315 lines
11 KiB
TypeScript
315 lines
11 KiB
TypeScript
"use client";
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/**
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* Taking a quiz: an introduction, then one question at a time, then your
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* result.
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*
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* Each question is fetched from the BFF as you reach it, and the BFF starts
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* its clock at that moment — so response times are measured server-side and
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* reloading the page doesn't restart them. Correct answers are only revealed
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* on the results screen, never while you're still answering.
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*
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* Tapping an option only selects it; the answer is sent, and becomes final,
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* when you press Submit. Multi questions ("select all that apply") take
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* several selections.
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*
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* Signed in only: visitors get the sign-in modal over the page, and home if
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* they dismiss it. Nothing about the quiz loads until they're signed in.
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*/
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import { useCallback, useEffect, useState } from "react";
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import Link from "next/link";
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import {
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ArrowLeft,
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ArrowRight,
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Check,
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ClipboardCheck,
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Loader2,
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} from "lucide-react";
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import { toast } from "sonner";
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import { useAuthGate } from "@/components/auth/auth-gate";
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import { useSignedInPage } from "@/components/auth/use-signed-in-page";
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import { RichText } from "@/lib/rich-text";
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import {
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quiz as quizApi,
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quizActionLabel,
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QuizError,
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type QuizCard,
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type QuizPlay,
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type QuizResult,
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} from "@/lib/quiz";
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import { QuizResultView } from "@/components/quiz/quiz-result-view";
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import { CopyPageLinkButton } from "@/components/layout/copy-page-link-button";
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import { cn } from "@/lib/utils";
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type Stage =
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| { kind: "loading" }
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| { kind: "intro"; card: QuizCard }
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| { kind: "playing"; card: QuizCard; play: QuizPlay }
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| { kind: "result"; card: QuizCard; result: QuizResult }
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| { kind: "missing" };
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export function QuizPlayer({ id }: { id: string }) {
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const { user } = useSignedInPage();
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const userId = user?.id;
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const { requireAuth } = useAuthGate();
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const [stage, setStage] = useState<Stage>({ kind: "loading" });
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const [selected, setSelected] = useState<string[]>([]);
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const [submitting, setSubmitting] = useState(false);
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// Every new question starts with nothing selected.
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const goTo = (card: QuizCard, play: QuizPlay) => {
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setSelected([]);
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setStage({ kind: "playing", card, play });
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};
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const toggle = (play: QuizPlay, optionId: string) => {
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if (submitting) return;
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setSelected((cur) =>
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play.question?.multi
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? cur.includes(optionId)
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? cur.filter((x) => x !== optionId)
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: [...cur, optionId]
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: [optionId],
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);
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};
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const showResult = useCallback(
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async (card: QuizCard) => {
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const result = await quizApi.result(id);
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setStage({ kind: "result", card, result });
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},
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[id],
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);
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useEffect(() => {
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if (!userId) return;
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let cancelled = false;
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quizApi
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.get(id)
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.then(async (card) => {
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if (cancelled) return;
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if (card.my.state === "completed") await showResult(card);
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else setStage({ kind: "intro", card });
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})
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.catch(() => !cancelled && setStage({ kind: "missing" }));
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return () => {
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cancelled = true;
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};
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// user?.id: progress appears once you sign in.
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}, [id, userId, showResult]);
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const begin = async (card: QuizCard) => {
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if (!(await requireAuth())) return;
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try {
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const play = await quizApi.start(id);
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if (play.done) await showResult(card);
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else goTo(card, play);
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} catch (err) {
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toast.error(
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err instanceof QuizError ? err.message : "Could not start the quiz",
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);
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}
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};
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const submit = async (card: QuizCard, play: QuizPlay) => {
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if (!play.question || submitting || selected.length === 0) return;
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setSubmitting(true);
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try {
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const next = await quizApi.answer(id, play.question.id, selected);
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if (next.done) await showResult(card);
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else goTo(card, next);
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} catch (err) {
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// Most likely the question was already answered in another tab: pick up
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// wherever the attempt actually is rather than leaving this one stuck.
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toast.error(
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err instanceof QuizError ? err.message : "Could not save that answer",
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);
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try {
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const resumed = await quizApi.start(id);
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if (resumed.done) await showResult(card);
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else goTo(card, resumed);
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} catch {
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/* the toast already said something went wrong */
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}
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} finally {
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setSubmitting(false);
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}
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};
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return (
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<main className="mx-auto w-full max-w-2xl flex-1 px-4 py-6 sm:px-6 sm:py-10">
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<Link
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href="/quizzes"
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className="mb-4 inline-flex items-center gap-1 text-sm text-muted-foreground hover:text-foreground"
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>
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<ArrowLeft className="size-4" /> All quizzes
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</Link>
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{stage.kind === "loading" && (
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<p className="text-sm text-muted-foreground">Loading…</p>
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)}
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{stage.kind === "missing" && (
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<p className="text-sm text-muted-foreground">
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This quiz isn't available.
