import type { DomainEvent } from "./events.js";
import type { DomainError, Encounter } from "./types.js";

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

export function clearEncounter(
	encounter: Encounter,
): ClearEncounterSuccess | DomainError {
	if (encounter.combatants.length === 0) {
		return {
			kind: "domain-error",
			code: "encounter-already-empty",
			message: "Cannot clear an encounter that has no combatants",
		};
	}

	return {
		encounter: {
			combatants: [],
			activeIndex: 0,
			roundNumber: 1,
		},
		events: [
			{
				type: "EncounterCleared",
				combatantCount: encounter.combatants.length,
			},
		],
	};
}