/**
 * Author: Simon-Pierre Boucher
 * Contact: contact@spboucher.ai
 * Project: Hilmacorp.ai — Web Platform
 * File: lib/validate.ts
 * Description: Pure validation logic for the contact form (shared by the API route and tests)
 */

export interface ContactPayload {
  name: string;
  organization: string;
  email: string;
  message: string;
}

export interface ValidationResult {
  ok: boolean;
  errors: Partial<Record<keyof ContactPayload, string>>;
  data?: ContactPayload;
}

const EMAIL_RE = /^[^\s@]+@[^\s@]+\.[^\s@]{2,}$/;
const MAX_FIELD = 500;
const MAX_MESSAGE = 5000;

function clean(value: unknown, max: number): string {
  if (typeof value !== "string") return "";
  return value.trim().slice(0, max);
}

export function validateContact(input: unknown): ValidationResult {
  const raw = (input ?? {}) as Record<string, unknown>;
  const data: ContactPayload = {
    name: clean(raw.name, MAX_FIELD),
    organization: clean(raw.organization, MAX_FIELD),
    email: clean(raw.email, MAX_FIELD),
    message: clean(raw.message, MAX_MESSAGE),
  };

  const errors: ValidationResult["errors"] = {};
  if (data.name.length < 2) errors.name = "invalid_name";
  if (!EMAIL_RE.test(data.email)) errors.email = "invalid_email";
  if (data.message.length < 10) errors.message = "invalid_message";

  const ok = Object.keys(errors).length === 0;
  return ok ? { ok, errors, data } : { ok, errors };
}