#!/usr/bin/env node
/**
 * Build per-token metadata fragments from the original Arweave metadata.
 *
 *   node scripts/fetch-metadata.js [outDir=meta] [from=1] [to=100]
 *
 * For each token it downloads the original JSON, drops the image fields (they
 * are replaced onchain by the AVIF data URI), and writes the inner JSON
 * fragment — no surrounding braces — to <outDir>/<id>.json. Those are the exact
 * bytes storeArtwork expects as `metadata`, so each token keeps precisely the
 * name, description and attributes it was minted with.
 *
 * Plain node, no chain access. Re-run it freely; review the fragments before
 * uploading (scripts/store.js compares them byte for byte).
 */
import { mkdirSync, writeFileSync } from "node:fs";
import { join } from "node:path";

const BASE =
  process.env.ARWEAVE_BASE ??
  "https://arweave.net/2ydrm9ZHH7qxYrybOI4XeY9elm2JjpwSVXjcBhaZL6k";
const STRIP = ["image", "image_url", "image_details", "animation_url"];

const [outDir = process.env.META_DIR ?? "meta", from = "1", to = "100"] =
  process.argv.slice(2);
mkdirSync(outDir, { recursive: true });

let total = 0;
for (let id = Number(from); id <= Number(to); id++) {
  const res = await fetch(`${BASE}/${id}`);
  if (!res.ok) throw new Error(`#${id}: HTTP ${res.status} from ${BASE}/${id}`);
  const json = await res.json();

  const dropped = STRIP.filter((k) => k in json);
  for (const k of dropped) delete json[k];

  const fragment = JSON.stringify(json).slice(1, -1); // drop the surrounding { }
  const path = join(outDir, `${id}.json`);
  writeFileSync(path, fragment);
  total += fragment.length;
  console.log(
    `#${id}: ${fragment.length} B -> ${path}` +
      (dropped.length > 0 ? `  (dropped ${dropped.join(", ")})` : "  (no image field found!)"),
  );
}

console.log(
  `\n${total} bytes of metadata total. Review the fragments, then store them with\n` +
    `  npx hardhat run scripts/store.js --network <net>`,
);