AtCoder Standings Watcher

Watch standings and notifies
As of 2021-07-03. See the latest version.
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// ==UserScript==
// @name         AtCoder Standings Watcher
// @namespace    https://atcoder.jp/
// @version      0.2.1
// @description  Watch standings and notifies
// @author       magurofly
// @match        https://atcoder.jp/contests/*
// @icon         https://www.google.com/s2/favicons?domain=atcoder.jp
// @grant        GM_setValue
// @grant        GM_getValue
// @grant        GM_notification
// @grant        unsafeWindow
// ==/UserScript==
 
(function() {
    'use strict';
 
    // 各種設定
    const INTERVAL = 10.0e3; // 更新間隔（ミリ秒単位）
    const NOTIFICATION_TIMEOUT = 10;
    const NOTIFICATION_TEMPLATES = {
        penalty: ({user, task}) => `${user.id} さんが ${task.assignment} - ${task.name} でペナルティを出しました`,
        accepted: ({user, task, score}) => `${user.id} さんが ${task.assignment} - ${task.name} で ${score} 点を獲得しました`,
    };
 
    // 定数
    const watchingContest = unsafeWindow.contestScreenName;
    const standingsAPI = `/contests/${watchingContest}/standings/json`;
    const channel = new BroadcastChannel("atcoder-standings-watcher");
 
    // 状態
    let lastUpdate = 0; // 最後に更新した時刻
    const watchingUsers = {};
 
    // 関数
    async function initialize() {
        channel.onmessage = (notification) => {
            switch (notification.type) {
                case "update":
                    if (notification.contest == watchingContest) lastUpdate = Math.max(lastUpdate, notification.time);
                    break;
                case "task":
                    watchingUsers[notification.userId].taskResults[notification.taskId] = notification.result;
                    break
            }
        };
 
        setTimeout(() => {
            update(true);
            setInterval(() => {
                const now = Date.now();
                if (now - lastUpdate <= INTERVAL) return; // INTERVAL 以内に更新していた場合、今回は見送る
                lastUpdate = now;
                channel.postMessage({ type: "update", contest: watchingContest, time: lastUpdate });
                update();
            }, INTERVAL);
        }, INTERVAL);
 
        const favs = await getFavs();
        for (const fav of favs) {
            watchingUsers[fav] = {
                id: fav,
                rank: 0,
                taskResults: {},
            };
        }
    }
 
    async function update(ignore = false) {
        console.info("AtCoder Standings Watcher: update");
        const data = await getStandingsData();
        const tasks = {};
        for (const {TaskScreenName, Assignment, TaskName} of data.TaskInfo) {
            tasks[TaskScreenName] = { id: TaskScreenName, assignment: Assignment, name: TaskName };
        }
        for (const standing of data.StandingsData) {
            const userId = standing.UserScreenName;
            if (!(userId in watchingUsers)) continue;
            const user = watchingUsers[userId];
 
            if (standing.Rank != user.rank) {
                user.rank = standing.Rank;
            }
            for (const task in standing.TaskResults) {
                const result = user[task] || (user[task] = { count: 0, penalty: 0, score: 0 });
                const Result = standing.TaskResults[task];
                if (Result.Penalty > result.penalty) {
                    result.penalty = Result.Penalty;
                    if (!ignore) notify({ user, task: tasks[task], type: "penalty" });
                }
                if (Result.Score > result.score) {
                    result.score = Result.Score;
                    if (!ignore) notify({ user, task: tasks[task], type: "accepted", score: result.score / 100 });
                }
            }
        }
    }
 
    function notify(notification) {
        if (notification.user && notification.task) {
            channel.postMessage({ type: "task", userId: notification.user.id, taskId: notification.task.id, result: notification.user.taskResults[notification.task.id] });
        }
        GM_notification({
            text: NOTIFICATION_TEMPLATES[notification.type](notification),
            timeout: NOTIFICATION_TIMEOUT,
        }, null);
    }
 
    async function getFavs() {
        while (!unsafeWindow.favSet) {
            unsafeWindow.reloadFavs();
            await sleep(100);
        }
        return unsafeWindow.favSet;
    }
 
    async function getStandingsData() {
        return await fetch(standingsAPI).then(response => response.json());
    }
 
    const sleep = (ms) => new Promise(done => setInterval(done, ms));
 
    // 初期化
    initialize();
})();