Mobile app

We will use Ionic React to be able to reuse the BeaconSDK (Typescript) on a webview. Beacon is the protocol of communication between the dapp and the wallet.

Note : I do not recommend right know to develop a dapp in Flutter or React Native because you will need to use native beacon library without wallet popup mechanism to confirm transactions

Step 1 : Install IONIC

Install Ionic

npm install -g @ionic/cli
ionic start app blank --type react

Generate Smart contract types from taqueria plugin. It will generate Typescript classes from Smart contract interface definition that we will use on our frontend.

taq install @taqueria/plugin-contract-types
taq generate types ./app/src

Uninstall confliting old jest libraries/react-scripts and Install required Tezos web3 dependencies + vite

cd app
npm uninstall -S @testing-library/jest-dom @testing-library/react @testing-library/user-event @types/jest
rm -rf src/components
rm src/setupTests.ts src/App.test.tsx
echo '/// <reference types="vite/client" />' > src/vite-env.d.ts

npm install -S  @taquito/taquito @taquito/beacon-wallet @airgap/beacon-sdk  @tzkt/sdk-api
npm install -S -D @airgap/beacon-types vite @vitejs/plugin-react-swc @types/react @types/node

Polyfill issues fix

⚠️ ⚠️ ⚠️ Before we start we need to add the following dependencies in order to not get polyfill issues. The reason for this step is that certain required dependencies are Node APIs, thus not included in Browsers. But still needed for communication and interaction with Wallets and Smart Contracts.

For example, in my case, I installed this :

npm i -D process buffer crypto-browserify stream-browserify assert stream-http https-browserify os-browserify url path-browserify

then create a new file nodeSpecific.ts in the src folder of your project

touch src/nodeSpecific.ts

and edit with this content :

import { Buffer } from "buffer";

globalThis.Buffer = Buffer;

Finally create the vite.config.ts file

touch vite.config.ts

and edit it with this content :

import react from "@vitejs/plugin-react-swc";
import path from "path";
import { defineConfig } from "vite";
// https://vitejs.dev/config/
export default ({ command }) => {
  const isBuild = command === "build";

  return defineConfig({
    define: { "process.env": process.env, global: {} },
    plugins: [react()],
    build: {
      commonjsOptions: {
        transformMixedEsModules: true,
      },
    },
    resolve: {
      alias: {
        // dedupe @airgap/beacon-sdk
        // I almost have no idea why it needs `cjs` on dev and `esm` on build, but this is how it works 🤷‍♂️
        "@airgap/beacon-sdk": path.resolve(
          path.resolve(),
          `./node_modules/@airgap/beacon-sdk/dist/${
            isBuild ? "esm" : "cjs"
          }/index.js`
        ),
        stream: "stream-browserify",
        os: "os-browserify/browser",
        util: "util",
        process: "process/browser",
        buffer: "buffer",
        crypto: "crypto-browserify",
        assert: "assert",
        http: "stream-http",
        https: "https-browserify",
        url: "url",
        path: "path-browserify",
      },
    },
  });
};

Adaptation for Vite

Edit index.html, it fixes the Node buffer issue with nodeSpecific.ts file and points to our css file :

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="utf-8" />
    <title>Ionic App</title>

    <base href="/" />

    <meta name="color-scheme" content="light dark" />
    <meta
      name="viewport"
      content="viewport-fit=cover, width=device-width, initial-scale=1.0, minimum-scale=1.0, maximum-scale=1.0, user-scalable=no"
    />
    <meta name="format-detection" content="telephone=no" />
    <meta name="msapplication-tap-highlight" content="no" />

    <link rel="manifest" href="/manifest.json" />
    <link href="assets/styles.css" rel="stylesheet" />

    <link rel="shortcut icon" type="image/png" href="/favicon.png" />

    <!-- add to homescreen for ios -->
    <meta name="apple-mobile-web-app-capable" content="yes" />
    <meta name="apple-mobile-web-app-title" content="Ionic App" />
    <meta name="apple-mobile-web-app-status-bar-style" content="black" />
  </head>
  <body>
    <div id="root"></div>
    <script type="module" src="/src/nodeSpecific.ts"></script>
    <script type="module" src="/src/main.tsx"></script>
  </body>
</html>

Edit `src/main.tsx`` to force dark mode and remove React strict mode :

import { createRoot } from "react-dom/client";
import App from "./App";

const container = document.getElementById("root");
const root = createRoot(container!);

// Add or remove the "dark" class based on if the media query matches
document.body.classList.add("dark");

root.render(<App />);

Modify the default package.json default scripts to use vite instead of default react scripts

  "scripts": {
    "dev": "jq -r '\"VITE_CONTRACT_ADDRESS=\" + last(.tasks[]).output[0].address' ../.taq/testing-state.json > .env && vite --host",
    "ionic:build": "tsc -v && tsc && vite build",
    "build": " tsc -v && tsc && vite build",
    "lint": "eslint src --ext ts,tsx --report-unused-disable-directives --max-warnings 0",
    "preview": "vite preview",
    "ionic:serve": "vite dev --host",
    "sync": "npm run build && ionic cap sync --no-build"
  },

Step 2 : Edit the default Application file to configure page routing and add the style

Edit src/App.tsx main file

import {
  IonApp,
  IonRouterOutlet,
  RefresherEventDetail,
  setupIonicReact,
} from "@ionic/react";
import { IonReactRouter } from "@ionic/react-router";
import { Redirect, Route } from "react-router-dom";

/* Core CSS required for Ionic components to work properly */
import "@ionic/react/css/core.css";

/* Basic CSS for apps built with Ionic */
import "@ionic/react/css/normalize.css";
import "@ionic/react/css/structure.css";
import "@ionic/react/css/typography.css";

/* Optional CSS utils that can be commented out */
import "@ionic/react/css/display.css";
import "@ionic/react/css/flex-utils.css";
import "@ionic/react/css/float-elements.css";
import "@ionic/react/css/padding.css";
import "@ionic/react/css/text-alignment.css";
import "@ionic/react/css/text-transformation.css";

/* Theme variables */
import "./theme/variables.css";

import { NetworkType } from "@airgap/beacon-types";
import { BeaconWallet } from "@taquito/beacon-wallet";
import { InternalOperationResult } from "@taquito/rpc";
import {
  PollingSubscribeProvider,
  Subscription,
  TezosToolkit,
} from "@taquito/taquito";
import React, { Dispatch, SetStateAction, useEffect, useState } from "react";
import { MainWalletType, Storage } from "./main.types";
import { HomeScreen } from "./pages/HomeScreen";
import { RulesScreen } from "./pages/Rules";
import { SessionScreen } from "./pages/SessionScreen";
import { TopPlayersScreen } from "./pages/TopPlayersScreen";
import {
  MMap,
  address,
  bytes,
  mutez,
  nat,
  timestamp,
  unit,
} from "./type-aliases";

setupIonicReact();

export class Action implements ActionCisor, ActionPaper, ActionStone {
  cisor?: unit;
  paper?: unit;
  stone?: unit;
  constructor(cisor?: unit, paper?: unit, stone?: unit) {
    this.cisor = cisor;
    this.paper = paper;
    this.stone = stone;
  }
}
export type ActionCisor = { cisor?: unit };
export type ActionPaper = { paper?: unit };
export type ActionStone = { stone?: unit };

export type Session = {
  asleep: timestamp;
  board: MMap<nat, { Some: address } | null>;
  current_round: nat;
  decoded_rounds: MMap<
    nat,
    Array<{
      action: { cisor: unit } | { paper: unit } | { stone: unit };
      player: address;
    }>
  >;
  players: Array<address>;
  pool: mutez;
  result: { draw: unit } | { inplay: unit } | { winner: address };
  rounds: MMap<
    nat,
    Array<{
      action: bytes;
      player: address;
    }>
  >;
  total_rounds: nat;
};

