const request = require('request');
const fs = require('fs');
const renderer = require('sdftosvg');

const SVG_OPTS = {
    backgroundColor: 'none',
}

function fetch(i) {
    return new Promise((resolve, reject) => {
        const url = `https://pubchem.ncbi.nlm.nih.gov/rest/pug/compound/CID/${i}/record/SDF/?record_type=2d&response_type=save&response_basename=Structure2D_CID_2519`;
        const output = `./../client/assets/molecules/${i}.svg`;

        request(url, function cb(err, res, body) {
            if (err) reject(err);

            // write file
            fs.writeFile(`./molecules/Structure2D_CID_${i}.sdf`, body, function written(err) {
                if (err) reject(err);
            });

            // write svg
            renderer.renderSdfToSvg(body, SVG_OPTS, function(err, svg) {
                if (err) reject(err);
                fs.writeFile(output, svg, function written(err) {
                    if (err) reject(err);
                    resolve();
                });
            });
        });
    });
}

async function loop() {
    for (var i = 10000; i >= 0; i--) {
        try {
            await fetch(i);
            console.log('finished record', i);
        } catch (e) {
            console.error(e);
        }
    }
}

loop();