Build chat UI with real-time messaging and i18n
This commit is contained in:
Francesco Lorenzo D'Amico
+369
-106
@@ -1,121 +1,384 @@
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import { useState } from 'react'
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import reactLogo from './assets/react.svg'
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import viteLogo from './assets/vite.svg'
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import heroImg from './assets/hero.png'
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import { useEffect, useMemo, useRef, useState } from 'react'
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import { useTranslation } from 'react-i18next'
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import { io } from 'socket.io-client'
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import { ERROR_MESSAGES } from './constants/errorMessages'
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import { validateJoinForm } from './utils/validators'
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import './App.css'
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const API_URL = import.meta.env.VITE_API_URL ?? 'http://localhost:4000'
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function App() {
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const [count, setCount] = useState(0)
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const { t } = useTranslation()
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const [username, setUsername] = useState('')
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const [room, setRoom] = useState('general')
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const [session, setSession] = useState(null)
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const [status, setStatus] = useState('idle')
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const [messages, setMessages] = useState([])
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const [participants, setParticipants] = useState([])
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const [messageInput, setMessageInput] = useState('')
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const [error, setError] = useState('')
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const socketRef = useRef(null)
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const messagesEndRef = useRef(null)
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const connectionLabel = t(`status.${status}`, { defaultValue: status })
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const isConnected = status === 'connected'
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useEffect(() => {
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if (!session?.id || !session?.room) {
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setStatus('idle')
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return
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}
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let isCancelled = false
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let retryCount = 0
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let reconnectTimer
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const connect = () => {
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if (isCancelled) return
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setStatus(retryCount === 0 ? 'connecting' : 'reconnecting')
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const socket = io(API_URL, {
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auth: {
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room: session.room,
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userId: session.id,
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},
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reconnectionAttempts: 5,
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transports: ['websocket'],
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})
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socketRef.current = socket
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socket.on('connect', () => {
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retryCount = 0
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setStatus('connected')
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})
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socket.io.on('reconnect_attempt', () => {
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if (!isCancelled) {
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setStatus('reconnecting')
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}
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})
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socket.io.on('reconnect_failed', () => {
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if (!isCancelled) {
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setStatus('error')
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}
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})
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socket.on('connect_error', (socketError) => {
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if (isCancelled) return
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setError(socketError.message || ERROR_MESSAGES.connection.failed)
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setStatus('error')
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})
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socket.on('disconnect', (reason) => {
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if (isCancelled) return
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if (reason !== 'io client disconnect' && retryCount < 5) {
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retryCount += 1
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setStatus('reconnecting')
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} else {
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setStatus('error')
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}
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})
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socket.on('history:init', (payload) => {
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setMessages(Array.isArray(payload) ? payload : [])
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})
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socket.on('message:new', (payload) => {
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if (payload) {
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setMessages((prev) => [...prev, payload])
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}
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})
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socket.on('participants:update', (payload) => {
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setParticipants(Array.isArray(payload) ? payload : [])
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})
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socket.on('connection:ready', () => {
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setError('')
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})
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}
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reconnectTimer = setTimeout(() => {
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if (!socketRef.current?.connected && !isCancelled) {
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setStatus('connecting')
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}
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}, 0)
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connect()
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return () => {
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isCancelled = true
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clearTimeout(reconnectTimer)
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socketRef.current?.disconnect()
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socketRef.current = null
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}
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}, [session?.id, session?.room])
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useEffect(() => {
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messagesEndRef.current?.scrollIntoView({ behavior: 'smooth' })
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}, [messages])
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const participantCount = participants.length
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const handleJoin = async (event) => {
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event.preventDefault()
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const validationError = validateJoinForm(username, room)
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if (validationError) {
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setError(validationError)
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return
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}
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setError('')
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setStatus(session ? 'reconnecting' : 'connecting')
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try {
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const response = await fetch(`${API_URL}/rooms/${encodeURIComponent(room.trim())}/join`, {
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method: 'POST',
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headers: { 'Content-Type': 'application/json' },
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body: JSON.stringify({
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username: username.trim(),
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userId: session?.id,
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}),
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})
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if (!response.ok) {
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throw new Error(ERROR_MESSAGES.api.joinFailed)
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}
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const data = await response.json()
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if (!data?.user) {
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throw new Error(ERROR_MESSAGES.api.noUserReturned)
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}
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setSession(data.user)
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setUsername(data.user.username)
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setRoom(data.user.room)
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await fetchRoomSnapshots(data.user.room)
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} catch (joinError) {
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console.error(joinError)
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setError(joinError.message)
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setStatus('error')
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}
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}
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const fetchRoomSnapshots = async (targetRoom) => {
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const encodedRoom = encodeURIComponent(targetRoom)
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try {
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const [messagesResponse, participantsResponse] = await Promise.all([
