FollowCollectionButton.js

/*Copyright (C) 2019 Centro de Computacao Cientifica e Software Livre
Departamento de Informatica - Universidade Federal do Parana

This file is part of Plataforma Integrada MEC.

Plataforma Integrada MEC is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

Plataforma Integrada MEC is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU Affero General Public License for more details.

You should have received a copy of the GNU Affero General Public License
along with Plataforma Integrada MEC.  If not, see <http://www.gnu.org/licenses/>.*/

import React, { useState, useEffect } from 'react';
import Button from '@material-ui/core/Button';
import CheckIcon from '@material-ui/icons/Check';
import AddIcon from '@material-ui/icons/Add';
import styled from 'styled-components';
import SignUpModal from './SignUpModal.js';
import axios from 'axios';
import {apiUrl} from '../env';

export default function FollowCollectionButton(props) {
	const [icon, setIcon] = useState(<AddIcon fontSize="large"/>);
	const [button_text, setButtonText] = useState("Seguir Coleção");
	const [variant, setVariant] = useState("outlined");
	const [sign_up_open, setSignUpOpen] = useState(false);
	const [following, setFollowing] = useState(false); //user following collection

	useEffect(() => {
		axios.get(apiUrl+'/users/'+props.user_id+'/following/Collection')
		.then(res => {
			for (const element in res.body)
				if (element.id == props.collection_id)
					setFollowing(true);
		});
	}, [])

	//handleMouse{Enter, Leave} only do anything when user follows given collection:
	const handleMouseEnter = () => {
		if (following) {
			setVariant("outlined");
			setButtonText("Deixar de seguir");
			setIcon(null);
		}
	}
	
	const handleMouseLeave = () => {
		if (following) {
			setVariant("contained");
			setButtonText("Seguindo");
			setIcon(<CheckIcon fontSize="large" />);
		}
	}

	const handleClick = () => {
		if (!props.user_id)
			setSignUpOpen(true);
		else if (!following) {
			setVariant("contained");
			setButtonText("Seguindo");
			setIcon(<CheckIcon fontSize="large"/>)
			setFollowing(true);
			axios.post(apiUrl+'/collections/'+props.collection_id+'/follow')
				.then(res => {
					if (Number(res.status) != 201)
						setFollowing(false);
						setIcon(<AddIcon fontSize="large"/>);
						setButtonText("Seguindo");
						setVariant("contained");
				});
		} else {
			setVariant("outlined");
			setButtonText("Deixar de seguir");
			setIcon(<AddIcon fontSize="large"/>);
			setFollowing(false);
			axios.delete(apiUrl+'/collections/'+props.collection_id+'/follow')
				.then(res => {
					if (Number(res.status) == 200)
						setFollowing(true);
						setIcon(<CheckIcon fontSize="large"/>);
						setButtonText("Deixar de seguir");
						setVariant("outlined");
				});
		}
	};

	if (props.user_is_owner)
		return (
			<div>
				<FollowButton
					variant={variant}
					color="primary"
					startIcon={icon}
					size="large"
					onMouseEnter={handleMouseEnter}
					onMouseLeave={handleMouseLeave}
					onClick={handleClick}
				>
					<ButtonText>{button_text}</ButtonText>
				</FollowButton>
				<SignUpModal open={sign_up_open} handleClose={() => setSignUpOpen(false)} />
			</div>
		);
		else return (<div></div>);
}

const Title=styled.h1`
	font-size: 3em;
	color: rgb(102, 102, 102);
	float: left;
`
const ButtonText=styled.span`
	font-weight: bolder;
	font-size: 1.2em;
`
const FollowButton=styled(Button)`
	padding-left: 10;
	padding-right: 10;
	width: 250px;
`