import { DatabaseSync } from 'node:sqlite';
import { mkdtemp, rm, stat } from 'node:fs/promises';
import { tmpdir } from 'node:os';
import { join } from 'node:path';
import { monitorEventLoopDelay, performance } from 'node:perf_hooks';
import { randomUUID } from 'node:crypto';
import { setImmediate as yieldToEventLoop } from 'node:timers/promises';
import { Market } from '../server/market/store.ts';
import { CHAIN_ID, GENESIS_HASH, transactionId } from '../server/testnet/consensus.ts';
import { NETWORK } from '../shared/testnet.ts';

// Synthetic market journal only. It is isolated in a temporary SQLite database and never
// connects to a Ledger, peer, payment adapter, wallet, or production data directory.
const text = process.argv[2] ?? '10000';
if (!/^[1-9]\d{0,5}$/.test(text) || Number(text) > 100000) throw new Error('Fixture size must be 1..100000 orders');
const count = Number(text), scenario = process.argv[3] ?? 'terminal';
if (!['terminal', 'confirmed-delivery'].includes(scenario)) throw new Error('Scenario must be terminal or confirmed-delivery');
const directory = await mkdtemp(join(tmpdir(), 'wikideck-market-reconciliation-'));
const streamId = randomUUID(), tip = 'a'.repeat(64);
const deliveryRows = new Map<string, { height: number; blockHash: string }>();
const seller = '1'.repeat(64), buyer = '2'.repeat(64);
let market: Market | undefined;
try {
  // Indexed-only adapter: the benchmark must not fall back to materializing chain snapshots.
  const chain = {
    snapshot: () => { throw new Error('Benchmark must not request a full chain snapshot'); },
    summary: () => ({ tip, revision: 0, height: 2 }),
    nft: () => undefined,
    canonicalTransaction: (id: string) => deliveryRows.get(id),
    pendingTransactions: () => [],
    canonicalHead: () => 0,
    canonicalEvents: (after: number) => ({ streamId, previousAnchor: GENESIS_HASH, anchor: GENESIS_HASH,
      events: [], cursor: after, head: 0, caughtUp: true }),
    submitTransfer: async () => { throw new Error('Benchmark never submits transfers'); },
  };
  market = await Market.open(directory, chain, { feeBps: 250, confirmations: 2 });
  const db = new DatabaseSync(join(directory, NETWORK.includes('mainnet') ? 'mainnet' : 'testnet', 'market.sqlite'));
  try {
    const insertListing = db.prepare('INSERT INTO listings(id,card,status,data) VALUES(?,?,?,?)');
    const insertOrder = db.prepare('INSERT INTO orders(id,data) VALUES(?,?)');
    db.exec('BEGIN IMMEDIATE');
    try {
      for (let i = 0; i < count; i++) {
        const id = i.toString().padStart(12, '0');
        const listingId = `listing-${id}`, orderId = `order-${id}`, cardHash = i.toString(16).padStart(64, '0');
        const terminal = scenario === 'terminal';
        const listingStatus = terminal ? 'cancelled' : 'reserved';
        const listing = { id: listingId, cardHash, seller, sequence: 0, kind: 'fixed', status: listingStatus };
        const order = { id: orderId, listingId, seller, buyer, cardHash, sequence: 0,
          status: terminal ? 'refunded' : 'paid', payout: null, deliveryConfirmations: 0,
          requiredConfirmations: 2, createdAt: 1, payBy: 2, deliverBy: 3 };
        if (!terminal) {
          const delivery = { network: NETWORK, chainId: CHAIN_ID, cardHash, from: seller, to: buyer,
            sequence: 0, publicKey: '', signature: '' };
          deliveryRows.set(transactionId(delivery), { height: 1, blockHash: tip });
        }
        insertListing.run(listingId, cardHash, listingStatus, JSON.stringify(listing));
        insertOrder.run(orderId, JSON.stringify(order));
      }
      db.exec('COMMIT');
    } catch (error) { db.exec('ROLLBACK'); throw error; }
  } finally { db.close(); }

  const latencies: number[] = [];
  const maxPasses = Math.ceil(count / 128) * 2 + 4;
  const eventLoopDelay = monitorEventLoopDelay({ resolution: 10 });
  eventLoopDelay.enable();
  const start = performance.now();
  try {
    for (let pass = 0; pass < maxPasses && (pass === 0 || market.hasReconciliationBacklog()); pass++) {
      const before = performance.now();
      market.browse();
      latencies.push(performance.now() - before);
      await yieldToEventLoop(); // Permit the delay monitor to observe synchronous batch stalls.
    }
  } finally { eventLoopDelay.disable(); }
  const elapsedMs = performance.now() - start;
  if (market.hasReconciliationBacklog()) throw new Error(`Reconciliation did not finish within ${maxPasses} bounded passes`);
  market.close(); market = undefined;
  const bytes = (await stat(join(directory, NETWORK.includes('mainnet') ? 'mainnet' : 'testnet', 'market.sqlite'))).size;
  latencies.sort((a, b) => a - b);
  const percentile = (p: number) => latencies[Math.min(latencies.length - 1, Math.ceil(latencies.length * p) - 1)];
  console.log(JSON.stringify({ fixture: `synthetic-${scenario}-orders-and-listings`, orders: count, listings: count,
    batchSizePerTable: 128, reconciliationPasses: latencies.length, elapsedMs,
    rowsPerSecond: Math.round((count * 2 * 1000) / elapsedMs), passLatencyP50Ms: percentile(0.50),
    passLatencyP95Ms: percentile(0.95), passLatencyMaxMs: latencies.at(-1), sqliteBytes: bytes,
    eventLoopDelayResolutionMs: 10, eventLoopDelayP95Ms: eventLoopDelay.percentile(95) / 1e6,
    eventLoopDelayMaxMs: eventLoopDelay.max / 1e6,
    warning: 'Synthetic fixture on this development host only; canonical deliveries are adapter fixtures, not Ledger evidence. Excludes concurrent HTTP load, PostgreSQL, and production SLO certification.' }, null, 2));
} finally {
  market?.close();
  await rm(directory, { recursive: true, force: true });
}