export type UserContextType = {
  storage: Storage | null;
  setStorage: Dispatch<SetStateAction<Storage | null>>;
  userAddress: string;
  setUserAddress: Dispatch<SetStateAction<string>>;
  userBalance: number;
  setUserBalance: Dispatch<SetStateAction<number>>;
  Tezos: TezosToolkit;
  wallet: BeaconWallet;
  mainWalletType: MainWalletType | null;
  loading: boolean;
  setLoading: Dispatch<SetStateAction<boolean>>;
  refreshStorage: (event?: CustomEvent<RefresherEventDetail>) => Promise<void>;
  subReveal: Subscription<InternalOperationResult> | undefined;
  subNewRound: Subscription<InternalOperationResult> | undefined;
};
export const UserContext = React.createContext<UserContextType | null>(null);

const App: React.FC = () => {
  const Tezos = new TezosToolkit("https://ghostnet.tezos.marigold.dev");

  const wallet = new BeaconWallet({
    name: "Training",
    preferredNetwork: NetworkType.GHOSTNET,
  });

  Tezos.setWalletProvider(wallet);
  Tezos.setStreamProvider(
    Tezos.getFactory(PollingSubscribeProvider)({
      shouldObservableSubscriptionRetry: true,
      pollingIntervalMilliseconds: 1500,
    })
  );

  const [userAddress, setUserAddress] = useState<string>("");
  const [userBalance, setUserBalance] = useState<number>(0);
  const [storage, setStorage] = useState<Storage | null>(null);
  const [mainWalletType, setMainWalletType] = useState<MainWalletType | null>(
    null
  );
  const [loading, setLoading] = useState<boolean>(false);

  const [subscriptionsDone, setSubscriptionsDone] = useState<boolean>(false);
  const [subReveal, setSubReveal] =
    useState<Subscription<InternalOperationResult>>();
  const [subNewRound, setSubNewRound] =
    useState<Subscription<InternalOperationResult>>();

  const refreshStorage = async (
    event?: CustomEvent<RefresherEventDetail>
  ): Promise<void> => {
    try {
      if (!userAddress) {
        const activeAccount = await wallet.client.getActiveAccount();
        let userAddress: string;
        if (activeAccount) {
          userAddress = activeAccount.address;
          setUserAddress(userAddress);
          const balance = await Tezos.tz.getBalance(userAddress);
          setUserBalance(balance.toNumber());
        }
      }

      console.log(
        "VITE_CONTRACT_ADDRESS:",
        import.meta.env.VITE_CONTRACT_ADDRESS
      );
      const mainWalletType: MainWalletType =
        await Tezos.wallet.at<MainWalletType>(
          import.meta.env.VITE_CONTRACT_ADDRESS
        );
      const storage: Storage = await mainWalletType.storage();
      setMainWalletType(mainWalletType);
      setStorage(storage);
      console.log("Storage refreshed");

      event?.detail.complete();
    } catch (error) {
      console.log("error refreshing storage", error);
    }
  };

  useEffect(() => {
    try {
      if (!subscriptionsDone) {
        const sub = Tezos.stream.subscribeEvent({
          tag: "gameStatus",
          address: import.meta.env.VITE_CONTRACT_ADDRESS!,
        });

        sub.on("data", (e) => {
          console.log("on gameStatus event :", e);
          refreshStorage();
        });

        setSubReveal(
          Tezos.stream.subscribeEvent({
            tag: "reveal",
            address: import.meta.env.VITE_CONTRACT_ADDRESS,
          })
        );

        setSubNewRound(
          Tezos.stream.subscribeEvent({
            tag: "newRound",
            address: import.meta.env.VITE_CONTRACT_ADDRESS,
          })
        );
      } else {
        console.warn("Tezos.stream.subscribeEvent already done ... ignoring");
      }
    } catch (e) {
      console.log("Error with Smart contract event pooling", e);
    }

    console.log("Tezos.stream.subscribeEvent DONE");
    setSubscriptionsDone(true);
  }, []);

  useEffect(() => {
    if (userAddress) {
      console.warn("userAddress changed", wallet);
      (async () => await refreshStorage())();
    }
  }, [userAddress]);

  return (
    <IonApp>
      <UserContext.Provider
        value={{
          userAddress,
          userBalance,
          Tezos,
          wallet,
          storage,
          mainWalletType,
          setUserAddress,
          setUserBalance,
          setStorage,
          loading,
          setLoading,
          refreshStorage,
          subReveal,
          subNewRound,
        }}
      >
        <IonReactRouter>
          <IonRouterOutlet>
            <Route path={PAGES.HOME} component={HomeScreen} />
            <Route path={`${PAGES.SESSION}/:id`} component={SessionScreen} />
            <Route path={PAGES.TOPPLAYERS} component={TopPlayersScreen} />
            <Route path={PAGES.RULES} component={RulesScreen} />
            <Redirect exact from="/" to={PAGES.HOME} />
          </IonRouterOutlet>
        </IonReactRouter>
      </UserContext.Provider>
    </IonApp>
  );
};

export enum PAGES {
  HOME = "/home",
  SESSION = "/session",
  TOPPLAYERS = "/topplayers",
  RULES = "/rules",
}

export default App;

Explanations :

import "@ionic..." : Default standard Ionic imports
import ... from "@airgap/beacon-types" ... from "@taquito/beacon-wallet" ... from "@taquito/taquito" : Require libraries to interact with the Tezos node and the wallet
export class Action implements ActionCisor, ActionPaper, ActionStone {...} : Representation of the ligo variant Action in Typescript, we will need it when passing arguments on Play function
export type Session = {...} : Taqueria export the global Storage type but sadly not this sub-type from the Storage type, we will need it later, so we extract a copy
export const UserContext = React.createContext<UserContextType | null>(null): Global React context that is passed along pages. More info on React context here
const refreshStorage = async (event?: CustomEvent<RefresherEventDetail>): Promise<void> => {... : useful fonction to force the smart contract Storage to refresh on React state changes (user balance, state of the game)
useEffect(() => { ... Tezos.setStreamProvider(...) ... Tezos.stream.subscribeEvent({... : During Application initialization, we configure the wallet, the websocket listening to smart contract events
<IonApp><UserContext.Provider ... ><IonReactRouter><IonRouterOutlet><Route path={PAGES.HOME} component={HomeScreen} /> ... : We inject the React context to all pages. We declare the global routing of the application
export enum PAGES { HOME = "/home", ... : Declaration of the global routes

To add the default theming (CSS, pictures, etc...), copy the content of the git repository folder named assets folder to your local project (considering you cloned the repo and assets folder is on root folder)

cp -r ../../assets/* .

