/**
 * Example: Basic Context Compaction
 * 
 * Demonstrates how to use context compaction to manage
 * conversation history within token limits.
 */

import { 
  ContextManager, 
  TokenCounter, 
  Summarizer 
} from '../agent-system';

async function basicCompaction() {
  // Initialize components with a 128k token budget
  const tokenCounter = new TokenCounter(128000);
  const summarizer = new Summarizer();
  
  const contextManager = new ContextManager(tokenCounter, summarizer, {
    maxTokens: 100000,          // Max tokens before compaction triggers
    compactionStrategy: 'hybrid', // Use all strategies combined
    slidingWindowSize: 50,       // Keep last 50 messages
    preserveRecentCount: 10,     // Keep last 10 messages verbatim
    priorityKeywords: [          // Always retain messages with these keywords
      'error', 'important', 'decision', 'critical', 'remember'
    ],
    reserveTokens: 20000         // Reserve for response generation
  });

  // Simulate a long conversation
  const messages = [
    { role: 'user' as const, content: 'I need to build a REST API for my application.' },
    { role: 'assistant' as const, content: 'I can help you design and implement a REST API. What features do you need?' },
    { role: 'user' as const, content: 'I need CRUD operations for users, products, and orders.' },
    { role: 'assistant' as const, content: 'Great! Let\'s design the API endpoints...' },
    // ... many more messages ...
  ];

  // Add messages to context
  for (const msg of messages) {
    contextManager.addMessage(msg);
  }

  // Check if compaction is needed
  if (contextManager.needsCompaction()) {
    console.log('Context is full, compacting...');
    
    const result = await contextManager.compact();
    
    console.log('Compaction result:');
    console.log(`  - Tokens saved: ${result.tokensSaved}`);
    console.log(`  - Messages removed: ${result.messagesRemoved}`);
    if (result.summary) {
      console.log(`  - Summary: ${result.summary.substring(0, 100)}...`);
    }
  }

  // Get active context for API call
  const activeContext = contextManager.getActiveContext();
  console.log(`Active context: ${activeContext.messages.length} messages`);
  console.log(`Token usage: ${tokenCounter.getUsagePercentage() * 100}%`);

  // Get token stats
  const stats = tokenCounter.getStats();
  console.log(`Token stats: ${stats.used}/${stats.total} (${stats.percentage}%)`);
}

// Run the example
basicCompaction().catch(console.error);