// Agent profile admission: the parent-side decision of whether a Fresh
// request satisfies the built-in subagent type rules. A Direct self-spawn is
// rejected; tool presentation remains outside this module. See CONTEXT.md
// "Agent profile admission".

import { BUILTIN_SUBAGENT_TYPES } from "./launch-policy.ts";

/** Decision for a spawn request against the Direct self-spawn rule. */
export type SelfSpawnDecision =
  | { allowed: true }
  | { blocked: true; hasAlternative: boolean };

export interface AgentProfileAdmission {
  classifySelfSpawn(currentAgent: string, requestedAgent: string): SelfSpawnDecision;
}

export function createAgentProfileAdmission(): AgentProfileAdmission {
  return {
    classifySelfSpawn(currentAgent: string, requestedAgent: string): SelfSpawnDecision {
      // Only a non-empty, matching request is a Direct self-spawn. Anything
      // else — including an unset parent or child identity — is allowed and
      // left to ordinary launch validation.
      const current = currentAgent.trim();
      const requested = requestedAgent.trim();
      if (!current || !requested || requested !== current) {
        return { allowed: true };
      }

      // With a fixed catalog there is always exactly one other type; an
      // unknown current identity also leaves both types available.
      const hasAlternative = BUILTIN_SUBAGENT_TYPES.some((type) => type.name !== current);
      return { blocked: true, hasAlternative };
    },
  };
}