Sample app frontend (#5931)

* Add darkmode

* Edit README

* Add comments and readme

* Fix UI

* Update README

* Update code-samples/eventing/bookstore-sample-app/frontend/client/pages/Main.js

Co-authored-by: Leo Li <leoli@redhat.com>

* Update code-samples/eventing/bookstore-sample-app/frontend/client/components/BookDetail.js

Co-authored-by: Leo Li <leoli@redhat.com>

* Change emoji

* Update code-samples/eventing/bookstore-sample-app/frontend/client/components/Toggle.js

Co-authored-by: Leo Li <leoli@redhat.com>

* Fix UI

* Align time

---------

Co-authored-by: Leo Li <leoli@redhat.com>

code-samples/eventing/bookstore-sample-app/frontend/.eslintrc.json

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+{
+  "extends": "next/core-web-vitals"
+}

code-samples/eventing/bookstore-sample-app/frontend/.gitignore

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+# See https://help.github.com/articles/ignoring-files/ for more about ignoring files.
+
+# dependencies
+/node_modules
+/.pnp
+.pnp.js
+.yarn/install-state.gz
+
+# testing
+/coverage
+
+# next.js
+/.next/
+/out/
+
+# production
+/build
+
+# misc
+.DS_Store
+*.pem
+
+# debug
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+
+# local env files
+.env*.local
+
+# vercel
+.vercel
+
+# typescript
+*.tsbuildinfo
+next-env.d.ts

code-samples/eventing/bookstore-sample-app/frontend/Dockerfile

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+# Use a base image with Node.js LTS
+FROM node:lts-alpine
+
+# Set the working directory inside the container
+WORKDIR /app
+
+# Copy package.json and package-lock.json to the working directory
+COPY package*.json ./
+
+# Install dependencies
+RUN npm install
+
+# Copy the rest of your application code to the working directory
+COPY . .
+
+# Build the Next.js application
+RUN npm run build
+
+# Expose the port your app runs on
+EXPOSE 3000
+
+# Define the command to run your app
+CMD ["npm", "run dev"]

code-samples/eventing/bookstore-sample-app/frontend/README.md

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+# Getting Started
+
+This app use Next.js and TailwindCSS as main packages. Use this command to install all dependencies:
+
+```bash
+npm install
+```
+
+To run application, use:
+
+```bash
+npm run dev
+# or
+yarn dev
+# or
+pnpm dev
+# or
+bun dev
+```
+
+Open [http://localhost:3000](http://localhost:3000) with your browser to see the result.
+
+# Project Structures
+
+- app/: Contains the main layout, page, and global styling.
+- client/: Contains components and pages used in the application.
+- public/images/: Contains image files.
+- next-env.d.ts, next.config.mjs, package-lock.json, package.json, postcss.config.js, tailwind.config.js, tsconfig.json: Configuration files for Next.js, Tailwind CSS, and TypeScript.
+
+# Containerize Application
+
+This repository contains a Next.js application that utilizes next-themes and Tailwind CSS. This README file provides instructions on how to containerize the application using Docker.
+
+## Prerequisites
+
+- Docker installed on your machine. You can download and install Docker from [here](https://www.docker.com/get-started).
+
+## Dockerization Steps
+
+1. Clone this repository to your local machine.
+2. Navigate to the root directory of the cloned repository.
+
+### Building the Docker Image
+
+Run the following command to build the Docker image:
+
+```bash
+docker build -t frontend .
+```
+
+## Running the Docker Container
+
+Once the image is built, you can run a container using the following command:
+
+```bash
+docker run -d -p 3000:3000 frontend
+```

code-samples/eventing/bookstore-sample-app/frontend/app/globals.css

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+@tailwind base;
+@tailwind components;
+@tailwind utilities;
+
+@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@400;500;600;700&display=swap');
+
+#__next {
+	min-height: 100vh;
+	width: 100%;
+	display: flex;
+	flex-direction: column;
+}
+
+body {
+	font-family: 'Poppins', sans-serif;
+}
+
+@layer utilities {
+	.text-balance {
+		text-wrap: balance;
+	}
+}

