import { NextRequest, NextResponse } from 'next/server';
import UTASChatBot from '@/lib/chatbot';

export async function POST(request: NextRequest) {
  try {
    const { 
      message, 
      mode = 'general',
      history = [],
      conversationHistory = [], 
      systemPrompt = null,
      language = 'en'
    } = await request.json();

    if (!message || typeof message !== 'string') {
      return NextResponse.json({ 
        error: 'Message is required and must be a string' 
      }, { status: 400 });
    }

    // Initialize the chatbot with API key from environment
    const apiKey = process.env.OPENROUTER_API_KEY || '';
    const chatbot = new UTASChatBot(apiKey);

    // Generate AI response using OpenRouter
    const response = await chatbot.generateResponse(message);

    // Log the interaction for demo purposes
    console.log('UTAS Chat:', {
      timestamp: new Date().toISOString(),
      message: message.substring(0, 100),
      response: response.substring(0, 100)
    });

    return NextResponse.json({
      message: response,
      response: response, // for backward compatibility
      timestamp: new Date().toISOString(),
      source: 'UTAS AI Assistant'
    });

  } catch (error) {
    console.error('Chat API Error:', error);
    
    return NextResponse.json({
      message: "I apologize, but I'm experiencing technical difficulties. Please try again or contact UTAS directly at +61 3 6226 6200 or info@utas.edu.au for immediate assistance.",
      timestamp: new Date().toISOString(),
      source: 'UTAS AI Assistant',
      error: true
    }, { status: 500 });
  }
}

export async function GET() {
  return NextResponse.json({
    service: 'UTAS AI Chat Assistant',
    status: 'active',
    features: [
      'RAG-powered responses using UTAS knowledge base',
      'OpenRouter AI integration (when API key provided)',
      'Real-time course and program information',
      'Application guidance and support',
      'Campus and research information'
    ],
    endpoints: {
      POST: 'Send message and conversation history',
      GET: 'Service status and information'
    }
  });
}