Completed exercise jonasschmedtmann#13: Workout Timer in section 19 of the course

Author: MI-Programmer

10-react-quiz/starter/package-lock.json

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+import { useEffect, useReducer } from "react";
+import Header from "./components/Header/Header";
+import Main from "./components/Main/Main";
+import Loader from "./components/Loader";
+import Error from "./components/Error";
+import StartScreen from "./components/Main/StartScreen";
+import Questions from "./components/Main/Questions";
+import NextButton from "./components/Main/NextButton";
+import Progress from "./components/Main/Progress";
+import FinishScreen from "./components/Main/FinishScreen";
+import Footer from "./components/Main/Footer";
+import Timer from "./components/Main/Timer";
+
+const SECS_PER_QUESTION = 30;
+
+const initialState = {
+  questions: [],
+
+  // "loading", "error", "ready", "active", "finished"
+  status: "loading",
+  index: 0,
+  answer: null,
+  points: 0,
+  highscore: 0,
+  secondsRemaining: null,
+};
+
+const reducer = (state, action) => {
+  switch (action.type) {
+    case "dataReceived":
+      return { ...state, questions: action.payload, status: "ready" };
+    case "dataFailed":
+      return { ...state, status: "error" };
+    case "start":
+      return {
+        ...state,
+        status: "active",
+        secondsRemaining: state.questions.length * SECS_PER_QUESTION,
+      };
+    case "newAnswer": {
+      const question = state.questions.at(state.index);
+
+      return {
+        ...state,
+        answer: action.payload,
+        points:
+          action.payload === question.correctOption
+            ? state.points + question.points
+            : state.points,
+      };
+    }
+    case "nextQuestion":
+      return {
+        ...state,
+        index: state.index + 1,
+        answer: null,
+      };
+    case "finish":
+      return {
+        ...state,
+        status: "finished",
+        highscore:
+          state.points > state.highscore ? state.points : state.highscore,
+      };
+    case "restart":
+      return {
+        ...initialState,
+        questions: state.questions,
+        status: "ready",
+        highscore: state.highscore,
+      };
+    case "tick":
+      return {
+        ...state,
+        secondsRemaining: state.secondsRemaining - 1,
+        status: state.secondsRemaining === 0 ? "finished" : state.status,
+      };
+
+    default:
+      throw new Error("Action unknown");
+  }
+};
+
+const App = () => {
+  const [
+    { questions, status, index, answer, points, highscore, secondsRemaining },
+    dispatch,
+  ] = useReducer(reducer, initialState);
+
+  const numQuestions = questions.length;
+  const maxPossiblePoints = questions.reduce(
+    (prev, curr) => prev + curr.points,
+    0
+  );
+
+  useEffect(() => {
+    fetch("http://localhost:9000/questions")
+      .then((res) => res.json())
+      .then((data) => dispatch({ type: "dataReceived", payload: data }))
+      .catch(() => dispatch({ type: "dataFailed" }));
+  }, []);
+
+  return (
+    <div className="app">
+      <Header />
+
+      <Main>
+        {status === "loading" && <Loader />}
+        {status === "error" && <Error />}
+        {status === "ready" && (
+          <StartScreen numQuestions={numQuestions} dispatch={dispatch} />
+        )}
+        {status === "active" && (
+          <>
+            <Progress
+              index={index}
+              numQuestions={numQuestions}
+              points={points}
+              maxPossiblePoints={maxPossiblePoints}
+              answer={answer}
+            />
+            <Questions
+              question={questions[index]}
+              answer={answer}
+              dispatch={dispatch}
+            />
+            <Footer>
+              <Timer secondsRemaining={secondsRemaining} dispatch={dispatch} />
+              <NextButton
+                dispatch={dispatch}
+                answer={answer}
+                numQuestions={numQuestions}
+                index={index}
+              />
+            </Footer>
+          </>
+        )}
+        {status === "finished" && (
+          <FinishScreen
+            points={points}
+            maxPossiblePoints={maxPossiblePoints}
+            highscore={highscore}
+            dispatch={dispatch}
+          />
+        )}
+      </Main>
+    </div>
+  );
+};
+
+export default App;

