// ------------------------------------------------------------------------
//   Project active2
//   Active Thing (activething.com) git.activething.com/go
//
//   File name  scope.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

import "sync"

type (

	Scope 		struct {
		atts 	ScopeAtt
		parent 	KeyValueGetter
		values 	sync.Map
	}


	ScopeFnc func(*Scope)

)


func NewScope(options ...ScopeFnc) *Scope {
	return applyScopeOptions(&Scope{ parent: GetKeyValueFnc(nopGetKeyValue)}, options...) }


func (s *Scope) NewChildScope(options ...ScopeFnc) *Scope {
	return applyScopeOptions(&Scope{parent: s },options ...) }



func (s *Scope) Atts () ScopeAtt {
	return s.atts }



func (s *Scope) GetKeyValue(key any) (any, bool) {
	if key == nil {
		return nil, false
	}
	v, h := s.values.Load(key)
	if !h {
		v, h = s.parent.GetKeyValue(key)
	}
	if h {
		return AsValue(v), true
	}
	return nil, false
}


func (s *Scope) SetKeyValue(key any, value any) error {
	if key == nil {
		//todo error
	}
	if s.atts.IsReadOnly() {
		//todo error
	}
	s.values.Store(key, AsValuer(value))
	return nil
}


func (s *Scope) DelKeyValue (key any) {
	s.values.Delete(key) }




func (s *Scope) Range (f func(key, value any) bool) {
	s.values.Range(f) }


func (s *Scope) Reset () {
	s.values.Range(func(k,v any) bool {
		s.values.Delete(k)
		return true
	})
}