import fs from 'fs';
import path from 'path';
import { installDeps } from './common.js';

const SERVER_PORT = 3018;

async function main() {
    installDeps();

    let parentDirectory = process.cwd();
    if (parentDirectory.includes('exam') && !fs.existsSync(path.join(parentDirectory, 'exam'))) {
        parentDirectory = path.join(parentDirectory, '..');
    }

    const indexHtml = fs.readFileSync(path.join(parentDirectory, 'exam', 'index.html'), 'utf8');
    const examTheory = fs.readFileSync(path.join(parentDirectory, 'exam', 'theory.json'), 'utf8');
    let examTheoryData = JSON.parse(examTheory);

    // import express and start the server
    const express = await import('express');
    const app = express.default();
    app.use(express.json());
    app.use(express.urlencoded({ extended: true }));

    app.get('/', (req, res) => {
        res.setHeader('Content-Type', 'text/html');
        res.setHeader('Cache-Control', 'no-cache');
        res.setHeader('Pragma', 'no-cache');
        res.setHeader('Expires', '0');
        res.send(indexHtml);
    });

    app.get('/theory', (req, res) => {
        res.setHeader('Content-Type', 'application/json');
        res.json(examTheoryData);
    });

    app.post('/theory-answer', (req, res) => {
        const questionId = req.body.questionId;
        const answer = req.body.answer;
        const index = examTheoryData.findIndex(q => q.id === questionId);
        if (index !== -1) {
            examTheoryData[index].answer = answer;
            fs.writeFileSync(path.join(parentDirectory, 'exam', 'theory.json'), JSON.stringify(examTheoryData, null, 2));
            res.status(200).json({ success: true });
        } else {
            res.status(404).json({ success: false, error: 'Question not found' });
        }
    });

    const open = await import('open');
    app.listen(SERVER_PORT, () => {
        console.log(`Server is running on port ${SERVER_PORT}`);
        open.default(`http://localhost:${SERVER_PORT}/`);
    });
}

main();