import UserContext from '@/contexts/UserContext';

import { FC, MutableRefObject, useContext, useRef } from 'react';
import { z } from 'zod';
import { useRouter } from 'next/router';

import BeerStyleQueryResult from '@/services/posts/beer-style-post/schema/BeerStyleQueryResult';
import useBeerStyleComments from '@/hooks/data-fetching/beer-style-comments/useBeerStyleComments';
import {
  sendDeleteBeerStyleCommentRequest,
  sendEditBeerStyleCommentRequest,
} from '@/requests/comments/beer-style-comment';
import CommentLoadingComponent from '../Comments/CommentLoadingComponent';
import CommentsComponent from '../Comments/CommentsComponent';
import BeerStyleCommentForm from './BeerStyleCommentForm';

interface BeerStyleCommentsSectionProps {
  beerStyle: z.infer<typeof BeerStyleQueryResult>;
}

const BeerStyleCommentsSection: FC<BeerStyleCommentsSectionProps> = ({ beerStyle }) => {
  const { user } = useContext(UserContext);
  const router = useRouter();

  const pageNum = parseInt(router.query.comments_page as string, 10) || 1;
  const PAGE_SIZE = 15;

  const { comments, isLoading, mutate, setSize, size, isLoadingMore, isAtEnd } =
    useBeerStyleComments({ id: beerStyle.id, pageNum, pageSize: PAGE_SIZE });

  const commentSectionRef: MutableRefObject<HTMLDivElement | null> = useRef(null);

  return (
    <div className="w-full space-y-3" ref={commentSectionRef}>
      <div className="card bg-base-300">
        <div className="card-body h-full">
          {user ? (
            <BeerStyleCommentForm beerStyle={beerStyle} mutate={mutate} />
          ) : (
            <div className="flex h-52 flex-col items-center justify-center">
              <span className="text-lg font-bold">Log in to leave a comment.</span>
            </div>
          )}
        </div>
      </div>

      {
        /**
         * If the comments are loading, show a loading component. Otherwise, show the
         * comments.
         */
        isLoading ? (
          <div className="card bg-base-300 pb-6">
            <CommentLoadingComponent length={PAGE_SIZE} />
          </div>
        ) : (
          <CommentsComponent
            commentSectionRef={commentSectionRef}
            comments={comments}
            isLoadingMore={isLoadingMore}
            isAtEnd={isAtEnd}
            pageSize={PAGE_SIZE}
            setSize={setSize}
            size={size}
            mutate={mutate}
            handleDeleteCommentRequest={(id) => {
              return sendDeleteBeerStyleCommentRequest({
                beerStyleId: beerStyle.id,
                commentId: id,
              });
            }}
            handleEditCommentRequest={(id, data) => {
              return sendEditBeerStyleCommentRequest({
                beerStyleId: beerStyle.id,
                commentId: id,
                body: data,
              });
            }}
          />
        )
      }
    </div>
  );
};

export default BeerStyleCommentsSection;