Step 3 : Connect / disconnect the wallet

We will declare 2 React Button components and fetch the user public hash key + balance

Let's create the 2 missing src component files and put code in it. On app folder, create these files.

touch src/ConnectWallet.tsx
touch src/DisconnectWallet.tsx

ConnectWallet button will create an instance wallet, get user permissions via a popup and then retrieve account information

Edit ConnectWallet.tsx

import { NetworkType } from "@airgap/beacon-types";
import { IonButton } from "@ionic/react";
import { BeaconWallet } from "@taquito/beacon-wallet";
import { TezosToolkit } from "@taquito/taquito";
import { Dispatch, SetStateAction } from "react";

type ButtonProps = {
  Tezos: TezosToolkit;
  setUserAddress: Dispatch<SetStateAction<string>>;
  setUserBalance: Dispatch<SetStateAction<number>>;
  wallet: BeaconWallet;
};

const ConnectButton = ({
  Tezos,
  setUserAddress,
  setUserBalance,
  wallet,
}: ButtonProps): JSX.Element => {
  const connectWallet = async (): Promise<void> => {
    try {
      console.log("before requestPermissions");

      await wallet.requestPermissions({
        network: {
          type: NetworkType.GHOSTNET,
          rpcUrl: "https://ghostnet.tezos.marigold.dev",
        },
      });
      console.log("after requestPermissions");

      // gets user's address
      const userAddress = await wallet.getPKH();
      const balance = await Tezos.tz.getBalance(userAddress);
      setUserBalance(balance.toNumber());
      setUserAddress(userAddress);
    } catch (error) {
      console.log("error connectWallet", error);
    }
  };

  return (
    <IonButton expand="full" onClick={connectWallet}>
      Connect Wallet
    </IonButton>
  );
};

export default ConnectButton;

DisconnectWallet button will clean wallet instance and all linked objects

import { IonFab, IonFabButton, IonIcon } from "@ionic/react";
import { BeaconWallet } from "@taquito/beacon-wallet";
import { power } from "ionicons/icons";
import { Dispatch, SetStateAction } from "react";

interface ButtonProps {
  wallet: BeaconWallet;
  setUserAddress: Dispatch<SetStateAction<string>>;
  setUserBalance: Dispatch<SetStateAction<number>>;
}

const DisconnectButton = ({
  wallet,
  setUserAddress,
  setUserBalance,
}: ButtonProps): JSX.Element => {
  const disconnectWallet = async (): Promise<void> => {
    setUserAddress("");
    setUserBalance(0);
    console.log("disconnecting wallet");
    await wallet.clearActiveAccount();
  };

  return (
    <IonFab slot="fixed" vertical="top" horizontal="end">
      <IonFabButton>
        <IonIcon icon={power} onClick={disconnectWallet} />
      </IonFabButton>
    </IonFab>
  );
};

export default DisconnectButton;

Save both file

Step 4 : Add missing pages and error utility class

Let's create the missing pages and the error utility class

touch src/pages/HomeScreen.tsx
touch src/pages/SessionScreen.tsx
touch src/pages/Rules.tsx
touch src/pages/TopPlayersScreen.tsx
touch src/TransactionInvalidBeaconError.ts

TransactionInvalidBeaconError.ts utility class is used to display human readable message from Beacon errors

Edit all files

HomeScreen.tsx : the home page where you can access all other pages

import {
  IonButton,
  IonButtons,
  IonContent,
  IonFooter,
  IonHeader,
  IonIcon,
  IonImg,
  IonInput,
  IonItem,
  IonLabel,
  IonList,
  IonModal,
  IonPage,
  IonRefresher,
  IonRefresherContent,
  IonSpinner,
  IonTitle,
  IonToolbar,
  useIonAlert,
} from "@ionic/react";
import { BigNumber } from "bignumber.js";
import { person } from "ionicons/icons";
import React, { useEffect, useRef, useState } from "react";
import { useHistory } from "react-router-dom";
import { PAGES, Session, UserContext, UserContextType } from "../App";
import ConnectButton from "../ConnectWallet";
import DisconnectButton from "../DisconnectWallet";
import { TransactionInvalidBeaconError } from "../TransactionInvalidBeaconError";
import Paper from "../assets/paper-logo.webp";
import Scissor from "../assets/scissor-logo.webp";
import Stone from "../assets/stone-logo.webp";
import XTZLogo from "../assets/xtz.webp";
import { SelectMembers } from "../components/TzCommunitySelectMembers";
import { address, nat } from "../type-aliases";

export const HomeScreen: React.FC = () => {
  const [presentAlert] = useIonAlert();
  const { push } = useHistory();

  const createGameModal = useRef<HTMLIonModalElement>(null);
  const selectGameModal = useRef<HTMLIonModalElement>(null);
  function dismissCreateGameModal() {
    console.log("dismissCreateGameModal");
    createGameModal.current?.dismiss();
  }
  function dismissSelectGameModal() {
    selectGameModal.current?.dismiss();
    const element = document.getElementById("home");
    setTimeout(() => {
      return element && element.remove();
    }, 1000); // Give a little time to properly unmount your previous page before removing the old one
  }

  const {
    Tezos,
    wallet,
    userAddress,
    userBalance,
    storage,
    mainWalletType,
    setStorage,
    setUserAddress,
    setUserBalance,
    setLoading,
    loading,
    refreshStorage,
  } = React.useContext(UserContext) as UserContextType;

  const [newPlayer, setNewPlayer] = useState<address>("" as address);
  const [total_rounds, setTotal_rounds] = useState<nat>(
    new BigNumber(1) as nat
  );
  const [myGames, setMyGames] = useState<Map<nat, Session>>();

  useEffect(() => {
    (async () => {
      if (storage) {
        const myGames = new Map(); //filtering our games
        Array.from(storage.sessions.keys()).forEach((key) => {
          const session = storage.sessions.get(key);

          if (
            session.players.indexOf(userAddress as address) >= 0 &&
            "inplay" in session.result
          ) {
            myGames.set(key, session);
          }
        });
        setMyGames(myGames);
      } else {
        console.log("storage is not ready yet");
      }
    })();
  }, [storage]);

  const createSession = async (
    e: React.MouseEvent<HTMLIonButtonElement, MouseEvent>
  ) => {
    console.log("createSession");
    e.preventDefault();

    try {
      setLoading(true);
      const op = await mainWalletType?.methods
        .createSession(total_rounds, [userAddress as address, newPlayer])
        .send();
      await op?.confirmation();
      const newStorage = await mainWalletType?.storage();
      setStorage(newStorage!);
      setLoading(false);
      dismissCreateGameModal();
      setTimeout(
        () => push(PAGES.SESSION + "/" + storage?.next_session.toString()),
        500
      );
      //it was the id created
      console.log("newStorage", newStorage);
    } catch (error) {
      console.table(`Error: ${JSON.stringify(error, null, 2)}`);
      const tibe: TransactionInvalidBeaconError =
        new TransactionInvalidBeaconError(error);
      presentAlert({
        header: "Error",
        message: tibe.data_message,
        buttons: ["Close"],
      });
      setLoading(false);
    }
    setLoading(false);
  };

  return (
    <IonPage className="container">
      <IonHeader>
        <IonToolbar>
          <IonTitle>Shifumi</IonTitle>
        </IonToolbar>
      </IonHeader>
      <IonContent fullscreen>
        <IonRefresher slot="fixed" onIonRefresh={refreshStorage}>
          <IonRefresherContent></IonRefresherContent>
        </IonRefresher>

        {loading ? (
          <div className="loading">
            <IonItem>
              <IonLabel>Refreshing ...</IonLabel>
              <IonSpinner className="spinner"></IonSpinner>
            </IonItem>
          </div>
        ) : (
          <IonList inset={true}>
            {!userAddress ? (
              <>
                <div
                  style={{
                    display: "flex",
                    flexDirection: "row",
                    padding: "4em",
                    justifyContent: "space-around",
                  }}
                >
                  <IonImg src={Stone} className="logo" />
                  <IonImg src={Paper} className="logo" />
                  <IonImg src={Scissor} className="logo" />
                </div>
                <IonList inset={true}>
                  <ConnectButton
                    Tezos={Tezos}
                    setUserAddress={setUserAddress}
                    setUserBalance={setUserBalance}
                    wallet={wallet}
                  />
                </IonList>
              </>
            ) : (
              <IonList>
                <IonItem style={{ padding: 0, margin: 0 }}>
                  <IonIcon icon={person} />
                  <IonLabel style={{ fontSize: "0.8em", direction: "rtl" }}>
                    {userAddress}
                  </IonLabel>
                </IonItem>
                <IonItem style={{ padding: 0, margin: 0 }}>
                  <IonImg style={{ height: 24, width: 24 }} src={XTZLogo} />
                  <IonLabel style={{ direction: "rtl" }}>
                    {userBalance / 1000000}
                  </IonLabel>
                </IonItem>

