"use strict";

const express = require('express');
const router = express.Router();
const options = require('../../services/options');
const utils = require('../../services/utils');
const migration = require('../../services/migration');
const SOURCE_ID = require('../../services/source_id');
const auth = require('../../services/auth');
const password_encryption = require('../../services/password_encryption');
const protected_session = require('../../services/protected_session');

router.post('/sync', async (req, res, next) => {
    const timestamp = req.body.timestamp;

    const now = utils.nowTimestamp();

    if (Math.abs(timestamp - now) > 5) {
        res.status(400);
        res.send({ message: 'Auth request time is out of sync' });
    }

    const dbVersion = req.body.dbVersion;

    if (dbVersion !== migration.APP_DB_VERSION) {
        res.status(400);
        res.send({ message: 'Non-matching db versions, local is version ' + migration.APP_DB_VERSION });
    }

    const documentSecret = await options.getOption('document_secret');
    const expectedHash = utils.hmac(documentSecret, timestamp);

    const givenHash = req.body.hash;

    if (expectedHash !== givenHash) {
        res.status(400);
        res.send({ message: "Hash doesn't match" });
    }

    req.session.loggedIn = true;

    res.send({
        sourceId: SOURCE_ID
    });
});

// this is for entering protected mode so user has to be already logged-in (that's the reason we don't require username)
router.post('/protected', auth.checkApiAuth, async (req, res, next) => {
    const password = req.body.password;

    if (!await password_encryption.verifyPassword(password)) {
        res.send({
            success: false,
            message: "Given current password doesn't match hash"
        });

        return;
    }

    const decryptedDataKey = await password_encryption.getDecryptedDataKey(password);

    const protectedSessionId = protected_session.setDataKey(req, decryptedDataKey);

    res.send({
        success: true,
        protectedSessionId: protectedSessionId
    });
});

module.exports = router;