fix: refactor sqlserver handle optional encryption (#27)

## Description

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relates to #1234

## Checklist

- [ ] Issue was linked above
- [ ] Code format was applied: `make fmt`
- [ ] Examples were added / adjusted (see `examples/` directory)
- [x] Docs are up-to-date: `make generate-docs` (will be checked by CI)
- [ ] Unit tests got implemented or updated
- [ ] Acceptance tests got implemented or updated (see e.g. [here](f5f99d1709/stackit/internal/services/dns/dns_acc_test.go))
- [x] Unit tests are passing: `make test` (will be checked by CI)
- [x] No linter issues: `make lint` (will be checked by CI)

Reviewed-on: #27
Co-authored-by: Marcel S. Henselin <marcel.henselin@stackit.cloud>
Co-committed-by: Marcel S. Henselin <marcel.henselin@stackit.cloud>

stackit/internal/services/sqlserverflexalpha/instance/functions.go

@@ -175,12 +175,18 @@ func toCreatePayload(
 		storagePayload.Size = conversion.Int64ValueToPointer(storage.Size)
 	}
 
-	encryptionPayload := &sqlserverflex.CreateInstanceRequestPayloadGetEncryptionArgType{}
+	var encryptionPayload *sqlserverflex.CreateInstanceRequestPayloadGetEncryptionArgType
-	if encryption != nil {
+	if encryption != nil &&
-		encryptionPayload.KekKeyId = conversion.StringValueToPointer(encryption.KeyId)
+		!encryption.KeyId.IsNull() && !encryption.KeyId.IsUnknown() &&
-		encryptionPayload.KekKeyVersion = conversion.StringValueToPointer(encryption.KeyVersion)
+		!encryption.KeyRingId.IsNull() && !encryption.KeyRingId.IsUnknown() &&
-		encryptionPayload.KekKeyRingId = conversion.StringValueToPointer(encryption.KeyRingId)
+		!encryption.KeyVersion.IsNull() && !encryption.KeyVersion.IsUnknown() &&
-		encryptionPayload.ServiceAccount = conversion.StringValueToPointer(encryption.ServiceAccount)
+		!encryption.ServiceAccount.IsNull() && !encryption.ServiceAccount.IsUnknown() {
+		encryptionPayload = &sqlserverflex.CreateInstanceRequestPayloadGetEncryptionArgType{
+			KekKeyId:       conversion.StringValueToPointer(encryption.KeyId),
+			KekKeyRingId:   conversion.StringValueToPointer(encryption.KeyVersion),
+			KekKeyVersion:  conversion.StringValueToPointer(encryption.KeyRingId),
+			ServiceAccount: conversion.StringValueToPointer(encryption.ServiceAccount),
+		}
 	}
 
 	var aclElements []string

stackit/internal/wait/sqlserverflexalpha/wait.go

@@ -16,12 +16,15 @@ import (
 	sqlserverflex "tf-provider.git.onstackit.cloud/stackit-dev-tools/terraform-provider-stackitprivatepreview/pkg_gen/sqlserverflexalpha"
 )
 
+// READY, PENDING, PROGRESSING, FAILURE, UNKNOWN,
 const (
-	InstanceStateEmpty      = ""
+	InstanceStateEmpty       = ""
-	InstanceStateProcessing = "Progressing"
+	InstanceStateSuccess     = "READY"
-	InstanceStateUnknown    = "Unknown"
+	InstanceStatePending     = "PENDING"
-	InstanceStateSuccess    = "Ready"
+	InstanceStateProcessing  = "PROGRESSING"
-	InstanceStateFailed     = "Failed"
+	InstanceStateFailed      = "FAILURE"
+	InstanceStateUnknown     = "UNKNOWN"
+	InstanceStateTerminating = "TERMINATING"
 )
 
 // APIClientInstanceInterface Interface needed for tests