import { NextRequest, NextResponse } from 'next/server';
import { purchaseDb } from '@/lib/db';
import { notifyCustomerOfDecision } from '@/lib/telegram';

export async function PATCH(
  request: NextRequest,
  { params }: { params: Promise<{ id: string }> }
) {
  try {
    const { id } = await params;
    const purchaseId = parseInt(id);

    if (isNaN(purchaseId)) {
      return NextResponse.json(
        { error: 'Invalid purchase ID' },
        { status: 400 }
      );
    }

    const existing = purchaseDb.getById(purchaseId);
    if (!existing) {
      return NextResponse.json(
        { error: 'Purchase not found' },
        { status: 404 }
      );
    }
    if (existing.approvalStatus !== 'pending') {
      return NextResponse.json(
        { error: `Purchase is already ${existing.approvalStatus}` },
        { status: 409 }
      );
    }

    const purchase = purchaseDb.setStatus(purchaseId, 'approved');
    if (!purchase) {
      return NextResponse.json({ error: 'Purchase was reviewed concurrently' }, { status: 409 });
    }
    void notifyCustomerOfDecision(purchase).catch((error) => {
      console.error('Failed to notify Telegram customer:', error);
    });

    return NextResponse.json({
      success: true,
      message: 'Purchase approved successfully',
      purchase,
    });
  } catch (error: any) {
    console.error('Error approving purchase:', error);
    return NextResponse.json(
      { error: error.message || 'Failed to approve purchase' },
      { status: 500 }
    );
  }
}