/**
 * Integration Guide: Swapping WebSocket for Braid-HTTP
 *
 * This shows the minimal changes needed in consensus-service/src/consensus/service.ts
 * to use Braid-HTTP transport instead of WebSocket.
 *
 * Changes needed:
 * 1. Replace PeerManager with BraidPeerManager
 * 2. Replace StateSync with BraidStateSync
 * 3. Mount Braid router on Express app
 * 4. Add BraidStatePublisher for Simpleton clients
 * 5. Call notifyChange() after document mutations
 *
 * Everything else (ConsensusNode, ConsensusDocument, RollupAggregator)
 * stays exactly the same.
 */

// ============================================================
// BEFORE (WebSocket-based) — in consensus/service.ts
// ============================================================
//
// import { PeerManager } from '../sync/peer-manager.js';
// import { StateSync } from '../sync/state-sync.js';
//
// // In start():
// this.peerManager = new PeerManager({
//   nodeId, publicKey, privateKey, host, port, redisUrl,
// });
// await this.peerManager.start(); // starts WebSocket server on port+1000
//
// this.stateSync = new StateSync(this.document, this.peerManager);
// this.stateSync.start(); // starts polling timer

// ============================================================
// AFTER (Braid-HTTP) — in consensus/service.ts
// ============================================================

import express from 'express';
import {
  BraidPeerManager,
  BraidStateSync,
  BraidStatePublisher,
} from '@rspace/braid-transport';

// --- In constructor or start() ---

const app = express();
app.use(express.json());

// 1. Create Braid peer manager (replaces WebSocket PeerManager)
const braidPeerManager = new BraidPeerManager({
  nodeId: 'node-1',
  publicKey: '...',
  privateKey: new Uint8Array([]),
  host: 'consensus-service',
  port: 3007,
  redisUrl: 'redis://redis:6379',
});

// 2. Mount Braid routes on Express (no separate WebSocket server!)
app.use(braidPeerManager.createRouter());

// 3. Create push-based state sync (replaces polling StateSync)
const document = null as any; // your ConsensusDocument
const braidStateSync = new BraidStateSync(document, braidPeerManager);

// 4. Create state publisher for Simpleton light clients
const statePublisher = new BraidStatePublisher(document);
app.use(statePublisher.createRouter());

// 5. Start everything
await braidPeerManager.start();
braidStateSync.start();

// 6. After any document mutation, notify both sync systems:
//    braidStateSync.notifyChange();    // push to peer nodes
//    statePublisher.notifyChange();    // push to simpleton clients

// --- Wire up consensus events (same as before) ---
// braidPeerManager.on('message:propose', ...) — same handlers
// braidPeerManager.on('message:vote', ...) — same handlers
// braidPeerManager.on('message:commit', ...) — same handlers
// braidPeerManager.on('peer:connected', ...) — same handlers
// braidPeerManager.on('peer:disconnected', ...) — same handlers

// ============================================================
// Simpleton Client Usage (e.g., in wallet-service)
// ============================================================

import { SimpletonClient } from '@rspace/braid-transport';

async function walletServiceExample() {
  // Create a light client — no Automerge dependency needed!
  const client = new SimpletonClient({
    endpoint: 'http://consensus-service:3007',
  });

  // Watch specific addresses for balance changes
  client.watchAddress('0x1234...');

  client.on('balance:changed', (address, balances) => {
    console.log(`Balance changed for ${address}:`, balances);
  });

  client.on('state:updated', (state) => {
    console.log('State version:', state.version);
    console.log('Wallet count:', Object.keys(state.wallets).length);
  });

  // Connect — opens Braid-HTTP subscription
  await client.connect();

  // One-shot balance query (doesn't need subscription)
  const balance = await client.fetchBalance('0x1234...');
  console.log('Balance:', balance);

  // Read from cached state (instant, no network call)
  const cachedBalance = client.getBalance('0x1234...', '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913');
  console.log('Cached USDC balance:', cachedBalance);
}