const {
    createCanvas,
    loadImage
} = require('canvas')
const fs = require('fs');
const bigInt = require("big-integer");

var image_data = bigInt(process.argv[2]).toString(2);
var image_size = Math.ceil(Math.pow(image_data.length, 0.5));
console.log("Image data (len "+image_data.length+"): "+image_data);
console.log("Image size: "+image_size);
const canvas = createCanvas(image_size, image_size);
const ctx = canvas.getContext('2d');

for (var i = 0; i < image_data.length; i++) {
    var x = i%image_size;
    var y = Math.floor(i/image_size);
    if (image_data[i] == "1") {
        ctx.fillStyle = "#000000";
        console.log("pixel ("+x+","+y+") is black");
    } else {
        ctx.fillStyle = "#FFFFFF";
        console.log("pixel ("+x+","+y+") is white");
    }
    ctx.fillRect( x, y, 1, 1 );
}
var d = new Date();
var fn = "output/test_"+(d.getTime())+".png";
var out = fs.createWriteStream(fn)
const stream = canvas.createPNGStream({
    quality: 0.95,
    chromaSubsampling: false
})
stream.pipe(out)
out.on('finish', () => {
    return console.log("done");
});