"use client";

import "./ReviewSection.scss";
import { apiInstance } from "@/shared/config/apiConfig";
import { IReviewList } from "@/shared/types/review-type";
import { signIn, useSession } from "next-auth/react";
import { useEffect, useRef, useState } from "react";
import calendar from "./icons/calendar.svg";
import Image from "next/image";
import {
  Link,
  usePathname,
  useRouter,
} from "@/shared/config/navigation";
import Loader from "@/shared/ui/components/Loader/Loader";

interface IReviewsSectionProps {
  endpoint: string;
  id: number;
}

const ReviewSection: React.FC<IReviewsSectionProps> = ({
  endpoint,
  id,
}: IReviewsSectionProps) => {
  const lastElement = useRef<HTMLDivElement | null>(null);
  const observer = useRef<IntersectionObserver | null>(null);
  const [reviews, setReviews] = useState<IReviewList>({
    count: 0,
    next: null,
    previous: null,
    results: [
      {
        id: 0,
        author: {
          image: "",
          id: 0,
          first_name: "",
          last_name: "",
          govern_status: null,
        },
        review: "",
        created_at: "",
      },
    ],
  });
  const [pageSize, setPageSize] = useState<number>(8);
  const [reviewCount, setReviewCount] = useState<number>(0);
  const [loader, setLoader] = useState<boolean>(false);
  const pathname = usePathname();
  const session = useSession();
  const handleSubmit: React.MouseEventHandler<
    HTMLFormElement
  > = async (e) => {
    e.preventDefault();
    const Authorization = `Bearer ${session.data?.access_token}`;

    const formData = new FormData(e.currentTarget);

    const config = {
      headers: {
        Authorization,
      },
    };

    if (session.status === "unauthenticated") {
      signIn(undefined, { callbackUrl: pathname });
    }

    if (!formData.get("review")) {
      return;
    }

    formData.append("news", id.toString());

    try {
      const res = await apiInstance.post(
        `/${endpoint}/${id}/reviews/`,
        formData,
        config
      );

      getReviews();
    } catch (error) {
      console.log(error);
    }
  };

  const getReviews = async () => {
    setLoader(true);
    const response = await apiInstance.get<IReviewList>(
      `/${endpoint}/${id}/reviews/?page_size=${pageSize}`
    );

    setReviewCount(response.data.count);
    setLoader(false);
    setReviews({
      count: response.data.count,
      next: response.data.next,
      previous: response.data.previous,
      results: [...reviews?.results, ...response.data.results],
    });
    setReviews(response?.data);
  };

  useEffect(() => {
    if (loader) return;
    if (observer.current) observer.current.disconnect();
    const callback = function (entries: any) {
      if (
        entries[0].isIntersecting &&
        (reviews?.results.length as number) <= reviewCount
      ) {
        if (pageSize < reviewCount) {
          setPageSize((prev) => prev + 8);
        } else {
          setPageSize(reviewCount);
        }
      }
    };
    observer.current = new IntersectionObserver(callback);
    observer.current.observe(lastElement.current as HTMLDivElement);
  }, [loader]);

  useEffect(() => {
    getReviews();
  }, [pageSize]);

  const months: Record<string, string> = {
    "01": "Январь",
    "02": "Февраль",
    "03": "Март",
    "04": "Апрель",
    "05": "Май",
    "06": "Июнь",
    "07": "Июль",
    "08": "Август",
    "09": "Сентябрь",
    "10": "Октябрь",
    "11": "Ноябрь",
    "12": "Декабрь",
  };

  return (
    <section className="review-section">
      <h3>
        <span id="blue-point" /> Написать комментарий
      </h3>

      {session.status === "authenticated" ? (
        <form onSubmit={handleSubmit}>
          <textarea name="review" />
          <button type="submit">Отправить</button>
        </form>
      ) : (
        <p className="review-section__auth-warning">
          Перед тем как оставить комментарий, пожалуйста
          <button
            onClick={() =>
              signIn(undefined, { callbackUrl: pathname })
            }
          >
            войдите в аккаунт
          </button>
        </p>
      )}

      <div className="review-section__list">
        <h3>
          <span id="blue-point" /> Комментарии
        </h3>

        {reviews?.results.length !== 0 ? (
          <ul key="unuqie key">
            {reviews?.results.map((review) => (
              <li key={review.id} className="review">
                <div className="review__author">
                  <img
                    id="author-img"
                    src={review.author.image}
                    alt="Author Image"
                  />
                  <div className="review__header">
                    <h5 className="review__author-name">
                      {review.author.first_name}{" "}
                      {review.author.last_name}
                    </h5>
                    <div className="review__date">
                      <Image src={calendar} alt="Calendar Icon" />
                      <p>
                        {months[review.created_at.slice(5, 7)]}{" "}
                        {review.created_at.slice(5, 7).slice(0, 1) ===
                        "0"
                          ? review.created_at.slice(6, 7)
                          : review.created_at.slice(5, 7)}
                        , {review.created_at.slice(0, 4)}
                      </p>
                    </div>
                  </div>
                </div>
                <p className="review__description">{review.review}</p>
              </li>
            ))}
          </ul>
        ) : (
          <p className="review-section__warning">
            Оставьте комментарий первым :)
          </p>
        )}
        {loader ? (
          <div className="review-section__loader">
            <Loader color="#000" />
          </div>
        ) : null}
        <div
          ref={lastElement}
          className="review-section__list_bottom"
        ></div>
      </div>
    </section>
  );
};

export default ReviewSection;