// ------------------------------------------------------------------------
//   Project active2
//   Active Thing (activething.com) git.activething.com/go
//
//   File name  value_provider.go
//   Created by DEV
//   Modified   19/03/2024
//
//   Copyright 2024 activething.com
// ------------------------------------------------------------------------
// 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 vals

type (

	Valuer interface {
		Value() any
	}

	ValueFnc func() any
)


func (f ValueFnc) Value() any {
	return f()
}



func AsValuer(value any) Valuer {
	if value == nil {
		return ValueFnc(nopValue)
	}
	switch v := value.(type) {
	case Valuer:
		return v
	case func() any:
		return ValueFnc(v)
	default:
		return ValueFnc(func() any { return value })
	}
}

func AsValue(value any) any {
	if value == nil {
		return nil
	}
	if vl, is := value.(Valuer); is {
		return vl.Value()
	}
	if vl, is := value.(func() any); is {
		return vl()
	}
	return value
}

func nopValue() any {
	return nil
}