                <div
                  style={{
                    display: "flex",
                    flexDirection: "row",
                    paddingTop: "10vh",
                    paddingBottom: "10vh",
                    justifyContent: "space-around",
                    width: "100%",
                  }}
                >
                  <IonImg src={Stone} className="logo" />
                  <IonImg src={Paper} className="logo" />
                  <IonImg src={Scissor} className="logo" />
                </div>

                <IonButton id="createGameModalVisible" expand="full">
                  New game
                </IonButton>
                <IonModal
                  ref={createGameModal}
                  trigger="createGameModalVisible"
                >
                  <IonHeader>
                    <IonToolbar>
                      <IonButtons slot="start">
                        <IonButton onClick={() => dismissCreateGameModal()}>
                          Cancel
                        </IonButton>
                      </IonButtons>
                      <IonTitle>New Game</IonTitle>
                      <IonButtons slot="end">
                        <IonButton
                          strong={true}
                          onClick={(e) => createSession(e)}
                          id="createGameModal"
                        >
                          Create
                        </IonButton>
                      </IonButtons>
                    </IonToolbar>
                  </IonHeader>
                  <IonContent className="ion-padding">
                    <h2>How many total rounds ?</h2>

                    <IonItem key="total_rounds">
                      <IonLabel position="stacked" className="text"></IonLabel>
                      <IonInput
                        onIonChange={(str: any) => {
                          if (str.detail.value === undefined) return;
                          setTotal_rounds(
                            new BigNumber(str.target.value) as nat
                          );
                        }}
                        value={total_rounds.toString()}
                        placeholder="total_rounds"
                        type="number"
                        label="Total Rounds"
                      />
                    </IonItem>

                    <h2>Choose your opponent player</h2>

                    <SelectMembers
                      Tezos={Tezos}
                      member={newPlayer}
                      setMember={setNewPlayer}
                    />

                    <IonItem key="newPlayer">
                      <IonInput
                        onIonChange={(str: any) => {
                          if (str.detail.value === undefined) return;
                          setNewPlayer(str.detail.value as address);
                        }}
                        labelPlacement="floating"
                        class="address"
                        value={newPlayer}
                        placeholder="...tz1"
                        type="text"
                        label="Tezos Address "
                      />
                    </IonItem>
                  </IonContent>
                </IonModal>

                <IonButton id="selectGameModalVisible" expand="full">
                  Join game
                </IonButton>
                <IonModal
                  ref={selectGameModal}
                  trigger="selectGameModalVisible"
                >
                  <IonHeader>
                    <IonToolbar>
                      <IonButtons slot="start">
                        <IonButton onClick={() => dismissSelectGameModal()}>
                          Cancel
                        </IonButton>
                      </IonButtons>
                      <IonTitle>Select Game</IonTitle>
                    </IonToolbar>
                  </IonHeader>
                  <IonContent>
                    <IonList inset={true}>
                      {myGames
                        ? Array.from(myGames.entries()).map(([key, _]) => (
                            <IonButton
                              key={"Game-" + key.toString()}
                              expand="full"
                              routerLink={PAGES.SESSION + "/" + key.toString()}
                              onClick={dismissSelectGameModal}
                            >
                              {"Game n°" + key.toString()}
                            </IonButton>
                          ))
                        : []}
                    </IonList>
                  </IonContent>
                </IonModal>

                <IonButton routerLink={PAGES.TOPPLAYERS} expand="full">
                  Top Players
                </IonButton>
              </IonList>
            )}
          </IonList>
        )}
      </IonContent>
      <IonFooter>
        <IonToolbar>
          <IonTitle>
            <IonButton color="primary" routerLink={PAGES.RULES} expand="full">
              Rules
            </IonButton>
          </IonTitle>
        </IonToolbar>
      </IonFooter>

      {userAddress ? (
        <DisconnectButton
          wallet={wallet}
          setUserAddress={setUserAddress}
          setUserBalance={setUserBalance}
        />
      ) : (
        <></>
      )}
    </IonPage>
  );
};

Explanation :

const createGameModal : The popup to create a new game
const selectGameModal : The popup to select a game to join
const [newPlayer, setNewPlayer] = useState<address>("" as address) : Used on New Game popup form to add an opponent
const [total_rounds, setTotal_rounds] = useState<nat>(new BigNumber(1) as nat) : Used on New Game popup form to set number of round for one game
const [myGames, setMyGames] = useState<Map<nat, Session>>() : Used on Join Game popup window to display the games we have created or we are invited to
Array.from(storage.sessions.keys()).forEach((key) => { ... if (session.players.indexOf(userAddress as address) >= 0 && "inplay" in session.result ... : On storage change event, we fetch and filter only games we can join and play (i.e with inplay status and where user appears on player list)
const createSession = async (...) => { ... const op = await mainWalletType!.methods.createSession([userAddress as address, newPlayer], total_rounds).send(); ... : createSession function will call the Smart contract entrypoint passing on arguments : current user address,opponent address and total rounds, then it will redirect to the newly created game page
{...<IonButton ... routerLink={PAGES.SESSION + "/" + key.toString()} : If you click on a game button from the list it will redirect you to the game to play
SessionScreen.tsx : it is the game page where you can play on limited rounds and where the result of the game will be displayed at the end

import { IonPage } from "@ionic/react";
import React from "react";

export const SessionScreen: React.FC = () => {
  return <IonPage className="container"></IonPage>;
};

We leave it empty for now and we will edit it later and explain what to write

TopPlayersScreen.tsx : it is the player ranking page

import { IonPage } from "@ionic/react";
import React from "react";

export const TopPlayersScreen: React.FC = () => {
  return <IonPage className="container"></IonPage>;
};

We leave it empty for now and edit it later too

Rules.tsx : just some information about game rules

import {
  IonButton,
  IonButtons,
  IonContent,
  IonHeader,
  IonImg,
  IonItem,
  IonList,
  IonPage,
  IonTitle,
  IonToolbar,
} from "@ionic/react";
import React from "react";
import { useHistory } from "react-router-dom";
import Clock from "../assets/clock.webp";
import Legend from "../assets/legend.webp";
import Paper from "../assets/paper-logo.webp";
import Scissor from "../assets/scissor-logo.webp";
import Stone from "../assets/stone-logo.webp";

export const RulesScreen: React.FC = () => {
  const { goBack } = useHistory();

  /* 2. Get the param */
  return (
    <IonPage className="container">
      <IonHeader>
        <IonToolbar>
          <IonButtons slot="start">
            <IonButton onClick={goBack}>Back</IonButton>
          </IonButtons>
          <IonTitle>Rules</IonTitle>
        </IonToolbar>
      </IonHeader>
      <IonContent fullscreen>
        <div style={{ textAlign: "left" }}>
          <IonList>
            <IonItem className="nopm">
              <IonImg src={Stone} className="logo" />
              Stone (Clenched Fist). Rock beats the scissors by hitting it
            </IonItem>
            <IonItem className="nopm">
              <IonImg src={Paper} className="logo" />
              Paper (open and extended hand) . Paper wins over stone by enveloping
              it
            </IonItem>
            <IonItem className="nopm">
              <IonImg src={Scissor} className="logo" />
              Scissors (closed hand with the two fingers) . Scissors wins paper cutting
              it
            </IonItem>

            <IonItem className="nopm">
              <IonImg src={Clock} className="logo" />
              If you are inactive for more than 10 minutes your opponent can claim
              the victory
            </IonItem>

