import express from 'express';
import axios from 'axios';
import bodyParser from 'body-parser';
import cmd from 'cmd-promise';
import cors from 'cors';
import cheerio from 'cheerio';
import 'dotenv/config';
import llamaTokenizer from 'llama-tokenizer-js';

const prompt = `
You are a security AI responsible for analyzing web traffic from NGINX logs and blocking malicious IPs. Your task is to review the logs for potential attacks and issues. If you identify a verified problem, include [ALERT] followed by a detailed description of the issue in your response. Ensure your message is formatted in Markdown compatible with Discord.

**Guidelines:**
- Domains on the server: shells.lol, hehe.rest, dcord.rest, nodejs.lol, dht.rest, my-mc.link, ssh.surf, tcp.quest
- Use emojis to enhance communication.
- Do not report IP addresses for scraping or crawling.
- Ignore IPs: x.x.x.x, x.x.x.x, x.x.x.x, x.x.x.x. Do not mention these in reports.
- Ignore IP addresses with BOGONs such as 192.168.0.1 or 127.0.0.2, etc.
- Avoid alerting for false positives or irregular activity.
- If there are no alerts but you have interesting findings, write: GENERAL followed by your insights in Markdown.
- Only send GENERAL messages for noteworthy events, not for routine traffic reports.
- In a GENERAL message, feel free to provide a long explainer on your deductions.
- Be decisive. If an IP is being malicious, block it. Do not monitor IPs for further traffic.
- Do not ban an IP address without a corresponding log entry, provide this in your response.
- Block all bot IPs and information scanners except Google.
- Provide proof and reasoning for each ban.
- DO NOT BAN AN IP THAT IS NOT IN A LOG EVER! YOU MUST SEE THE IP ADDRESS!
- To ban an IP or flag it as a security risk, wrap it in a Markdown spoiler: ||IPHERE||
`;

const app = express();
const port = 3001;

app.use(cors()); // Enable CORS for all routes

// Set a larger limit for the request body
app.use(bodyParser.json({ limit: '50mb' })); // Adjust the limit as needed

const TIMEOUT_DURATION = 100000; // Timeout duration in milliseconds (100 seconds)
const MAX_TOKENS = 8000; // Maximum tokens allowed by the model
const TOLERANCE = 100; // Tolerance to avoid exceeding token limit
let conversationHistory = {};

// Helper function to get current timestamp
const getTimestamp = () => {
    const now = new Date();
    const date = now.toLocaleDateString('en-US');
    const time = now.toLocaleTimeString('en-US');
    return `${date} [${time}]`;
};

// Middleware to track conversation history by CF-Connecting-IP
app.use((req, res, next) => {
    const ip = req.headers['cf-connecting-ip'] || req.headers['x-forwarded-for'] || req.headers['x-real-ip'] || req.ip;
    req.clientIp = ip; // Store the IP in a request property
    console.log(`${getTimestamp()} [INFO] Incoming request from IP: ${req.clientIp}`); // Log the IP address

    if (!conversationHistory[req.clientIp]) {
        console.log(`${getTimestamp()} [INFO] Initializing conversation history for new IP: ${req.clientIp}`);
        conversationHistory[req.clientIp] = [
            { role: 'system', content: prompt }
        ];
    }
    next();
});

async function countLlamaTokens(messages) {
    let totalTokens = 0;
    for (const message of messages) {
        if (message.role === 'user' || message.role === 'assistant') {
            const encodedTokens = llamaTokenizer.encode(message.content);
            totalTokens += encodedTokens.length;
        }
    }
    return totalTokens;
}

async function trimConversationHistory(messages, maxLength, tolerance) {
    let tokenLength = await countLlamaTokens(messages);
    while (tokenLength > maxLength - tolerance && messages.length > 1) {
        messages.splice(1, 1); // Remove the oldest user/assistant message
        tokenLength = await countLlamaTokens(messages);
        console.log(`${getTimestamp()} [CLEANUP] Trimmed conversation history to ${tokenLength} tokens.`);
    }
}

// Function to scrape web page
async function scrapeWebPage(url) {
    console.log(`${getTimestamp()} [INFO] Starting to scrape URL: ${url}`);
    try {
        const res = await axios.get(url);
        const html = res.data;
        const $ = cheerio.load(html);

        // Extract page title, meta description and content
        const pageTitle = $('head title').text().trim();
        const pageDescription = $('head meta[name="description"]').attr('content');
        const pageContent = $('body').text().trim();

        // Construct response message with page details
        let response = `Title: ${pageTitle}\n`;
        if (pageDescription) {
            response += `Description: ${pageDescription}\n`;
        }
        if (pageContent) {
            const MAX_CONTENT_LENGTH = process.env.MAX_CONTENT_LENGTH || 2000;
            let plainTextContent = $('<div>').html(pageContent).text().trim().replace(/[\r\n\t]+/g, ' ');
            const codePattern = /\/\/|\/\*|\*\/|\{|\}|\[|\]|\bfunction\b|\bclass\b|\b0x[0-9A-Fa-f]+\b|\b0b[01]+\b/;
            const isCode = codePattern.test(plainTextContent);

            if (isCode) {
                plainTextContent = plainTextContent.replace(codePattern, '');
            }
            plainTextContent = plainTextContent.replace(/ *\([^)]*\) */g, '');
            if (plainTextContent.length > MAX_CONTENT_LENGTH) {
                plainTextContent = plainTextContent.substring(0, MAX_CONTENT_LENGTH) + '...';
            }
            response += `Content: ${plainTextContent.trim()}`;
        }
        response += `\nURL: ${url}`;

