get distracted by non-essential frontend stuff

evm/contracts/MessageBox.sol

@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: UNLICENSED
+// SPDX-License-Identifier: MIT
 pragma solidity ^0.8.24;
 
 contract MessageBox {

frontend/src/components/ConnectMetamaskButton.tsx

@@ -1,5 +1,6 @@
 import { useStore } from "../store";
-import { shortenAddress, tryWithToast } from "../utils";
+import { tryWithToast } from "../utils/toast";
+import { formatPadTokenAmount, shortenAddress } from "../utils/ui";
 import { web3 } from "../web3";
 
 export function ConnectMetamaskButton() {
@@ -8,6 +9,7 @@ export function ConnectMetamaskButton() {
 	const unsetConnectedAccount = useStore(
 		(state) => state.unsetConnectedAccount
 	);
+	const padTokenBalance = useStore((state) => state.padTokenBalance);
 
 	// https://docs.web3js.org/guides/getting_started/metamask/#react-app
 	async function connectMetamask() {
@@ -35,7 +37,18 @@ export function ConnectMetamaskButton() {
 				connectedAccount ? disconnectWallet() : connectMetamask()
 			}
 		>
-			{connectedAccount ? shortenAddress(connectedAccount) : "Connect MetaMask"}
+			{connectedAccount ? (
+				<>
+					{shortenAddress(connectedAccount)}
+					{padTokenBalance !== null && (
+						<div className="badge badge-secondary">
+							{formatPadTokenAmount(padTokenBalance)}
+						</div>
+					)}
+				</>
+			) : (
+				"Connect MetaMask"
+			)}
 		</button>
 	);
 }

frontend/src/components/ContextsProvider.tsx

@@ -0,0 +1,15 @@
+import { buildMainContextValue, MainContext } from "../contexts/MainContext";
+
+interface Props {
+	children: React.ReactNode;
+}
+
+export function ContextsProvider({ children }: Props) {
+	const mainContextValue = buildMainContextValue();
+
+	return (
+		<MainContext.Provider value={mainContextValue}>
+			{children}
+		</MainContext.Provider>
+	);
+}

frontend/src/contexts/MainContext.ts

@@ -0,0 +1,39 @@
+/* eslint-disable react-hooks/rules-of-hooks */
+
+import { useEffect } from "react";
+import { useStore } from "../store";
+import buildContext from "../utils/context";
+import { padToken } from "../web3";
+
+interface IMainContext {
+	fetchPadTokenBalance: () => Promise<void>;
+}
+
+export const [MainContext, useMainContext] = buildContext<IMainContext>();
+
+export function buildMainContextValue(): IMainContext {
+	const connectedAccount = useStore((state) => state.connectedAccount);
+	const setPadTokenBalance = useStore((state) => state.setPadTokenBalance);
+	const unsetPadTokenBalance = useStore((state) => state.unsetPadTokenBalance);
+
+	const fetchPadTokenBalance = async () => {
+		const balance: bigint = await padToken.methods
+			.balanceOf(connectedAccount)
+			.call();
+		if (typeof balance === "bigint") {
+			setPadTokenBalance(balance);
+		} else {
+			unsetPadTokenBalance();
+		}
+	};
+
+	useEffect(() => {
+		if (connectedAccount) {
+			fetchPadTokenBalance();
+		}
+	}, [connectedAccount]);
+
+	return {
+		fetchPadTokenBalance,
+	};
+}

frontend/src/evm-output/deployed_addresses.json

@@ -1,4 +1,4 @@
 {
-  "MessageBoxModule#MessageBox": "0x5FbDB2315678afecb367f032d93F642f64180aa3",
-  "MainModule#PADToken": "0xCf7Ed3AccA5a467e9e704C703E8D87F634fB0Fc9"
+  "MainModule#PADToken": "0x5FbDB2315678afecb367f032d93F642f64180aa3",
+  "MessageBoxModule#MessageBox": "0xe7f1725E7734CE288F8367e1Bb143E90bb3F0512"
 }

frontend/src/main.tsx

@@ -1,6 +1,7 @@
 import { RouterProvider, createRouter } from "@tanstack/react-router";
 import React from "react";
 import ReactDOM from "react-dom/client";
+import { ContextsProvider } from "./components/ContextsProvider";
 import "./index.css";
 import { routeTree } from "./routeTree.gen";
 
