src/lib/buildProviderScopedModel.ts

export function buildProviderScopedModel(model: string, provider?: string | null): string {
	if (!provider) {
		return model;
	}

	const trimmedProvider = provider.trim();
	if (!trimmedProvider) {
		return model;
	}

	const colonIndex = model.indexOf(":");
	const baseModel = colonIndex === -1 ? model : model.slice(0, colonIndex);

	return `${baseModel}:${trimmedProvider}`;
}