'use client';

import { useState } from 'react';
import { usePathname } from 'next/navigation';
import { formatDate } from 'pliny/utils/formatDate';
import { CoreContent } from 'pliny/utils/contentlayer';
import type { Blog } from 'contentlayer/generated';
import Link from '@/components/Link';
import Tag from '@/components/Tag';
import siteMetadata from '@/data/siteMetadata';

interface PaginationProps {
  totalPages: number;
  currentPage: number;
}
interface ListLayoutProps {
  posts: CoreContent<Blog>[];
  title: string;
  initialDisplayPosts?: CoreContent<Blog>[];
  pagination?: PaginationProps;
}

function Pagination({ totalPages, currentPage }: PaginationProps) {
  const pathname = usePathname();
  const basePath = pathname.split('/')[1];
  const prevPage = currentPage - 1 > 0;
  const nextPage = currentPage + 1 <= totalPages;

  return (
    <div className="space-y-2 pb-8 pt-6 md:space-y-5">
      <nav className="flex justify-between">
        {!prevPage && (
          <button
            className="cursor-auto disabled:opacity-50"
            disabled={!prevPage}>
            Previous
          </button>
        )}
        {prevPage && (
          <Link
            href={
              currentPage - 1 === 1
                ? `/${basePath}/`
                : `/${basePath}/page/${currentPage - 1}`
            }
            rel="prev">
            Previous
          </Link>
        )}
        <span>
          {currentPage} of {totalPages}
        </span>
        {!nextPage && (
          <button
            className="cursor-auto disabled:opacity-50"
            disabled={!nextPage}>
            Next
          </button>
        )}
        {nextPage && (
          <Link href={`/${basePath}/page/${currentPage + 1}`} rel="next">
            Next
          </Link>
        )}
      </nav>
    </div>
  );
}

export default function ListLayout({
  posts,
  title,
  initialDisplayPosts = [],
  pagination,
}: ListLayoutProps) {
  const [searchValue, setSearchValue] = useState('');
  const filteredBlogPosts = posts.filter((post) => {
    const searchContent = post.title + post.summary + post.tags?.join(' ');
    return searchContent.toLowerCase().includes(searchValue.toLowerCase());
  });

  // If initialDisplayPosts exist, display it if no searchValue is specified
  const displayPosts =
    initialDisplayPosts.length > 0 && !searchValue
      ? initialDisplayPosts
      : filteredBlogPosts;

  return (
    <>
      <div className="divide-y divide-gray-200 dark:divide-gray-700">
        <div className="space-y-2 pb-8 pt-6 md:space-y-5">
          <h1 className="text-3xl font-extrabold leading-9 tracking-tight text-gray-900 dark:text-gray-100 sm:text-4xl sm:leading-10 md:text-6xl md:leading-14">
            {title}
          </h1>
          <div className="relative max-w-lg">
            <label>
              <span className="sr-only">Search articles</span>
              <input
                aria-label="Search articles"
                type="text"
                onChange={(e) => setSearchValue(e.target.value)}
                placeholder="Search articles"
                className="block w-full rounded-md border border-gray-300 bg-white px-4 py-2 text-gray-900 focus:border-primary-500 focus:ring-primary-500 dark:border-gray-900 dark:bg-gray-800 dark:text-gray-100"
              />
            </label>
            <svg
              className="absolute right-3 top-3 h-5 w-5 text-gray-400 dark:text-gray-300"
              xmlns="http://www.w3.org/2000/svg"
              fill="none"
              viewBox="0 0 24 24"
              stroke="currentColor">
              <path
                strokeLinecap="round"
                strokeLinejoin="round"
                strokeWidth={2}
                d="M21 21l-6-6m2-5a7 7 0 11-14 0 7 7 0 0114 0z"
              />
            </svg>
          </div>
        </div>
        <ul>
          {!filteredBlogPosts.length && 'No posts found.'}
          {displayPosts.map((post) => {
            const { path, date, title, summary, tags } = post;
            return (
              <li key={path} className="py-4">
                <article className="space-y-2 xl:grid xl:grid-cols-4 xl:items-baseline xl:space-y-0">
                  <dl>
                    <dt className="sr-only">Published on</dt>
                    <dd className="text-base font-medium leading-6 text-gray-500 dark:text-gray-400">
                      <time dateTime={date}>
                        {formatDate(date, siteMetadata.locale)}
                      </time>
                    </dd>
                  </dl>
                  <div className="space-y-3 xl:col-span-3">
                    <div>
                      <h3 className="text-2xl font-bold leading-8 tracking-tight">
                        <Link
                          href={`/${path}`}
                          className="text-gray-900 dark:text-gray-100">
                          {title}
                        </Link>
                      </h3>
                      <div className="flex flex-wrap">
                        {tags?.map((tag) => <Tag key={tag} text={tag} />)}
                      </div>
                    </div>
                    <div className="prose max-w-none text-gray-500 dark:text-gray-400">
                      {summary}
                    </div>
                  </div>
                </article>
              </li>
            );
          })}
        </ul>
      </div>
      {pagination && pagination.totalPages > 1 && !searchValue && (
        <Pagination
          currentPage={pagination.currentPage}
          totalPages={pagination.totalPages}
        />
      )}
    </>
  );
}