import fs from 'fs';
import path from 'path';
import sharp from 'sharp';
import fetch from 'node-fetch';

const cacheDir = process.cwd() + path.sep + "cache";
if (!fs.existsSync(cacheDir)) {
    fs.mkdirSync(cacheDir);
    console.log("Created cache directory");
}

export default async function handler(req, res) {
    const mapHash = req.query.hash.replace("custom_level_", "").toLowerCase();
    const ext = req.query.ext;

    const imagePath = cacheDir + path.sep + mapHash + "." + ext;
    const exists = fs.existsSync(imagePath);
    if (!exists) {
        const data = await fetch(`https://eu.cdn.beatsaver.com/${mapHash}.${ext}`);
        let buffer = await data.buffer();
        buffer = await sharp(buffer).resize(150, 150).toBuffer();
        fs.writeFileSync(imagePath, buffer);
        res.setHeader('Content-Type', 'image/' + ext);
        res.send(buffer);
        console.log("Song Art Cache - Added song \"" + mapHash + "\"");
        return;
    }
    const buffer = fs.readFileSync(imagePath);
    res.setHeader('Content-Type', 'image/jpg' + ext);
    res.send(buffer);
}