#!/usr/bin/env bun
/**
 * Mint a NextGraph wallet and write it as a `.ngw` — the one-off a person runs to provision a
 * deployment.
 *
 * ── Why this exists next to the library function ─────────────────────────────
 * An application that hands a wallet out serves a `.ngw` at the URL it passes to
 * `configure({ sharedWallet: { fileUrl, password } })`, and nothing produces that file: minting
 * one means driving the wallet application in a browser, which is exactly what
 * `mintWalletBytes` already does for the suites. So this is not a second implementation — it is
 * that call, a `writeFileSync`, and the two lines a human needs to fill the configuration in.
 *
 * ── What it does NOT do ──────────────────────────────────────────────────────
 * It does not invent a password. The password is what opens the wallet for everyone the
 * deployment lets in; one chosen here would be a secret the tool knows and the operator does
 * not, printed to a terminal and never chosen by anybody. It is a required argument.
 *
 * It also refuses to overwrite an existing file unless told to. A `.ngw` is an identity, and
 * the identities it holds exist nowhere else — a clobbered one is not recoverable from the
 * broker or anywhere else.
 *
 * Usage:
 *   bun run packages/ng-e2e-helpers/bin/mint-wallet.ts --password <password> [--out <path.ngw>] [--name <wallet name>] [--force]
 */

import * as fs from "node:fs";
import * as path from "node:path";
import { DEFAULT_WALLET_NAME, mintWalletBytes } from "../src/wallet";

const USAGE =
  "usage: mint-wallet --password <password> [--out <path.ngw>] [--name <wallet name>] [--force]";

interface Options {
  readonly password: string;
  readonly name: string;
  readonly out: string;
  readonly force: boolean;
}

/** `--k v` and `--k=v` both, because a person types whichever one they learnt first. */
function parseArguments(argv: readonly string[]): Options {
  const values = new Map<string, string>();
  let force = false;
  for (let i = 0; i < argv.length; i++) {
    const arg = argv[i]!;
    if (arg === "--force") {
      force = true;
      continue;
    }
    if (!arg.startsWith("--")) throw new Error(`unexpected argument ${arg}\n${USAGE}`);
    const equals = arg.indexOf("=");
    const key = equals === -1 ? arg.slice(2) : arg.slice(2, equals);
    let value: string | undefined;
    if (equals !== -1) {
      value = arg.slice(equals + 1);
    } else {
      value = argv[++i];
    }
    if (value === undefined) throw new Error(`--${key} needs a value\n${USAGE}`);
    if (!["password", "out", "name"].includes(key)) {
      throw new Error(`unknown option --${key}\n${USAGE}`);
    }
    values.set(key, value);
  }

  const password = values.get("password");
  if (password === undefined || password === "") {
    throw new Error(`--password is required — this tool does not invent one\n${USAGE}`);
  }
  const name = values.get("name") ?? DEFAULT_WALLET_NAME;
  // Relative to where the person is standing, which is the only path they can predict. Any
  // default landing inside a checkout is covered by the repository-wide `*.ngw` ignore.
  const out = path.resolve(process.cwd(), values.get("out") ?? `${name}.ngw`);
  return { password, name, out, force };
}

async function main(): Promise<void> {
  const options = parseArguments(process.argv.slice(2));
  if (!options.force && fs.existsSync(options.out)) {
    throw new Error(
      `${options.out} already exists — a .ngw is an identity, so this refuses to overwrite one.\n` +
        "Pass --force if that file is genuinely disposable.",
    );
  }

  console.log(`[mint-wallet] minting the wallet "${options.name}" (this drives a real browser)...`);
  const bytes = await mintWalletBytes(options.password, options.name);
  fs.mkdirSync(path.dirname(options.out), { recursive: true });
  fs.writeFileSync(options.out, bytes);

  console.log("");
  console.log(`[mint-wallet] wrote ${bytes.length} bytes`);
  console.log(`  file:     ${options.out}`);
  console.log(`  password: ${options.password}`);
  console.log("");
  console.log("Serve that file, and give the application its URL and this password:");
  console.log("  configure({ sharedWallet: { fileUrl: <where you serve it>, password: <above> } })");
}

main().then(
  () => process.exit(0),
  (e: unknown) => {
    console.error(`[mint-wallet] ${e instanceof Error ? e.message : String(e)}`);
    process.exit(1);
  },
);