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import Alert from "components/Alert";
import Button from "components/Button";
import CenteredSpinner from "components/CenteredSpinner/CenteredSpinner";
import StyledLink from "components/StyledLink";
import {
useCommunity,
useListSubCommunities,
} from "features/communities/hooks";
import { useTranslation } from "i18n";
import { DASHBOARD } from "i18n/namespaces";
import { Community } from "proto/communities_pb";
import { useEffect, useRef, useState } from "react";
import { routeToCommunity } from "routes";
import makeStyles from "utils/makeStyles";
const useStyles = makeStyles((theme) => ({
root: {
display: "flex",
flexDirection: "row",
alignItems: "flex-start",
"& > * + *": {
marginInlineStart: theme.spacing(2),
},
},
list: {
minWidth: "10rem",
},
loader: {
margin: theme.spacing("auto", 2),
},
selected: {
fontWeight: "bold",
},
emptyState: {
color: theme.palette.grey[600],
},
}));
export default function CommunityBrowser() {
const { t } = useTranslation([DASHBOARD]);
const classes = useStyles();
const [selected, setSelected] = useState<Community.AsObject[]>([]);
const globalCommunityQuery = useCommunity(1);
//react-query doesn't have useInfiniteQueries
//as a workaround, cache query results
//and only show "Load more" for last column
const query = useListSubCommunities(
selected?.[selected.length - 1]?.communityId || 1
);
const [cachedQueryResults, setCachedQueryResults] = useState<
{
data: Community.AsObject[];
hasMore?: boolean;
}[]
>([]);
const lastColumnRef = useRef<HTMLDivElement>(null);
useEffect(() => {
setTimeout(
() =>
lastColumnRef.current?.scrollIntoView({
behavior: "smooth",
inline: "end",
}),
50
);
}, [selected]);
const handleClick = (community: Community.AsObject, level: number) => {
//if the last column is clicked
if (level === selected.length) {
setCachedQueryResults([
...cachedQueryResults,
{
data: query.data!.pages.flatMap((page) => page.communitiesList),
hasMore: query.hasNextPage,
},
]);
setSelected([...selected.slice(0, level), community]);
} else {
if (community.communityId === selected[level].communityId) {
//a previously selected item is clicked, so unselect it
//treat level = 0 as a special case
if (level === 0) {
setSelected([]);
} else {
setSelected([...selected.slice(0, level)]);
}
setCachedQueryResults(cachedQueryResults.slice(0, level));
} else {
//a previously unselected item is clicked
setSelected([...selected.slice(0, Math.max(level, 0)), community]);
setCachedQueryResults(cachedQueryResults.slice(0, level + 1));
}
}
};
return (
<div className={classes.root}>
{cachedQueryResults.map((query, index) => (
<BrowserColumn
key={index}
parent={selected?.[index - 1] ?? globalCommunityQuery.data}
communities={query.data}
handleClick={(community) => handleClick(community, index)}
selected={selected[index]?.communityId}
/>
))}
{query.isLoading ? ( // div prevents overflow scrollbar from spinner
<div className={classes.loader}>
<CenteredSpinner />
</div>
) : query.isSuccess && globalCommunityQuery.isSuccess ? (
<div ref={lastColumnRef}>
<BrowserColumn
parent={
selected?.[selected.length - 1] ?? globalCommunityQuery.data
}
communities={query.data.pages.flatMap(
(page) => page.communitiesList
)}
handleClick={(community) => handleClick(community, selected.length)}
/>
{query.hasNextPage && (
<Button
onClick={() => query.fetchNextPage()}
loading={query.isFetchingNextPage}
variant="outlined"
>
{t("dashboard:load_more")}
</Button>
)}
</div>
) : (
<Alert severity="error">{query?.error?.message || ""}</Alert>
)}
</div>
);
}
function BrowserColumn({
parent,
communities,
handleClick,
selected,
}: {
parent?: Community.AsObject;
communities: Community.AsObject[];
handleClick: (community: Community.AsObject) => void;
selected?: number;
}) {
const { t } = useTranslation([DASHBOARD]);
const classes = useStyles();
return (
<List className={classes.list}>
{parent && (
<>
<ListItem
component={StyledLink}
href={routeToCommunity(parent.communityId, parent.slug)}
>
{parent.name}
</ListItem>
<Divider />
</>
)}
{communities.length === 0 ? (
<ListItem>
<ListItemText
primaryTypographyProps={{
className: classes.emptyState,
variant: "body2",
}}
>
{t("dashboard:no_sub_communities")}
</ListItemText>
</ListItem>
) : (
communities.map((community) => (
<ListItem
key={community.communityId}
component="button"
onClick={() => handleClick(community)}
aria-selected={community.communityId === selected}
sx={{
background: "transparent",
border: "none",
"&:hover": {
background: "#3135390A",
},
}}
>
<ListItemText
primaryTypographyProps={{
className:
community.communityId === selected
? classes.selected
: undefined,
}}
>
{community.name}
</ListItemText>
</ListItem>
))
)}
</List>
);
}
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