import { NextRequest, NextResponse } from "next/server";
import { connectDB } from "@/lib/db";
import { Contract } from "@/models/Contract";
import { Client } from "@/models/Client";
import { getSessionClientId } from "@/lib/auth";
import { hasPermission } from "@/lib/adminAuth";
import { renderContractPdf } from "@/lib/contractPdf";
import { getSettings } from "@/lib/settings";
import { getContractTemplateSections } from "@/lib/actions/contractTemplates";
import { resolveSectionsForLocale } from "@/lib/contractTemplateDefaults";

export async function GET(_req: NextRequest, { params }: { params: Promise<{ contractId: string }> }) {
  const { contractId } = await params;
  const [clientId, isAdmin] = await Promise.all([getSessionClientId(), hasPermission("orders_view")]);
  if (!clientId && !isAdmin) return new NextResponse("Unauthorized", { status: 401 });

  await connectDB();
  const contract = await Contract.findById(contractId).lean();
  if (!contract || (!isAdmin && String(contract.clientId) !== clientId)) {
    return new NextResponse("Not found", { status: 404 });
  }

  const [orderClient, settings, sections] = await Promise.all([
    Client.findById(contract.clientId).lean(),
    getSettings(),
    getContractTemplateSections(contract.type),
  ]);
  const inv = settings.invoiceSettings;

  const buffer = await renderContractPdf(
    contract,
    {
      clientName: orderClient?.name || "",
      clientSalutation: orderClient?.salutation || "",
      clientEmail: orderClient?.email || "",
      clientStreet: orderClient?.billingStreet || "",
      clientPostCode: orderClient?.billingPostCode || "",
      clientCity: orderClient?.billingCity || "",
      photographerEmail: settings.socialLinks?.email || "contact@rakku.de",
      photographerInstagram: settings.socialLinks?.instagram || "",
      photographerWebsite: "rakku.de",
    },
    {
      businessName: inv?.businessName || "Rakku Photography",
      legalName: inv?.legalName || "",
      street: inv?.street || "",
      postCode: inv?.postCode || "",
      city: inv?.city || "",
      countryCode: inv?.countryCode || "DE",
    },
    resolveSectionsForLocale(sections, contract.locale === "en" ? "en" : "de")
  );
  return new NextResponse(new Uint8Array(buffer), {
    headers: {
      "Content-Type": "application/pdf",
      "Content-Disposition": `inline; filename="vertrag-${contractId}.pdf"`,
      "Cache-Control": "private, max-age=0, no-store",
    },
  });
}