import { balance } from '../config/gameBalance.js';
import { prisma } from '../db/prisma.js';
import { getActiveEvents, priceModifierForCity } from '../modules/events/events.service.js';
import { clampDemandSupply, computePrices } from '../modules/market/pricing.js';
import { emitGlobal } from '../realtime/socket.js';

/**
 * Tick del mercato (ogni minuto): domanda e offerta tornano lentamente
 * verso l'equilibrio e i prezzi vengono ricalcolati con i modificatori
 * degli eventi attivi.
 */
export async function updateMarketPrices(): Promise<void> {
  const m = balance.market;
  const [events, prices] = await Promise.all([
    getActiveEvents(),
    prisma.marketPrice.findMany({ include: { item: true, city: true } }),
  ]);

  const updates = prices.map((price) => {
    const demand = clampDemandSupply(
      price.demand * m.decayFactor + m.equilibrium * (1 - m.decayFactor),
    );
    const supply = clampDemandSupply(
      price.supply * m.decayFactor + m.equilibrium * (1 - m.decayFactor),
    );
    const next = computePrices(
      price.item.basePrice,
      price.city.economyModifier,
      demand,
      supply,
      priceModifierForCity(events, price.cityId),
    );
    return prisma.marketPrice.update({
      where: { cityId_itemId: { cityId: price.cityId, itemId: price.itemId } },
      data: { demand, supply, buyPrice: next.buyPrice, sellPrice: next.sellPrice },
    });
  });

  await prisma.$transaction(updates);
  emitGlobal('market:updated', { updatedAt: new Date().toISOString() });
}