import {
	type DomainError,
	type DomainEvent,
	type Encounter,
	isDomainError,
} from "@initiative/domain";
import type { EncounterStore } from "./ports.js";

interface EncounterActionResult {
	readonly encounter: Encounter;
	readonly events: DomainEvent[];
}

export function runEncounterAction(
	store: EncounterStore,
	action: (encounter: Encounter) => EncounterActionResult | DomainError,
): DomainEvent[] | DomainError {
	const encounter = store.get();
	const result = action(encounter);

	if (isDomainError(result)) {
		return result;
	}

	store.save(result.encounter);
	return result.events;
}