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

export default defineEventHandler(async (event) => {
  const user = requireAuth(event)
  const groupId = getRouterParam(event, 'id')!

  const group = await prisma.group.findUnique({ where: { id: groupId } })
  if (!group) throw createError({ statusCode: 404, message: 'Group not found' })
  if (group.ownerId === user.id) throw createError({ statusCode: 400, message: 'Owner cannot leave group. Delete it instead.' })

  const membership = await prisma.groupMember.findUnique({
    where: { userId_groupId: { userId: user.id, groupId } }
  })
  if (!membership) throw createError({ statusCode: 400, message: 'Not a member' })

  await prisma.groupMember.delete({ where: { id: membership.id } })

  return { success: true, message: `Left group "${group.name}"` }
})