63 lines
1.5 KiB
TypeScript
63 lines
1.5 KiB
TypeScript
import type { DomainEvent } from "./events.js";
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import type { CombatantId, DomainError, Encounter } from "./types.js";
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export interface EditCombatantSuccess {
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readonly encounter: Encounter;
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readonly events: DomainEvent[];
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}
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/**
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* Pure function that renames a combatant in an encounter by ID.
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*
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* FR-001: Accepts Encounter, CombatantId, and newName; returns next state + events.
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* FR-002: Emits a CombatantUpdated event with combatantId, oldName, newName.
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* FR-004: Rejects empty/whitespace-only names with DomainError.
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* FR-005: Preserves activeIndex and roundNumber.
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* FR-006: Preserves combatant list order.
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*/
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export function editCombatant(
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encounter: Encounter,
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id: CombatantId,
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newName: string,
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): EditCombatantSuccess | DomainError {
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const trimmed = newName.trim();
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if (trimmed === "") {
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return {
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kind: "domain-error",
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code: "invalid-name",
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message: "Combatant name must not be empty",
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};
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}
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const index = encounter.combatants.findIndex((c) => c.id === id);
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if (index === -1) {
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return {
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kind: "domain-error",
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code: "combatant-not-found",
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message: `No combatant found with ID "${id}"`,
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};
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}
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const oldName = encounter.combatants[index].name;
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return {
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encounter: {
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combatants: encounter.combatants.map((c) =>
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c.id === id ? { ...c, name: trimmed } : c,
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),
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activeIndex: encounter.activeIndex,
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roundNumber: encounter.roundNumber,
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},
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events: [
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{
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type: "CombatantUpdated",
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combatantId: id,
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oldName,
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newName: trimmed,
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},
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],
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};
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}
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