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import React, {useState, useEffect, useRef} from "react";
import {Route, Routes, useLocation, useNavigate} from "react-router-dom";
import Button from "components/button/Button.jsx";
import Submission from "components/submission/Submission.jsx";
import Post from "components/post/Post.jsx";
import {getSubreactFromLocation} from "helpers/Location.jsx";
import styles from "./Posts.css";
async function makePostsRequest(location, setPosts, setError, mounted) {
const init = {
method: "GET",
referrer: "same-origin",
}
const url = "/api/posts?" + new URLSearchParams({
page: 0,
amount: 25,
subreact: getSubreactFromLocation(location),
});
return fetch(url, init)
.then((response) => {
return response.json()
.catch(() => {
throw new Error("unexpected response from server")
})
})
.then((json) => {
if ("error" in json) {
throw new Error(json.error);
}
if (!mounted) {
return;
}
setPosts(json.posts);
})
.catch((error) => {
console.log(error);
if (!mounted) {
return;
}
setError(error.message);
});
}
function PostsError({navigate, error}) {
return (
<div className={styles.container + " " + styles.containerFade}>
<h1>Something's wrong!</h1>
<h2>Sorry, but an unexpected issue has forced us to stop early. Here are the technical details:</h2>
<h3>Error: {error}</h3>
<Button onClick={() => {navigate(0);}}>
Try again
</Button>
</div>
);
}
function PostsLoading() {
return (
<div className={styles.container + " " + styles.containerLoading}>
{[...Array(3)].map((_, i) =>
<Post placeholder key={i} />
)}
</div>
);
}
function PostsEmpty({navigate}) {
return (
<div className={styles.container + " " + styles.containerFade}>
<h1>There's nothing here?!?</h1>
<h2>Try changing subreacts.</h2>
<Button onClick={() => {navigate("/");}}>
Take me home
</Button>
</div>
);
}
function PostsStates({error, posts, navigate}) {
if (error !== null) { // Error message.
return (
<PostsError navigate={navigate} error={error} />
);
}
if (posts == null) {
return (
<PostsLoading />
)
}
if (posts.length == 0) {
return (
<PostsEmpty navigate={navigate} />
);
}
return (
posts.map(({uid, title, contents, time_updated, thumbnail, subreact}, i) =>
<Post key={i}
uid={uid}
title={title}
contents={contents}
timeUpdated={time_updated}
image={thumbnail}
subreact={subreact} />)
);
}
export default function Posts() {
const navigate = useNavigate();
const location = useLocation();
const locationRef = useRef(location);
const [posts, setPosts] = useState(null);
const [error, setError] = useState(null);
const [submissionActive, setSubmissionActive] = useState(false);
// We make a request if we're at the homepage or if we're changing subreacts.
const shouldMakeRequest = () => {
if (posts === null) {
return true;
}
const [previous, current] =
[locationRef.current, location].map((loc) => getSubreactFromLocation(loc));
return previous != current;
};
// This is a bit ugly, we're caching off our previous location so that we know
// if we should update or not.
useEffect(() => {
let mounted = true;
if (shouldMakeRequest()) {
setPosts(null);
makePostsRequest(location, setPosts, setError, mounted);
}
locationRef.current = location;
return () => {
setError(null);
mounted = false;
}
}, [location]);
return (
<div className={styles.container}>
<div className={styles.containerPadding}>
<div className={styles.postContainer + (submissionActive ? " " + styles.postContainerActive : "")}
onClick={(submissionActive ? () => {setSubmissionActive(false);} : null)}>
<div className={(submissionActive ? styles.blockEvents : "")}>
<PostsStates error={error} posts={posts} navigate={navigate}/>
</div>
</div>
</div>
<Submission active={submissionActive} setActive={setSubmissionActive} />
</div>
);
}
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