From 81b75d3546b59018f9f93999b69506afae725fe9 Mon Sep 17 00:00:00 2001
From: James Shiffer <jshiffer@ucla.edu>
Date: Sun, 8 Oct 2023 18:59:04 -0700
Subject: [PATCH] Random messages

---
 discord/.env.example |  5 +++++
 discord/bot.ts       | 39 ++++++++++++++++++++++++++++++++++++++-
 2 files changed, 43 insertions(+), 1 deletion(-)

diff --git a/discord/.env.example b/discord/.env.example
index 6cccd4f..9962a74 100644
--- a/discord/.env.example
+++ b/discord/.env.example
@@ -1,3 +1,8 @@
 TOKEN="sadkfl;jasdkl;fj"
 REACTIONS="💀,💯,😭"
 GUILD="123456789012345678"
+
+ENABLE_MOTD=1
+MOTD_CHANNEL="123456789012345678"
+MOTD_HREF="https://fembooru.jp/post/list"
+MOTD_QUERY="#tips"
diff --git a/discord/bot.ts b/discord/bot.ts
index 73f85db..3f188f9 100644
--- a/discord/bot.ts
+++ b/discord/bot.ts
@@ -3,7 +3,16 @@
  * Scans the chat for reactions and updates the leaderboard database.
  */
 
-import { Client, Events, GatewayIntentBits, MessageReaction, PartialMessageReaction, Partials, User } from 'discord.js';
+import {
+    Client,
+    Events,
+    GatewayIntentBits,
+    MessageReaction,
+    PartialMessageReaction,
+    Partials,
+    TextChannel,
+    User
+} from 'discord.js';
 import { db, openDb, reactionEmojis, recordReaction, sync } from './util';
 
 const client = new Client({
@@ -46,6 +55,31 @@ async function onMessageReactionChanged(reaction: MessageReaction | PartialMessa
     await recordReaction(<MessageReaction> reaction);
 }
 
+async function fetchMotd()
+{
+    const res = await fetch(process.env.MOTD_HREF);
+    const xml = await res.text();
+    const parser = new DOMParser();
+    const doc = parser.parseFromString(xml, 'text/html');
+    return doc.querySelector(process.env.MOTD_QUERY).textContent;
+}
+
+async function scheduleRandomMessage(firstTime = false)
+{
+    if (!firstTime) {
+        const channel = <TextChannel> await client.channels.fetch(process.env.MOTD_CHANNEL);
+        const randomMessage = await fetchMotd();
+        await channel.send(randomMessage);
+        console.log(`[bot] Sent MOTD: ${randomMessage}`);
+    }
+    // wait between 2-8 hours
+    const timeoutMins = Math.random() * 360 + 120;
+    const scheduledTime = new Date();
+    scheduledTime.setMinutes(scheduledTime.getMinutes() + timeoutMins);
+    console.log(`[bot] Next MOTD: ${scheduledTime}`);
+    setTimeout(scheduleRandomMessage, timeoutMins * 60 * 1000);
+}
+
 client.on(Events.MessageReactionAdd, onMessageReactionChanged);
 client.on(Events.MessageReactionRemove, onMessageReactionChanged);
 
@@ -58,6 +92,9 @@ async function startup() {
     console.log("[bot] Logging in...");
     await client.login(process.env.TOKEN);
     await sync(client.guilds);
+    if (process.env.ENABLE_MOTD) {
+        await scheduleRandomMessage(true);
+    }
 }
 
 startup();