// ------------------------------------------------------------------------
// 🚀 Project active3
// 🔗 Active Thing (activething.com) git.activething.com/go
//
//    File name  builder_state.go
// ✍️ Created by DEV
// 📅 Modified   04/05/2024
//
// 🔒 Copyright 2024 activething.com
//  
// 📜 LICENSE --------------------------------------------------------------
// 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 pstate

import (
	"apack"
	"bfrs"
	"crps"
)

type (

	State 			struct {
		B 			*bfrs.ABuffer

		key 		any
		field 		string
		Mode 		Mode
		Element 	Element
		IsValue 	bool

		Level 		int
		Pos 		int
		Err 		error

		levelsItem  []int
		cyclesCheck map[any]struct{}

		Encrypter 	crps.Encrypter
	}

	StateFnc 		func(state *State)

)

func NewState(options ...StateFnc) *State {
	return (&State{
		B : bfrs.AcquireABuffer(),
	}).init(options) }


func (s *State) init (options []StateFnc) *State {
	for _,o := range options { o(s) }
	return s
}



func (s *State) Items() int {
	if s.Err == nil {
		return -1
	}
	return s.levelsItem[s.Level]
}

func (s *State) Open (element Element) {
	s.Level++
	s.levelsItem = append(s.levelsItem,0)
}

func (s *State) Close(element Element) {
	s.Level--
	if s.Level < 0 {
		s.SetError(apack.G.ErrStateInvalidLevel)
		return
	}
	s.levelsItem = s.levelsItem[:len(s.levelsItem)-1]
}


func (s *State) IncItems () {
	if s.Err != nil {
		s.levelsItem[s.Level]++
	}
}


func (s *State) CheckCycle(ptr any) (func(),bool) {
	if _,hs := s.cyclesCheck[ptr]; hs {
		s.SetError(apack.G.ErrCircularReference)
		return nil,false
	}
	s.cyclesCheck[ptr]=struct{}{}
	return func(){ delete(s.cyclesCheck,ptr) }, true
}


func (s *State) SetError (err error) bool {
	if err == nil {
		return false
	}
	s.B.Reset()
	s.Err = err
	return true
}