code-samples/eventing/bookstore-sample-app/frontend/app/layout.tsx

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+import type { Metadata } from 'next';
+import { Inter } from 'next/font/google';
+import './globals.css';
+
+const inter = Inter({ subsets: ['latin'] });
+
+export const metadata: Metadata = {
+	title: 'Knative Bookstore',
+	description: 'Bookstore Sample Application from Knative',
+	icons: {
+		icon: '/images/knative-logo.png',
+	},
+};
+
+export default function RootLayout({
+	children,
+}: Readonly<{
+	children: React.ReactNode;
+}>) {
+	return (
+		<html lang='en'>
+			<body className={inter.className}>{children}</body>
+		</html>
+	);
+}

code-samples/eventing/bookstore-sample-app/frontend/app/page.tsx

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+'use client';
+import Main from '../client/pages/Main';
+import { ThemeProvider } from 'next-themes';
+
+export default function Home() {
+	return (
+		<ThemeProvider attribute='class'>
+			<Main />
+		</ThemeProvider>
+	);
+}

code-samples/eventing/bookstore-sample-app/frontend/client/components/BookDetail.js

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+const BookDetail = ({ book }) => {
+    return (
+        <div className='flex flex-col md:flex-row md:items-start p-8 space-x-8 justify-center items-center font-sans'>
+            <div className='mb-4 md:mb-0 md:mr-8'>
+                <img src={book.img} alt='Book Cover' className='w-48 h-auto' />
+            </div>
+            <div>
+                <div className='space-y-4'>
+                    <div className='grid grid-cols-[auto_1fr] gap-x-2 items-center'>
+                        <span className='font-bold text-left'>Title:</span>
+                        <span className='text-left'>{book.title}</span>
+                    </div>
+                    <div className='grid grid-cols-[auto_1fr] gap-x-2 items-center'>
+                        <span className='font-bold text-left'>Author:</span>
+                        <span className='text-left'>{book.author}</span>
+                    </div>
+                    <div className='grid grid-cols-[auto_1fr] gap-x-2 items-center'>
+                        <span className='font-bold text-left'>ISBN:</span>
+                        <span>{book.ISBN}</span>
+                    </div>
+                    <div className='grid grid-cols-[auto_1fr] gap-x-2 items-center'>
+                        <span className='font-bold text-left'>Publisher:</span>
+                        <span>{book.publisher}</span>
+                    </div>
+                    <div className='grid grid-cols-[auto_1fr] gap-x-2 items-center'>
+                        <span className='font-bold text-left'>Published Date:</span>
+                        <span>{book.publishedDate}</span>
+                    </div>
+                    <div className='grid grid-cols-[auto_1fr] gap-x-2 items-center'>
+                        <span className='font-bold text-left'>Description:</span>
+                        <span>{book.description}</span>
+                    </div>
+                    <div className='grid grid-cols-[auto_1fr] gap-x-2 items-center'>
+                        <span className='font-bold text-left'>Price:</span>
+                        <span>{book.price}</span>
+                    </div>
+                </div>
+            </div>
+        </div>
+    );
+};
+
+export default BookDetail;

code-samples/eventing/bookstore-sample-app/frontend/client/components/CommentDisplay.js

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+import Emoji from './Emoji';
+const CommentDisplay = ({ comment }) => {
+	// Assume receiving a comment object
+	let emoji;
+	if (comment.emotion === 'Positive') {
+		emoji = '😃';
+	} else if (comment.emotion === 'Neutral') {
+		emoji = '😐';
+	} else {
+		emoji = '😡';
+	}
+	return (
+		<div className='flex my-4 p-4 justify-center align-middle items-center'>
+			<div className='comment-display w-full w-7/12 flex flex-row rounded-lg p-4 bg-gray-800 text-white dark:bg-white dark:text-black'>
+				<div className='flex items-center justify-center md:w-1/12'>
+					<img
+						src={comment.avatar}
+						alt='Avatar'
+						className='rounded-full w-8 h-8'
+					/>
+				</div>
+				<div className='md:w-1/12 flex items-center content-center text-gray-200 dark:text-black'>
+					{comment.time}
+				</div>
+				<div className='md:w-9/12 '>
+					<span className='h-full flex items-center content-center'>
+						{comment.text}
+					</span>
+				</div>
+				<div className='md:w-1/12 text-4xl flex items-center content-center'>
+					<Emoji symbol={emoji} label={comment.emotion} size='text-2xl' />
+				</div>
+			</div>
+		</div>
+	);
+};
+
+export default CommentDisplay;

code-samples/eventing/bookstore-sample-app/frontend/client/components/CommentForm.js

