import { normalizeOptionalString, resolvePrimaryStringValue } from "../shared/string-coerce.js";
import type { AgentModelConfig } from "./types.agents-shared.js";

type AgentModelListLike = {
  primary?: string;
  fallbacks?: string[];
};

export function resolveAgentModelPrimaryValue(model?: AgentModelConfig): string | undefined {
  return resolvePrimaryStringValue(model);
}

export function resolveAgentModelFallbackValues(model?: AgentModelConfig): string[] {
  if (!model || typeof model !== "object") {
    return [];
  }
  return Array.isArray(model.fallbacks) ? model.fallbacks : [];
}

export function toAgentModelListLike(model?: AgentModelConfig): AgentModelListLike | undefined {
  if (typeof model === "string") {
    const primary = normalizeOptionalString(model);
    return primary ? { primary } : undefined;
  }
  if (!model || typeof model !== "object") {
    return undefined;
  }
  return model;
}