
  );
}