/*
Copyright 2023 The Kubernetes Authors.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

package resolver

import (
	"k8s.io/apimachinery/pkg/runtime/schema"
	"k8s.io/kube-openapi/pkg/validation/spec"
)

// Combine combines the DefinitionsSchemaResolver with a secondary schema resolver.
// The resulting schema resolver uses the DefinitionsSchemaResolver for a GVK that DefinitionsSchemaResolver knows,
// and the secondary otherwise.
func (d *DefinitionsSchemaResolver) Combine(secondary SchemaResolver) SchemaResolver {
	return &combinedSchemaResolver{definitions: d, secondary: secondary}
}

type combinedSchemaResolver struct {
	definitions *DefinitionsSchemaResolver
	secondary   SchemaResolver
}

// ResolveSchema takes a GroupVersionKind (GVK) and returns the OpenAPI schema
// identified by the GVK.
// If the DefinitionsSchemaResolver knows the gvk, the DefinitionsSchemaResolver handles the resolution,
// otherwise, the secondary does.
func (r *combinedSchemaResolver) ResolveSchema(gvk schema.GroupVersionKind) (*spec.Schema, error) {
	if _, ok := r.definitions.gvkToRef[gvk]; ok {
		return r.definitions.ResolveSchema(gvk)
	}
	return r.secondary.ResolveSchema(gvk)
}