import type express from "express";

export function jsonError(
  res: express.Response,
  status: number,
  message: string,
) {
  res.status(status).json({ error: message });
}

export function toStringOrEmpty(value: unknown) {
  return typeof value === "string" ? value.trim() : String(value ?? "").trim();
}

export function toNumber(value: unknown) {
  if (typeof value === "number" && Number.isFinite(value)) return value;
  if (typeof value === "string" && value.trim()) {
    const parsed = Number(value);
    return Number.isFinite(parsed) ? parsed : undefined;
  }
  return undefined;
}

export function toBoolean(value: unknown) {
  if (typeof value === "boolean") return value;
  if (typeof value === "string") {
    const v = value.trim().toLowerCase();
    if (v === "true" || v === "1" || v === "yes") return true;
    if (v === "false" || v === "0" || v === "no") return false;
  }
  return undefined;
}

export function toStringArray(value: unknown): string[] | undefined {
  if (!Array.isArray(value)) return undefined;
  const strings = value.map((v) => toStringOrEmpty(v)).filter(Boolean);
  return strings.length ? strings : undefined;
}