From 33f880f4b1e7402212c556f0fd777b1f54784f73 Mon Sep 17 00:00:00 2001
From: Michael Peters <michael@copium>
Date: Tue, 8 Feb 2022 22:43:56 -0600
Subject: [PATCH] jump to bottom

---
 src/.prettierrc.json                          |  2 +-
 .../elements/components/infinite-scroll.tsx   |  8 ++--
 .../webapp/elements/lists/message-list.tsx    | 46 +++++++++++++++----
 3 files changed, 43 insertions(+), 13 deletions(-)

diff --git a/src/.prettierrc.json b/src/.prettierrc.json
index 0c476f5..d111229 100644
--- a/src/.prettierrc.json
+++ b/src/.prettierrc.json
@@ -1,5 +1,5 @@
 {
-	"printWidth": 240,
+	"printWidth": 120,
 	"tabWidth": 4,
 	"useTabs": true,
 	"semi": true,
diff --git a/src/client/webapp/elements/components/infinite-scroll.tsx b/src/client/webapp/elements/components/infinite-scroll.tsx
index 5997d3b..3179c73 100644
--- a/src/client/webapp/elements/components/infinite-scroll.tsx
+++ b/src/client/webapp/elements/components/infinite-scroll.tsx
@@ -1,10 +1,11 @@
-import React, { ReactNode } from 'react';
+import React, { MutableRefObject, ReactNode, RefObject, useCallback, useRef } from 'react';
 
 import { LoadableValueScrolling } from '../require/loadables';
 import { useScrollableCallables } from '../require/react-helper';
 import Retry from './retry';
 
 export interface InfiniteScrollRecoilProps<T, E> {
+	infiniteScrollRef: MutableRefObject<HTMLDivElement | null>;
 	scrollable: LoadableValueScrolling<T, E>;
 	initialErrorMessage: string; // for if there was a problem loading the initial messages
 	aboveErrorMessage: string; // for if there was a problem loading messages above the list
@@ -12,12 +13,13 @@ export interface InfiniteScrollRecoilProps<T, E> {
 	children: ReactNode;
 }
 function InfiniteScrollRecoil<T>(props: InfiniteScrollRecoilProps<T[], T>) {
-	const { scrollable, initialErrorMessage, aboveErrorMessage, belowErrorMessage, children } = props;
+	const { infiniteScrollRef, scrollable, initialErrorMessage, aboveErrorMessage, belowErrorMessage, children } =
+		props;
 
 	const { fetchAboveCallable, fetchBelowCallable, onScrollCallable } = useScrollableCallables(scrollable, 600); // activate fetch above/below when 600 client px from the top/bottom
 
 	return (
-		<div className="infinite-scroll-scroll-base" onScroll={onScrollCallable}>
+		<div ref={infiniteScrollRef} className="infinite-scroll-scroll-base" onScroll={onScrollCallable}>
 			<div className="infinite-scroll-elements">
 				<Retry error={scrollable?.above?.error} text={aboveErrorMessage} retryFunc={fetchAboveCallable} />
 				{children}
diff --git a/src/client/webapp/elements/lists/message-list.tsx b/src/client/webapp/elements/lists/message-list.tsx
index 7d2eb15..465e728 100644
--- a/src/client/webapp/elements/lists/message-list.tsx
+++ b/src/client/webapp/elements/lists/message-list.tsx
@@ -3,22 +3,20 @@ const electronConsole = electronRemote.getGlobal('console') as Console;
 import Logger from '../../../../logger/logger';
 const LOG = Logger.create(__filename, electronConsole);
 
-import React, { FC, useEffect, useMemo } from 'react';
+import React, { FC, useEffect, useMemo, useRef } from 'react';
 import { Message } from '../../data-types';
 import MessageElement from './components/message-element';
-import { currGuildActiveChannelMessagesState, currGuildState } from '../require/atoms';
+import { currGuildActiveChannelMessagesState, currGuildSelfMemberState, currGuildState } from '../require/atoms';
 import { useRecoilValue } from 'recoil';
 import { isFailed, isLoaded, isPended, isUnload } from '../require/loadables';
 import InfiniteScrollRecoil from '../components/infinite-scroll';
 
 const MessageList: FC = () => {
-	// const scrollToBottomFunc = useCallback(() => {
-	// 	if (!infiniteScrollElementRef.current) return;
-	// 	infiniteScrollElementRef.current.scrollTop = 0; // Keep in mind that this is reversed since we are in flex-flow: column-reverse
-	// }, []);
+	const infiniteScrollElementRef = useRef<HTMLDivElement>(null);
 
 	const guild = useRecoilValue(currGuildState);
 	const messages = useRecoilValue(currGuildActiveChannelMessagesState);
+	const selfMember = useRecoilValue(currGuildSelfMemberState);
 
 	// TODO: Show loading indicators if above/below are pending
 	// TODO: Show nicer retry buttons (and test the retry buttons)
@@ -34,9 +32,26 @@ const MessageList: FC = () => {
 		} else if (isFailed(messages)) {
 			LOG.debug('recoilMessages failed');
 		}
-		// lOG.debug('recoilMessages update', { recoilMessagesLength: recoilMessages.value?.length ?? 'unloaded' });
 	}, [messages]);
 
+	useEffect(() => {
+		if (guild === null) return;
+		const onMessages = (messages: Message[]) => {
+			if (!infiniteScrollElementRef.current) return;
+			if (!isLoaded(selfMember)) return;
+			for (const message of messages) {
+				if (message.member.id === selfMember.value.id) {
+					// keep in mind that this is reversed since we are in flex-flow: column-reverse
+					infiniteScrollElementRef.current.scrollTop = 0;
+				}
+			}
+		};
+		guild.on('new-messages', onMessages);
+		return () => {
+			guild.off('new-messages', onMessages);
+		};
+	}, [guild, selfMember]);
+
 	const messageElements = useMemo(() => {
 		if (guild === null) return [];
 		if (!isLoaded(messages)) return [];
@@ -44,14 +59,27 @@ const MessageList: FC = () => {
 		for (let i = 0; i < messages.value.length; ++i) {
 			const prevMessage = messages.value[i - 1] ?? null;
 			const message = messages.value[i] as Message;
-			result.push(<MessageElement key={guild.id + 'm#' + message.id} guild={guild} message={message} prevMessage={prevMessage} />);
+			result.push(
+				<MessageElement
+					key={guild.id + 'm#' + message.id}
+					guild={guild}
+					message={message}
+					prevMessage={prevMessage}
+				/>,
+			);
 		}
 		return result;
 	}, [guild, messages]);
 
 	return (
 		<div className="message-list">
-			<InfiniteScrollRecoil scrollable={messages} initialErrorMessage="Unable to retrieve recent messages" aboveErrorMessage="Unable to retrieve messages above" belowErrorMessage="Unable to retrieve messages below">
+			<InfiniteScrollRecoil
+				infiniteScrollRef={infiniteScrollElementRef}
+				scrollable={messages}
+				initialErrorMessage="Unable to retrieve recent messages"
+				aboveErrorMessage="Unable to retrieve messages above"
+				belowErrorMessage="Unable to retrieve messages below"
+			>
 				{messageElements}
 			</InfiniteScrollRecoil>
 		</div>