const express = require("express");
const { CaptchaGenerator } = require("captcha-canvas");
const fs = require("fs");
const os = require("os");
const path = require("path");
const crypto = require("crypto");

const app = express();
app.set('json spaces', 4)
const tempDir = os.tmpdir();

function generateRandomHex(length) {
    return crypto.randomBytes(length).toString("hex");
}

app.use("/tmp", express.static(tempDir));

app.all("/", async (req, res) => {
    const captcha = new CaptchaGenerator({ height: 200, width: 600 })

    const fileName = `temp_${generateRandomHex(8)}.png`;
    const filePath = path.join(tempDir, fileName);
  
    const buffer = await captcha.generate()

    fs.writeFile(filePath, buffer, (err) => {
        if (err) return res.status(500).json({ error: "Failed to save captcha" });

        res.json({
            answer: captcha.text,
            url: `https://${req.hostname}/tmp/${fileName}`
        });
    });
});

app.listen(7860, () => console.log("Server running on port 7860"));