import { NextRequest, NextResponse } from 'next/server';
import { getAuthService } from '@/lib/auth';
import { 
  DemoFaceValidationAdapter, 
  DemoAvatarGenerationAdapter,
  InMemoryAvatarGenerationRepository 
} from '@gridpilot/demo-infrastructure';
import { RequestAvatarGenerationUseCase } from '@gridpilot/media';

// Create singleton instances
const faceValidation = new DemoFaceValidationAdapter();
const avatarGeneration = new DemoAvatarGenerationAdapter();
const avatarRepository = new InMemoryAvatarGenerationRepository();

const requestAvatarGenerationUseCase = new RequestAvatarGenerationUseCase(
  avatarRepository,
  faceValidation,
  avatarGeneration
);

export async function POST(request: NextRequest) {
  try {
    const authService = getAuthService();
    const session = await authService.getCurrentSession();

    if (!session) {
      return NextResponse.json(
        { success: false, errorMessage: 'Not authenticated' },
        { status: 401 }
      );
    }

    const body = await request.json();
    const { facePhotoData, suitColor } = body;

    if (!facePhotoData) {
      return NextResponse.json(
        { success: false, errorMessage: 'No face photo provided' },
        { status: 400 }
      );
    }

    if (!suitColor) {
      return NextResponse.json(
        { success: false, errorMessage: 'No suit color selected' },
        { status: 400 }
      );
    }

    // Extract base64 data if it's a data URL
    let base64Data = facePhotoData;
    if (facePhotoData.startsWith('data:')) {
      base64Data = facePhotoData.split(',')[1] || facePhotoData;
    }

    const result = await requestAvatarGenerationUseCase.execute({
      userId: session.user.id,
      facePhotoData: base64Data,
      suitColor,
    });

    if (result.status === 'failed') {
      return NextResponse.json({
        success: false,
        errorMessage: result.errorMessage,
      });
    }

    return NextResponse.json({
      success: true,
      requestId: result.requestId,
      avatarUrls: result.avatarUrls,
    });
  } catch (error) {
    console.error('Avatar generation error:', error);
    return NextResponse.json(
      { 
        success: false, 
        errorMessage: error instanceof Error ? error.message : 'Failed to generate avatars' 
      },
      { status: 500 }
    );
  }
}