/**
 * Example usage of the models library
 * This file demonstrates how to use the LLM routing library with different providers
 */

import models, { AIModelAPI, LLMChoice } from '../index';
import OpenAIResponses from '../src/openai-responses';

// Example configurations for different providers
const examples = {
  // Claude example
  claude: {
    description: 'Claude (Anthropic) example',
    setup: (): LLMChoice => ({ claude: 'claude-3-5-sonnet' }),
    envVars: ['ANTHROPIC_API_KEY']
  },

  // Gemini example
  gemini: {
    description: 'Gemini (Google) example',
    setup: (): LLMChoice => ({ gemini: 'gemini-2.5-pro' }),
    envVars: ['GOOGLE_API_KEY']
  },

  // ChatGPT example (using new OpenAI Responses API)
  chatgpt: {
    description: 'ChatGPT (OpenAI Responses API) example',
    setup: (): LLMChoice => ({ chatgpt: 'gpt-4o' }),
    envVars: ['OPENAI_API_KEY']
  },

  // Direct OpenAI Responses API example
  openaiResponses: {
    description: 'Direct OpenAI Responses API example',
    setup: (): AIModelAPI => new OpenAIResponses({
      baseURL: Bun.env.ZAI_BASE_URL || 'https://api.openai.com/v1',
      apiKey: Bun.env.ZAI_API_KEY || Bun.env.OPENAI_API_KEY || 'your-api-key-here',
      model: Bun.env.TEST_MODEL || 'gpt-4o',
      allowBrowser: true,
      tokenizer: (text: string) => text.length / 4, // Custom tokenizer
      maxTokens: 4000 // Custom max tokens
    }),
    envVars: ['ZAI_BASE_URL', 'ZAI_API_KEY', 'OPENAI_API_KEY', 'TEST_MODEL']
  },

  // DeepSeek example
  deepseek: {
    description: 'DeepSeek example',
    setup: (): LLMChoice => ({ deepseek: 'deepseek-chat' }),
    envVars: ['DEEPSEEK_API_KEY']
  },

  // Kimi example
  kimi: {
    description: 'Kimi (Moonshot) example',
    setup: (): LLMChoice => ({ kimi: 'moonshot-v1-8k' }),
    envVars: ['MOONSHOT_API_KEY']
  },

  // Grok example
  grok: {
    description: 'Grok (X.AI) example',
    setup: (): LLMChoice => ({ grok: 'grok-beta' }),
    envVars: ['XAI_API_KEY']
  },

  // Custom OpenAI-compatible API example
  custom: {
    description: 'Custom OpenAI-compatible API example',
    setup: (): LLMChoice => ({
      openai: {
        url: Bun.env.ZAI_BASE_URL || 'https://api.openai.com/v1',
        apiKey: Bun.env.ZAI_API_KEY || 'your-api-key-here',
        model: Bun.env.TEST_MODEL || 'glm-4.6',
        allowBrowser: true
      }
    }),
    envVars: ['ZAI_BASE_URL', 'ZAI_API_KEY', 'TEST_MODEL']
  }
};

// Run an example with a specific provider
async function runExample(providerName: keyof typeof examples) {
  const example = examples[providerName];

  console.log(`\n=== ${example.description} ===`);

  // Check required environment variables
  const missingVars = example.envVars.filter(varName => !Bun.env[varName]);
  if (missingVars.length > 0) {
    console.warn(`Warning: Missing environment variables: ${missingVars.join(', ')}`);
    console.warn('The example will be created but API calls will likely fail.');
  }

  try {
    // Create the API instance
    const setupResult = example.setup();
    let api: AIModelAPI;
    let configInfo: any;

    // Check if the setup returns an LLMChoice or direct AIModelAPI instance
    if (typeof setupResult === 'object' && 'send' in setupResult) {
      // Direct AIModelAPI instance
      api = setupResult;
      configInfo = 'Direct API instance';
    } else {
      // LLMChoice that needs to be passed to models()
      const choice = setupResult as LLMChoice;
      api = models(choice);
      configInfo = choice;
    }

    console.log(`✅ API instance created successfully`);
    console.log(`   Max tokens: ${api.maxTokens}`);
    console.log(`   Model: ${JSON.stringify(configInfo)}`);

    // Check if it's an OpenAI Responses API instance
    if (api instanceof OpenAIResponses) {
      console.log(`   Using OpenAI Responses API directly`);
    }

    // Test tokenization
    const testText = 'Hello, how are you today?';
    const tokens = api.tokenizer(testText);
    console.log(`   Tokenization: "${testText}" -> ${tokens} tokens`);

