From f28ac11427019eff92e9aa442a6e8787e26ab302 Mon Sep 17 00:00:00 2001
From: Felix Martin <mail@felixm.de>
Date: Sun, 4 Apr 2021 11:03:09 -0400
Subject: [PATCH] Implement tic-tac-toe with history

---
 public/index.html      |   1 +
 src/App.css            |  38 -----------
 src/App.js             |  25 -------
 src/App.test.js        |   8 ---
 src/index.css          |  55 ++++++++++++---
 src/index.js           | 151 +++++++++++++++++++++++++++++++++++++----
 src/logo.svg           |   1 -
 src/reportWebVitals.js |  13 ----
 src/setupTests.js      |   5 --
 9 files changed, 183 insertions(+), 114 deletions(-)
 delete mode 100644 src/App.css
 delete mode 100644 src/App.js
 delete mode 100644 src/App.test.js
 delete mode 100644 src/logo.svg
 delete mode 100644 src/reportWebVitals.js
 delete mode 100644 src/setupTests.js

diff --git a/public/index.html b/public/index.html
index aa069f2..46f9b51 100644
--- a/public/index.html
+++ b/public/index.html
@@ -9,6 +9,7 @@
       name="description"
       content="Web site created using create-react-app"
     />
+    <link rel="stylesheet" href="https://unpkg.com/purecss@2.0.5/build/pure-min.css" integrity="sha384-G9DpmGxRIF6tpgbrkZVcZDeIomEU22LgTguPAI739bbKytjPE/kHTK5YxjJAAEXC" crossorigin="anonymous">
     <link rel="apple-touch-icon" href="%PUBLIC_URL%/logo192.png" />
     <!--
       manifest.json provides metadata used when your web app is installed on a
diff --git a/src/App.css b/src/App.css
deleted file mode 100644
index 74b5e05..0000000
--- a/src/App.css
+++ /dev/null
@@ -1,38 +0,0 @@
-.App {
-  text-align: center;
-}
-
-.App-logo {
-  height: 40vmin;
-  pointer-events: none;
-}
-
-@media (prefers-reduced-motion: no-preference) {
-  .App-logo {
-    animation: App-logo-spin infinite 20s linear;
-  }
-}
-
-.App-header {
-  background-color: #282c34;
-  min-height: 100vh;
-  display: flex;
-  flex-direction: column;
-  align-items: center;
-  justify-content: center;
-  font-size: calc(10px + 2vmin);
-  color: white;
-}
-
-.App-link {
-  color: #61dafb;
-}
-
-@keyframes App-logo-spin {
-  from {
-    transform: rotate(0deg);
-  }
-  to {
-    transform: rotate(360deg);
-  }
-}
diff --git a/src/App.js b/src/App.js
deleted file mode 100644
index 3784575..0000000
--- a/src/App.js
+++ /dev/null
@@ -1,25 +0,0 @@
-import logo from './logo.svg';
-import './App.css';
-
-function App() {
-  return (
-    <div className="App">
-      <header className="App-header">
-        <img src={logo} className="App-logo" alt="logo" />
-        <p>
-          Edit <code>src/App.js</code> and save to reload.
