const router = require('express').Router();
const { expressjwt } = require('express-jwt')
const axios = require('axios');
const jwt = require('jsonwebtoken')
const { ResultsModel } = require('./model/results')
const { TOKEN_KEY } = require('./const')

// First page
router.get('/getInfoAboutKazan', (request, response) => {
    const lang = request.query.lang || 'ru'; 
    try {
        const data = require('./json/first/info-about-kazan/success.json'); 
        const translatedData = data[lang] || data['ru']; 
        response.send(translatedData); 
    } catch (error) {
        response.status(500).send({ message: 'Internal server error' }); 
    }
});

router.get('/getNews', (request, response) => {
    const lang = request.query.lang || 'ru';
    try {
        const data = require(`./json/first/news/${lang}/success.json`);
        response.send(data);
    } catch (error) {
        response.status(404).send({ message: 'Language not found' });
    }
})

// Sport page
router.get('/getFirstText', (request, response) => {
    const lang = request.query.lang || 'ru';
    try {
        const data = require('./json/sport/first-text/success.json');
        const translatedData = data[lang] || data['ru']; 
        response.send(translatedData);
    } catch (error) {
        response.status(404).send({ message: 'Language not found' }); 
    }
});

router.get('/getSecondText', (request, response) => {
    const lang = request.query.lang || 'ru';
    try {
        const data = require('./json/sport/second-text/success.json');
        const translatedData = data[lang] || data['ru'];
        response.send(translatedData);
    } catch (error) {
        response.status(404).send({ message: 'Language not found' });
    }
});

router.get('/getSportData', (request, response) => {
    const lang = request.query.lang || 'ru';
    try {
        const data = require(`./json/sport/sport-list/${lang}/success.json`);
        response.send(data);
    } catch (error) {
        response.status(404).send({ message: 'Language not found' });
    }
})

router.get('/getSportQuiz', (request, response) => {
    const lang = request.query.lang || 'ru';
    try {
        const data = require(`./json/sport/quiz/${lang}/success.json`);
        response.send(data);
    } catch (error) {
        response.status(404).send({ message: 'Language not found' });
    }
})

// Places page
router.get('/getPlacesData', (request, response) => {
    const lang = request.query.lang || 'ru';
    try {
        const data = require(`./json/places/${lang}/success.json`);
        response.send(data);
    } catch (error) {
        response.status(404).send({ message: 'Language not found' });
    }
})

// Transport page
router.get('/getInfoAboutTransportPage', (request, response) => {
    const lang = request.query.lang || 'ru';
    try {
        const data = require('./json/transport/info-about-page/success.json');
        const translatedData = data[lang] || data['ru'];
        response.send(translatedData);
    } catch (error) {
        response.status(404).send({ message: 'Language not found' });
    }
})

router.get('/getBus', (request, response) => {
    response.send(require('./json/transport/bus-numbers/success.json'))
})

router.get('/getTral', (request, response) => {
    response.send(require('./json/transport/tral-numbers/success.json'))
})

router.get('/getEvents', (request, response) => {
    response.send(require('./json/transport/events-calendar/success.json'))
})

router.get('/getTripSchedule', (request, response) => {
    const lang = request.query.lang || 'ru';
    try {
        const data = require(`./json/transport/trip-schedule/${lang}/success.json`);
        response.send(data);
    } catch (error) {
        response.status(404).send({ message: 'Language not found' });
    }
})

// History page
router.get('/getHistoryText', (request, response) => {
    const lang = request.query.lang || 'ru';
    try {
        const data = require(`./json/history/text/${lang}/success.json`);
        response.send(data);
    } catch (error) {
        response.status(404).send({ message: 'Language not found' });
    }
})
router.get('/getHistoryList', (request, response) => {
    const lang = request.query.lang || 'ru';
    try {
        const data = require(`./json/history/list/${lang}/success.json`);
        response.send(data);
    } catch (error) {
        response.status(404).send({ message: 'Language not found' });
    }
})

