const Discord = require('discord.js');
const Hyperswarm = require('hyperswarm');
const crypto = require('hypercore-crypto');
const { Client, GatewayIntentBits, Partials, messageLink } = require("discord.js");
require('dotenv').config()

const client = new Client({
    'intents': [
        GatewayIntentBits.DirectMessages,
        GatewayIntentBits.MessageContent,
        GatewayIntentBits.GuildMessages,
        GatewayIntentBits.Guilds,
        GatewayIntentBits.GuildBans,
        GatewayIntentBits.GuildMessages
    ],
    'partials': [Partials.Channel, Partials.Message, Partials.MessageContent]
});

const topicMap = new Map();
const swarmMap = new Map();

client.on('ready', () => {
    console.log(`Logged in as ${client.user.tag}!`);
});

client.on('messageCreate', msg => {
    if (msg.content.startsWith("!") && !msg.author.bot) {
        const args = msg.content.split(" ");
        const cmd = args.shift().slice(1);

        if (cmd === "current-topic") {
            if (topicMap.has(msg.channel.id)) {
                let topic_obj = topicMap.get(msg.channel.id);
                msg.reply(`The current topic for this channel is: ${topic_obj.topic.toString('hex')}`);
            }
            else {
                msg.reply(`No topic is assigned for this channel`);
            }
        }

        if (cmd === "join-topic") {
            if (!args[0]) {
                msg.reply("Please provide a new topic in hexadecimal format");
                return;
            }
            let topic = crypto.randomBytes(32);
            let channel_id = args[1];
            if (!channel_id) {
                msg.reply("Please provide a channel_id to send this topic's messages")
                return;
            }
            //Check if the given channel_id exists or not.
            if (!client.channels.cache.get(channel_id)) {
                msg.reply("The provided channel id does not exist.");
                return;
            }

            let conns = [];
            if (topicMap.has(channel_id)) {
                topic_obj = topicMap.get(channel_id);
                topic = topic_obj.topic;
                conns = topic_obj.conns;
            }
            else {
                topicMap.set(channel_id, { topic: topic, conns: conns });
            }
            if (!swarmMap.has(topic.toString('hex'))) {
                let swarm = new Hyperswarm();
                swarmMap.set(topic.toString('hex'), swarm);
                // Join the new topic
                swarm.join(topic, {
                    lookup: true,
                    announce: true,
                    timeout: 30000
                });
                swarm.on('connection', (conn, info) => {
                    console.log(`Connected to a peer for topic ${topic.toString('hex')}`);
                    conns.push(conn);
                    conn.on('data', data => {
                        // Send the message from the topic to the Discord channel
                        client.channels.fetch(channel_id).then(channel => channel.send(data.toString()))
                    });
                });
                client.channels.fetch(channel_id).then(channel => {
                    msg.reply(`Successfully joined topic and sending messages to ${channel}`);

                });
            } else {
                let swarm = swarmMap.get(topic.toString('hex'));
                swarm.join(topic, {
                    lookup: true,
                    announce: true,
                    timeout: 30000
                });
                client.channels.fetch(channel_id).then(channel => {
                    msg.reply(`Successfully joined topic and sending messages to ${channel}`);
                });
            }
        }

        if (cmd === "set-topic") {
            let channel_id = msg.channel.id;
            //Check if the given channel_id exists or not.
            if (!client.channels.cache.get(channel_id)) {
                msg.reply("The provided channel id does not exist.");
                return;
            }
            let topic = crypto.randomBytes(32);
            let swarm;
            let conns = [];
            if (topicMap.has(channel_id)) {
                topic_obj = topicMap.get(channel_id);
                conns = topic_obj.conns;
            }
            else {
                topicMap.set(channel_id, { topic: topic, conns: conns });
            }
            if (!swarmMap.has(topic)) {
                swarm = new Hyperswarm();
                swarmMap.set(topic, swarm);
                // Join the new topic
                swarm.join(topic, {
                    lookup: true,
                    announce: true,
                    timeout: 30000
                });
                swarm.on('connection', (conn, info) => {
                    console.log(`Connected to a peer for topic ${topic}`);
                    conns.push(conn);
                    conn.on('data', data => {
                        // Send the message from the topic to the Discord channel
                        client.channels.fetch(channel_id).then(channel => channel.send(data.toString()))
                    });
                });
                client.channels.fetch(channel_id).then(channel => {
                    msg.reply(`Successfully joined topic and sending messages to ${channel}`);

                });
            } else {
                swarm = swarmMap.get(topic);
                swarm.join(topic, {
                    lookup: true,
                    announce: true,
                    timeout: 30000
                });
                client.channels.fetch(channel_id).then(channel => {
                    msg.reply(`Successfully joined topic and sending messages to ${channel}`);
                });
            }
        }
        if (cmd === "leave-topic") {
            let channel_id = msg.channel.id;
            let topic_obj = topicMap.get(channel_id);
            if (topic_obj) {
                topic_obj.swarm.leave(topic_obj.topic);
                topicMap.delete(channel_id);
                return msg.reply(`Successfully left topic ${topic_obj.topic.toString('hex')} for channel ${channel_id}`);
            } else {
                return msg.reply(`No topic is assigned for this channel`);
            }
        }
        if (topicMap.has(msg.channel.id) && !msg.author.bot) {
            let topic_obj = topicMap.get(msg.channel.id);
            let conns = topic_obj.conns;
            for (const conn of conns) {
              conn.write(`${msg.author.username}(Discord): ${msg.content}`);
            }
          }
    }
    
});




client.login(process.env.TOKEN);