            <IonItem className="nopm">
              <IonImg src={Legend} className="logo" />
              <ul style={{ listStyle: "none" }}>
                <li className="win">Won round</li>
                <li className="lose">Lost round</li>
                <li className="draw">Draw</li>
                <li className="current">Current Round</li>
                <li className="missing">Missing Rounds</li>
              </ul>
            </IonItem>
          </IonList>
        </div>
      </IonContent>
    </IonPage>
  );
};

TransactionInvalidBeaconError.ts the utility class that formats Beacon errors

export class TransactionInvalidBeaconError {
  name: string;
  title: string;
  message: string;
  description: string;
  data_contract_handle: string;
  data_expected_form: string;
  data_message: string;

  /**
      * 
      * @param transactionInvalidBeaconError  {
      "name": "UnknownBeaconError",
      "title": "Aborted",
      "message": "[ABORTED_ERROR]:The action was aborted by the user.",
      "description": "The action was aborted by the user."
  }
  */

  constructor(transactionInvalidBeaconError: any) {
    this.name = transactionInvalidBeaconError.name;
    this.title = transactionInvalidBeaconError.title;
    this.message = transactionInvalidBeaconError.message;
    this.description = transactionInvalidBeaconError.description;
    this.data_contract_handle = "";
    this.data_expected_form = "";
    this.data_message = this.message;
    if (transactionInvalidBeaconError.data !== undefined) {
      let dataArray = Array.from<any>(
        new Map(
          Object.entries<any>(transactionInvalidBeaconError.data)
        ).values()
      );
      let contract_handle = dataArray.find(
        (obj) => obj.contract_handle !== undefined
      );
      this.data_contract_handle =
        contract_handle !== undefined ? contract_handle.contract_handle : "";
      let expected_form = dataArray.find(
        (obj) => obj.expected_form !== undefined
      );
      this.data_expected_form =
        expected_form !== undefined
          ? expected_form.expected_form +
            ":" +
            expected_form.wrong_expression.string
          : "";
      this.data_message =
        (this.data_contract_handle
          ? "Error on contract : " + this.data_contract_handle + " "
          : "") +
        (this.data_expected_form
          ? "error : " + this.data_expected_form + " "
          : "");
    }
  }
}

Step 4 : Test it

To test in web

npm run dev

We consider that your wallet is well configured and has some Tez on Ghostnet, so click on Connect button.

Note : If you don't have tokens, to get some free XTZ on Ghostnet, follow this link to the faucet

On the popup, select your Wallet, then your account and connect.

🎊 You are "logged"

Optional : Click on the Disconnect button to test the logout

Step 5 : Play on a game session

Click on New Game button from Home page and then create a new game Confirm the operation with your wallet

You are redirected the new game session page (that is blank page right now)

Edit the file ./src/SessionScreen.tsx

import {
  IonButton,
  IonButtons,
  IonContent,
  IonFooter,
  IonHeader,
  IonIcon,
  IonImg,
  IonItem,
  IonLabel,
  IonList,
  IonPage,
  IonRefresher,
  IonRefresherContent,
  IonSpinner,
  IonTitle,
  IonToolbar,
  useIonAlert,
} from "@ionic/react";
import { MichelsonV1ExpressionBase, PackDataParams } from "@taquito/rpc";
import { MichelCodecPacker } from "@taquito/taquito";
import { BigNumber } from "bignumber.js";
import * as crypto from "crypto";
import { eye, stopCircle } from "ionicons/icons";
import React, { useEffect, useState } from "react";
import { RouteComponentProps, useHistory } from "react-router-dom";
import { Action, PAGES, UserContext, UserContextType } from "../App";
import { TransactionInvalidBeaconError } from "../TransactionInvalidBeaconError";
import Paper from "../assets/paper-logo.webp";
import Scissor from "../assets/scissor-logo.webp";
import Stone from "../assets/stone-logo.webp";
import { bytes, nat, unit } from "../type-aliases";

export enum STATUS {
  PLAY = "Play !",
  WAIT_YOUR_OPPONENT_PLAY = "Wait for your opponent move",
  REVEAL = "Reveal your choice now",
  WAIT_YOUR_OPPONENT_REVEAL = "Wait for your opponent to reveal his choice",
  FINISHED = "Game ended",
}

type SessionScreenProps = RouteComponentProps<{
  id: string;
}>;

export const SessionScreen: React.FC<SessionScreenProps> = ({ match }) => {
  const [presentAlert] = useIonAlert();
  const { goBack } = useHistory();

  const id: string = match.params.id;

  const {
    Tezos,
    userAddress,
    storage,
    mainWalletType,
    setStorage,
    setLoading,
    loading,
    refreshStorage,
    subReveal,
    subNewRound,
  } = React.useContext(UserContext) as UserContextType;

  const [status, setStatus] = useState<STATUS>();
  const [remainingTime, setRemainingTime] = useState<number>(10 * 60);
  const [sessionEventRegistrationDone, setSessionEventRegistrationDone] =
    useState<boolean>(false);

  const registerSessionEvents = async () => {
    if (!sessionEventRegistrationDone) {
      if (subReveal)
        subReveal.on("data", async (e) => {
          console.log("on reveal event", e, id, UserContext);
          if (
            (!e.result.errors || e.result.errors.length === 0) &&
            (e.payload as MichelsonV1ExpressionBase).int === id
          ) {
            await revealPlay();
          } else
            console.warn(
              "Warning : here we ignore this transaction event for session ",
              id
            );
        });

      if (subNewRound)
        subNewRound.on("data", (e) => {
          if (
            (!e.result.errors || e.result.errors.length === 0) &&
            (e.payload as MichelsonV1ExpressionBase).int === id
          ) {
            console.log("on new round event :", e);
            refreshStorage();
          } else
            console.log("Warning : here we ignore this transaction event", e);
        });

      console.log("registerSessionEvents registered", subReveal, subNewRound);
      setSessionEventRegistrationDone(true);
    }
  };

  const buildSessionStorageKey = (
    userAddress: string,
    sessionNumber: number,
    roundNumber: number
  ): string => {
    return (
      import.meta.env.VITE_CONTRACT_ADDRESS +
      "-" +
      userAddress +
      "-" +
      sessionNumber +
      "-" +
      roundNumber
    );
  };

  const buildSessionStorageValue = (secret: number, action: Action): string => {
    return (
      secret + "-" + (action.cisor ? "cisor" : action.paper ? "paper" : "stone")
    );
  };

  const extractSessionStorageValue = (
    value: string
  ): { secret: number; action: Action } => {
    const actionStr = value.split("-")[1];
    return {
      secret: Number(value.split("-")[0]),
      action:
        actionStr === "cisor"
          ? new Action(true as unit, undefined, undefined)
          : actionStr === "paper"
          ? new Action(undefined, true as unit, undefined)
          : new Action(undefined, undefined, true as unit),
    };
  };

  useEffect(() => {
    if (storage) {
      const session = storage?.sessions.get(new BigNumber(id) as nat);
      console.log(
        "Session has changed",
        session,
        "round",
        session?.current_round.toNumber(),
        "session.decoded_rounds.get(session.current_round)",
        session?.decoded_rounds.get(session?.current_round)
      );
      if (session && ("winner" in session.result || "draw" in session.result)) {
        setStatus(STATUS.FINISHED);
      } else if (session) {
        if (
          session.decoded_rounds &&
          session.decoded_rounds.get(session.current_round) &&
          session.decoded_rounds.get(session.current_round).length === 1 &&
          session.decoded_rounds.get(session.current_round)[0].player ===
            userAddress
        ) {
          setStatus(STATUS.WAIT_YOUR_OPPONENT_REVEAL);
        } else if (
          session.rounds &&
          session.rounds.get(session.current_round) &&
          session.rounds.get(session.current_round).length === 2
        ) {
          setStatus(STATUS.REVEAL);
        } else if (
          session.rounds &&
          session.rounds.get(session.current_round) &&
          session.rounds.get(session.current_round).length === 1 &&
          session.rounds.get(session.current_round)[0].player === userAddress
        ) {
          setStatus(STATUS.WAIT_YOUR_OPPONENT_PLAY);
        } else {
          setStatus(STATUS.PLAY);
        }
      }

