var router = require('express').Router(),
    mongoose = require('mongoose'),
    Qcm = mongoose.model('Qcm'),
    QcmCategory = mongoose.model('QcmCategory'),
    QcmQuestion = mongoose.model('QcmQuestion'),
    QcmChoice = mongoose.model('QcmChoice'),
    User = mongoose.model('User');
const auth = require('../auth');

// Preload qcm objects on routes with ':type'
router.param('type', function (req, res, next, type) {
    Qcm.findOne({ name: type })
        .populate('categories')
        .then(qcm => {
            if (!qcm) {
                return res.status(404).json({ errors: { "Not Found": "Le QCM est introuvable ou inexistant." } });
            }
            req.qcm = qcm;
            Promise.all(
                req.qcm.categories.map(category => {
                    return category.populate('questions').then(() => {
                        return Promise.all(
                            category.questions.map(question => question.populate('choices'))
                        ).then(() => {
                            return category;
                        }).catch(next);
                    });
                })
            ).then(() => {
                return next();
            }).catch(next);
        }).catch(next);
});

/**
 * return all qcm
 */
router.get('/', auth.required, function (req, res, next) {
    Promise.all([
        req.payload ? User.findById(req.payload.id) : null
    ]).then(function (results) {
        let user = results[0];
        if (!user) {
            return res.status(401).json({ errors: { "Unauthorized": "autentification requise" } });
        }
        return res.json({ qcm: [] });
    }).catch(next);
});

/**
 * return a qcm
 */
router.get('/type/:type', auth.required, function (req, res, next) {
    Promise.all([
        req.payload ? User.findById(req.payload.id) : null
    ]).then(function (results) {
        let user = results[0];
        if (!user) {
            return res.status(401).json({ errors: { "Unauthorized": "autentification requise" } });
        }
        return res.json({ qcm: req.qcm.toJSONFor() });
    }).catch(next);
});

/**
 * save an array of qcm question choice
 */
router.post('/choices/', auth.required, function (req, res, next) {
    Promise.all([
        req.payload ? User.findById(req.payload.id) : null,
        QcmQuestion
            .findOne({num: req.body.question.num})
            .populate('choices')
            .exec()
    ]).then(async function (results) {
        const user = results[0];
        //let numero = (results[1][0].numero + 1);
        if (!user) {
            return res.status(401).json({ errors: { "Unauthorized": "autentification requise" } });
        }
        if (user.role !== 'Admin') {
            return res.status(403).json({ errors: { "Forbidden": "Vous ne disposez pas des autorisations suffisantes" } });
        }
        const question = results[1];
        if (!question) {
            return res.status(422).json({ errors: { question: "question introuvable" } });
        }
        let choices = [];
        Promise.all(
            req.body.question.choices.map(data => {
                const choiceId = new mongoose.Types.ObjectId();
                const choice = new QcmChoice({ _id: choiceId, index: data.index, libelle: data.libelle, correct: data.correct});
                choices.push(choiceId);
                return choice.save();
            })
        ).then(function () {
            question.choices = [...choices];
            question.save().then(function () {
                QcmQuestion
                    .findOne({num: req.body.question.num})
                    .populate('choices')
                    .exec()
                    .then(function (question) {
                        return res.json({ question: question.toJSONFor() });
                    }).catch(next);
            }).catch(next);
        }).catch(next);
    }).catch(next);
});

/**
 * save an array of qcm category questions
 */
router.post('/questions/', auth.required, function (req, res, next) {
    Promise.all([
        req.payload ? User.findById(req.payload.id) : null,
        QcmCategory
            .findOne({num: req.body.category.num})
            .populate('questions')
            .exec()
    ]).then(async function (results) {
        const user = results[0];
        //let numero = (results[1][0].numero + 1);
        if (!user) {
            return res.status(401).json({ errors: { "Unauthorized": "autentification requise" } });
        }
        if (user.role !== 'Admin') {
            return res.status(403).json({ errors: { "Forbidden": "Vous ne disposez pas des autorisations suffisantes" } });
        }
        const category = results[1];
        if (!category) {
            return res.status(422).json({ errors: { category: "catégorie introuvable" } });
        }
        let questions = [];
        Promise.all(
            req.body.category.questions.map(data => {
                const questionId = new mongoose.Types.ObjectId();
                const question = new QcmQuestion({ _id: questionId, num: data.num, libelle: data.libelle, choices: []});
                questions.push(questionId);
                return question.save();
            })
        ).then(function () {
            category.questions = [...questions];
            category.save().then(function () {
                QcmCategory
                    .findOne({num: req.body.category.num})
                    .populate('questions')
                    .exec()
                    .then(function (category) {
                        return res.json({ category: category.toJSONFor() });
                    }).catch(next);
            }).catch(next);
        }).catch(next);
    }).catch(next);
});

module.exports = router;