        console.log(`${getTimestamp()} [INFO] Successfully scraped URL: ${url}`);
        return response;
    } catch (err) {
        console.error(`${getTimestamp()} [ERROR] Failed to scrape URL: ${url}`, err);
        return null;
    }
}

async function processRequest(req, res) {
    const startTime = Date.now(); // Start time tracking
    const ip = req.clientIp;
    console.log(`${getTimestamp()} [INFO] Handling chat request from IP: ${ip}`); // Log the IP address

    const timeout = setTimeout(() => {
        console.error(`${getTimestamp()} [ERROR] Request timed out for IP: ${ip}`);
        res.status(408).json({ message: "Request timed out" });
    }, TIMEOUT_DURATION);

    try {
        let userMessage = req.body.message;
        console.log(`${getTimestamp()} [INFO] Received user message: ${userMessage}`);
        userMessage = req.body.message + `\nDate/Time:${getTimestamp()}`;

        if (!conversationHistory[ip]) {
            console.log(`${getTimestamp()} [INFO] Initializing conversation history for new IP: ${ip}`);
            conversationHistory[ip] = [{ role: 'system', content: prompt }];
        }
        conversationHistory[ip].push({ role: 'user', content: userMessage });

        // Trim conversation history if it exceeds the token limit
        await trimConversationHistory(conversationHistory[ip], MAX_TOKENS, TOLERANCE);

        const logLines = userMessage.split('\n');
        const clientIpRegex = /\[Client (\d{1,3}\.){3}\d{1,3}\]/;
        const filteredLogLines = logLines.filter(line => clientIpRegex.test(line));

        if (filteredLogLines.length === 0) {
            console.log(`${getTimestamp()} [INFO] No valid client IP addresses found in the log.`);
            res.json({ message: "No valid client IP addresses found in the log." });
            return;
        }

        const filteredMessage = filteredLogLines.join('\n');

        console.log(`${getTimestamp()} [INFO] Sending request to llama API for response`);
        const response = await axios.post('http://127.0.0.1:8003/v1/chat/completions', {
            model: 'gpt-3.5-turbo',
            messages: [...conversationHistory[ip], { role: 'user', content: filteredMessage }]
        });
        const assistantMessage = response.data.choices[0].message;
        conversationHistory[ip].push(assistantMessage);

        console.log(`${getTimestamp()} [INFO] Received response from llama API: ${assistantMessage.content}`);
        console.log(`${getTimestamp()} [DEBUG] Finish Reason: ${response.data.choices[0].finish_reason}`);
        console.log(`${getTimestamp()} [STATS] Usage: prompt_tokens=${response.data.usage.prompt_tokens}, completion_tokens=${response.data.usage.completion_tokens}, total_tokens=${response.data.usage.total_tokens}`);

        clearTimeout(timeout);
        res.json(assistantMessage);
    } catch (error) {
        console.error(`${getTimestamp()} [ERROR] An error occurred while handling chat request`, error);
        clearTimeout(timeout);
        res.status(500).json({ message: "An error occurred", error: error.message });
    } finally {
        const endTime = Date.now(); // End time tracking
        const processingTime = ((endTime - startTime) / 1000).toFixed(2); // Calculate processing time in seconds
        console.log(`${getTimestamp()} [STATS] Processing Time: ${processingTime} seconds`);
        console.log(`${getTimestamp()} [INFO] Finished processing chat request for IP: ${ip}`);
    }
}

app.post('/api/v1/chat', async (req, res) => {
    // Trim the incoming message to fit within token limits
    const messageContent = req.body.message;
    const encodedTokens = llamaTokenizer.encode(messageContent);
    const MAX_MESSAGE_TOKENS = MAX_TOKENS - (await countLlamaTokens([{ role: 'system', content: prompt }])) - TOLERANCE;

    let trimmedMessageContent = messageContent;
    if (encodedTokens.length > MAX_MESSAGE_TOKENS) {
        trimmedMessageContent = llamaTokenizer.decode(encodedTokens.slice(0, MAX_MESSAGE_TOKENS));
    }

    await processRequest({ ...req, body: { message: trimmedMessageContent } }, res);
});

app.get('/api/v1/conversation-history', (req, res) => {
    const ip = req.clientIp;
    console.log(`${getTimestamp()} [INFO] Fetching conversation history for IP: ${ip}`); // Log the IP address
    res.json(conversationHistory[ip]);
});

app.post('/api/v1/restart-core', (req, res) => {
    console.log(`${getTimestamp()} [INFO] Restarting core service`);
    cmd(`docker restart llama-gpu-server`).then(out => {
        console.log(`${getTimestamp()} [INFO] Core service restarted`);
        res.json(out.stdout);
    }).catch(err => {
        console.error(`${getTimestamp()} [ERROR] Failed to restart core service`, err);
        res.status(500).json({ message: "An error occurred while restarting the core service", error: err.message });
    });
});

app.post('/api/v1/reset-conversation', (req, res) => {
    const ip = req.clientIp;
    console.log(`${getTimestamp()} [INFO] Resetting conversation history for IP: ${ip}`); // Log the IP address

    conversationHistory[ip] = [
        { role: 'system', content: prompt }
    ];
    console.log(`${getTimestamp()} [INFO] Conversation history reset for IP: ${ip}`);
    res.json({ message: "Conversation history reset for IP: " + ip });
});

app.listen(port, () => {
    console.log(`${getTimestamp()} [INFO] Server running at http://localhost:${port}`);
});