feat: implement field mapping for ListDatabase API response

stackit/internal/services/postgresflexalpha/database/mapper.go

@@ -0,0 +1,47 @@
+package postgresflexalpha
+
+import (
+	"fmt"
+	"strings"
+
+	"github.com/hashicorp/terraform-plugin-framework/types"
+	"tf-provider.git.onstackit.cloud/stackit-dev-tools/terraform-provider-stackitprivatepreview/pkg_gen/postgresflexalpha"
+	postgresflexalpha2 "tf-provider.git.onstackit.cloud/stackit-dev-tools/terraform-provider-stackitprivatepreview/stackit/internal/services/postgresflexalpha/database/datasources_gen"
+)
+
+// mapFields maps fields from a ListDatabase API response to a DatabaseModel for the data source.
+func mapFields(resp *postgresflexalpha.ListDatabase, model *postgresflexalpha2.DatabaseModel, region string) error {
+	if resp == nil {
+		return fmt.Errorf("response is nil")
+	}
+	if resp.Id == nil || *resp.Id == 0 {
+		return fmt.Errorf("id not present")
+	}
+	if model == nil {
+		return fmt.Errorf("model input is nil")
+	}
+
+	var databaseId int64
+	if model.Id.ValueInt64() != 0 {
+		databaseId = model.Id.ValueInt64()
+	} else if resp.Id != nil {
+		databaseId = *resp.Id
+	} else {
+		return fmt.Errorf("database id not present")
+	}
+
+	model.Id = types.Int64Value(databaseId)
+	model.Name = types.StringPointerValue(resp.Name)
+	model.Region = types.StringValue(region)
+	model.Owner = types.StringPointerValue(cleanString(resp.Owner))
+	return nil
+}
+
+// cleanString removes leading and trailing quotes from a string pointer.
+func cleanString(s *string) *string {
+	if s == nil {
+		return nil
+	}
+	res := strings.Trim(*s, "\"")
+	return &res
+}