import { getClaudeClient } from './claudeClient';
import { getOpenAIClient } from './openaiClient';

let defaultProvider = 'claude'; // Prefer Anthropic as documented

export const setDefaultProvider = (provider: 'claude' | 'openai') => {
  defaultProvider = provider;
};

// Check which providers are available
const isProviderAvailable = (provider: 'claude' | 'openai'): boolean => {
  if (provider === 'claude') {
    return !!(process.env.ANTHROPIC_API_KEY || process.env.CLAUDE_API_KEY);
  }
  return !!process.env.OPENAI_API_KEY;
};

export const getLlmClient = () => {
  // Try default provider first
  if (isProviderAvailable(defaultProvider as 'claude' | 'openai')) {
    switch (defaultProvider) {
      case 'claude':
        return getClaudeClient();
      case 'openai':
        return getOpenAIClient();
    }
  }
  
  // Fallback to available provider
  if (defaultProvider !== 'claude' && isProviderAvailable('claude')) {
    console.warn('Primary LLM provider not available, falling back to Claude');
    return getClaudeClient();
  }
  
  if (defaultProvider !== 'openai' && isProviderAvailable('openai')) {
    console.warn('Primary LLM provider not available, falling back to OpenAI');
    return getOpenAIClient();
  }
  
  throw new Error('No LLM provider available. Please set ANTHROPIC_API_KEY or OPENAI_API_KEY environment variables.');
};