// The Cloud Functions for Firebase SDK to create Cloud Functions and setup triggers.
// The Firebase Admin SDK to access the Firebase Realtime Database.
const functions = require('firebase-functions');
const admin = require('firebase-admin');
const nodemailer = require('nodemailer');
const hash = require('string-hash');
admin.initializeApp(functions.config().firebase);
const supportEmail = encodeURIComponent(functions.config().supportemail.email);
const supportPassword = encodeURIComponent(functions.config().supportemail.password);
const supportMailTransport = nodemailer.createTransport(
    `smtps://${supportEmail}:${supportPassword}@smtp.gmail.com`);

// Initialise a basic user in the database
exports.createUser = functions.auth.user().onCreate(event => {
    const user = event.data;
    return admin.database().ref(`/users/${user.uid}`).update({
        email: user.email,
        credit: 0,
        credit_total: 0,
        joined: Date.now()
    });
});

// Welcome the user and send verification email
exports.welcomeEmail = functions.database.ref('/users/{uid}/email')
    .onCreate(event => {

        const email = event.data.val();
        const uid = event.params.uid

        const url = 'https://us-central1-route-kw.cloudfunctions.net/verifyEmail?uid=' + uid + '&secret=' + (hash(uid) + 666)

        let mailOptions = {
            from: '"ROUTEKW" <support@routekw.com>',
            to: email,
            subject: 'Welcome to ROUTEKW Beta 🛣',
            html: '<p>Please verify your email by clicking <a href="' + url + '">here</a></p><p>If you have not registered for ROUTEKW, you can ignore this email.'
        };
        // send mail with defined transport object
        supportMailTransport.sendMail(mailOptions, (error, info) => {
            if (error) {
                return console.log(error);
            }
        });
    });

// Verify email
exports.verifyEmail = functions.https.onRequest((req, res) => {
    const uid = req.query.uid + ''
    const secret = req.query.secret + ''
    const check = hash(req.query.uid) + 666 + ''

    admin.database().ref('users/' + uid + '/role').once("value").then((snapshot) => {
        if (secret === check && snapshot.val() === 0) {
            admin.database().ref('users/' + uid).update({
                role: 2
            })
            res.redirect(303, 'https://www.routekw.com/');
        } else if (secret === check && snapshot.val() === 1) {
            admin.database().ref('users/' + uid).update({
                role: 10
            })
            res.redirect(303, 'https://www.routekw.com/');
        } else {
            console.log('fooking ell')
            res.redirect(303, 'https://www.routekw.com/404');
        }
    })
});

// Add chosen username to the user and reserve it
exports.reserveUsername = functions.database.ref('/profiles_private/{uid}/username')
    .onCreate(event => {

        const uid = event.params.uid
        const username = event.data.val();
        const lowercaseUsername = username.toLowerCase();

        admin.database().ref('profiles_public/').orderByChild('username_lowercase').equalTo(lowercaseUsername).once('value', snapshot => {
            if (snapshot.val()) {
                admin.database().ref('profiles_private/' + uid + '/username').remove();
            } else {
                admin.database().ref('profiles_public/' + uid).update({
                    username: username,
                    username_lowercase: lowercaseUsername
                })
            }
        })
    });

exports.verifyUsername = functions.database.ref('/profiles_public/{uid}/username')
    .onCreate(event => {

        const uid = event.params.uid
        const username = event.data.val();

        admin.database().ref('users/' + uid + '/role').once('value', snapshot => {

            if (snapshot.val() < 1 || !snapshot.val()) {
                admin.database().ref('users/' + uid).update({
                    role: 1,
                    username: username
                })

            } else {
                admin.database().ref('users/' + uid).update({
                    role: 10,
                    username: username
                })

            }
        })
    });

exports.fakePurchase = functions.database.ref('/purchases/{uid}/user')
    .onCreate(event => {

        const purchaseID = event.params.uid
        const userID = event.data.val();

        event.data.ref.parent.child('course').once('value', snapshot => {
            let courseID = snapshot.val();
            admin.database().ref('admin/month').once('value', nestedSnapshot => {
                let expiryDate = Date.now() + (86400000 * nestedSnapshot.val())

                admin.database().ref('users/' + userID + '/purchases').update({
                    [purchaseID]: true
                })

                admin.database().ref('users/' + userID + '/courses/' + courseID).update({
                    full: expiryDate
                })
            })
        })
    });