export const dynamic = 'force-dynamic';

import { NextResponse } from 'next/server';
import { auth } from '@/auth';
import fs from 'fs/promises';
import path from 'path';

const MAX_BYTES = 2 * 1024 * 1024;
const ALLOWED_TYPES = new Set(['image/png', 'image/jpeg', 'image/webp', 'image/svg+xml']);
const EXT_BY_TYPE: Record<string, string> = {
  'image/png': 'png',
  'image/jpeg': 'jpg',
  'image/webp': 'webp',
  'image/svg+xml': 'svg',
};

function sanitizeSlug(value: string): string {
  return value
    .toLowerCase()
    .replace(/[^a-z0-9-]+/g, '-')
    .replace(/^-+|-+$/g, '')
    .slice(0, 48) || 'logo';
}

export async function POST(request: Request) {
  const session = await auth();
  if (!session?.user?.id) {
    return NextResponse.json({ error: 'Unauthorized' }, { status: 401 });
  }

  try {
    const formData = await request.formData();
    const file = formData.get('file');
    const integrationId = sanitizeSlug(String(formData.get('integrationId') || 'logo'));

    if (!(file instanceof File)) {
      return NextResponse.json({ error: 'Dosya bulunamadı' }, { status: 400 });
    }

    if (!ALLOWED_TYPES.has(file.type)) {
      return NextResponse.json(
        { error: 'Sadece PNG, JPG, WEBP veya SVG yüklenebilir' },
        { status: 400 },
      );
    }

    if (file.size > MAX_BYTES) {
      return NextResponse.json({ error: 'Dosya boyutu en fazla 2MB olabilir' }, { status: 400 });
    }

    const ext = EXT_BY_TYPE[file.type] || 'png';
    const filename = `${integrationId}-${Date.now()}.${ext}`;
    const uploadDir = path.join(process.cwd(), 'public', 'uploads', 'integrations');
    const filePath = path.join(uploadDir, filename);

    await fs.mkdir(uploadDir, { recursive: true });
    const buffer = Buffer.from(await file.arrayBuffer());
    await fs.writeFile(filePath, buffer);

    return NextResponse.json({
      url: `/uploads/integrations/${filename}`,
      filename,
    });
  } catch (error) {
    console.error('Logo upload failed:', error);
    return NextResponse.json({ error: 'Yükleme başarısız' }, { status: 500 });
  }
}