const {extend: createGotClient} = require('got');
const {ConnectionError, SayError, PingTimeoutError, ChatClient} = require('dank-twitch-irc');
const chalk = require('chalk');
const WS = require('ws');
const Config = require('./config.json');

const clients = [];
const banChunks = [];
const pingInterval = 60e3;
let lastIndex = 0;
const uuidRegex = /^[0-9A-F]{8}-[0-9A-F]{4}-[4][0-9A-F]{3}-[89AB][0-9A-F]{3}-[0-9A-F]{12}$/i;
const msgRegex = /[\u034f\u2800\u{E0000}\u180e\ufeff\u2000-\u200d\u206D]/gu;

const pnslClient = createGotClient({
    prefixUrl: 'https://bot.tetyys.com/api/v1',
    throwHttpErrors: false,
    headers: {
        'Authorization': `Bearer ${Config.PNSLToken}`,
    },
});

const fetchList = async (listID) => {
    if (!uuidRegex.test(listID)) {
        throw new Error('Invalid List ID!');
    }

    const {body: listMetaBody, statusCode} = await pnslClient('BotLists/Properties', {searchParams: {Guid: listID}});
    if (statusCode === 404) {
        throw new Error('List was not found.');
    }

    if (statusCode === 401) {
        throw new Error('Authorization token is invalid');
    }

    if (statusCode !== 200) {
        throw new Error('Unexpected error occurred!');
    }

    const {body: listData} = await pnslClient(`BotLists/${listID}`);

    const listMeta = JSON.parse(listMetaBody);
    return {listMeta, listData};
};

const runList = async (listData, listID, channel) => {
    const banArr = listData.split('\n');

    if (banArr.length > Config.MaxChunkSize) {
        while (banArr.length > 0) {
            banChunks.push(banArr.splice(0, Config.MaxChunkSize));
        }

        for (const [i, chunk] of banChunks.entries()) {
            const promises = [];

            for (const entry of chunk) {
                if (entry === '') continue;
                [, user, ...reason] = entry.split(' ');
                promises.push(getConnection().ban(channel, user, reason.join(' ')));
            }

            await Promise.allSettled(promises);

            banChunks.shift();

            if (banChunks.length === 0) {
                break;
            }

            clients[0].say(Config.Username, `Chunk ${Number(i) + 1} of ${listID} executed successfully on channel ${channel}`);
            await sleep(Config.DelayPerChunk);
        }
    } else {
        const promises = [];

        for (const entry of banArr) {
            if (entry === '') continue;
            [, user, ...reason] = entry.split(' ');
            promises.push(getConnection().ban(channel, user, reason.join(' ')));
        }

        await Promise.allSettled(promises);
    }
};

const sleep = (ms) => {
    return new Promise((resolve) => setTimeout(resolve, ms));
};

const createTwitchClient = () => {
    return new ChatClient({
        username: Config.Username,
        password: Config.Password,
        rateLimits: 'verifiedBot',
    });
};

const getConnection = () => {
    const readyClients = clients.filter((i) => i.ready);
    return readyClients[++lastIndex % readyClients.length];
};

const pnslWebSocket = new WS('wss://bot.tetyys.com/api/wss', [], {headers: {Authorization: `Bearer ${Config.PNSLToken}`}});

pnslWebSocket.on('open', () => {
    console.log(`${chalk.green('[P&SL]')} || Connected to P&SL Websocket server`);
});

pnslWebSocket.on('message', async (data) => {
    const {o: type, p: payload} = JSON.parse(data);
    switch (type) {
    case 0: {
        const {listMeta} = await fetchList(payload.LatestBotList);
        console.log(`${chalk.green('[P&SL]')} || Latest Botlist: ${payload.LatestBotList} [${listMeta.name}] (${listMeta.count})`);
        break;
    }
    case 1: {
        console.log(`${chalk.green('[P&SL]')} || New Botlist: ${payload.Guid} [${payload.Name}] (${payload.Count}) (${payload.Tags.join(' ')})`);
        break;
    }
    case 2: {
        console.log(`${chalk.green('[P&SL]')} || New False Positive: ${payload.UserTwitchId} [${payload.BotListGuid}]`);
        break;
    }

    default:
        break;
    }
});

(async () => {
    await Promise.all([...Array(Config.MaxConnections)].map(async (_, i) => {
        clients[i] = createTwitchClient();
        clients[i].connect();
        clients[i].on('ready', async () => {
            await clients[i].join(Config.Username);
        });
        clients[i].on('error', (error) => {
            if (error instanceof SayError) return;
            if (error instanceof ConnectionError) {
                if (clients[i].ready) {
                    return;
                }
                clients[i].connect();
                return console.error(`Error in client ${i} -> ${error.name} || ${error.message}`);
            }
            if (error instanceof PingTimeoutError) {
                clients[i].connect();
                return console.error(`Ping Error in client ${i} -> ${error.name} || ${error.message}`);
            }
            console.error(error);
        });
        return await new Promise((resolve) => clients[i].on('ready', () => resolve()));
    }));

    console.log(`${chalk.green('[TWITCH]')} || ${clients.filter((i) => i.ready).length} Clients connected`);

    clients[0].on('PRIVMSG', async ({messageText, senderUserID, channelName}) => {
        if (!Config.Users.includes(senderUserID)) return;

        const message = messageText.replace(msgRegex, '').trimRight();
        if (!message.startsWith(Config.Prefix)) return;
        const content = message.split(/\s+/g);
        const command = content[0].slice(Config.Prefix.length);
        const args = content.slice(1);

        if (command === 'ping') {
            const channel = args[0];
            return clients[0].say(channel || channelName, `${clients.filter((i) => i.ready).length} Clients from total of ${clients.length} are operational`);
        }

        if (command === 'runlist') {
            const listID = args[0];
            const channel = args[1];

            if (!listID) return clients[0].say(Config.Username, 'No list ID provided!');

            try {
                if (channel) {
                    const mods = await clients[0].getMods(channel);
                    if (!mods.includes(Config.Username)) return clients[0].say(Config.Username, `I am not a moderator in channel ${channel}!`);
                }
                const data = await fetchList(listID);
                await runList(data.listData, listID, channel || channelName);
                clients[0].say(Config.Username, `List ${listID} executed successfully on channel ${channel || channelName}`);
            } catch (error) {
                console.error(error);
                return clients[0].say(Config.Username, `Error Occurred! ${error.message}`);
            }
        }
    });

    setInterval(() => {
        for (const client of clients) {
            client.ping();
        }
    }, pingInterval);
})();