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+'use-client';
+import { useState } from 'react';
+const CommentForm = () => {
+	const [hover, setHover] = useState(false);
+	const [comment, setComment] = useState('');
+
+	const handleInputChange = (event) => {
+		setComment(event.target.value);
+	};
+
+	const handleSubmit = (event) => {
+		event.preventDefault();
+		console.log('Submitted comment:', comment); // Use inspect to see
+	};
+	return (
+		<div className='flex my-4 p-4 justify-center'>
+			<form
+				className='w-full w-8/12 flex flex-col items-end '
+				onSubmit={handleSubmit}
+			>
+				<textarea
+					className='form-textarea w-full mb-2 p-2 border border-2 border-black rounded-lg p-4'
+					rows='3'
+					placeholder='Leave your comment here...'
+					value={comment}
+					onChange={handleInputChange}
+				></textarea>
+				<button
+					type='submit'
+					className={`font-bold py-2 px-9 rounded ${
+						hover ? '' : 'bg-blue-600'
+					}`}
+					style={{ backgroundColor: hover ? '#A0DDFF' : '#A5D8FF' }}
+					onMouseEnter={() => setHover(true)}
+					onMouseLeave={() => setHover(false)}
+				>
+					Submit
+				</button>
+			</form>
+		</div>
+	);
+};
+
+export default CommentForm;

code-samples/eventing/bookstore-sample-app/frontend/client/components/CommentList.js

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+import CommentDisplay from './CommentDisplay';
+const CommentList = () => {
+	const comment = {
+		avatar: '/images/avatar.jpg',
+		time: '10:05',
+		text: 'I used this provider to insert a different theme object depending on a person ',
+		emotion: 'Neutral',
+	};
+	return <CommentDisplay comment={comment} />;
+};
+
+export default CommentList;

code-samples/eventing/bookstore-sample-app/frontend/client/components/Emoji.js

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+import React from 'react';
+const Emoji = (props) => (
+	<span
+		className='emoji'
+		role='img'
+		aria-label={props.label ? props.label : ''}
+		aria-hidden={props.label ? 'false' : 'true'}
+	>
+		{props.symbol}
+	</span>
+);
+export default Emoji;

code-samples/eventing/bookstore-sample-app/frontend/client/components/Header.js

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+import Image from 'next/image';
+import Toggle from './Toggle';
+
+const Header = () => {
+	return (
+		<div className='flex justify-between p-4'>
+			<header className='flex items-center p-4'>
+				<Image
+					src='/images/knative-logo.png'
+					alt='Knative BookStore Logo'
+					width={50}
+					height={50}
+					className='mr-2'
+				/>
+				<h1 className='text-3xl font-bold'>Knative BookStore</h1>
+			</header>
+			<Toggle />
+		</div>
+	);
+};
+
+export default Header;

code-samples/eventing/bookstore-sample-app/frontend/client/components/Toggle.js

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+'use client';
+import React from 'react';
+import { useTheme } from 'next-themes';
+import { useEffect } from 'react';
+
+const Toggle = () => {
+	const { systemTheme, theme, setTheme } = useTheme();
+	useEffect(() => {
+		const systemPreference = window.matchMedia('(prefers-color-scheme: dark)')
+			.matches
+			? 'dark'
+			: 'light';
+
+		setTheme(systemPreference);
+	}, []);
+	return (
+		<button
+			onClick={() => (theme == 'dark' ? setTheme('light') : setTheme('dark'))}
+			className='bg-gray-800 dark:bg-gray-50 hover:bg-gray-600 dark:hover:bg-gray-300 transition-all duration-100 text-white dark:text-gray-800 px-6 py-1 text-xl md:text-2xl rounded-md'
+		>
+			Mode
+		</button>
+	);
+};
+
+export default Toggle;