import OpenAI from 'openai';
import { AgentManager } from './agent-manager';
import { FilePersistenceAdapter } from './file-persistence-adapter';

let sharedAgentManager: AgentManager | null = null;
let sharedOpenAIClient: OpenAI | null = null;

export function getSharedOpenAIClient(): OpenAI {
  if (!sharedOpenAIClient) {
    sharedOpenAIClient = new OpenAI({
      apiKey: process.env.CZ_OPENAI_API_KEY || '',
    });
    console.log('Shared OpenAI client created for Responses API');
  }
  return sharedOpenAIClient;
}

export function getSharedAgentManager(): AgentManager {
  if (!sharedAgentManager) {
    // Legacy support - using AI SDK for backwards compatibility
    const { createOpenAI } = require('@ai-sdk/openai');
    const customOpenAI = createOpenAI({
      apiKey: process.env.CZ_OPENAI_API_KEY || '',
    });

    const persistenceAdapter = new FilePersistenceAdapter();
    sharedAgentManager = new AgentManager(customOpenAI.chat(process.env.MODEL_NAME || 'gpt-5'), persistenceAdapter);
    console.log('Shared Agent Manager created with file persistence');
  }

  return sharedAgentManager;
}

/**
 * Reset the shared singleton instances for testing purposes.
 * This should ONLY be called in test environments.
 */
export function resetSharedAgentManagerForTesting(): void {
  sharedAgentManager = null;
  sharedOpenAIClient = null;
  console.log('Shared Agent Manager and OpenAI client reset for testing');
}