// Education page
router.get('/getInfoAboutEducation', (request, response) => {
    const lang = request.query.lang || 'ru';
    try {
        const data = require('./json/education/text/success.json');
        const translatedData = data[lang] || data['ru'];
        response.send(translatedData);
    } catch (error) {
        response.status(404).send({ message: 'Language not found' });
    }
})
router.get('/getEducationList', (request, response) => {
    const lang = request.query.lang || 'ru';
    try {
        const data = require(`./json/education/cards/${lang}/success.json`);
        response.send(data);
    } catch (error) {
        response.status(404).send({ message: 'Language not found' });
    }
})
router.get('/getInfoAboutKFU', (request, response) => {
    const lang = request.query.lang || 'ru';
    try {
        const data = require('./json/education/kfu/success.json');
        const translatedData = data[lang] || data['ru'];
        response.send(translatedData);
    } catch (error) {
        response.status(404).send({ message: 'Language not found' });
    }
})


// Login
router.post('/entrance', (request, response) => {
    const { email, password } = request.body.entranceData;

    try {
        const users = require('./json/users-information/success.json');
        const user = users.data.find(user => user.email === email && user.password === password);

        if (!user) {
            return response.status(401).send('Неверные учетные данные');
        }

        const responseObject = {
            email: user.email,
        }

        return response.json(responseObject);
    } catch (error) {
        console.error('Ошибка чтения файла:', error);
        response.status(500).send('Внутренняя ошибка сервера');
    }
})

router.post('/registration', async (request, response) => {
    const { email, password, confirmPassword } = request.body.registerData;

    try {
        if (password !== confirmPassword) {
            return response.status(400).send('Пароли не совпадают!');
        }
        const users = require('./json/users-information/success.json');

        const existingUser = users.data.find(user => user.email === email);

        if (existingUser) {
            return response.status(400).send('Пользователь с такой почтой уже существует!');
        }

        return response.json({ email: email });
    } catch (error) {
        console.error('Ошибка регистрации пользователя:', error);
        response.status(500).send('Внутренняя ошибка сервера');
    }
});

router.post('/signin', async (req, res) => {
    const { user } = req.body

    if (!user || !user.token) {
        return res.status(404).json({error : "No user found"});
    }

    const valRes = await axios.get('https://antd-table-v2-backend.onrender.com/api/auth/check',
        {
            headers: {
                'authorization': `Bearer ${user.token}`
            }
        }
    )

    if (valRes.status !== 200) {
        return res.status(401).json({error : "User authorization error"});
    }

    const accessToken = jwt.sign({
        ...JSON.parse(JSON.stringify(user._id)),
    }, TOKEN_KEY, {
        expiresIn: '12h'
    })
    user.token = accessToken;
    res.json(user)
})

router.use(
    expressjwt({
        secret: TOKEN_KEY,
        algorithms: ['HS256'],
        getToken: function fromHeaderOrQuerystring(req) {
            if (req.headers.authorization && req.headers.authorization.split(" ")[0] === "Bearer")
                return req.headers.authorization.split(" ")[1];
            else if (req.query && req.query.token)
                return req.query.token;

            return null;
        }
    })
)

router.get('/getQuizResults/:userId', async (request, response) => {
    const { userId } = request.params;

    try {
        const results = await ResultsModel.findOne({ userId: userId }).exec();
       
        if (!results)
            return response.status(404).send({ message: 'Quiz results not found' });
       
        response.send(results.items);
    } catch (error) {
        response.status(500).send({ message: 'An error occurred while fetching quiz results' });
    }
});

router.post('/addQuizResult', async (request, response) => {
    const { userId, quizId, result } = request.body;
    
    if (!userId || !quizId || !result)
        return response.status(400).send({ message: 'Invalid input data' });
    
    try {
        let userResults = await ResultsModel.findOne({ userId: userId }).exec();
        if (!userResults) {
            userResults = new ResultsModel({ userId, items: [] });
        }
        const itemToOverride = userResults.items.find(item => item.quizId === quizId)
        if (!itemToOverride) {
            userResults.items.push({ quizId, result });
        }
        else {
            itemToOverride.result = result;
        }

        await userResults.save();
       
        response.status(200).send({ message: 'Quiz result added successfully' });
    } catch (error) {
        response.status(500).send({ message: 'An error occurred while adding quiz result' });
    }
});

module.exports = router;