/*
Copyright 2022 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 testing

import (
	"io/ioutil"
	"os"
	"path/filepath"
	"sync"

	openapi_v3 "github.com/google/gnostic/openapiv3"
)

type FakeV3 struct {
	Path string

	lock      sync.Mutex
	documents map[string]*openapi_v3.Document
	errors    map[string]error
}

func (f *FakeV3) OpenAPIV3Schema(groupVersion string) (*openapi_v3.Document, error) {
	f.lock.Lock()
	defer f.lock.Unlock()

	if existing, ok := f.documents[groupVersion]; ok {
		return existing, nil
	} else if existingError, ok := f.errors[groupVersion]; ok {
		return nil, existingError
	}

	_, err := os.Stat(f.Path)
	if err != nil {
		return nil, err
	}
	spec, err := ioutil.ReadFile(filepath.Join(f.Path, groupVersion+".json"))
	if err != nil {
		return nil, err
	}

	if f.documents == nil {
		f.documents = make(map[string]*openapi_v3.Document)
	}

	if f.errors == nil {
		f.errors = make(map[string]error)
	}

	result, err := openapi_v3.ParseDocument(spec)
	if err != nil {
		f.errors[groupVersion] = err
		return nil, err
	}

	f.documents[groupVersion] = result
	return result, nil
}