-        </p>
-        <a
-          className="App-link"
-          href="https://reactjs.org"
-          target="_blank"
-          rel="noopener noreferrer"
-        >
-          Learn React
-        </a>
-      </header>
-    </div>
-  );
-}
-
-export default App;
diff --git a/src/App.test.js b/src/App.test.js
deleted file mode 100644
index 1f03afe..0000000
--- a/src/App.test.js
+++ /dev/null
@@ -1,8 +0,0 @@
-import { render, screen } from '@testing-library/react';
-import App from './App';
-
-test('renders learn react link', () => {
-  render(<App />);
-  const linkElement = screen.getByText(/learn react/i);
-  expect(linkElement).toBeInTheDocument();
-});
diff --git a/src/index.css b/src/index.css
index ec2585e..0e56082 100644
--- a/src/index.css
+++ b/src/index.css
@@ -1,13 +1,50 @@
 body {
-  margin: 0;
-  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen',
-    'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue',
-    sans-serif;
-  -webkit-font-smoothing: antialiased;
-  -moz-osx-font-smoothing: grayscale;
+  font: 14px "Century Gothic", Futura, sans-serif;
+  margin: 20px;
 }
 
-code {
-  font-family: source-code-pro, Menlo, Monaco, Consolas, 'Courier New',
-    monospace;
+ol, ul {
+  padding-left: 30px;
+}
+
+.board-row:after {
+  clear: both;
+  content: "";
+  display: table;
+}
+
+.status {
+  margin-bottom: 10px;
+}
+
+.square {
+  background: #fff;
+  border: 1px solid #999;
+  float: left;
+  font-size: 24px;
+  font-weight: bold;
+  line-height: 34px;
+  height: 34px;
+  margin-right: -1px;
+  margin-top: -1px;
+  padding: 0;
+  text-align: center;
+  width: 34px;
+}
+
+.square:focus {
+  outline: none;
+}
+
+.kbd-navigation .square:focus {
+  background: #ddd;
+}
+
+.game {
+  display: flex;
+  flex-direction: row;
+}
+
+.game-info {
+  margin-left: 20px;
 }
diff --git a/src/index.js b/src/index.js
index ef2edf8..ca2d1bc 100644
--- a/src/index.js
+++ b/src/index.js
@@ -1,17 +1,138 @@
-import React from 'react';
-import ReactDOM from 'react-dom';
-import './index.css';
-import App from './App';
-import reportWebVitals from './reportWebVitals';
+import React from "react";
+import ReactDOM from "react-dom";
+import "./index.css";
 
-ReactDOM.render(
-  <React.StrictMode>
-    <App />
-  </React.StrictMode>,
-  document.getElementById('root')
-);
+function Square(props) {
+  return (
+    <button className="square" onClick={props.onClick}>
+      {props.value}
+    </button>
+  );
+}
 
-// If you want to start measuring performance in your app, pass a function
-// to log results (for example: reportWebVitals(console.log))
-// or send to an analytics endpoint. Learn more: https://bit.ly/CRA-vitals
-reportWebVitals();
+class Board extends React.Component {
+  renderSquare(i) {
+    return (
+      <Square
+        value={this.props.squares[i]}
+        onClick={() => this.props.onClick(i)}
+      />
+    );
+  }
+
+  render() {
+    return (
+      <div>
+        <div className="board-row">
+          {this.renderSquare(0)}
+          {this.renderSquare(1)}
+          {this.renderSquare(2)}
+        </div>
+        <div className="board-row">
+          {this.renderSquare(3)}
