const path = require('path');
const fs = require('fs');
const db = require('./database');

module.exports = app => {
    const methodsPath = path.resolve(__dirname, '../methods');
    const methodsDir = fs.readdirSync(methodsPath);
    const methods = [];

    // Get all methods
    for (let method of methodsDir) {
        if (method.includes('.js'))
            methods.push(method.replace('.js', ''));
    }

    // Auth middleware
    const paths = [];
    for (let method of methods)
        paths.push(`/api/${method}/*`);

    app.use(paths, async function(req, res, next) {
        const token = getToken(req);
        const query = `SELECT at.id, at.userId, eu.email, u.lang, at.ttl, at.created 
                            FROM salix.AccessToken at
                                JOIN account.user u ON u.id = at.userid
                                JOIN account.emailUser eu ON eu.userFk = u.id
                        WHERE at.id = ?`;

        try {
            const auth = await db.findOne(query, [token]);

            if (!auth || isTokenExpired(auth.created, auth.ttl))
                throw new Error('Invalid authorization token');

            const args = Object.assign({}, req.query);
            const props = Object.assign(args, req.body);
            props.authorization = auth.id;

            req.args = props;
            req.args.auth = {
                userId: auth.userId,
                token: auth.id,
                email: auth.email,
                locale: auth.lang
            };

            next();
        } catch (error) {
            next(error);
        }
    });

    function getToken(request) {
        const headers = request.headers;
        const queryParams = request.query;

        return headers.authorization || queryParams.authorization;
    }

    function isTokenExpired(created, ttl) {
        const date = new Date(created);
        const currentDate = new Date();

        date.setSeconds(date.getSeconds() + ttl);

        if (currentDate > date)
            return true;

        return false;
    }

    // Mount methods
    for (let method of methods)
        require(`../methods/${method}`)(app);
};