import { FREE_MODELS, FREE_ROLES } from "../config/defaults.js";

export { FREE_MODELS, FREE_ROLES };

export interface FreeMapping { model?: string; enabled: boolean; reason?: string }

/**
 * Which of the reference free models the host actually has configured. This is discovery
 * for the installer, not policy: what a run may use is whatever `models.tiers` declares.
 */
export function discoverFreeModels(available: readonly string[]): Record<keyof typeof FREE_ROLES, FreeMapping> {
  const roster = new Set(available);
  const critical = roster.has(FREE_ROLES.normal);
  return {
    scout: roster.has(FREE_ROLES.scout)
      ? { model: FREE_ROLES.scout, enabled: true }
      : critical
        ? { model: FREE_ROLES.normal, enabled: true, reason: `fallback:missing:${FREE_ROLES.scout}` }
        : { enabled: false, reason: `missing:${FREE_ROLES.scout}` },
    normal: critical ? { model: FREE_ROLES.normal, enabled: true } : { enabled: false, reason: `missing:${FREE_ROLES.normal}` },
    deep: critical ? { model: FREE_ROLES.deep, enabled: true } : { enabled: false, reason: `missing:${FREE_ROLES.deep}` },
  };
}