import { after, type NextRequest } from 'next/server';
import { nanoid } from 'nanoid';
import { createCourse, runCourseFrameworkGeneration } from '@/lib/course-framework/runner';
import { authorizeLearningRuntime, runtimeUnauthorized } from '@/lib/makelore-runtime/auth';
import {
  LEARNING_GENERATION_CONTRACT_VERSION,
  LearningGenerationRequestError,
  parseLearningGenerationRequest,
} from '@/lib/makelore-runtime/generation-request';
import { createClassroomGenerationJob } from '@/lib/server/classroom-job-store';
import { runClassroomGenerationJob } from '@/lib/server/classroom-job-runner';
import { buildRequestOrigin } from '@/lib/server/classroom-storage';

export const maxDuration = 300;

export async function POST(request: NextRequest) {
  if (!authorizeLearningRuntime(request)) return runtimeUnauthorized();
  try {
    const generation = await parseLearningGenerationRequest(request);
    const jobId = nanoid(10);
    const baseUrl = buildRequestOrigin(request);

    if (generation.mode === 'large') {
      await createCourse(jobId, generation.input, {
        ownerPrincipalId: generation.ownerUserId,
      });
      // Phase 1 only. The original Ops builder reviews the framework and calls
      // /api/courses/:id/start before the original per-module runner is used.
      after(() => runCourseFrameworkGeneration(jobId, baseUrl));
    } else {
      await createClassroomGenerationJob(jobId, generation.input, {
        ownerPrincipalId: generation.ownerUserId,
      });
      after(() => runClassroomGenerationJob(jobId, generation.input, baseUrl));
    }

    return Response.json(
      {
        contractVersion: LEARNING_GENERATION_CONTRACT_VERSION,
        jobId,
        status: 'queued',
        mode: generation.mode,
        done: false,
      },
      { status: 202 },
    );
  } catch (error) {
    if (error instanceof LearningGenerationRequestError) {
      return Response.json(
        { error: error.code, message: error.message },
        { status: error.status },
      );
    }
    return Response.json(
      {
        error: 'generation_request_failed',
        message: error instanceof Error ? error.message : 'Generation request failed',
      },
      { status: 500 },
    );
  }
}