src/app/api/chat/route.ts

// ═══════════════════════════════════════════════════════════════════════════
// CHAT API - Send and receive chat messages
// ═══════════════════════════════════════════════════════════════════════════

import { NextRequest, NextResponse } from 'next/server';
import { sessionManager } from '@/lib/session-manager';
import { storageService } from '@/lib/storage';

export const runtime = 'nodejs';
export const dynamic = 'force-dynamic';

export async function POST(request: NextRequest) {
  try {
    const body = await request.json();
    const { sessionId, userId, userName, message, isTeacher } = body;

    if (!sessionId || !userId || !userName || !message) {
      return NextResponse.json({ 
        success: false, 
        error: 'Missing required fields' 
      }, { status: 400 });
    }

    const chatMessage = await sessionManager.sendChatMessage(
      sessionId,
      userId,
      userName,
      message,
      isTeacher || false
    );

    return NextResponse.json({
      success: true,
      data: chatMessage
    });

  } catch (error) {
    console.error('Chat API error:', error);
    return NextResponse.json({ 
      success: false, 
      error: 'Internal server error' 
    }, { status: 500 });
  }
}

export async function GET(request: NextRequest) {
  try {
    const { searchParams } = new URL(request.url);
    const sessionId = searchParams.get('sessionId');

    if (!sessionId) {
      return NextResponse.json({ 
        success: false, 
        error: 'Missing sessionId' 
      }, { status: 400 });
    }

    const chatHistory = await storageService.getChatHistory(sessionId);

    return NextResponse.json({
      success: true,
      data: chatHistory
    });

  } catch (error) {
    console.error('Chat API error:', error);
    return NextResponse.json({ 
      success: false, 
      error: 'Internal server error' 
    }, { status: 500 });
  }
}