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import { useState, useEffect, useLayoutEffect } from 'react';
import { Link, useLocation, useParams, Navigate } from 'react-router-dom';
import qs from 'qs';
import moment from 'moment';
import Message from './Message';
import Spinner from './Spinner';
import UserInfo from './UserInfo';
import { getMessages } from '../api';
/**
* @typedef {Object} Query
* @property {string} baseUrl
* @property {Object=} search
* @property {string} pageParam
*/
/**
* @typedef {Object} PageProps
* @property {string=} search
* @property {import('../api').SecureUser} visitor
* @property {import('../api').Message[]=} msgs
*/
function RequireAuth({ visitor, children }) {
let location = useLocation();
if (!visitor.hash) {
// Redirect them to the /login page, but save the current location they were
// trying to go to when they were redirected. This allows us to send them
// along to that page after they login, which is a nicer user experience
// than dropping them off on the home page.
return <Navigate to="/login" state={{ from: location }} />;
}
return children;
}
/**
* @param {PageProps} props
*/
export function Discover({ visitor }) {
const location = useLocation();
let search = qs.parse(location.search.substring(1));
const query = {
baseUrl: '/api/messages',
search: search,
pageParam: search.search ? 'page' : 'before_mid'
};
return (<Feed query={query} visitor={visitor} />);
}
/**
* @param {PageProps} props
*/
export function Discussions({ visitor }) {
const query = {
baseUrl: '/api/messages/discussions',
pageParam: 'to'
};
return (<Feed query={query} visitor={visitor} />);
}
/**
* @param {PageProps} props
*/
export function Blog({ visitor }) {
const { user } = useParams();
const location = useLocation();
const search = {
...qs.parse(location.search.substring(1)),
uname: user
};
const query = {
baseUrl: '/api/messages',
search: search,
pageParam: search.search ? 'page' : 'before_mid'
};
return (
<>
<div className="msg-cont">
<UserInfo uname={user} />
</div>
<Feed query={query} visitor={visitor} />
</>
);
}
/**
* @param {PageProps} props
*/
export function Tag({ visitor }) {
const params = useParams();
const { tag } = params;
const query = {
baseUrl: '/api/messages',
search: {
tag: tag
},
pageParam: 'before_mid'
};
return (<Feed query={query} visitor={visitor} />);
}
/**
* @param {PageProps} props
*/
export function Home({ visitor }) {
const query = {
baseUrl: '/api/home',
pageParam: 'before_mid'
};
return (
<RequireAuth visitor={visitor}>
<Feed query={query} visitor={visitor} />
</RequireAuth>
);
}
/**
* @typedef {Object} FeedState
* @property { import('../api').SecureUser } visitor
* @property { import('../api').Message[]= } msgs
* @property { Query} query
*/
/**
* @param {FeedState} props
*/
function Feed({ visitor, query }) {
const location = useLocation();
const [state, setState] = useState({
hash: visitor.hash,
msgs: [],
nextpage: null,
error: false,
tag: ''
});
const [loading, setLoading] = useState(true);
useEffect(() => {
setLoading(true);
const filter = location.search.substring(1);
let getPageParam = (pageParam, lastMessage, filterParams) => {
const pageValue = pageParam === 'before_mid' ? lastMessage.mid : pageParam === 'page' ? (Number(filterParams.page) || 0) + 1 : moment.utc(lastMessage.updated).valueOf();
let newFilter = { ...filterParams };
newFilter[pageParam] = pageValue;
return `?${qs.stringify(newFilter)}`;
};
const filterParams = qs.parse(filter);
let params = Object.assign({}, filterParams || {}, query.search || {});
let url = query.baseUrl;
getMessages(url, params)
.then(response => {
const { data } = response;
const { pageParam } = query;
const lastMessage = data.slice(-1)[0] || {};
const nextpage = getPageParam(pageParam, lastMessage, filterParams);
document.body.scrollTop = 0;
document.documentElement.scrollTop = 0;
setState((prevState) => {
return {
...prevState,
msgs: data,
nextpage: nextpage,
tag: qs.parse(location.search.substring(1))['tag'] || ''
};
});
setLoading(false);
}).catch(ex => {
setState((prevState) => {
return {
...prevState,
error: true
};
});
});
}, [location.search, query]);
return (state.msgs.length > 0 ? (
<div className="msgs">
{
state.tag && (
<p className="page">
<Link to={{ pathname: `/tag/${state.tag}` }}>
<span>← All posts with tag </span><b>{state.tag}</b>
</Link>
</p>
)
}
{
state.msgs.map(msg =>
<Message key={msg.mid} data={msg} visitor={visitor} />)
}
{
state.msgs.length >= 20 && (
<p className="page">
<Link to={{ pathname: location.pathname, search: state.nextpage }} rel="prev">Next →</Link>
</p>
)
}
</div>
) : state.error ? <div>error</div> : loading ? <div className="msgs"><Spinner /><Spinner /><Spinner /><Spinner /></div> : <div>No more messages</div>
);
}
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