      (async () => await registerSessionEvents())();
    } else {
      console.log("Wait parent to init storage ...");
    }
  }, [storage?.sessions.get(new BigNumber(id) as nat)]);

  //setRemainingTime
  useEffect(() => {
    const interval = setInterval(() => {
      const diff = Math.round(
        (new Date(
          storage?.sessions.get(new BigNumber(id) as nat).asleep!
        ).getTime() -
          Date.now()) /
          1000
      );

      if (diff <= 0) {
        setRemainingTime(0);
      } else {
        setRemainingTime(diff);
      }
    }, 1000);

    return () => clearInterval(interval);
  }, [storage?.sessions.get(new BigNumber(id) as nat)]);

  const play = async (action: Action) => {
    const session_id = new BigNumber(id) as nat;
    const current_session = storage?.sessions.get(session_id);
    try {
      setLoading(true);
      const secret = Math.round(Math.random() * 63); //FIXME it should be 654843, but we limit the size of the output hexa because expo-crypto is buggy
      // see https://forums.expo.dev/t/how-to-hash-buffer-with-expo-for-an-array-reopen/64587 or https://github.com/expo/expo/issues/20706 );
      localStorage.setItem(
        buildSessionStorageKey(
          userAddress,
          Number(id),
          storage!.sessions
            .get(new BigNumber(id) as nat)
            .current_round.toNumber()
        ),
        buildSessionStorageValue(secret, action)
      );
      console.log("PLAY - pushing to session storage ", secret, action);
      const encryptedAction = await create_bytes(action, secret);
      console.log(
        "encryptedAction",
        encryptedAction,
        "session_id",
        session_id,
        "current_round",
        current_session?.current_round
      );

      const preparedCall = mainWalletType?.methods.play(
        session_id,
        current_session!.current_round,

        encryptedAction
      );

      const { gasLimit, storageLimit, suggestedFeeMutez } =
        await Tezos.estimate.transfer({
          ...preparedCall!.toTransferParams(),
          amount: 1,
          mutez: false,
        });

      console.log({ gasLimit, storageLimit, suggestedFeeMutez });
      const op = await preparedCall!.send({
        gasLimit: gasLimit * 2, //we take a margin +1000 for an eventual event in case of paralell execution
        fee: suggestedFeeMutez * 2,
        storageLimit: storageLimit,
        amount: 1,
        mutez: false,
      });

      await op?.confirmation();
      const newStorage = await mainWalletType?.storage();
      setStorage(newStorage!);
      setLoading(false);
      console.log("newStorage", newStorage);
    } catch (error) {
      console.table(`Error: ${JSON.stringify(error, null, 2)}`);
      const tibe: TransactionInvalidBeaconError =
        new TransactionInvalidBeaconError(error);
      presentAlert({
        header: "Error",
        message: tibe.data_message,
        buttons: ["Close"],
      });
      setLoading(false);
    }
    setLoading(false);
  };

  const revealPlay = async () => {
    const session_id = new BigNumber(id) as nat;

    //force refresh in case of events
    const storage = await mainWalletType?.storage();

    const current_session = storage!.sessions.get(session_id)!;

    console.warn(
      "refresh storage because events can trigger it outisde react scope ...",
      userAddress,
      current_session.current_round
    );

    //fecth from session storage
    const secretActionStr = localStorage.getItem(
      buildSessionStorageKey(
        userAddress,
        session_id.toNumber(),
        current_session!.current_round.toNumber()
      )
    );

    if (!secretActionStr) {
      presentAlert({
        header: "Internal error",
        message:
          "You lose the session/round " +
          session_id +
          "/" +
          current_session!.current_round.toNumber() +
          " storage, no more possible to retrieve secrets, stop Session please",
        buttons: ["Close"],
      });
      setLoading(false);
      return;
    }

    const secretAction = extractSessionStorageValue(secretActionStr);
    console.log("REVEAL - Fetch from session storage", secretAction);

    try {
      setLoading(true);
      const encryptedAction = await packAction(secretAction.action);

      const preparedCall = mainWalletType?.methods.revealPlay(
        session_id,
        current_session?.current_round!,

        encryptedAction as bytes,
        new BigNumber(secretAction.secret) as nat
      );

      const { gasLimit, storageLimit, suggestedFeeMutez } =
        await Tezos.estimate.transfer(preparedCall!.toTransferParams());

      //console.log({ gasLimit, storageLimit, suggestedFeeMutez });
      const op = await preparedCall!.send({
        gasLimit: gasLimit * 3,
        fee: suggestedFeeMutez * 2,
        storageLimit: storageLimit * 4, //we take a margin in case of paralell execution
      });
      await op?.confirmation();
      const newStorage = await mainWalletType?.storage();
      setStorage(newStorage!);
      setLoading(false);
      console.log("newStorage", newStorage);
    } catch (error) {
      console.table(`Error: ${JSON.stringify(error, null, 2)}`);
      const tibe: TransactionInvalidBeaconError =
        new TransactionInvalidBeaconError(error);
      presentAlert({
        header: "Error",
        message: tibe.data_message,
        buttons: ["Close"],
      });
      setLoading(false);
    }
    setLoading(false);
  };

  /** Pack an action variant to bytes. Same is Pack.bytes()  */
  async function packAction(action: Action): Promise<string> {
    const p = new MichelCodecPacker();
    const actionbytes: PackDataParams = {
      data: action.stone
        ? { prim: "Left", args: [{ prim: "Unit" }] }
        : action.paper
        ? { prim: "Right", args: [{ prim: "Left", args: [{ prim: "Unit" }] }] }
        : {
            prim: "Right",
            args: [{ prim: "Right", args: [{ prim: "Unit" }] }],
          },
      type: {
        prim: "Or",
        annots: ["%action"],
        args: [
          { prim: "Unit", annots: ["%stone"] },
          {
            prim: "Or",
            args: [
              { prim: "Unit", annots: ["%paper"] },
              { prim: "Unit", annots: ["%cisor"] },
            ],
          },
        ],
      },
    };
    return (await p.packData(actionbytes)).packed;
  }

  /** Pack an pair [actionBytes,secret] to bytes. Same is Pack.bytes()  */
  async function packActionBytesSecret(
    actionBytes: bytes,
    secret: number
  ): Promise<string> {
    const p = new MichelCodecPacker();
    const actionBytesSecretbytes: PackDataParams = {
      data: {
        prim: "Pair",
        args: [{ bytes: actionBytes }, { int: secret.toString() }],
      },
      type: {
        prim: "pair",
        args: [
          {
            prim: "bytes",
          },
          { prim: "nat" },
        ],
      },
    };
    return (await p.packData(actionBytesSecretbytes)).packed;
  }

  const stopSession = async () => {
    try {
      setLoading(true);
      const op = await mainWalletType?.methods
        .stopSession(new BigNumber(id) as nat)
        .send();
      await op?.confirmation(2);
      const newStorage = await mainWalletType?.storage();
      setStorage(newStorage!);
      setLoading(false);
      console.log("newStorage", newStorage);
    } catch (error) {
      console.table(`Error: ${JSON.stringify(error, null, 2)}`);
      const tibe: TransactionInvalidBeaconError =
        new TransactionInvalidBeaconError(error);
      presentAlert({
        header: "Error",
        message: tibe.data_message,
        buttons: ["Close"],
      });
      setLoading(false);
    }
    setLoading(false);
  };

  const create_bytes = async (
    action: Action,
    secret: number
  ): Promise<bytes> => {
    const actionBytes = (await packAction(action)) as bytes;
    console.log("actionBytes", actionBytes);
    const bytes = (await packActionBytesSecret(actionBytes, secret)) as bytes;
    console.log("bytes", bytes);

