import { NextRequest, NextResponse } from 'next/server';
import { generateQuotationPreviewPdf } from '@/features/foundation/pdf-generator/server/service';
import {
  auditCrmSecurityEvent,
  buildCrmSecurityContext,
  canViewQuotationPricing
} from '@/features/crm/security/server/service';
import { PERMISSIONS } from '@/lib/auth/rbac';
import { AuthError, requireOrganizationAccess } from '@/lib/auth/session';

type Params = {
  params: Promise<{ id: string }>;
};

export async function GET(request: NextRequest, { params }: Params) {
  try {
    const { id } = await params;
    const templateVariant = request.nextUrl.searchParams.get('templateVariant');

    if (templateVariant && templateVariant !== 'product-v1') {
      return NextResponse.json({ message: 'Unsupported template variant' }, { status: 400 });
    }

    const { organization, session, membership } = await requireOrganizationAccess({
      permission: PERMISSIONS.crmQuotationPdfPreview
    });
    const securityContext = buildCrmSecurityContext({
      organizationId: organization.id,
      userId: session.user.id,
      membership
    });

    if (!canViewQuotationPricing(securityContext)) {
      await auditCrmSecurityEvent({
        organizationId: organization.id,
        userId: session.user.id,
        action: 'pricing_hidden',
        entityType: 'crm_quotation',
        entityId: id,
        reason: 'Quotation PDF preview requires pricing visibility'
      });
      return NextResponse.json({ message: 'Forbidden' }, { status: 403 });
    }

    const pdf = await generateQuotationPreviewPdf(id, organization.id, {
      templateVariant
    });

    return new NextResponse(pdf.buffer, {
      headers: {
        'Content-Type': 'application/pdf',
        'Content-Disposition': `inline; filename="${pdf.fileName}"`
      }
    });
  } catch (error) {
    if (error instanceof AuthError) {
      return NextResponse.json({ message: error.message }, { status: error.status });
    }
    return NextResponse.json({ message: 'Unable to generate preview PDF' }, { status: 500 });
  }
}