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手動で index するのではなく、Queue (中身は Array) を使う #472

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Merged
KaichiManabe merged 2 commits into from
Dec 10, 2024
Merged

手動で index するのではなく、Queue (中身は Array) を使う #472

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9905f2c
stabilize
aster-void Oct 10, 2024
dbe8f69
merge main
aster-void Dec 10, 2024
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60 changes: 42 additions & 18 deletions web/app/home/page.tsx
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Original file line number Diff line number Diff line change
@@ -1,6 +1,7 @@
"use client";

import CloseIcon from "@mui/icons-material/Close";
import type { User } from "common/types";
import { motion, useAnimation } from "framer-motion";
import { useCallback, useEffect, useState } from "react";
import { MdThumbUp } from "react-icons/md";
Expand All @@ -12,26 +13,35 @@ import FullScreenCircularProgress from "~/components/common/FullScreenCircularPr
import { NavigateByAuthState } from "~/components/common/NavigateByAuthState";

export default function Home() {
const { data: recommended, error } = useRecommended();
const [nth, setNth] = useState<number>(0);
const displayedUser = recommended?.[nth];
const nextUser = recommended?.[nth + 1];
const { data, error } = useRecommended();
const controls = useAnimation();
const [clickedButton, setClickedButton] = useState<string>("");
const {
state: { data: myId },
} = useMyID();

const reject = useCallback(() => {
if (!displayedUser) return;
recommended?.push(displayedUser);
setNth((n) => n + 1);
}, [displayedUser, recommended]);
const [_, rerender] = useState({});
const [recommended, setRecommended] = useState<Queue<User>>(
() => new Queue([]),
);
useEffect(() => {
if (data) setRecommended(new Queue(data));
}, [data]);

const displayedUser = recommended.peek(1);
const nextUser = recommended.peek(2);
const reject = useCallback(() => {
const current = recommended.pop();
if (!current) return;
recommended.push(current);
rerender({});
}, [recommended]);
const accept = useCallback(async () => {
setNth((n) => n + 1);
if (displayedUser?.id) request.send(displayedUser.id);
}, [displayedUser?.id]);
const current = recommended.pop();
if (!current) return;
request.send(current.id);
rerender({});
}, [recommended]);

const onClickClose = useCallback(() => {
setClickedButton("cross");
Expand Down Expand Up @@ -61,12 +71,6 @@ export default function Home() {
});
}, [controls, accept]);

useEffect(() => {
if (!displayedUser) {
setNth(0);
}
}, [displayedUser]);

if (recommended == null) {
return <FullScreenCircularProgress />;
}
Expand Down Expand Up @@ -144,3 +148,23 @@ const CloseIconStyled = () => <CloseIcon className="text-4xl text-gray-500" />;
const FavoriteIconStyled = () => (
<MdThumbUp className="text-3xl text-primary" />
);

class Queue<T> {
private store: T[];
constructor(initial: T[]) {
this.store = initial;
}
push(top: T): void {
this.store.push(top);
}
// peek(1) to peek the next elem to be popped, peek(2) peeks the second next element to be popped.
peek(nth: number): T | undefined {
return this.store[nth - 1];
}
pop(): T | undefined {
return this.store.shift();
// yes, I know what you want to say, it has O(n) time complexity.
// it doesn't really matter if there is only like 100 people in home queue at most.
// if you really care about performance, why don't you go and limit the amount of people to fetch? that probably has significantly more impact to the performance.
}
}
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