Initial: Quizalarm Quiz-Plattform

2026-04-15 21:55:03 +02:00
commit 08b606d5b2
15 changed files with 2345 additions and 0 deletions
@@ -0,0 +1,126 @@
+/**
+ * Normalize text for freitext comparison.
+ * Removes special characters, lowercases, collapses whitespace.
+ * "Villingen-Schwenningen" == "villingen schwenningen" == "villingenschwenningen"
+ */
+function normalizeText(text) {
+    if (!text) return '';
+    return text
+        .toLowerCase()
+        .replace(/[äÄ]/g, 'ae')
+        .replace(/[öÖ]/g, 'oe')
+        .replace(/[üÜ]/g, 'ue')
+        .replace(/ß/g, 'ss')
+        .replace(/[^a-z0-9]/g, '')
+        .trim();
+}
+
+function checkFreitext(userAnswer, correctAnswer) {
+    return normalizeText(userAnswer) === normalizeText(correctAnswer);
+}
+
+function parseCorrectAnswers(question) {
+    const raw = (question['Richtige Antwort'] || '').trim();
+    const typ = (question['Typ'] || 'MC').toLowerCase();
+    if (typ === 'freitext') return [raw];
+    return raw
+        .split(',')
+        .map((s) => s.trim().toUpperCase())
+        .filter(Boolean);
+}
+
+function countOptions(question) {
+    let n = 0;
+    if (question['Antwort A']) n++;
+    if (question['Antwort B']) n++;
+    if (question['Antwort C']) n++;
+    if (question['Antwort D']) n++;
+    return n;
+}
+
+/**
+ * Calculate score for an answer.
+ * @param {object}   question       – Baserow row
+ * @param {string[]} selected       – e.g. ['A','C'] or ['Berlin']
+ * @param {number}   timeRemaining  – seconds left (0 if no timer)
+ * @param {number}   totalTime      – total seconds (0 if binary)
+ * @param {string}   scoringMode    – 'binary' | 'time'
+ * @returns {{ points: number, correct: boolean }}
+ */
+function calculateScore(question, selected, timeRemaining, totalTime, scoringMode) {
+    if (!selected || selected.length === 0) return { points: 0, correct: false };
+
+    // Base points
+    let basis;
+    if (scoringMode === 'time' && totalTime > 0) {
+        const ratio = Math.max(0, Math.min(1, timeRemaining / totalTime));
+        basis = 500 + Math.round(ratio * 500);
+    } else {
+        basis = 1000;
+    }
+
+    const typ = (question['Typ'] || 'MC').toLowerCase();
+    const correctAnswers = parseCorrectAnswers(question);
+
+    // Freitext
+    if (typ === 'freitext') {
+        const ok = checkFreitext(selected[0], correctAnswers[0]);
+        return { points: ok ? basis : 0, correct: ok };
+    }
+
+    // MC / Wahr-Falsch
+    const correctSet = new Set(correctAnswers);
+    const totalCorrect = correctSet.size;
+    const totalIncorrect = countOptions(question) - totalCorrect;
+
+    let rightPicked = 0;
+    let wrongPicked = 0;
+    for (const s of selected) {
+        if (correctSet.has(s.toUpperCase())) rightPicked++;
+        else wrongPicked++;
+    }
+
+    let points = (rightPicked / Math.max(totalCorrect, 1)) * basis;
+    if (totalIncorrect > 0) {
+        points -= (wrongPicked / totalIncorrect) * (basis / 2);
+    }
+    points = Math.max(0, Math.round(points));
+
+    const fullyCorrect = rightPicked === totalCorrect && wrongPicked === 0;
+    return { points, correct: fullyCorrect };
+}
+
+/**
+ * Strip the correct answer from a question before sending to participants.
+ */
+function sanitizeQuestion(question) {
+    const typ = (question['Typ'] || 'MC').toLowerCase();
+    const sanitized = {
+        id: question.id,
+        frage: question['Frage'] || '',
+        typ: question['Typ'] || 'MC',
+        bild: null,
+        antworten: [],
+        kategorie: question['Kategorie'] || '',
+    };
+
+    // Bild (Baserow file field → array of objects)
+    const bild = question['Bild'];
+    if (bild && Array.isArray(bild) && bild.length > 0) {
+        sanitized.bild = bild[0].url;
+    }
+
+    if (typ === 'freitext') {
+        // no options
+    } else {
+        const keys = ['A', 'B', 'C', 'D'];
+        for (const k of keys) {
+            const val = question[`Antwort ${k}`];
+            if (val) sanitized.antworten.push({ key: k, text: val });
+        }
+    }
+
+    return sanitized;
+}
+
+module.exports = { calculateScore, sanitizeQuestion, parseCorrectAnswers, normalizeText };