import type { NextRequest } from 'next/server';
import { authorizeLearningRuntime, runtimeUnauthorized } from '@/lib/makelore-runtime/auth';
import { loadMakeloreCourse, parseLearningBinding } from '@/lib/makelore-runtime/course-store';
import { isRuntimeOpenRequest } from '@/lib/makelore-runtime/protocol';

export async function POST(request: NextRequest) {
  if (!authorizeLearningRuntime(request)) return runtimeUnauthorized();
  const body: unknown = await request.json().catch(() => null);
  if (!isRuntimeOpenRequest(body)) return Response.json({ error: 'invalid_request' }, { status: 400 });
  const binding = parseLearningBinding(body.binding.key);
  if (!binding) return Response.json({ error: 'invalid_binding' }, { status: 400 });
  const course = await loadMakeloreCourse(binding.courseId, binding.contentHash);
  if (!course) return Response.json({ error: 'course_not_found' }, { status: 404 });
  return Response.json({
    type: 'learning.course.snapshot',
    schema_version: 1,
    binding_source_sequence: 0,
    payload: {
      courseId: course.courseId,
      contentHash: course.contentHash,
      title: course.title,
      sceneCount: course.sceneCount,
    },
  });
}