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</p>
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)}
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{(stage.kind === "intro" ||
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stage.kind === "playing" ||
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stage.kind === "result") && (
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<header className="mb-6">
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<h1 className="font-[family-name:var(--font-title)] text-2xl font-semibold text-foreground">
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{stage.card.title}
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</h1>
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{stage.card.target_path && (
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<Link
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href={stage.card.target_path}
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className="mt-1 inline-block text-sm text-primary hover:underline"
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>
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{stage.card.target_title || stage.card.target_path}
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</Link>
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)}
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{/* Shares the quiz itself; the link unfurls with its own OG card. */}
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<div className="mt-3">
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<CopyPageLinkButton label="Copy quiz link" />
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</div>
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</header>
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)}
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{stage.kind === "intro" && (
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<section className="space-y-5 rounded-2xl border border-border bg-card p-5">
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{stage.card.description && (
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<div className="text-sm leading-relaxed text-foreground">
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<RichText text={stage.card.description} />
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</div>
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)}
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<p className="text-sm text-muted-foreground">
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{stage.card.question_count}{" "}
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{stage.card.question_count === 1 ? "question" : "questions"}, one
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attempt. Each answer is final once submitted, and your time on each
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question is recorded.
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</p>
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{stage.card.my.state === "in_progress" && (
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<p className="text-sm text-muted-foreground">
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You've answered {stage.card.my.answered} of{" "}
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{stage.card.my.total}.
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</p>
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)}
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<button
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type="button"
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onClick={() => void begin(stage.card)}
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className="inline-flex items-center gap-2 rounded-lg bg-primary px-4 py-2 text-sm font-medium text-primary-foreground hover:bg-primary/90 dark:text-white"
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>
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<ClipboardCheck className="size-4" />
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{user
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? quizActionLabel(stage.card.my.state)
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: "Sign in to take the quiz"}
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</button>
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</section>
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)}
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{stage.kind === "playing" && stage.play.question && (
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<section className="space-y-5">
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<div>
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<div className="mb-1.5 flex justify-between text-xs text-muted-foreground">
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<span>
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Question {stage.play.answered + 1} of {stage.play.total}
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</span>
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</div>
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<div className="h-1.5 overflow-hidden rounded-full bg-muted">
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<div
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className="h-full rounded-full bg-primary transition-all"
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style={{
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width: `${(stage.play.answered / stage.play.total) * 100}%`,
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}}
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/>
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</div>
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</div>
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<div>
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<p className="text-lg leading-relaxed text-foreground">
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<RichText text={stage.play.question.prompt} />
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</p>
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<p className="mt-1 text-xs text-muted-foreground">
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{stage.play.question.multi
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? "Select all that apply"
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: "Select one answer"}
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</p>
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</div>
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<ul
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className="space-y-2"
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role={stage.play.question.multi ? "group" : "radiogroup"}
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>
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{stage.play.question.options.map((o) => {
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const on = selected.includes(o.id);
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const multi = stage.play.question?.multi;
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return (
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<li key={o.id}>
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<button
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type="button"
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role={multi ? "checkbox" : "radio"}
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aria-checked={on}
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disabled={submitting}
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onClick={() => toggle(stage.play, o.id)}
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className={cn(
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"flex w-full items-center gap-3 rounded-xl border px-4 py-3 text-left text-sm transition-colors",
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on
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? "border-primary bg-primary/10"
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: "border-border bg-card hover:border-primary/40 hover:bg-muted/40",
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"disabled:cursor-default",
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)}
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>
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{/* Radio dot for one answer, checkbox for several. */}
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<span
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aria-hidden
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className={cn(
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"flex size-4 shrink-0 items-center justify-center border transition-colors",
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multi ? "rounded" : "rounded-full",
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on
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? "border-primary bg-primary text-primary-foreground"
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: "border-muted-foreground/40",
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)}
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>
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{on &&
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(multi ? (
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<Check className="size-3" strokeWidth={3} />
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) : (
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<span className="size-1.5 rounded-full bg-primary-foreground" />
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))}
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</span>
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<span className="min-w-0 flex-1">
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<RichText text={o.body} />
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</span>
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</button>
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</li>
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);
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})}
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</ul>
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<div className="flex justify-end">
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<button
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type="button"
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disabled={selected.length === 0 || submitting}
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onClick={() => void submit(stage.card, stage.play)}
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className="inline-flex items-center gap-2 rounded-lg bg-primary px-5 py-2 text-sm font-medium text-primary-foreground hover:bg-primary/90 disabled:opacity-50 dark:text-white"
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>
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{submitting && <Loader2 className="size-4 animate-spin" />}
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{stage.play.answered + 1 === stage.play.total
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? "Submit and finish"
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: "Next question"}
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{!submitting && stage.play.answered + 1 < stage.play.total && (
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<ArrowRight className="size-4" />
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)}
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</button>
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</div>
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</section>
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)}
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{stage.kind === "result" && <QuizResultView result={stage.result} />}
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</main>
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);
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}
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