import { ToolError } from "@oh-my-pi/pi-tui/tools/tool-errors";

/** Normalize explicit distribution requirements without accepting package-manager flags. */
export function normalizePackageRequirements(requirements: readonly string[]): string[] {
	const normalized = new Set<string>();
	for (const requirement of requirements) {
		if (typeof requirement !== "string") {
			throw new ToolError("Eval packages must be distribution requirement strings.");
		}
		const value = requirement.trim();
		if (!value || value.startsWith("-") || /[\r\n\0]/.test(value)) {
			throw new ToolError(
				"Eval packages must be nonempty distribution requirements, not installer flags or control characters.",
			);
		}
		normalized.add(value);
	}
	return [...normalized];
}