import React, { useState, useEffect } from 'react';
import { Link } from 'react-router-dom';

import { info, fetchUserUri } from '../api';

import Avatar from './Avatar';
import Icon from './Icon';
import SearchBox from './SearchBox';

import './UserInfo.css';

let isMounted;

/**
 * Wrapper for dumb VSCode
 * @param {import('../api').User} user
 */
function useUserState(user) {
    return useState(user);
}

/**
 * User info component
 * @param {{user: string, onUpdate?: function, children?: Element}} props
 */
export default function UserInfo(props) {
    const [user, setUser] = useUserState({ uname: props.user, uid: 0 });
    const { onUpdate } = props;
    useEffect(() => {
        isMounted = true;
        if (!user.avatar) {
            info(user.uname).then(response => {
                if (isMounted) {
                    setUser(response.data);
                    onUpdate && onUpdate(response.data);
                }
            });
        }
        return () => {
            isMounted = false;
        };
    }, [onUpdate, user, user.avatar, setUser]);
    return (
        <>
            <div className="userinfo">
                <Avatar user={user}>
                    <div className="msg-ts">Was online recently</div>
                </Avatar>
            </div>
            <UserSummary user={user} />
            <div className="l">
                {
                    user.uid > 0 &&
                    <>
                        <Link to={`/pm/${user.uname}`}>
                            <Icon name="ei-envelope" size="s" />
                            <span className="desktop">PM</span>
                        </Link>
                        <Link to={`/${user.uname}/?show=recomm`} rel="nofollow">
                            <Icon name="ei-heart" size="s" />
                            <span className="desktop">Recommendations</span>
                        </Link>
                        <Link to={`/${user.uname}/?media=1`} rel="nofollow">
                            <Icon name="ei-camera" size="s" />
                            <span className="desktop">Photos</span>
                        </Link>
                    </>
                }
            </div>
            {props.children}
        </>
    );
}

/**
 * User summary component
 * @param {{user: import('../api').User}} props
 */
function Summary({ user }) {
    const readUrl = `/${user.uname}/friends`;
    const readersUrl = `/${user.uname}/readers`;
    const blUrl = `/${user.uname}/bl`;
    let read = user.read && <Link key={readUrl} to={readUrl}>I read: {user.read.length}</Link>;
    let readers = user.readers && <Link key={readersUrl} to={readersUrl}>My readers: {user.readers.length}</Link>;
    let mybl = user.statsMyBL && <Link key={blUrl} to={blUrl}>My blacklist: {user.statsMyBL}</Link>;
    let presentItems = [read, readers, mybl].filter(Boolean);
    return (
        <div className="msg-summary">
            {presentItems.length > 0 && presentItems.reduce((prev, curr) => [prev, ' ', curr])}
        </div>
    );
}

const UserSummary = React.memo(Summary);


/**
 * Link to user
 * @param {{ user: import('../api').User}} props
 */
export function UserLink(props) {
    const [user, setUser] = useState(props.user);
    useEffect(() => {
        isMounted = true;
        if (user.uri) {
            fetchUserUri(user.uri).then(response => {
                if (isMounted) {
                    setUser(response.data);
                }
            });
        }
        return () => {
            isMounted = false;
        };
    }, [user.uid, user.uri, setUser]);
    return (
        user.uid ?
            <Link key={user.uid} to={`/${user.uname}/`} className="info-avatar"><img src={user.avatar} />{user.uname}</Link>
            : <a href={user.uri} className="info-avatar"><img src={user.avatar} />{user.uname}</a>
    );
}