import { readFile, mkdir, mkdtemp, copyFile, rm } from "node:fs/promises";
import { dirname, resolve, sep } from "node:path";
import { gunzipSync } from "node:zlib";
import { renderSnapshot } from "../renderer/render.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(),
);
const parent = dirname(resolve(output));
await mkdir(parent, { recursive: true });
const temporary = await mkdtemp(resolve(parent, ".minegeo-map-"));
try {
  const report = await renderSnapshot(terrain, [], temporary);
  await copyFile(resolve(temporary, "map.webp"), resolve(output));
  console.log(
    `Rendered ${report.map.width} × ${report.map.height} aerial map from Y=${report.map.cameraY}: ${output}`,
  );
} finally {
  if (!temporary.startsWith(parent + sep))
    throw new Error("Refusing to remove a map directory outside its parent");
  await rm(temporary, { recursive: true, force: true });
}