// Copyright 2019 Istio 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 pb

import (
	"strings"

	"github.com/ghodss/yaml"
	"github.com/gogo/protobuf/jsonpb"
	"github.com/gogo/protobuf/proto"
	yaml2 "gopkg.in/yaml.v2"
)

// UnmarshalData data into the proto.
func UnmarshalData(pb proto.Message, data interface{}) error {
	js, err := toJSON(data)
	if err == nil {
		u := jsonpb.Unmarshaler{AllowUnknownFields: true}
		err = u.Unmarshal(strings.NewReader(js), pb)
	}
	return err
}

func toJSON(data interface{}) (string, error) {

	var result string
	b, err := yaml2.Marshal(data)
	if err == nil {
		if b, err = yaml.YAMLToJSON(b); err == nil {
			result = string(b)
		}
	}

	return result, err
}
