/*
Copyright 2017 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 util

import (
	"fmt"
	"strings"

	"k8s.io/apimachinery/pkg/runtime"
	"k8s.io/apimachinery/pkg/runtime/schema"
	"k8s.io/apimachinery/pkg/runtime/serializer"
	clientsetscheme "k8s.io/client-go/kubernetes/scheme"
)

// MarshalToYaml marshals an object into yaml.
func MarshalToYaml(obj runtime.Object, gv schema.GroupVersion) ([]byte, error) {
	return MarshalToYamlForCodecs(obj, gv, clientsetscheme.Codecs)
}

// MarshalToYamlForCodecs marshals an object into yaml using the specified codec
func MarshalToYamlForCodecs(obj runtime.Object, gv schema.GroupVersion, codecs serializer.CodecFactory) ([]byte, error) {
	mediaType := "application/yaml"
	info, ok := runtime.SerializerInfoForMediaType(codecs.SupportedMediaTypes(), mediaType)
	if !ok {
		return []byte{}, fmt.Errorf("unsupported media type %q", mediaType)
	}

	encoder := codecs.EncoderForVersion(info.Serializer, gv)
	return runtime.Encode(encoder, obj)
}

// MarshalToYamlForCodecsWithShift adds spaces in front of each line so the indents line up
// correctly in the manifest
func MarshalToYamlForCodecsWithShift(obj runtime.Object, gv schema.GroupVersion, codecs serializer.CodecFactory) (string, error) {
	serial, err := MarshalToYamlForCodecs(obj, gv, codecs)
	if err != nil {
		return "", err
	}
	lines := strings.Split(string(serial), "\n")
	var newSerial string
	for _, line := range lines {
		newSerial = newSerial + "    " + line + "\n"
	}
	return newSerial, err
}