import { NextRequest, NextResponse } from 'next/server';
import { db } from '@/lib/db';
import { getCookieToken, getSessionUser } from '@/lib/auth';

export async function GET(request: NextRequest) {
  try {
    const token = getCookieToken(request);
    if (!token) {
      return NextResponse.json({ error: 'Not authenticated' }, { status: 401 });
    }
    const user = await getSessionUser(token);
    if (!user) {
      return NextResponse.json({ error: 'Not authenticated' }, { status: 401 });
    }

    // Free plan users cannot export JSON
    if (user.plan === 'free') {
      return NextResponse.json(
        { error: 'JSON export is available on Basic, Pro, and Enterprise plans. Please upgrade your plan.' },
        { status: 403 }
      );
    }

    const invoices = await db.invoice.findMany({
      where: { userId: user.id },
      orderBy: { createdAt: 'desc' },
    });

    const jsonData = invoices.map((inv) => ({
      id: inv.id,
      filename: inv.filename,
      vendor: inv.vendor,
      invoiceNumber: inv.invNumber,
      invoiceDate: inv.invDate,
      dueDate: inv.dueDate,
      subtotal: inv.amount,
      vatAmount: inv.vatAmount,
      total: inv.total,
      currency: inv.currency,
      status: inv.status,
      isDuplicate: inv.isDuplicate,
      confidence: inv.confidence,
      rawJson: inv.rawJson ? JSON.parse(inv.rawJson) : null,
      createdAt: inv.createdAt,
      updatedAt: inv.updatedAt,
    }));

    const timestamp = new Date().toISOString().split('T')[0];
    return new NextResponse(JSON.stringify(jsonData, null, 2), {
      status: 200,
      headers: {
        'Content-Type': 'application/json; charset=utf-8',
        'Content-Disposition': `attachment; filename="invoices-${timestamp}.json"`,
      },
    });
  } catch (error) {
    console.error('[EXPORT_JSON_ERROR]', error);
    return NextResponse.json(
      { error: 'Internal server error' },
      { status: 500 }
    );
  }
}