// Helpers for shaping values into `tailor.logger` structured attributes.
//
// Attribute values must be a string, number, boolean, or same-typed array; the
// platform silently drops nested objects, null, and mixed arrays. So an Error
// and an arbitrary command input both have to be flattened before they can be
// attached to a log entry.

import type { LogAttributes } from "@tailor-platform/sdk/runtime/logger";

/**
 * Split an unknown thrown value into loggable attributes: `error` carries the
 * message, `errorName` the class name when one is available.
 */
export function errorAttrs(error: unknown): LogAttributes {
  if (error instanceof Error) {
    return { error: error.message, errorName: error.name };
  }
  return { error: String(error) };
}

/**
 * Serialize a command/query input for logging. Kept as a single JSON string
 * attribute rather than flattened into one attribute per field: these wrappers
 * run for every command in every module, so flattening would mint unbounded
 * attribute keys and silently lose fields to the platform's 32-attribute cap.
 * Values that cannot be serialized (circular structures, BigInt) must not break
 * the caller, so they degrade to a marker string.
 */
export function inputAttr(input: unknown): string {
  try {
    return JSON.stringify(input) ?? String(input);
  } catch {
    return "[unserializable]";
  }
}