// 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 constraint

import (
	"encoding/json"

	"sigs.k8s.io/yaml"
)

// Constraints that needs to be satisfied.
type Constraints struct {
	Constraints []*Collection `json:"constraints"`
}

// Parse the given yaml bytes as a Constraint
func Parse(yamlBytes []byte) (*Constraints, error) {
	jsonBytes, err := yaml.YAMLToJSON(yamlBytes)
	if err != nil {
		return nil, err
	}

	c := &Constraints{}
	if err = json.Unmarshal(jsonBytes, c); err != nil {
		return nil, err
	}

	return c, nil
}