    /* correct implemetation with a REAL library */
    const encryptedActionSecret = crypto
      .createHash("sha512")
      .update(Buffer.from(bytes, "hex"))
      .digest("hex") as bytes;

    console.log("encryptedActionSecret", encryptedActionSecret);
    return encryptedActionSecret;
  };

  const getFinalResult = (): string | undefined => {
    if (storage) {
      const result = storage.sessions.get(new BigNumber(id) as nat).result;
      if ("winner" in result && result.winner === userAddress) return "win";
      if ("winner" in result && result.winner !== userAddress) return "lose";
      if ("draw" in result) return "draw";
    }
  };

  const isDesktop = () => {
    const { innerWidth } = window;
    if (innerWidth > 800) return true;
    else return false;
  };

  return (
    <IonPage className="container">
      <IonHeader>
        <IonToolbar>
          <IonButtons slot="start">
            <IonButton onClick={goBack}>Back</IonButton>
          </IonButtons>
          <IonTitle>Game n°{id}</IonTitle>
        </IonToolbar>
      </IonHeader>
      <IonContent fullscreen>
        <IonRefresher slot="fixed" onIonRefresh={refreshStorage}>
          <IonRefresherContent></IonRefresherContent>
        </IonRefresher>
        {loading ? (
          <div className="loading">
            <IonItem>
              <IonLabel>Refreshing ...</IonLabel>
              <IonSpinner className="spinner"></IonSpinner>
            </IonItem>
          </div>
        ) : (
          <>
            <IonList inset={true} style={{ textAlign: "left" }}>
              {status !== STATUS.FINISHED ? (
                <IonItem className="nopm">Status : {status}</IonItem>
              ) : (
                ""
              )}
              <IonItem className="nopm">
                <span>
                  Opponent :{" "}
                  {storage?.sessions
                    .get(new BigNumber(id) as nat)
                    .players.find((userItem) => userItem !== userAddress)}
                </span>
              </IonItem>

              {status !== STATUS.FINISHED ? (
                <IonItem className="nopm">
                  Round :
                  {Array.from(
                    Array(
                      storage?.sessions
                        .get(new BigNumber(id) as nat)
                        .total_rounds.toNumber()
                    ).keys()
                  ).map((roundId) => {
                    const currentRound: number = storage
                      ? storage?.sessions
                          .get(new BigNumber(id) as nat)
                          .current_round?.toNumber() - 1
                      : 0;
                    const roundwinner = storage?.sessions
                      .get(new BigNumber(id) as nat)
                      .board.get(new BigNumber(roundId + 1) as nat);

                    return (
                      <div
                        key={roundId + "-" + roundwinner}
                        className={
                          !roundwinner && roundId > currentRound
                            ? "missing"
                            : !roundwinner && roundId === currentRound
                            ? "current"
                            : !roundwinner
                            ? "draw"
                            : roundwinner.Some === userAddress
                            ? "win"
                            : "lose"
                        }
                      ></div>
                    );
                  })}
                </IonItem>
              ) : (
                ""
              )}

              {status !== STATUS.FINISHED ? (
                <IonItem className="nopm">
                  {"Remaining time :" + remainingTime + " s"}
                </IonItem>
              ) : (
                ""
              )}
            </IonList>

            {status === STATUS.FINISHED ? (
              <IonImg
                className={"logo-XXL" + (isDesktop() ? "" : " mobile")}
                src={"assets/" + getFinalResult() + ".png"}
              />
            ) : (
              ""
            )}

            {status === STATUS.PLAY ? (
              <IonList lines="none" style={{ marginLeft: "calc(50vw - 70px)" }}>
                <IonItem style={{ margin: 0, padding: 0 }}>
                  <IonButton
                    style={{ height: "auto" }}
                    onClick={() =>
                      play(new Action(true as unit, undefined, undefined))
                    }
                  >
                    <IonImg src={Scissor} className="logo" />
                  </IonButton>
                </IonItem>
                <IonItem style={{ margin: 0, padding: 0 }}>
                  <IonButton
                    style={{ height: "auto" }}
                    onClick={() =>
                      play(new Action(undefined, true as unit, undefined))
                    }
                  >
                    <IonImg src={Paper} className="logo" />
                  </IonButton>
                </IonItem>
                <IonItem style={{ margin: 0, padding: 0 }}>
                  <IonButton
                    style={{ height: "auto" }}
                    onClick={() =>
                      play(new Action(undefined, undefined, true as unit))
                    }
                  >
                    <IonImg src={Stone} className="logo" />
                  </IonButton>
                </IonItem>
              </IonList>
            ) : (
              ""
            )}

            {status === STATUS.REVEAL ? (
              <IonButton onClick={() => revealPlay()}>
                <IonIcon icon={eye} />
                Reveal
              </IonButton>
            ) : (
              ""
            )}
            {remainingTime === 0 && status !== STATUS.FINISHED ? (
              <IonButton onClick={() => stopSession()}>
                <IonIcon icon={stopCircle} />
                Claim victory
              </IonButton>
            ) : (
              ""
            )}
          </>
        )}
      </IonContent>
      <IonFooter>
        <IonToolbar>
          <IonTitle>
            <IonButton routerLink={PAGES.RULES} expand="full">
              Rules
            </IonButton>
          </IonTitle>
        </IonToolbar>
      </IonFooter>
    </IonPage>
  );
};

Explanations :

export enum STATUS {... : This enum is used to guess what is the actual status of the game based on different field values. It gives for connected user the next action to do, and so control the display of the buttons
const subReveal = Tezos.stream.subscribeEvent({tag: "reveal",... : websocket subscription to smartcontract reveal event. When is time to reveal, we can trigger the action from the mobile without asking the user to click on the button
const subNewRound = Tezos.stream.subscribeEvent({tag: "newRound",... : websocket subscription to smartcontract newround event. when a new round is ready, this event notifies the mobile to refresh the current game so the player can play on next round
const buildSessionStorageKey ... : this function is an helper to store on browser storage a unique secret key of the player. This secret is a salt that is added to encrypt the Play action and then to decrypt the Reveal action
const buildSessionStorageValue ... : same as above but for the value stored as a string
const play = async (action: Action) => { ... : Play action. We create a player secret for this Play action randomly Math.round(Math.random() * 63) and store it on the browser storage localStorage.setItem(buildSessionStorageKey(.... Then we pack and ecrypt the Play action calling create_bytes(action, secret), we estimate the cost of the transaction and we add an extra for the event cost mainWalletType!.methods.play(encryptedAction,current_session!.current_round,session_id) ... Tezos.estimate.transfer(...) ... preparedCall.send({gasLimit: gasLimit + 1000, .... We ask 1 XTZ for each player doing a Play action. This money is stacked on the contract and free/dispatched when game is ended. Shifumi game does not take any extra fee by default. Only players win or lose money
const revealPlay = async () => {... : Reveal action. We fetch the secret from localStorage.getItem(..., then we pack the secret action and we reveal what was the secret mainWalletType!.methods.revealPlay(encryptedAction as bytes,new BigNumber(secretAction.secret) as nat,current_session!.current_round,session_id);. We add again some extra gas limit gasLimit: gasLimit * 3. Note on why to increase the gas limit : the reason is because if two players reveal actions are on the same block, the primary estimation of gas made by the wallet will not be enough. The reason is that the execution of the second reveal play action will execute another business logic because the first action will modify the initial state, so the estimation at this time (i.e with this previous state) is no more valid
const getFinalResult : based on some fields, it will give the final Status of the game once is ended. when game is ended the winner will get the money stacked by the loser. In case of draw, stacked money is sent back to the players.
const stopSession = async () => {...: There is a countdown of 10min while inaction. If no player wants to play anymore and the game is unfinished, someone can claim the victory and close the game calling mainWalletType!.methods.stopSession(. The smart contract will look at different configuration to guess if there is someone guilty or it is just a draw because no one want to play anymore. Gains will be sent to the winner or in a case of draw, will be sent back to players

