// Milestone A2 demo — start a peer pool, watch it bootstrap from DNS
// seeds, connect to N peers, exchange getaddr, discover more peers.
// Prints every meaningful event and a summary after ~30 seconds.

import { PeerPool } from '../src/index.js';

const RUN_MS = Number(process.argv[2]) || 30_000;
const POOL_SIZE = Number(process.argv[3]) || 8;

console.log('\n=== DigiByte P2P Peer Pool Demo ===\n');
console.log(`Target pool size: ${POOL_SIZE}`);
console.log(`Runtime:          ${RUN_MS / 1000}s\n`);

const pool = new PeerPool({
  poolSize: POOL_SIZE,
  peerOpts: { handshakeTimeoutMs: 10_000 },
});

let seededTotal = 0;
let connectCount = 0;
let failCount = 0;
let discoveredTotal = 0;

pool.on('seed', ({ seed, ips }: { seed: string; ips: string[] }) => {
  console.log(`  [seed]        ${seed} -> ${ips.length} IPv4`);
  seededTotal += ips.length;
});
pool.on('seedError', ({ seed, error }: { seed: string; error: string }) => {
  console.log(`  [seed]        ${seed} -> ERROR ${error}`);
});
pool.on(
  'connect',
  ({ host, port, userAgent, services, startHeight }: {
    host: string;
    port: number;
    userAgent: string;
    services: string;
    startHeight: number;
  }) => {
    connectCount++;
    console.log(`  [connect]     ${host}:${port}  ua=${userAgent}  h=${startHeight.toLocaleString()}  services=${services}`);
  },
);
pool.on('connectFail', ({ host, port, error }: { host: string; port: number; error: string }) => {
  failCount++;
  // Only log the first handful of failures; a healthy pool sees many.
  if (failCount <= 5) {
    console.log(`  [connectFail] ${host}:${port} -> ${error}`);
  }
});
pool.on(
  'discovered',
  ({ count, poolSize, candidates }: { count: number; poolSize: number; candidates: number }) => {
    discoveredTotal += count;
    console.log(`  [discovered]  +${count} new peers (pool=${poolSize} live, ${candidates} queued)`);
  },
);
pool.on('disconnect', ({ key }: { key: string }) => {
  console.log(`  [disconnect]  ${key}`);
});

setTimeout(() => {
  console.log('\n--- summary ---');
  console.log(`  seeded from DNS:    ${seededTotal} IPs`);
  console.log(`  connect successes:  ${connectCount}`);
  console.log(`  connect failures:   ${failCount}${failCount > 5 ? ' (first 5 shown above)' : ''}`);
  console.log(`  peers discovered:   ${discoveredTotal} via getaddr`);
  console.log(`  live at end:        ${pool.liveCount}/${POOL_SIZE}`);
  console.log(`  queued candidates:  ${pool.candidateCount}`);
  console.log();
  pool.stop();
  process.exit(0);
}, RUN_MS);