@@ -13,6 +14,8 @@ declare module "@tanstack/react-router" {
 
 ReactDOM.createRoot(document.getElementById("root")!).render(
 	<React.StrictMode>
+		<ContextsProvider>
 			<RouterProvider router={router} />
+		</ContextsProvider>
 	</React.StrictMode>
 );

frontend/src/routes/message-box.lazy.tsx

@@ -1,7 +1,7 @@
 import { createLazyFileRoute } from "@tanstack/react-router";
 import { useState } from "react";
 import { useStore } from "../store";
-import { toastError, tryWithToast } from "../utils";
+import { toastError, tryWithToast } from "../utils/toast";
 import { messageBox } from "../web3";
 
 export const Route = createLazyFileRoute("/message-box")({

frontend/src/routes/pad-token.lazy.tsx

@@ -1,8 +1,9 @@
 import { createLazyFileRoute } from "@tanstack/react-router";
 import { useState } from "react";
-import type { Numbers } from "web3";
 import { useStore } from "../store";
-import { getFormInputValue, toastError, tryWithToast } from "../utils";
+import { getFormInputValue } from "../utils/form";
+import { toastError, tryWithToast } from "../utils/toast";
+import { formatPadTokenAmount } from "../utils/ui";
 import { padToken, web3 } from "../web3";
 
 export const Route = createLazyFileRoute("/pad-token")({
@@ -28,10 +29,8 @@ function PadTokenPage() {
 		}
 
 		await tryWithToast("Balance Of", async () => {
-			const balanceBN: Numbers = await padToken.methods
-				.balanceOf(address)
-				.call();
-			setBalance(web3.utils.fromWei(balanceBN, "ether"));
+			const _balance: bigint = await padToken.methods.balanceOf(address).call();
+			setBalance(formatPadTokenAmount(_balance));
 		});
 	};
 
@@ -86,7 +85,7 @@ function PadTokenPage() {
 							Get
 						</button>
 						<div>
-							<span className="font-bold">Balance:</span> {balance} PAD
+							<span className="font-bold">Balance:</span> {balance}
 						</div>
 					</form>
 				</div>

frontend/src/store.ts

@@ -0,0 +1,19 @@
+import { create } from "zustand";
+
+interface State {
+	connectedAccount: string | null;
+	setConnectedAccount: (connectedAccount: string) => void;
+	unsetConnectedAccount: () => void;
+	padTokenBalance: bigint | null;
+	setPadTokenBalance: (padTokenBalance: bigint) => void;
+	unsetPadTokenBalance: () => void;
+}
+
+export const useStore = create<State>()((set, get) => ({
+	connectedAccount: null,
+	setConnectedAccount: (connectedAccount) => set({ connectedAccount }),
+	unsetConnectedAccount: () => set({ connectedAccount: null }),
+	padTokenBalance: null,
+	setPadTokenBalance: (padTokenBalance) => set({ padTokenBalance }),
+	unsetPadTokenBalance: () => set({ padTokenBalance: null }),
+}));

frontend/src/store.tsx

@@ -1,13 +0,0 @@
-import { create } from "zustand";
-
-interface State {
-	connectedAccount: string | null;
-	setConnectedAccount: (newAccount: string) => void;
-	unsetConnectedAccount: () => void;
-}
-
-export const useStore = create<State>()((set) => ({
-	connectedAccount: null,
-	setConnectedAccount: (newAccount) => set({ connectedAccount: newAccount }),
-	unsetConnectedAccount: () => set({ connectedAccount: null }),
-}));

frontend/src/utils/context.ts

@@ -0,0 +1,21 @@
+import { createContext, useContext } from "react";
+
+export default function buildContext<TContext>(): [
+	React.Context<TContext | null>,
+	() => TContext,
+] {
+	const builtContext = createContext<TContext | null>(null);
+
+	const builtUseContext = () => {
+		// eslint-disable-next-line react-hooks/rules-of-hooks
+		const contextInstance = useContext(builtContext);
+		if (contextInstance === null) {
+			throw new Error(
+				"You can use this hook only inside the context's provider."
+			);
+		}
+		return contextInstance;
+	};
+
+	return [builtContext, builtUseContext];
+}

frontend/src/utils/form.ts

@@ -0,0 +1,5 @@
+export function getFormInputValue(form: HTMLFormElement, name: string) {
+	// @ts-expect-error
+	const input = form.elements[name] as HTMLInputElement;
+	return input.value;
+}

frontend/src/utils/toast.ts

@@ -29,13 +29,3 @@ export async function tryWithToast(
 		);
 	}
 }
-
-export function shortenAddress(address: string) {
-	return address.slice(0, 6) + "..." + address.slice(-4);
-}
-
-export function getFormInputValue(form: HTMLFormElement, name: string) {
-	// @ts-expect-error
-	const input = form.elements[name] as HTMLInputElement;
-	return input.value;
-}

frontend/src/utils/ui.ts

@@ -0,0 +1,9 @@
+import { web3 } from "../web3";
+
+export function shortenAddress(address: string) {
+	return address.slice(0, 6) + "..." + address.slice(-4);
+}
+
+export function formatPadTokenAmount(amount: bigint) {
+	return `${web3.utils.fromWei(amount, "ether").replace(/\.*$/, "")} PAD`;
+}