// Copyright 2025 Google LLC
//
// 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 (
	yaml "github.com/goccy/go-yaml"
)

var _ yaml.InterfaceUnmarshaler = &DelayedUnmarshaler{}

// DelayedUnmarshaler is struct that saves the provided unmarshal function
// passed to UnmarshalYAML so it can be re-used later once the target interface
// is known.
type DelayedUnmarshaler struct {
	unmarshal func(interface{}) error
}

func (d *DelayedUnmarshaler) UnmarshalYAML(unmarshal func(interface{}) error) error {
	d.unmarshal = unmarshal
	return nil
}

func (d *DelayedUnmarshaler) Unmarshal(v interface{}) error {
	return d.unmarshal(v)
}