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fetch(`${API_URL}/rooms/${encodedRoom}/messages`),
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fetch(`${API_URL}/rooms/${encodedRoom}/participants`),
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])
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if (messagesResponse.ok) {
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const { messages: history } = await messagesResponse.json()
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setMessages(history)
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}
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if (participantsResponse.ok) {
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const { participants: list } = await participantsResponse.json()
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setParticipants(list)
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}
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} catch (snapshotError) {
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console.warn(t(ERROR_MESSAGES.api.snapshotFailed), snapshotError)
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}
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}
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const handleSendMessage = (event) => {
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event.preventDefault()
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if (!session || !messageInput.trim()) {
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return
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}
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const socket = socketRef.current
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if (!socket || !socket.connected) {
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setError(ERROR_MESSAGES.connection.noActiveConnection)
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return
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}
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try {
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socket.emit('message:send', {
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text: messageInput.trim(),
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})
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setMessageInput('')
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setError('')
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} catch (sendError) {
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console.error(sendError)
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setError(ERROR_MESSAGES.connection.sendFailed)
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}
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}
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const handleLeave = async () => {
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if (!session) return
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try {
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await fetch(`${API_URL}/rooms/${encodeURIComponent(session.room)}/leave`, {
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method: 'POST',
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headers: { 'Content-Type': 'application/json' },
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body: JSON.stringify({ userId: session.id }),
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})
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} catch (leaveError) {
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console.warn(t(ERROR_MESSAGES.api.leaveFailed), leaveError)
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} finally {
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setSession(null)
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setMessages([])
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setParticipants([])
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setStatus('idle')
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}
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}
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const connectionHint = useMemo(() => {
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if (!session) return t('hint.noSession')
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switch (status) {
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case 'connecting': return t('hint.connecting')
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case 'reconnecting': return t('hint.reconnecting')
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case 'error': return t('hint.error')
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default: return t('hint.joined', { room: session.room, username: session.username })
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}
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}, [session, status, t])
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return (
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<>
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<section id="center">
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<div className="hero">
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<img src={heroImg} className="base" width="170" height="179" alt="" />
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<img src={reactLogo} className="framework" alt="React logo" />
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<img src={viteLogo} className="vite" alt="Vite logo" />
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</div>
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<div className="app-shell">
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<header className="page-header">
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<div>
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<h1>Get started</h1>
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<p>
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Edit <code>src/App.jsx</code> and save to test <code>HMR</code>
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</p>
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<p className="eyebrow">{t('app.title')}</p>
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<h1>{t('app.headline')}</h1>
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<p>{connectionHint}</p>
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</div>
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<button
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className="counter"
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onClick={() => setCount((count) => count + 1)}
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>
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Count is {count}
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</button>
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<div className={`status-badge status-${status}`}>
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<span className="status-dot" aria-hidden="true"></span>
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{connectionLabel}
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</div>
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</header>
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<section className="panel">
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<form className="session-form" onSubmit={handleJoin}>
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<div className="field-group">
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<label htmlFor="username">{t('form.username')}</label>
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<input
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id="username"
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value={username}
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placeholder={t('form.usernamePlaceholder')}
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onChange={(event) => setUsername(event.target.value)}
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/>
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</div>
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<div className="field-group">
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<label htmlFor="room">{t('form.room')}</label>
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<input
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id="room"
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value={room}
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placeholder={t('form.roomPlaceholder')}
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onChange={(event) => setRoom(event.target.value.toLowerCase())}
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/>
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</div>
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<div className="actions">
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<button type="submit">
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{session ? t('form.update') : t('form.connect')}
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</button>
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{session ? (
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<button type="button" className="ghost" onClick={handleLeave}>
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{t('form.leave')}
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</button>
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) : null}
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</div>
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</form>
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{error ? <p className="form-error">{t(error)}</p> : null}
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</section>
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<div className="ticks"></div>
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<section id="next-steps">
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<div id="docs">
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<svg className="icon" role="presentation" aria-hidden="true">
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<use href="/icons.svg#documentation-icon"></use>
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</svg>
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<h2>Documentation</h2>
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<p>Your questions, answered</p>
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<main className="chat-grid">
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<section className="chat-panel">
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<header className="chat-panel__header">
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<div>
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<h2>{t('chat.title')}</h2>
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<p>{t('chat.liveFeed', { room: session?.room ?? room })}</p>
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</div>
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<span className="muted">{t('chat.messageCount', { count: messages.length })}</span>
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</header>
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<div className="chat-panel__body">
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{messages.length === 0 ? (
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<p className="empty-state">{t('chat.empty')}</p>
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) : (
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messages.map((message) => (
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<article
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key={message.id}
