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

const clients = [];
const pingInterval = 120e3;
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 urlClient = createGotClient();

const fetchList = async (list) => {
    const listID = uuidRegex.exec(list)?.[0];
    if (!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 fetchUrlList = async (list) => {
    const { body: listMetaBody, statusCode } = await urlClient(list);
    if (statusCode === 404) {
        throw new Error('List was not found.');
    }

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

    return listMetaBody;
};

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

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

        const chunkCount = banChunks.length;

        for (const [i, chunk] of banChunks.entries()) {
            const currentChunk = i + 1;
            const promises = [];

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

            await Promise.allSettled(promises);

            say(Config.Username, `Chunk ${currentChunk}/${chunkCount} of ${listID} executed successfully on channel ${channel}`);

            if (currentChunk === chunkCount) {
                break;
            }

            await sleep(Config.DelayPerChunk);
        }
    } else {
        const promises = [];

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

        await Promise.allSettled(promises);
    }
};

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

const createTwitchClient = () => 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 say = (channel, message) => {
    getConnection().say(channel, message);
};

if (!Config.IgnorePNSL) {
    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 UserBanError) {
                return console.warn(`Failed to ban user ${error.username} from ${error.channelName}`);
            }
            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 TimeoutError) {
                clients[i].connect();
                return console.error(`Timeout in client ${i} -> ${error.name} || ${error.message} | Trying to reconnect`);
            }
            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, '').trimEnd();
        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 say(channel || channelName, `${clients.filter((i) => i.ready).length} Clients from total of ${clients.length} are operational`);
        }

        if (command === 'quit') {
            process.exit(0);
        }

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

            if (!listID) {
                return say(Config.Username, 'No list ID provided!');
            }

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

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

process
    .on('unhandledRejection', (err) => {
        if (err.name === 'SayError') {
            return;
        }
        console.error(`${chalk.red('[UnhandledRejection]')} || [${err.name}] ${err} - ${err.stack}`);
    })
    .on('uncaughtException', (err) => {
        console.error(`${chalk.red('[UncaughtException]')} || ${err.message}`);
        process.exit(0);
    });