fix: ensure mutual exclusivity

- Adds use of `ConflictsWith` for `r/hcx_vmc` for `sddc_id` and `sddc_name` to ensure mutual exclusivity.
- Adds use of `ExactlyOneO` for `r/hcx_vmc` for `sddc_id` and `sddc_name` to ensure at least one of them is provided.

Signed-off-by: Ryan Johnson <[email protected]>

docs/resources/vmc.md

@@ -24,10 +24,10 @@ resource "hcx_site_pairing" "example" {
 
 ## Argument Reference
 
-* `sddc_name` - (Optional) The name of the SDDC. Either `sddc_name` or `sddc_id`
-  must be specified.
-* `sddc_id` - (Optional) The ID of the SDDC. Either `sddc_id` or `sddc_name`
-  must be specified.
+* `sddc_name` - (Optional) Specifies the name of the SDDC.
+* `sddc_id` - (Optional) Specifies the ID of the SDDC.
+
+~> **NOTE:** Either `sddc_name` or `sddc_id` **must** be provided, but not both.
 
 ## Attribute Reference
 

resource_vmc.go

@@ -25,14 +25,18 @@ func resourceVmc() *schema.Resource {
 
 		Schema: map[string]*schema.Schema{
 			"sddc_id": {
-				Type:        schema.TypeString,
-				Description: "The ID of the SDDC.",
-				Optional:    true,
+				Type:          schema.TypeString,
+				Description:   "The ID of the SDDC.",
+				Optional:      true,
+				ConflictsWith: []string{"sddc_name"},            // Ensures mutual exclusivity.
+				ExactlyOneOf:  []string{"sddc_id", "sddc_name"}, // Enforces that at least one of them is provided.
 			},
 			"sddc_name": {
-				Type:        schema.TypeString,
-				Description: "The name of the SDDC.",
-				Optional:    true,
+				Type:          schema.TypeString,
+				Description:   "The name of the SDDC.",
+				Optional:      true,
+				ConflictsWith: []string{"sddc_id"},              // Ensures mutual exclusivity.
+				ExactlyOneOf:  []string{"sddc_id", "sddc_name"}, // Enforces that at least one of them is provided.
 			},
 			"cloud_url": {
 				Type:        schema.TypeString,
@@ -62,10 +66,6 @@ func resourceVmcCreate(ctx context.Context, d *schema.ResourceData, m interface{
 	sddcName := d.Get("sddc_name").(string)
 	sddcID := d.Get("sddc_id").(string)
 
-	if sddcName == "" && sddcID == "" {
-		return diag.Errorf("SDDC name or Id must be specified")
-	}
-
 	// Authenticate with VMware Cloud Services
 	accessToken, err := hcx.VmcAuthenticate(token)
 	if err != nil {