import { readFile, mkdir } from "node:fs/promises";
import { dirname, resolve } from "node:path";
import { gunzipSync } from "node:zlib";
import { renderSurfaceMap } from "../renderer/surface-map.mjs";

const [input, output] = process.argv.slice(2);
if (!input || !output)
  throw new Error(
    "Usage: npm run render:map -- <terrain.json.gz> <output.webp>",
  );
const terrain = JSON.parse(
  gunzipSync(await readFile(input), {
    maxOutputLength: 256 * 1024 * 1024,
  }).toString(),
);
await mkdir(dirname(resolve(output)), { recursive: true });
const report = await renderSurfaceMap(terrain, output);
console.log(
  `Rendered ${report.width} × ${report.height} map cells from ${report.columns.toLocaleString()} surface columns: ${output}`,
);