    // Test simple API call (will fail without valid credentials)
    console.log(`   Testing API call...`);
    try {
      const response = await api.send('Hello! Please respond with just "API working".');
      console.log(`   ✅ API response: ${response.substring(0, 100)}${response.length > 100 ? '...' : ''}`);
    } catch (error) {
      console.log(`   ❌ API call failed: ${error.message}`);
    }

    // Test streaming
    console.log(`   Testing streaming...`);
    try {
      const chunks: string[] = [];
      const handler = (chunk: string) => {
        chunks.push(chunk);
        process.stdout.write('.');
      };

      await new Promise<void>((resolve) => {
        api.stream('Count from 1 to 3', handler);
        setTimeout(() => {
          console.log(`\n   ✅ Streaming completed (${chunks.length} chunks)`);
          resolve();
        }, 3000);
      });
    } catch (error) {
      console.log(`   ❌ Streaming failed: ${error.message}`);
    }

  } catch (error) {
    console.error(`❌ Failed to create API instance: ${error.message}`);
  }
}

// Run all examples
async function runAllExamples() {
  console.log('🚀 Running LLM Models Library Examples\n');

  console.log('Environment Variables:');
  Object.keys(Bun.env)
    .filter(key => key.includes('API_KEY') || key.includes('BASE_URL') || key.includes('MODEL'))
    .forEach(key => {
      const value = Bun.env[key];
      console.log(`   ${key}: ${value ? '***set***' : 'not set'}`);
    });

  for (const providerName of Object.keys(examples) as (keyof typeof examples)[]) {
    await runExample(providerName);
  }

  console.log('\n✨ All examples completed!');
}

// Interactive example selector
async function interactiveExample() {
  console.log('\n📋 Available providers:');
  Object.entries(examples).forEach(([key, example]) => {
    console.log(`   ${key}: ${example.description}`);
  });

  const provider = process.argv[2];
  if (provider && provider in examples) {
    await runExample(provider as keyof typeof examples);
  } else {
    console.log('\nUsage: bun run example.ts [provider]');
    console.log('Available providers:', Object.keys(examples).join(', '));
    console.log('Or run without arguments to see all examples');
    await runAllExamples();
  }
}

// Test tokenization accuracy across providers
async function testTokenization() {
  console.log('\n🔢 Testing Tokenization Across Providers\n');

  const testTexts = [
    'Hello world',
    'The quick brown fox jumps over the lazy dog.',
    'This is a longer text with multiple sentences. It should have more tokens than shorter texts.',
    'Special chars: !@#$%^&*()_+-=[]{}|;:,.<>?/~`',
    'Unicode: Hello 🌍! 测试中文! Тест на русском! العربية!'
  ];

  for (const providerName of Object.keys(examples) as (keyof typeof examples)[]) {
    try {
      const example = examples[providerName];
      const choice = example.setup();
      const api = models(choice);

      console.log(`${providerName}:`);
      testTexts.forEach(text => {
        const tokens = api.tokenizer(text);
        console.log(`   "${text.substring(0, 50)}${text.length > 50 ? '...' : ''}" -> ${tokens} tokens`);
      });
      console.log('');
    } catch (error) {
      console.log(`${providerName}: Failed to initialize - ${error.message}\n`);
    }
  }
}

// Performance benchmark
async function performanceBenchmark() {
  console.log('\n⚡ Performance Benchmark\n');

  const testText = 'The quick brown fox jumps over the lazy dog. ';
  const iterations = 1000;

  for (const providerName of Object.keys(examples) as (keyof typeof examples)[]) {
    try {
      const example = examples[providerName];
      const choice = example.setup();
      const api = models(choice);

      const startTime = performance.now();
      for (let i = 0; i < iterations; i++) {
        api.tokenizer(testText + i);
      }
      const endTime = performance.now();

      const totalTime = endTime - startTime;
      const avgTime = totalTime / iterations;

      console.log(`${providerName}:`);
      console.log(`   ${iterations} tokenizations in ${totalTime.toFixed(2)}ms`);
      console.log(`   Average: ${avgTime.toFixed(3)}ms per tokenization`);
      console.log('');
    } catch (error) {
      console.log(`${providerName}: Failed to benchmark - ${error.message}\n`);
    }
  }
}

// Main execution
if (import.meta.main) {
  const command = process.argv[2];

  switch (command) {
    case 'tokenize':
      await testTokenization();
      break;
    case 'benchmark':
      await performanceBenchmark();
      break;
    case 'all':
      await runAllExamples();
      break;
    default:
      await interactiveExample();
  }
}

export { examples, runExample, runAllExamples, testTokenization, performanceBenchmark };