const fs = require('fs');
const path = require('path');

function shuffleArray(array) {
    for (let i = array.length - 1; i > 0; i--) {
        const j = Math.floor(Math.random() * (i + 1));
        [array[i], array[j]] = [array[j], array[i]];
    }
}

function processFile(filePath) {
    const data = JSON.parse(fs.readFileSync(filePath, 'utf8'));
    let qCount = 0;
    let ansCounts = {0: 0, 1: 0, 2: 0, 3: 0};

    const processQuestion = (q) => {
        const correctOpt = q.opts[q.ans];
        shuffleArray(q.opts);
        q.ans = q.opts.indexOf(correctOpt);
        ansCounts[q.ans] = (ansCounts[q.ans] || 0) + 1;
        qCount++;
    };

    if (data.sets) {
        data.sets.forEach(set => set.questions.forEach(processQuestion));
    } else if (data.questions) {
        data.questions.forEach(processQuestion);
    }

    fs.writeFileSync(filePath, JSON.stringify(data, null, 2) + '\n', 'utf8');
    console.log(`Processed ${path.basename(filePath)}: ${qCount} questions. Distribution:`, ansCounts);
}

const files = [
    'questions.json',
    'scripts/data/set-dart-dev.json',
    'scripts/data/set-flutter-basic.json',
    'scripts/data/set-flutter-dev.json'
];

files.forEach(f => processFile(path.join(__dirname, '..', f)));