const uaParser = require('ua-parser-js');
const {geoip} = require('./geoIP');

let debug = process.env.debug === "1" || false;
const IDENTITIES = {agent: 'agent', session: 'session'};
const EVENTS_DEFINITION = {
    listen: {UPDATE_EVENT: "UPDATE_SESSION"}
};
EVENTS_DEFINITION.emit = {
    NEW_AGENT: "NEW_AGENT",
    NO_AGENTS: "NO_AGENT",
    AGENT_DISCONNECT: "AGENT_DISCONNECTED",
    AGENTS_CONNECTED: "AGENTS_CONNECTED",
    NO_SESSIONS: "SESSION_DISCONNECTED",
    SESSION_ALREADY_CONNECTED: "SESSION_ALREADY_CONNECTED",
    SESSION_RECONNECTED: "SESSION_RECONNECTED",
    UPDATE_EVENT: EVENTS_DEFINITION.listen.UPDATE_EVENT
};

const BASE_sessionInfo = {
    "pageTitle": "Page",
    "active": false,
    "live": true,
    "sessionID": "0",
    "metadata": {},
    "userID": "",
    "userUUID": "",
    "projectKey": "",
    "revID": "",
    "timestamp": 0,
    "trackerVersion": "",
    "isSnippet": true,
    "userOs": "",
    "userBrowser": "",
    "userBrowserVersion": "",
    "userDevice": "",
    "userDeviceType": "",
    "userCountry": "",
    "projectId": 0
};


const extractSessionInfo = function (socket) {
    if (socket.handshake.query.sessionInfo !== undefined) {
        debug && console.log("received headers");
        debug && console.log(socket.handshake.headers);
        socket.handshake.query.sessionInfo = JSON.parse(socket.handshake.query.sessionInfo);
        socket.handshake.query.sessionInfo = {...BASE_sessionInfo, ...socket.handshake.query.sessionInfo};

        let ua = uaParser(socket.handshake.headers['user-agent']);
        socket.handshake.query.sessionInfo.userOs = ua.os.name || null;
        socket.handshake.query.sessionInfo.userBrowser = ua.browser.name || null;
        socket.handshake.query.sessionInfo.userBrowserVersion = ua.browser.version || null;
        socket.handshake.query.sessionInfo.userDevice = ua.device.model || null;
        socket.handshake.query.sessionInfo.userDeviceType = ua.device.type || 'desktop';
        socket.handshake.query.sessionInfo.userCountry = null;
        if (geoip() !== null) {
            debug && console.log(`looking for location of ${socket.handshake.headers['x-forwarded-for'] || socket.handshake.address}`);
            try {
                let ip = socket.handshake.headers['x-forwarded-for'] || socket.handshake.address;
                ip = ip.split(",")[0];
                let country = geoip().country(ip);
                socket.handshake.query.sessionInfo.userCountry = country.country.isoCode;
            } catch (e) {
                debug && console.log("geoip-country failed");
                debug && console.log(e);
            }
        }
    }
}


module.exports = {
    extractSessionInfo, EVENTS_DEFINITION, IDENTITIES
};