// ------------------------------------------------------------------------
// 🚀 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
		IsValue 	bool

		Level 		int
		levels 		[]StateLevel
		Current 	*StateLevel

		Pos 		int
		Err 		error

		cyclesCheck map[any]struct{}

		Encrypter 	crps.Encrypter
	}

	StateFnc 		func(state *State)

)



func AcquireState (options ...StateFnc) *State {
	return (g.statePool.Get()).init(options) }

func ReleaseState (state *State) {
	g.statePool.Put(state.reset()) }



func NewState(options ...StateFnc) *State {
	return (&State{
		B 	  : bfrs.NewABuffer(),
		levels: make([]StateLevel,g.levelsLen),
	}).init(options) }



func (s *State) init (options []StateFnc) *State {
	for _,o := range options { o(s) }
	s.levels[0].Ini(ModeValue,0)
	return s
}

func (s *State) reset () *State {
	s.B.Reset()
	s.key = nil
	s.field = ""
	s.IsValue = false
	s.Level = 0
	s.Pos  = 0
	s.Err  = nil
	s.cyclesCheck = nil
	s.Encrypter = nil
	for i := 0; i<len(s.levels); i++ {
		(&s.levels[i]).Ini(ModeNone,0)
	}
	s.levels = s.levels[:g.levelsLen]
	return s
}





func (s *State) Open (mode Mode) {
	s.Level++
	if s.Level > g.levelsLen {
		s.levels = append(s.levels, *((&(StateLevel{})).Ini(mode, s.B.Len())))
	} else {
		(&s.levels[s.Level]).Ini(mode, s.B.Len())
	}
	s.Current = &s.levels[s.Level]
}

func (s *State) Close(mode Mode) {
	s.Level--
	if s.Level < 0 {
		s.SetError(apack.G.ErrStateInvalidLevel)
		return
	}
	if s.levels[s.Level].Mode != mode {
		s.SetError(apack.G.ErrInvalidNode)
	}
	s.Current = &s.levels[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.reset()
	s.Err = err
	return true
}