classroomio/apps/api/src/routes/course/lesson.ts

import { Hono } from '@api/utils/hono';
import { ZLessonDownloadContent } from '@cio/utils/validation/course';
import { courseMemberMiddleware } from '@api/middlewares/course-member';
import { generateLessonPdf } from '@api/utils/lesson';
import { zValidator } from '@hono/zod-validator';

export const lessonRouter = new Hono().post(
  '/download/pdf',
  courseMemberMiddleware,
  zValidator('json', ZLessonDownloadContent),
  async (c) => {
    const validatedData = c.req.valid('json');

    const pdfBuffer = await generateLessonPdf(validatedData);

    c.header('Content-Type', 'application/pdf');
    return c.body(
      new ReadableStream({
        start(controller) {
          controller.enqueue(pdfBuffer);
          controller.close();
        }
      })
    );
  }
);