+          {this.renderSquare(4)}
+          {this.renderSquare(5)}
+        </div>
+        <div className="board-row">
+          {this.renderSquare(6)}
+          {this.renderSquare(7)}
+          {this.renderSquare(8)}
+        </div>
+      </div>
+    );
+  }
+}
+
+class Game extends React.Component {
+  constructor(props) {
+    super(props);
+    this.state = {
+      history: [{ squares: Array(9).fill(null) }],
+      stepNumber: 0,
+      xIsNext: true,
+    };
+  }
+
+  jumpTo(step) {
+    this.setState({
+      stepNumber: step,
+      xIsNext: step % 2 === 0,
+    });
+  }
+
+  handleClick(i) {
+    const history = this.state.history.slice(0, this.state.stepNumber + 1);
+    const current = history[history.length - 1];
+    const squares = current.squares.slice();
+    if (calculateWinner(squares) || squares[i]) {
+      return;
+    }
+    squares[i] = this.state.xIsNext ? "X" : "O";
+    this.setState({
+      history: history.concat([{ squares: squares }]),
+      stepNumber: history.length,
+      xIsNext: !this.state.xIsNext,
+    });
+  }
+
+  render() {
+    const history = this.state.history;
+    const current = history[this.state.stepNumber];
+    const winner = calculateWinner(current.squares);
+
+    const moves = history.map((step, move) => {
+      const desc = move ? "Go to move #" + move : "Go to game start";
+      return (
+        <li key={move}>
+          <button onClick={() => this.jumpTo(move)}>{desc}</button>
+        </li>
+      );
+    });
+
+    let status;
+    if (winner) {
+      status = "Winner " + winner;
+    } else {
+      status = "Next player: " + (this.state.xIsNext ? "X" : "O");
+    }
+
+    return (
+      <div className="game">
+        <div className="game-board">
+          <Board
+            squares={current.squares}
+            onClick={(i) => this.handleClick(i)}
+          />
+        </div>
+        <div className="game-info">
+          <div>{status}</div>
+          <ol>{moves}</ol>
+        </div>
+      </div>
+    );
+  }
+}
+
+// ========================================
+
+ReactDOM.render(<Game />, document.getElementById("root"));
+
+function calculateWinner(squares) {
+  const lines = [
+    [0, 1, 2],
+    [3, 4, 5],
+    [6, 7, 8],
+    [0, 3, 6],
+    [1, 4, 7],
+    [2, 5, 8],
+    [0, 4, 8],
+    [2, 4, 6],
+  ];
+  for (let i = 0; i < lines.length; i++) {
+    const [a, b, c] = lines[i];
+    if (squares[a] && squares[a] === squares[b] && squares[a] === squares[c]) {
+      return squares[a];
+    }
+  }
+  return null;
+}
diff --git a/src/logo.svg b/src/logo.svg
deleted file mode 100644
index 9dfc1c0..0000000
--- a/src/logo.svg
+++ /dev/null
@@ -1 +0,0 @@
