import { useToggle } from "@react-hookz/web";
import { useEffect, useRef, useState } from "react";
import { FaChevronDown, FaChevronUp } from "react-icons/fa";
import Button from "src/Components/Button/Button";
import { useAppSelector } from "src/utils/hooks";
import AddComment from "../AddComment/AddComment";
import CommentCard from "../CommentCard/CommentCard";
import { CommentWithReplies } from "../types";


interface Props {
    comment: CommentWithReplies
    isRoot?: boolean;
    canReply: boolean;
    onClickedReply?: () => void;
    onReply?: (text: string) => void
}

export default function Comment({ comment, canReply, isRoot, onClickedReply, onReply }: Props) {

    const [replyOpen, setReplyOpen] = useState(false);
    const [repliesCollapsed, toggleRepliesCollapsed] = useToggle(true)
    const [scrollToLatestReply, setScrollToLatestReply] = useState(true);
    const repliesContainer = useRef<HTMLDivElement>(null!)
    const user = useAppSelector(s => s.user.me);


    useEffect(() => {
        if (repliesCollapsed)
            setReplyOpen(false);
    }, [repliesCollapsed])

    useEffect(() => {
        if (scrollToLatestReply) {
            repliesContainer.current?.querySelector(`:scope > div:nth-child(${comment.replies.length})`)?.scrollIntoView({ behavior: 'smooth', block: "center" })
            setScrollToLatestReply(false);
        }
    }, [comment.replies.length, scrollToLatestReply])

    const clickReply = () => {
        if (isRoot)
            setReplyOpen(true);
        else
            onClickedReply?.()
    }

    const handleReply = async (text: string) => {
        try {
            await onReply?.(text);
            toggleRepliesCollapsed(false);
            setReplyOpen(false);
            setScrollToLatestReply(true)
            return true;
        } catch (error) {
            return false;
        }
    }

    return (
        <div >
            <CommentCard canReply={canReply} comment={comment} onReply={clickReply} />
            {(comment.replies.length > 0 || replyOpen) && <div className="flex mt-16 gap-8 md:gap-20 pl-8">
                <div className="border-l-2 border-b-2 border-gray-200 w-16 md:w-24 h-40 rounded-bl-8 flex-shrink-0"></div>
                <div className="flex flex-col w-full gap-16">
                    {comment.replies.length > 0 &&
                        <Button color="none" className="self-start mt-12 !px-0" onClick={() => toggleRepliesCollapsed()}>
                            {repliesCollapsed ?
                                <span className="text-gray-600"><span className="align-middle">Show {comment.replies.length} replies</span> <FaChevronDown className="ml-12" /></span>
                                :
                                <span className="text-gray-600"><span className="align-middle">Hide replies</span> <FaChevronUp className="ml-12" /> </span>
                            }
                        </Button>}
                    <div
                        className="flex flex-col gap-16 w-full"
                        ref={repliesContainer}
                    >
                        {!repliesCollapsed && comment.replies.map(reply => <Comment
                            key={reply.id}
                            comment={reply}
                            onClickedReply={clickReply}
                            canReply={!!isRoot}
                        />)}
                        {replyOpen && <AddComment
                            avatar={user?.avatar!}
                            autoFocus
                            placeholder="Leave a reply..."
                            onSubmit={handleReply}
                        />}
                    </div>
                </div>
            </div>}
        </div>
    )
}