import type { AdminNavigationItem } from '@admin/types/navigation'

export interface AdminNavigationGroup {
  label: string | null
  icon?: AdminNavigationItem['icon']
  items: AdminNavigationItem[]
}

export function groupAdminNavigationItems(items: AdminNavigationItem[]): AdminNavigationGroup[] {
  const groups: AdminNavigationGroup[] = []
  const groupMap = new Map<string | null, AdminNavigationItem[]>()

  for (const item of items) {
    const key = item.group ?? null
    let groupItems = groupMap.get(key)
    if (!groupItems) {
      const arr: AdminNavigationItem[] = []
      groupMap.set(key, arr)
      groups.push({ label: key, icon: item.groupIcon, items: arr })
      groupItems = arr
    }
    groupItems.push(item)
  }

  return groups
}