import { requireAuth } from '~/server/utils/auth'
import { prisma } from '~/server/utils/prisma'

export default defineEventHandler(async (event) => {
  const id = getRouterParam(event, 'id')
  if (!id) throw createError({ statusCode: 400, message: 'Canvas ID is required' })

  const canvas = await prisma.canvas.findUnique({ where: { id } })
  if (!canvas) throw createError({ statusCode: 404, message: 'Canvas not found' })

  if (canvas.isPublic) return canvas

  const user = requireAuth(event)

  if (canvas.ownerId === user.id) return canvas

  if (canvas.groupId) {
    const membership = await prisma.groupMember.findUnique({
      where: { userId_groupId: { userId: user.id, groupId: canvas.groupId } }
    })
    if (membership) return canvas
  }

  throw createError({ statusCode: 403, message: 'Access denied' })
})