-<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 841.9 595.3"><g fill="#61DAFB"><path d="M666.3 296.5c0-32.5-40.7-63.3-103.1-82.4 14.4-63.6 8-114.2-20.2-130.4-6.5-3.8-14.1-5.6-22.4-5.6v22.3c4.6 0 8.3.9 11.4 2.6 13.6 7.8 19.5 37.5 14.9 75.7-1.1 9.4-2.9 19.3-5.1 29.4-19.6-4.8-41-8.5-63.5-10.9-13.5-18.5-27.5-35.3-41.6-50 32.6-30.3 63.2-46.9 84-46.9V78c-27.5 0-63.5 19.6-99.9 53.6-36.4-33.8-72.4-53.2-99.9-53.2v22.3c20.7 0 51.4 16.5 84 46.6-14 14.7-28 31.4-41.3 49.9-22.6 2.4-44 6.1-63.6 11-2.3-10-4-19.7-5.2-29-4.7-38.2 1.1-67.9 14.6-75.8 3-1.8 6.9-2.6 11.5-2.6V78.5c-8.4 0-16 1.8-22.6 5.6-28.1 16.2-34.4 66.7-19.9 130.1-62.2 19.2-102.7 49.9-102.7 82.3 0 32.5 40.7 63.3 103.1 82.4-14.4 63.6-8 114.2 20.2 130.4 6.5 3.8 14.1 5.6 22.5 5.6 27.5 0 63.5-19.6 99.9-53.6 36.4 33.8 72.4 53.2 99.9 53.2 8.4 0 16-1.8 22.6-5.6 28.1-16.2 34.4-66.7 19.9-130.1 62-19.1 102.5-49.9 102.5-82.3zm-130.2-66.7c-3.7 12.9-8.3 26.2-13.5 39.5-4.1-8-8.4-16-13.1-24-4.6-8-9.5-15.8-14.4-23.4 14.2 2.1 27.9 4.7 41 7.9zm-45.8 106.5c-7.8 13.5-15.8 26.3-24.1 38.2-14.9 1.3-30 2-45.2 2-15.1 0-30.2-.7-45-1.9-8.3-11.9-16.4-24.6-24.2-38-7.6-13.1-14.5-26.4-20.8-39.8 6.2-13.4 13.2-26.8 20.7-39.9 7.8-13.5 15.8-26.3 24.1-38.2 14.9-1.3 30-2 45.2-2 15.1 0 30.2.7 45 1.9 8.3 11.9 16.4 24.6 24.2 38 7.6 13.1 14.5 26.4 20.8 39.8-6.3 13.4-13.2 26.8-20.7 39.9zm32.3-13c5.4 13.4 10 26.8 13.8 39.8-13.1 3.2-26.9 5.9-41.2 8 4.9-7.7 9.8-15.6 14.4-23.7 4.6-8 8.9-16.1 13-24.1zM421.2 430c-9.3-9.6-18.6-20.3-27.8-32 9 .4 18.2.7 27.5.7 9.4 0 18.7-.2 27.8-.7-9 11.7-18.3 22.4-27.5 32zm-74.4-58.9c-14.2-2.1-27.9-4.7-41-7.9 3.7-12.9 8.3-26.2 13.5-39.5 4.1 8 8.4 16 13.1 24 4.7 8 9.5 15.8 14.4 23.4zM420.7 163c9.3 9.6 18.6 20.3 27.8 32-9-.4-18.2-.7-27.5-.7-9.4 0-18.7.2-27.8.7 9-11.7 18.3-22.4 27.5-32zm-74 58.9c-4.9 7.7-9.8 15.6-14.4 23.7-4.6 8-8.9 16-13 24-5.4-13.4-10-26.8-13.8-39.8 13.1-3.1 26.9-5.8 41.2-7.9zm-90.5 125.2c-35.4-15.1-58.3-34.9-58.3-50.6 0-15.7 22.9-35.6 58.3-50.6 8.6-3.7 18-7 27.7-10.1 5.7 19.6 13.2 40 22.5 60.9-9.2 20.8-16.6 41.1-22.2 60.6-9.9-3.1-19.3-6.5-28-10.2zM310 490c-13.6-7.8-19.5-37.5-14.9-75.7 1.1-9.4 2.9-19.3 5.1-29.4 19.6 4.8 41 8.5 63.5 10.9 13.5 18.5 27.5 35.3 41.6 50-32.6 30.3-63.2 46.9-84 46.9-4.5-.1-8.3-1-11.3-2.7zm237.2-76.2c4.7 38.2-1.1 67.9-14.6 75.8-3 1.8-6.9 2.6-11.5 2.6-20.7 0-51.4-16.5-84-46.6 14-14.7 28-31.4 41.3-49.9 22.6-2.4 44-6.1 63.6-11 2.3 10.1 4.1 19.8 5.2 29.1zm38.5-66.7c-8.6 3.7-18 7-27.7 10.1-5.7-19.6-13.2-40-22.5-60.9 9.2-20.8 16.6-41.1 22.2-60.6 9.9 3.1 19.3 6.5 28.1 10.2 35.4 15.1 58.3 34.9 58.3 50.6-.1 15.7-23 35.6-58.4 50.6zM320.8 78.4z"/><circle cx="420.9" cy="296.5" r="45.7"/><path d="M520.5 78.1z"/></g></svg>
\ No newline at end of file
diff --git a/src/reportWebVitals.js b/src/reportWebVitals.js
deleted file mode 100644
index 5253d3a..0000000
--- a/src/reportWebVitals.js
+++ /dev/null
@@ -1,13 +0,0 @@
-const reportWebVitals = onPerfEntry => {
-  if (onPerfEntry && onPerfEntry instanceof Function) {
-    import('web-vitals').then(({ getCLS, getFID, getFCP, getLCP, getTTFB }) => {
-      getCLS(onPerfEntry);
-      getFID(onPerfEntry);
-      getFCP(onPerfEntry);
-      getLCP(onPerfEntry);
-      getTTFB(onPerfEntry);
-    });
-  }
-};
-
-export default reportWebVitals;
diff --git a/src/setupTests.js b/src/setupTests.js
deleted file mode 100644
index 8f2609b..0000000
--- a/src/setupTests.js
+++ /dev/null
@@ -1,5 +0,0 @@
-// jest-dom adds custom jest matchers for asserting on DOM nodes.
-// allows you to do things like:
-// expect(element).toHaveTextContent(/react/i)
-// learn more: https://github.com/testing-library/jest-dom
-import '@testing-library/jest-dom';