export interface OrganizationInfo {
  orgId: string
  orgDomain: string
  role: string
}

function extractSubdomain(domain: string): string {
  const parts = domain.split('.')
  return parts.length > 1 ? parts[0] : domain
}


const STORAGE_KEY = 'policy-ui.selected-org-id'

export function useOrganizationSelection() {
  const { data: session } = useAuth()

  const organizations = computed<OrganizationInfo[]>(() => {
    const allOrgRoles = (session.value?.user as any)?.roles as  Record<string, Record<string, string>> | undefined
    if (!allOrgRoles) {
      return []
    }

    const result: OrganizationInfo[] = []
    for (const [role, orgMap] of Object.entries(allOrgRoles)) {
        for (const [orgId, orgDomain] of Object.entries(orgMap)) {
            if (!result.find(o => o.orgId === orgId)) {
                result.push({ orgId, orgDomain: orgDomain as string, role, orgSubDomain: extractSubdomain(orgDomain) })
            }
        }
    }
    result.sort((a, b) => a.orgDomain.localeCompare(b.orgDomain))
    return result
  })

  // All unique org IDs the user has access to
  const orgIds = computed<string[]>(() => organizations.value.map(o => o.orgId))

  // Persisted selected org
  const selectedOrgId = ref<string | null>(null)

  onMounted(() => {
    const stored = localStorage.getItem(STORAGE_KEY)
    if (stored && orgIds.value.includes(stored)) {
      selectedOrgId.value = stored
    } else if (organizations.value.length > 0 && !selectedOrgId.value) {
      const defaultOrgId = organizations.value[0]!.orgId
      selectedOrgId.value = defaultOrgId
      localStorage.setItem(STORAGE_KEY, defaultOrgId)
    }
  })

  watch(orgIds, (ids) => {
    if (ids.length > 0) {
      const firstId = ids[0]!
      if (!ids.includes(selectedOrgId.value ?? '')) {
        selectedOrgId.value = firstId
        localStorage.setItem(STORAGE_KEY, firstId)
      }
    }
  })

  const selectOrg = (orgId: string) => {
    selectedOrgId.value = orgId
    localStorage.setItem(STORAGE_KEY, orgId)
  }

  const selectedOrg = computed<OrganizationInfo | undefined>(() => {
    if (!selectedOrgId.value) return undefined
    return organizations.value.find(o => o.orgId === selectedOrgId.value)
  })

  return {
    organizations,
    selectedOrgId,
    selectedOrg,
    selectOrg,
  }
}