Economy

// From packages/shared/src/constants/GameConstants.ts
export const INVENTORY_CONSTANTS = {
  MAX_INVENTORY_SLOTS: 28,
  MAX_BANK_SLOTS: 100,
  MAX_STACK_SIZE: 1000,
  DEFAULT_ITEM_VALUE: 1,
} as const;

// From packages/shared/src/data/npcs.ts (lines 107-149)
export function calculateNPCDrops(
  npcId: string,
): Array<{ itemId: string; quantity: number }> {
  const npc = getNPCById(npcId);
  if (!npc) return [];

  const drops: Array<{ itemId: string; quantity: number }> = [];

  // Add default drop if enabled
  if (npc.drops.defaultDrop.enabled) {
    drops.push({
      itemId: npc.drops.defaultDrop.itemId,
      quantity: npc.drops.defaultDrop.quantity,
    });
  }

  // Roll for drop tiers: always, common, uncommon, rare, veryRare
  npc.drops.always.forEach(processDrop);
  npc.drops.common.forEach(processDrop);
  npc.drops.uncommon.forEach(processDrop);
  npc.drops.rare.forEach(processDrop);
  npc.drops.veryRare.forEach(processDrop);

  return drops;
}