import { NextResponse } from "next/server";
import { auth } from "@/auth";
import {
  createAssignment,
  listAssignments,
  validateCreateAssignmentInput,
} from "@/lib/assignments";

// Mirrors src/app/api/licenses/route.ts's pattern — middleware.ts excludes
// /api from route protection, so this checks the session itself. Flat
// permission model (CLAUDE.md): only "logged in or not", no role check.
export async function POST(request: Request): Promise<NextResponse> {
  const session = await auth();
  if (!session) {
    return NextResponse.json({ error: "Unauthorized" }, { status: 401 });
  }

  let body: unknown;
  try {
    body = await request.json();
  } catch {
    return NextResponse.json({ error: "Request body must be valid JSON" }, { status: 400 });
  }

  if (typeof body !== "object" || body === null) {
    return NextResponse.json({ error: "Request body must be a JSON object" }, { status: 400 });
  }

  const { employeeId, assetItemId, licenseId } = body as Record<string, unknown>;
  const validation = validateCreateAssignmentInput({ employeeId, assetItemId, licenseId });

  if (!validation.ok) {
    return NextResponse.json({ error: validation.error }, { status: 400 });
  }

  const created = await createAssignment(validation.value);
  if (!created.ok) {
    return NextResponse.json({ error: created.error }, { status: 400 });
  }
  return NextResponse.json(created.value, { status: 201 });
}

export async function GET(): Promise<NextResponse> {
  const session = await auth();
  if (!session) {
    return NextResponse.json({ error: "Unauthorized" }, { status: 401 });
  }

  const assignments = await listAssignments();
  return NextResponse.json(assignments, { status: 200 });
}