initiative/packages/domain/src/delete-player-character.ts

import type { DomainEvent } from "./events.js";
import type {
	PlayerCharacter,
	PlayerCharacterId,
} from "./player-character-types.js";
import type { DomainError } from "./types.js";

export interface DeletePlayerCharacterSuccess {
	readonly characters: readonly PlayerCharacter[];
	readonly events: DomainEvent[];
}

export function deletePlayerCharacter(
	characters: readonly PlayerCharacter[],
	id: PlayerCharacterId,
): DeletePlayerCharacterSuccess | DomainError {
	const index = characters.findIndex((c) => c.id === id);
	if (index === -1) {
		return {
			kind: "domain-error",
			code: "player-character-not-found",
			message: `Player character not found: ${id}`,
		};
	}

	const removed = characters[index];
	const newList = characters.filter((_, i) => i !== index);

	return {
		characters: newList,
		events: [
			{
				type: "PlayerCharacterDeleted",
				playerCharacterId: id,
				name: removed.name,
			},
		],
	};
}