/**
 * @author Martin Karkowski
 * @email m.karkowski@zema.de
 * @create date 2018-05-22 12:51:09
 * @modify date 2018-08-13 07:15:19
 * @desc [description]
*/

/** Test Client for testing a MQTT-Server */

import * as mqtt from 'mqtt';

console.log('Client Starting');

const client = mqtt.connect('mqtt://dz-013');

const connectedClients = new Set<string>();
const subscribedTopics = new Map<string, Set<string>>();


function getSubscribed(msg: string) {
    for (const _client of connectedClients) {
        if (msg.includes(_client)) {
            return msg.replace(_client, 'client').match(/(?<=client\s\d+\s).*/g)
        }
    }

    return null;
}

function getUnsubscribed(msg: string) {
    for (const _client of connectedClients) {
        if (msg.includes(_client)) {
            return msg.replace(_client, 'client').match(/(?<=client\s).*/g)
        }
    }

    return null;
}

function display() {
    console.log('---------------------' + (new Date(Date.now())).toISOString() + '---------------------')

    const _connected = new Array<string>();
    connectedClients.forEach(client => _connected.push(client));
    console.log('Connected Clients:\n' + JSON.stringify(_connected, null, 4));

    const _subscribed = new Array<string>();
    for (const [topic, subscribers] of subscribedTopics.entries()) {
        if (subscribers.size > 0) {
            _subscribed.push(topic);
        }
    }

    console.log('Subscribed-Topics:\n' + JSON.stringify(_subscribed, null, 4));
}

client.on('connect', function () {
    /** Define Message */
    client.subscribe('$SYS/broker/log/M/subscribe');
    client.subscribe('$SYS/broker/log/M/unsubscribe');
    client.subscribe('$SYS/broker/log/N');
});

client.on('message', (topic, payload) => {
    /** Convert the Buffer */
    const data = payload.toString();

    /** Create a Content field */
    let content: Array<string> | null = null;

    switch (topic) {
        case '$SYS/broker/log/M/subscribe':
            /** Try to find a connected Client */
            content = getSubscribed(data)
            if (content) {
                content.forEach(value => {
                    if (!subscribedTopics.has(value)) {
                        subscribedTopics.set(value, new Set<string>());
                    }
                    (subscribedTopics.get(value) as Set<string>).add(value)
                });
            }
            display();
            break;
        case '$SYS/broker/log/M/unsubscribe':
            content = getUnsubscribed(data)
            if (content) {
                content.forEach(value => {
                    if (!subscribedTopics.has(value)) {
                        subscribedTopics.set(value, new Set<string>());
                    }
                    (subscribedTopics.get(value) as Set<string>).delete(value)
                });
            }
            display();
            break;
        case '$SYS/broker/log/N':
            content = data.match(/(?<=Socket error on client ).*(?=, disconnecting)/g);
            if (content) {
                content.forEach(value => {
                    connectedClients.delete(value);

                    /** Delete the Susbcriber */
                    for (const _subscribers of subscribedTopics.values()) {
                        _subscribers.delete(value);
                    }
                });
                display();
                break;
            }

            /** Regular Expression to Match disconnected */
            content = data.match(/(?<=Client\s).*(?=\sdisconnected)/g);
            if (content) {
                content.forEach(value => {
                    connectedClients.delete(value);

                    /** Delete the Susbcriber */
                    for (const _subscribers of subscribedTopics.values()) {
                        _subscribers.delete(value);
                    }

                });
                display();
                break;
            }


            /** Regular Expression to Match connected clients */
            content = data.match(/(?<=as\s).*(?=\s\()/g)
            if (content) {
                content.forEach(value => connectedClients.add(value));
                display();
                break;
            }

            break;
    }
})