When page refreshed, then you can see the game session :bowtie:

Step 6 : Top player score page

Last step is to see the score of all players

Edit TopPlayersScreen.tsx

import {
  IonButton,
  IonButtons,
  IonCol,
  IonContent,
  IonGrid,
  IonHeader,
  IonImg,
  IonPage,
  IonRefresher,
  IonRefresherContent,
  IonRow,
  IonTitle,
  IonToolbar,
} from "@ionic/react";
import React, { useEffect, useState } from "react";
import { useHistory } from "react-router-dom";
import { UserContext, UserContextType } from "../App";
import Ranking from "../assets/ranking.webp";
import { nat } from "../type-aliases";

export const TopPlayersScreen: React.FC = () => {
  const { goBack } = useHistory();
  const { storage, refreshStorage } = React.useContext(
    UserContext
  ) as UserContextType;

  const [ranking, setRanking] = useState<Map<string, number>>(new Map());

  useEffect(() => {
    (async () => {
      if (storage) {
        const ranking = new Map(); //force refresh
        Array.from(storage.sessions.keys()).forEach((key: nat) => {
          const result = storage.sessions.get(key).result;
          if ("winner" in result) {
            const winner = result.winner;
            let score = ranking.get(winner);
            if (score) score++;
            else score = 1;
            ranking.set(winner, score);
          }
        });

        setRanking(ranking);
      } else {
        console.log("storage is not ready yet");
      }
    })();
  }, [storage]);

  /* 2. Get the param */
  return (
    <IonPage className="container">
      <IonHeader>
        <IonToolbar>
          <IonButtons slot="start">
            <IonButton onClick={goBack}>Back</IonButton>
          </IonButtons>
          <IonTitle>Top Players</IonTitle>
        </IonToolbar>
      </IonHeader>
      <IonContent fullscreen>
        <IonRefresher slot="fixed" onIonRefresh={refreshStorage}>
          <IonRefresherContent></IonRefresherContent>
        </IonRefresher>
        <div style={{ marginLeft: "40vw" }}>
          <IonImg
            src={Ranking}
            className="ranking"
            style={{ height: "10em", width: "5em" }}
          />
        </div>

        <IonGrid fixed={true} style={{ color: "white", padding: "2vh" }}>
          <IonRow
            style={{
              backgroundColor: "var(--ion-color-primary)",
            }}
          >
            <IonCol className="col">Address</IonCol>
            <IonCol size="2" className="col">
              Won
            </IonCol>
          </IonRow>

          {ranking && ranking.size > 0
            ? Array.from(ranking).map(([address, count]) => (
                <IonRow
                  key={address}
                  style={{
                    backgroundColor: "var(--ion-color-secondary)",
                  }}
                >
                  <IonCol className="col tiny">{address}</IonCol>
                  <IonCol size="2" className="col">
                    {count}
                  </IonCol>
                </IonRow>
              ))
            : []}
        </IonGrid>
      </IonContent>
    </IonPage>
  );
};

Explanations :

let ranking = new Map() : we prepare a map to count the score for each winner. Looping of all sessions storage.sessions.keys()).forEach we take only where there is a winner if ("winner" in result)then we increment score if (score) score++;else score = 1 and push it to the map ranking.set(winner, score);

Ok, so we have all pages now. The Game dapp is done ! 😎

Step 7 : Bundle for Android

If you want the Android version of the game, follow below instructions

Note : you need to install Android SDK or iOS stack. Recommendation : Easier to start with Android

To modify the name of your app, open the capacitor.config.json file and change "appId":"dev.marigold.shifumi" and "appName": "Tezos Shifumi" properties

Hack : to build on android, change vite.config.ts to remove global field here

export default defineConfig({
  define: {
    "process.env": process.env,
    //global: {},
  },

Also change the ionic config to move from react to custom type build on ionic.config.json

{
  "name": "shifumi",
  "integrations": {
    "capacitor": {}
  },
  "type": "custom"
}

Stay on the app folder, and prepare Android release Then these lines will copy all to android folder + the images ressources used by the store

ionic capacitor add android
ionic capacitor copy android
npm install -g cordova-res
cordova-res android --skip-config --copy
ionic capacitor sync android
ionic capacitor update android

Open Android Studio and do a Build or Make Project action

Note 1 : in case of broken gradle : ionic capacitor sync android and click on sync on Android studio > build

Note 2 : If you have WSL2 and difficulties to run an emulator on it, I advice you to install Android studio on Windows and build, test and package all on this OS. Push your files on your git repo, and check on .gitignore for android folder that there is no filters on assets. Comment end lines on file app/android/.gitignore
# Cordova plugins for Capacitor
#capacitor-cordova-android-plugins

# Copied web assets
#app/src/main/assets/public

# Generated Config files
#app/src/main/assets/capacitor.config.json
#app/src/main/assets/capacitor.plugins.json
#app/src/main/res/xml/config.xml
and comment also the node_modules and dist at your root project because it will require files from @capacitor and you need to install this libraries
#node_modules/
#/dist
Force it to be included on committed files : git add -f android/app/src/main/assets/ ; git add -f android/capacitor-cordova-android-plugins/ ; git add -f node_modules ; and push to git Then try again Build or Make Project action on Android Studio

Start the emulator of your choice (or a physical device) and click on Run app

I recommend to connect with a web wallet like Kukai (because some mobile wallet does not work on the emulator)

Once connected, you can start a new game

Invite Alice to play, click on the address of the opponent player and enter this on your Android Studio terminal

adb shell input text "tz1VSUr8wwNhLAzempoch5d6hLRiTh8Cjcjb"

then click on Create on top right button Confirm the transaction in Kukai and come back to the app

Perfect, the round is starting !

Now you can run the web version on VScode, connect with alice and play the party with your 2 players

Watch the video here to see how to play a party

Step 8 : Publish your app to Google Play store

To publish your app to Android store, read the Google documentation. You will need a developer account : https://developer.android.com/distribute/console/

It costs 25$ for life (for information : Apple developer account costs 99$/ year ...)

Go to Build > Generate Signed bundle / APK...

Follow the Google instruction to set your keystore, and click next. Watch where your binary is stored and upload it to your Google Play console app

After passing a (long) configuration of your application on Google Play Store and passed all Google validations, your app will be published and everyone can download it on Earth

📍 See Github version and full code here

Training Shifumi (📱 version)

✊ ✋ ✌️ Shifumi 🗻 📄 ✂️

📝 Prerequisites

📜 Smart contract

Step 1 : Clone the repository and start a new Taqueria project

Step 2 : Add initial storage and compile

Step 3 : Deploy to Ghostnet

Mobile app

Step 1 : Install IONIC

Polyfill issues fix

Adaptation for Vite

Step 2 : Edit the default Application file to configure page routing and add the style

Step 3 : Connect / disconnect the wallet

Step 4 : Add missing pages and error utility class

Step 4 : Test it

Step 5 : Play on a game session

Step 6 : Top player score page

Step 7 : Bundle for Android

Step 8 : Publish your app to Google Play store

🌴 Conclusion 🌞