import { NextResponse } from "next/server";
import type { NextRequest } from "next/server";
import { getSessionClientId } from "@/lib/auth";
import { isAdminSession, hasPermission } from "@/lib/adminAuth";
import { getVisibleIntranetArticles } from "@/lib/intranetList";
import { createIntranetArticleAction } from "@/lib/actions/intranet";
import { connectDB } from "@/lib/db";
import { Department } from "@/models/Department";
import { corsHeaders, corsPreflight } from "@/lib/teamApiCors";

export async function OPTIONS(request: NextRequest) {
  return corsPreflight(request);
}

// Kein permission-Gate wie im Web-Admin — Intranet-Ansehen ist für jede:n
// eingeloggte:n Mitarbeiter:in immer erlaubt, siehe Kommentar in
// admin/intranet/page.tsx.
export async function GET(request: NextRequest) {
  const headers = corsHeaders(request);
  const viewerId = await getSessionClientId();
  if (!viewerId || !(await isAdminSession())) {
    return NextResponse.json({ error: "Nicht angemeldet." }, { status: 401, headers });
  }
  const [canCreate, canEdit, canDelete] = await Promise.all([
    hasPermission("intranet_create"),
    hasPermission("intranet_edit"),
    hasPermission("intranet_delete"),
  ]);
  const items = await getVisibleIntranetArticles(viewerId, canEdit);
  await connectDB();
  const departments = (await Department.find({}).sort({ sortOrder: 1 }).lean()).map((d) => ({
    _id: String(d._id),
    name: d.name,
    color: d.color,
  }));
  return NextResponse.json({ items, departments, canCreate, canEdit, canDelete }, { headers });
}

export async function POST(request: NextRequest) {
  const headers = corsHeaders(request);
  const clientId = await getSessionClientId();
  if (!clientId || !(await isAdminSession())) {
    return NextResponse.json({ error: "Nicht angemeldet." }, { status: 401, headers });
  }
  const body = await request.json().catch(() => null);
  const formData = new FormData();
  formData.set("title", typeof body?.title === "string" ? body.title : "");
  formData.set("content", typeof body?.content === "string" ? body.content : "");
  formData.set("category", typeof body?.category === "string" ? body.category : "");
  for (const id of Array.isArray(body?.departmentIds) ? body.departmentIds : []) formData.append("departmentIds", String(id));
  if (body?.pinned) formData.set("pinned", "on");
  formData.set("visible", body?.visible === false ? "" : "on");

  const result = await createIntranetArticleAction({}, formData);
  if (result?.error) return NextResponse.json({ error: result.error }, { status: 400, headers });
  return NextResponse.json({ ok: true }, { headers });
}