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className={`message ${message.userId === session?.id ? 'me' : ''}`}
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>
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<header>
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<strong>{message.username}</strong>
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<span>{formatTime(message.createdAt)}</span>
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</header>
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<p>{message.text}</p>
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</article>
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))
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)}
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<div ref={messagesEndRef} />
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</div>
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<form className="composer" onSubmit={handleSendMessage}>
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<input
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value={messageInput}
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onChange={(event) => setMessageInput(event.target.value)}
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placeholder={session ? t('chat.placeholder') : t('chat.placeholderDisabled')}
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disabled={!session || !isConnected}
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/>
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<button
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type="submit"
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disabled={!session || !messageInput.trim() || !isConnected}
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>
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{t('chat.send')}
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</button>
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</form>
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</section>
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<aside className="participants-panel">
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<header>
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<h2>{t('participants.title')}</h2>
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<span>{participantCount}</span>
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</header>
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<ul>
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<li>
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<a href="https://vite.dev/" target="_blank">
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<img className="logo" src={viteLogo} alt="" />
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Explore Vite
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</a>
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</li>
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<li>
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<a href="https://react.dev/" target="_blank">
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<img className="button-icon" src={reactLogo} alt="" />
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Learn more
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</a>
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</li>
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{participants.length === 0 ? (
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<li className="muted">{t('participants.empty')}</li>
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) : (
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participants.map((participant) => (
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<li key={participant.id}>
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<span
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className={`presence ${participant.isOnline ? 'online' : 'away'}`}
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aria-label={participant.isOnline ? t('participants.online') : 'offline'}
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></span>
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<div>
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<p>{participant.username}</p>
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<small>
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{participant.isOnline
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? t('participants.online')
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: t('participants.lastActive', { time: formatRelativeTime(participant.lastActiveAt) })}
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</small>
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</div>
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</li>
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))
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)}
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</ul>
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</div>
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<div id="social">
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<svg className="icon" role="presentation" aria-hidden="true">
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<use href="/icons.svg#social-icon"></use>
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</svg>
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<h2>Connect with us</h2>
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<p>Join the Vite community</p>
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<ul>
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<li>
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<a href="https://github.com/vitejs/vite" target="_blank">
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<svg
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className="button-icon"
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role="presentation"
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aria-hidden="true"
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>
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<use href="/icons.svg#github-icon"></use>
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</svg>
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GitHub
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</a>
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</li>
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<li>
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<a href="https://chat.vite.dev/" target="_blank">
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<svg
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className="button-icon"
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role="presentation"
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aria-hidden="true"
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>
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<use href="/icons.svg#discord-icon"></use>
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</svg>
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Discord
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</a>
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</li>
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<li>
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<a href="https://x.com/vite_js" target="_blank">
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<svg
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className="button-icon"
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role="presentation"
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aria-hidden="true"
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>
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<use href="/icons.svg#x-icon"></use>
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</svg>
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X.com
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</a>
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</li>
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<li>
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<a href="https://bsky.app/profile/vite.dev" target="_blank">
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<svg
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className="button-icon"
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role="presentation"
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aria-hidden="true"
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>
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<use href="/icons.svg#bluesky-icon"></use>
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</svg>
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Bluesky
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</a>
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</li>
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</ul>
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</div>
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</section>
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<div className="ticks"></div>
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<section id="spacer"></section>
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</>
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</aside>
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</main>
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</div>
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)
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}
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function formatTime(timestamp) {
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if (!timestamp) return ''
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return new Intl.DateTimeFormat('de-DE', {
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hour: '2-digit',
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minute: '2-digit',
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}).format(new Date(timestamp))
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}
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function formatRelativeTime(timestamp) {
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if (!timestamp) return ''
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const formatter = new Intl.RelativeTimeFormat('de', { numeric: 'auto' })
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const now = Date.now()
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const then = new Date(timestamp).getTime()
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const diffInMinutes = Math.round((then - now) / (1000 * 60))
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if (Math.abs(diffInMinutes) < 60) {
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return formatter.format(diffInMinutes, 'minute')
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}
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const diffInHours = Math.round(diffInMinutes / 60)
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if (Math.abs(diffInHours) < 24) {
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return formatter.format(diffInHours, 'hour')
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}
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const diffInDays = Math.round(diffInHours / 24)
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return formatter.format(diffInDays, 'day')
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}
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export default App
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Reference in New Issue
Block a user