#!/usr/bin/env node

import { readFileSync, writeFileSync } from "node:fs";
import { SVG, registerWindow } from "@svgdotjs/svg.js";
import { createSVGWindow } from "svgdom";

const input  = process.argv[2];
const output = process.argv[3];
const margin = Number.parseFloat(process.argv[4] ?? "0");
const bg     = process.argv[5] ?? null;

if (!input || !output) {
	process.exit(1);
}

const window = createSVGWindow();
const document = window.document;
registerWindow(window, document);

const raw = readFileSync(input, "utf8");
const canvas = SVG(document.documentElement);
canvas.svg(raw);

const box = canvas.bbox();   // REAL geometric bbox

const x = box.x - margin;
const y = box.y - margin;
const w = box.width  + margin * 2;
const h = box.height + margin * 2;

canvas.viewbox(x, y, w, h);

if (bg) {
	canvas.attr("style", `background:${bg}`);
}

writeFileSync(output, canvas.svg());