import { Router } from 'express'
import { asyncHandler } from '../utils/asyncHandler.js'
import { AppError } from '../middleware/error.js'
import { requireAuth } from '../middleware/auth.js'
import * as examRepo from '../repositories/examRepo.js'
import type { Request } from 'express'

const router = Router()

// GET /api/share/:token — public, no auth required
router.get(
  '/:token',
  asyncHandler(async (req: Request, res) => {
    const token = String(req.params.token)
    const exam = examRepo.getExamByShareToken(token)
    if (!exam) {
      throw new AppError(404, 'Shared exam not found')
    }
    const parsed = JSON.parse(exam.exam_json)
    res.json({
      title: exam.title,
      subtitle: exam.subtitle,
      questionCount: JSON.parse(exam.exam_json).questions?.length ?? 0,
      exam: parsed,
      shareMode: exam.share_mode ?? 'clone',
    })
  })
)

// POST /api/share/:token/clone — requires auth
router.post(
  '/:token/clone',
  requireAuth,
  asyncHandler(async (req: Request, res) => {
    const token = String(req.params.token)
    const source = examRepo.getExamByShareToken(token)
    if (!source) {
      throw new AppError(404, 'Shared exam not found')
    }
    const { id } = examRepo.cloneExam(req.user!.userId, source, token)
    res.status(201).json({ id, title: source.title + ' (copy)' })
  })
)

export default router