const { Op } = require("sequelize");
const { User, Contact } = require("../db/db");
const { sendTelegramMessage } = require("../telegram");

function TelegramWebhookRoute(req, res) {

    try{
        const messageText = req.body.message.text;
        const telegramID = req.body.message.from.id;
        if (messageText.toLowerCase() == "/covidpositive") {
            userInfected(telegramID, (result) => {
                if(result.saved){
                    sendTelegramMessage(telegramID, "Thanks for informing us. We will notify the people you were in contact with!", ()=>{});
                    informContacts(telegramID, ()=>{});
                }else{
                    sendTelegramMessage(telegramID, "Sorry, something went wrong.", ()=>{});
                }
            });
        }
    }
    catch(e){
        console.log("Could not get Telegram Message");
    }
    

    res.send();
}

function informContacts(telegramID, doneCallback){
    User.findOne({
        where: {
            telegram: telegramID,
        }
    }).then(user => {
        if(user){
            const userRowID = user.id;
            Contact.findAll({
                where: {
                    [Op.or]: [{user: userRowID}, {with: userRowID}],
                }
            })
            .then(result => {
                result.forEach(contact => {
                    const otherPersonID = contact.user == userRowID ? contact.with : contact.user;
                    User.findOne({
                        where: {
                            id: otherPersonID,
                        }
                    }).then(otherPerson => {
                        sendTelegramMessage(otherPerson.telegram, "You're infected.", ()=>{});
                    });
                });
            });
        }
    });

}

function userInfected(telegramID, doneCallback) {
    User.findOne({
        where: {
            telegram: telegramID,
        },
    }).then((user) => {
        if (!user) {
            done({saved: false});
        } else {
            user.isInfected = true;
            user.save().then(result => {
                if(result){
                
                    doneCallback({saved: true});
                }
            }).catch(err=>{doneCallback({saved: false})});
        }
    })
    .catch(err=>{
        doneCallback({saved: false});
    });
}

exports.TelegramWebhookRoute = TelegramWebhookRoute;