export interface TradeField {
    buy?: Record<string, number>;
    sell?: Record<string, number>;
    shops?: string[];
}
export interface TradeRejection {
    reason: string;
}
export interface TradeWallet {
    canAfford(costs: Record<string, number>): string | null;
    charge(costs: Record<string, number>): void;
    grant(gains: Record<string, number>): void;
}
export interface TradeInventory {
    put(inventoryId: string, itemId: string, count: number): TradeRejection | null;
    take(inventoryId: string, itemId: string, count: number): TradeRejection | null;
    count(inventoryId: string, itemId: string): number;
}
export interface TradeSystemDeps {
    resolveTrade(itemId: string): TradeField | null | undefined;
    wallet: TradeWallet;
    inventory: TradeInventory;
}
export interface TradeParty {
    shop: string;
    inventoryId: string;
}
export interface TradeSystem {
    canBuy(itemId: string, shopId: string, count?: number): string | null;
    canSell(itemId: string, count?: number): string | null;
    buy(itemId: string, count: number | undefined, party: TradeParty): TradeRejection | null;
    sell(itemId: string, count: number | undefined, party: TradeParty): TradeRejection | null;
    tradableAt(shopId: string, allItemIds: string[]): string[];
}
/** @internal */
export declare function canAffordCosts(balances: Record<string, number>, costs: Record<string, number>): string | null;
export interface TradeOutcome {
    itemId: string;
    count: number;
    currency: Record<string, number>;
}
export type TradeResolution = {
    status: "ok";
    outcome: TradeOutcome;
} | {
    status: "rejected";
    reason: string;
};
/** @internal */
export declare function resolveBuy(itemId: string, trade: TradeField | null | undefined, shopId: string, count: number, balances: Record<string, number>): TradeResolution;
/** @internal */
export declare function resolveSell(itemId: string, trade: TradeField | null | undefined, count: number): TradeResolution;
/** @internal */
export declare function applyTradeOutcome(outcome: TradeOutcome, appliers: {
    adjustItem(itemId: string, count: number): {
        reason: string;
    } | null;
    adjustCurrency(delta: Record<string, number>): void;
}): {
    reason: string;
} | null;
/**
 * Buy and sell goods against player currency balances, resolving affordability and price.
 *
 * @capability shop-trade buy and sell goods against player currency balances
  * @internal
  */
export declare function createTradeSystem(deps: TradeSystemDeps): TradeSystem;