// The one Electrum call the deposit gate needs: a verbose transaction.

import tls from 'node:tls';
import net from 'node:net';

export function electrumCall({ host, port, tls: useTls = true, timeoutMs = 15_000 }, method, params) {
  return new Promise((resolve, reject) => {
    const sock = useTls ? tls.connect({ host, port, servername: host }) : net.connect({ host, port });
    let buf = '';
    const timer = setTimeout(() => { sock.destroy(); reject(new Error('Electrum server did not answer')); }, timeoutMs);
    const done = (err, val) => { clearTimeout(timer); sock.end(); if (err) reject(err); else resolve(val); };
    sock.setEncoding('utf8');
    sock.on('error', (e) => done(e));
    sock.write(JSON.stringify({ jsonrpc: '2.0', id: 0, method: 'server.version', params: ['pithos-hosted', '1.4'] }) + '\n');
    sock.write(JSON.stringify({ jsonrpc: '2.0', id: 1, method, params }) + '\n');
    sock.on('data', (d) => {
      buf += d;
      let i;
      while ((i = buf.indexOf('\n')) >= 0) {
        const line = buf.slice(0, i);
        buf = buf.slice(i + 1);
        let msg;
        try { msg = JSON.parse(line); } catch { continue; }
        if (msg.id !== 1) continue;
        if (msg.error) return done(new Error(msg.error.message || 'Electrum error'));
        return done(null, msg.result);
      }
    });
  });
}