#!/usr/bin/env node
import http from 'http';
import fs from 'fs';
import path from 'path';

const RPC_USER = process.env.BITCOIND_RPC_USER || 'omnl';
const RPC_PASS = process.env.BITCOIND_RPC_PASS || 'omnl-regtest-local';
const RPC_PORT = Number(process.env.BITCOIND_RPC_PORT || 18443);

function rpc(method, params = []) {
  return new Promise((resolve, reject) => {
    const body = JSON.stringify({ jsonrpc: '1.0', id: 'e2e', method, params });
    const req = http.request(
      {
        hostname: '127.0.0.1',
        port: RPC_PORT,
        method: 'POST',
        headers: {
          'Content-Type': 'application/json',
          Authorization: 'Basic ' + Buffer.from(`${RPC_USER}:${RPC_PASS}`).toString('base64'),
          'Content-Length': Buffer.byteLength(body),
        },
      },
      (res) => {
        let d = '';
        res.on('data', (c) => (d += c));
        res.on('end', () => {
          try {
            const j = JSON.parse(d);
            if (j.error) reject(new Error(JSON.stringify(j.error)));
            else resolve(j.result);
          } catch (e) {
            reject(e);
          }
        });
      },
    );
    req.on('error', reject);
    req.write(body);
    req.end();
  });
}

function upsertEnv(file, key, value) {
  if (!fs.existsSync(file)) return;
  let txt = fs.readFileSync(file, 'utf8');
  const line = `${key}=${value}`;
  if (new RegExp(`^${key}=`, 'm').test(txt)) {
    txt = txt.replace(new RegExp(`^${key}=.*$`, 'm'), line);
  } else {
    txt += `\n${line}\n`;
  }
  fs.writeFileSync(file, txt);
}

const info = await rpc('getblockchaininfo');
console.log(`chain=${info.chain} blocks=${info.blocks}`);
try {
  await rpc('createwallet', ['omnl']);
} catch {
  /* exists */
}
try {
  await rpc('loadwallet', ['omnl']);
} catch {
  /* loaded */
}

const addr = await rpc('getnewaddress', ['reserve', 'bech32']);
if (info.blocks < 101) {
  await rpc('generatetoaddress', [101 - info.blocks, addr]);
}
const bal = await rpc('getbalance');
console.log(`REGTEST_READY addr=${addr} bal=${bal}`);

const dep = await rpc('getnewaddress', ['omnl-e2e-deposit', 'bech32']);
const txid = await rpc('sendtoaddress', [dep, 0.001]);
await rpc('generatetoaddress', [6, addr]);
const tx = await rpc('gettransaction', [txid]);
console.log(`DEPOSIT txid=${txid} conf=${tx.confirmations} to=${dep}`);

upsertEnv(path.resolve('.env'), 'BTC_RESERVE_ADDRESSES', addr);
upsertEnv(path.resolve('config/deployment-omnl.production.env'), 'BTC_RESERVE_ADDRESSES', addr);

console.log(
  JSON.stringify({
    reserve: addr,
    deposit: dep,
    txid,
    confirmations: tx.confirmations,
    amountSats: 100_000,
  }),
);