fix: update outputs

outputs.tf

@@ -1,49 +1,49 @@
 output "vnet_id" {
-  value       = azurerm_virtual_network.vnet[*].id
+  value       = azurerm_virtual_network.vnet[0].id
   description = "The id of the newly created vNet"
 }
 
 output "vnet_name" {
-  value       = azurerm_virtual_network.vnet[*].name
+  value       = azurerm_virtual_network.vnet[0].name
   description = "The name of the newly created vNet"
 }
 
 output "vnet_location" {
-  value       = azurerm_virtual_network.vnet[*].location
+  value       = azurerm_virtual_network.vnet[0].location
   description = "The location of the newly created vNet"
 }
 
 output "vnet_address_space" {
-  value       = azurerm_virtual_network.vnet[*].address_space
+  value       = azurerm_virtual_network.vnet[0].address_space
   description = "The address space of the newly created vNet"
 }
 
 output "vnet_guid" {
-  value       = azurerm_virtual_network.vnet[*].guid
+  value       = azurerm_virtual_network.vnet[0].guid
   description = "The GUID of the virtual network."
 }
 
 output "vnet_rg_name" {
-  value       = azurerm_virtual_network.vnet[*].resource_group_name
+  value       = azurerm_virtual_network.vnet[0].resource_group_name
   description = "The name of the resource group in which to create the virtual network. Changing this forces a new resource to be created"
 }
 
 output "ddos_protection_plan_id" {
-  value       = join("", azurerm_network_ddos_protection_plan.example[*].id)
+  value = var.enable_ddos_pp && var.enable ? azurerm_network_ddos_protection_plan.example[0].id : null
   description = "The ID of the DDoS Protection Plan"
 }
 
 output "network_watcher_id" {
-  value       = join("", azurerm_network_watcher.flow_log_nw[*].id)
+  value = var.enable && var.enable_network_watcher ? azurerm_network_watcher.flow_log_nw[0].id : null
   description = "The ID of the Network Watcher."
 }
 
 output "network_watcher_name" {
-  value       = join("", azurerm_network_watcher.flow_log_nw[*].name)
+  value = var.enable && var.enable_network_watcher ? azurerm_network_watcher.flow_log_nw[0].name : null
   description = "The name of Network Watcher deployed."
 }
 
 output "ddos_existing_plan_id" {
-  value       = azurerm_virtual_network.vnet[*].ddos_protection_plan
+  value       = azurerm_virtual_network.vnet[0].ddos_protection_plan
   description = "The ID of the DDoS Protection Plan"
 }