//Lib
import { promises as fs } from 'fs';
import path from 'path';
import { authOptions } from '../../../pages/api/auth/[...nextauth]';
import { unstable_getServerSession } from 'next-auth/next';

export default async function handler(req, res) {
    if (req.method == 'GET') {
        //Verify that the user is logged in.
        const session = await unstable_getServerSession(req, res, authOptions);
        if (!session) {
            res.status(401).json({ message: 'You must be logged in.' });
            return;
        }
        try {
            //Read the users file
            //Find the absolute path of the json directory
            const jsonDirectory = path.join(process.cwd(), '/config');
            let usersList = await fs.readFile(
                jsonDirectory + '/users.json',
                'utf8'
            );
            //Parse the usersList
            usersList = JSON.parse(usersList);

            //Verify that the user of the session exists
            const userIndex = usersList
                .map((user) => user.username)
                .indexOf(session.user.name);
            if (userIndex === -1) {
                res.status(400).json({
                    message:
                        'User is incorrect. Please, logout to update your session.',
                });
                return;
            } else {
                //Send the emailAlert bool
                res.status(200).json({
                    emailAlert: usersList[userIndex].emailAlert,
                });
                return;
            }
        } catch (error) {
            //Log for backend
            console.log(error);
            //Log for frontend
            if (error.code == 'ENOENT') {
                res.status(500).json({
                    status: 500,
                    message: 'No such file or directory',
                });
            } else {
                res.status(500).json({
                    status: 500,
                    message: 'API error, contact the administrator',
                });
            }
            return;
        }
    } else {
        res.status(405).json({ message: 'Bad request on API' });
    }
}