// Copyright 2017-2022 @polkadot/networks authors & contributors
// SPDX-License-Identifier: Apache-2.0

import fs from 'fs';
import fetch from 'node-fetch';

import { substrateRegistry } from '../build/defaults.js';

const substrateRegistryRepo = substrateRegistry
  .replace('raw.githubusercontent.com', 'github.com')
  .split('main')[0];

function outputField (k, v) {
  if (typeof v === 'string') {
    return `'${v}'`;
  } else if (Array.isArray(v)) {
    // new format is [] to indicate optionality
    return (['decimals', 'symbols'].includes(k) && !v.length)
      ? null
      : `[${v.map((v) => outputField(k, v)).join(', ')}]`;
  }

  return v;
}

async function getSubstrateRegistry () {
  const original = await fetch(substrateRegistry);
  const json = await original.json();

  return json.registry
    .map((e) =>
      `  {\n${Object
        .entries(e)
        .sort(([a], [b]) => a.localeCompare(b))
        .map(([k, v]) => `    ${k}: ${outputField(k, v)}`)
        .join(',\n')}\n  }`
    )
    .join(',\n');
}

getSubstrateRegistry()
  .then((entries) => {
    fs.writeFileSync('packages/networks/src/substrate.ts', `// Copyright 2017-2022 @polkadot/networks authors & contributors
// SPDX-License-Identifier: Apache-2.0

//
// Auto-generated by yarn networks:sync (via scripts/fromSubstrate.mjs)
//
// This file should never be edited manually. Rather the process is as follow -
//
//   - make a PR to the upstream registry found at ${substrateRegistryRepo}
//   - ensure the PR gets merged
//   - yarn networks:sync in this repo to sync
//
// Any manual changes to this file will make CI cron checks fail and will be
// lost when the registry is updated alongside the above sync.
//

import type { KnownSubstrate } from './types';

export const knownSubstrate: KnownSubstrate[] = [\n${entries}\n];
`);

    console.log('Completed.');

    process.exit(0);
  })
  .catch((error) => {
    console.error('Error:', error.message);

    process.exit(-1);
  });