10-react-quiz/starter/src (2)/App.css

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+import { useReducer } from "react";
+
+const initialState = { count: 0, step: 1 };
+
+const reducer = (state, action) => {
+  console.log(state, action);
+
+  switch (action.type) {
+    case "dec":
+      return { ...state, count: state.count - state.step };
+    case "inc":
+      return { ...state, count: state.count + state.step };
+    case "setCount":
+      return { ...state, count: action.payload };
+    case "reset":
+      return initialState;
+    case "setStep":
+      return { ...state, step: action.payload };
+    default:
+      throw new Error("Unknown action");
+  }
+
+  // if (action.type === "inc") return state + 1;
+  // if (action.type === "dec") return state - 1;
+  // if (action.type === "setCount") return action.payload;
+};
+
+function DateCounter() {
+  // const [count, setCount] = useState(0);
+  // const [step, setStep] = useState(1);
+
+  const [state, dispatch] = useReducer(reducer, initialState);
+  const { count, step } = state;
+
+  // This mutates the date object.
+  const date = new Date("june 21 2027");
+  date.setDate(date.getDate() + count);
+
+  const dec = function () {
+    dispatch({ type: "dec" });
+
+    // setCount((count) => count - 1);
+    // setCount((count) => count - step);
+  };
+
+  const inc = function () {
+    dispatch({ type: "inc" });
+
+    // setCount((count) => count + 1);
+    // setCount((count) => count + step);
+  };
+
+  const defineCount = function (e) {
+    dispatch({ type: "setCount", payload: Number(e.target.value) });
+
+    // setCount(Number(e.target.value));
+  };
+
+  const defineStep = function (e) {
+    dispatch({ type: "setStep", payload: Number(e.target.value) });
+
+    // setStep(Number(e.target.value));
+  };
+
+  const reset = function () {
+    dispatch({ type: "reset" });
+
+    // setCount(0);
+    // setStep(1);
+  };
+
+  return (
+    <div className="counter">
+      <div>
+        <input
+          type="range"
+          min="0"
+          max="10"
+          value={step}
+          onChange={defineStep}
+        />
+        <span>{step}</span>
+      </div>
+
+      <div>
+        <button onClick={dec}>-</button>
+        <input value={count} onChange={defineCount} />
+        <button onClick={inc}>+</button>
+      </div>
+
+      <p>{date.toDateString()}</p>
+
+      <div>
+        <button onClick={reset}>Reset</button>
+      </div>
+    </div>
+  );
+}
+export default DateCounter;

10-react-quiz/starter/src (2)/App.jsx

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+function Error() {
+  return (
+    <p className="error">
+      <span>💥</span> There was an error fecthing questions.
+    </p>
+  );
+}
+
+export default Error;

10-react-quiz/starter/src (2)/assets/react.svg

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+function Header() {
+  return (
+    <header className='app-header'>
+      <img src='logo512.png' alt='React logo' />
+      <h1>The React Quiz</h1>
+    </header>
+  );
+}
+
+export default Header;

10-react-quiz/starter/src (2)/components/DateCounter.jsx

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+export default function Loader() {
+  return (
+    <div className="loader-container">
+      <div className="loader"></div>
+      <p>Loading questions...</p>
+    </div>
+  );
+}

10-react-quiz/starter/src (2)/components/Error.jsx

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+const FinishScreen = ({ points, maxPossiblePoints, highscore, dispatch }) => {
+  const percentage = Math.ceil((points / maxPossiblePoints) * 100);
+
+  let emoji;
+  if (percentage === 100) emoji = "🥇";
+  if (percentage >= 80 && percentage < 100) emoji = "🎉";
+  if (percentage >= 50 && percentage < 80) emoji = "🙃";
+  if (percentage > 0 && percentage < 50) emoji = "🤨";
+  if (percentage === 0) emoji = "🤦‍♂️";
+
+  return (
+    <>
+      <p className="result">
+        <span>{emoji}</span> You scored <strong>{points}</strong> out of{" "}
+        {maxPossiblePoints} ({percentage}%)
+      </p>
+      <p className="highscore">(Highscore: {highscore} points)</p>
+      <button
+        className="btn btn-ui"
+        onClick={() => dispatch({ type: "restart" })}
+      >
+        Restart quiz
+      </button>
+    </>
+  );
+};
+
+export default FinishScreen;

10-react-quiz/starter/src (2)/components/Header/Header.jsx

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+const Footer = ({ children }) => {
+  return <footer>{children}</footer>;
+};
+
+export default Footer;