// ═══════════════════════════════════════════════════════════════════════════
// DOUBT API - Submit doubts, Solve doubts
// ═══════════════════════════════════════════════════════════════════════════

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

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

export async function POST(request: NextRequest) {
  try {
    const body = await request.json();
    const { action, sessionId, studentId, studentName, question, image, slideNumber, doubtId, annotatedImage, teacherResponse } = body;

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

    // CREATE DOUBT
    if (action === 'create') {
      if (!studentId || !studentName || !question) {
        return NextResponse.json({ 
          success: false, 
          error: 'Missing required fields for doubt creation' 
        }, { status: 400 });
      }

      const doubt = await sessionManager.createDoubt(
        sessionId,
        studentId,
        studentName,
        question,
        image,
        slideNumber
      );

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

    // SOLVE DOUBT
    if (action === 'solve') {
      if (!doubtId) {
        return NextResponse.json({ 
          success: false, 
          error: 'Missing doubtId' 
        }, { status: 400 });
      }

      const doubt = await sessionManager.solveDoubt(
        sessionId,
        doubtId,
        annotatedImage,
        teacherResponse
      );

      if (!doubt) {
        return NextResponse.json({ 
          success: false, 
          error: 'Doubt not found' 
        }, { status: 404 });
      }

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

    // UPDATE STATUS
    if (action === 'update_status') {
      if (!doubtId) {
        return NextResponse.json({ 
          success: false, 
          error: 'Missing doubtId' 
        }, { status: 400 });
      }

      // Broadcast update
      await sessionManager.broadcast(sessionId, 'doubt_update', {
        doubtId,
        status: body.status
      });

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

    return NextResponse.json({ 
      success: false, 
      error: 'Invalid action' 
    }, { status: 400 });

  } catch (error) {
    console.error('Doubt 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 doubts = sessionManager.getDoubts(sessionId);

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

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