// ------------------------------------------------------------------------
//   Project atila
//   Active Thing (activething.com) git.activething.com/go
//
//   File name  packer_list.go
//   Created by DEV
//   Modified   05/02/2024
//
//   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 pkjson

import (
	"apacks"
	"codecs/cjson"
	"reflect"
)

type (

	rList struct {
		packFn  rPackerFnc
	}
)


func rListPacker (rtype reflect.Type) rPackerFnc {
	lp := *newRList(rtype)
	if rtype.Elem().Kind() != reflect.Uint8 {
		return lp.pack
	}
	if rtype.Kind() == reflect.Slice {
		return lp.packBinarySlice
	}
	return lp.packBinary
}






func newRList(rtype reflect.Type) *rList {
	return &rList{ packFn: rTypePacker(rtype.Elem()) }}



func (p rList) packBinary (s *apacks.State, v reflect.Value, f apacks.Flags) {
	if f.Binary() {
		packBinary(s, v.Interface().([]byte), f)
		return
	}
	p.pack(s,v,f)
}


func (p rList) packBinarySlice (s *apacks.State, v reflect.Value, f apacks.Flags) {
	if f.Binary() {
		packBinary(s, v.Interface().([]byte), f)
		return
	}
	p.packSlice(s,v,f)
}




func (p rList) packSlice(s *apacks.State, v reflect.Value, f apacks.Flags) {
	if v.IsNil() {
		s.W(cjson.G.NullValue)
		return
	}

	if s.Level > maxCyclesAfter {
		cp := struct {
			p interface{}
			l int
		}{
			p: v.UnsafePointer(),
			l: v.Len(),
		}
		if fn,ok := s.CheckCycle(cp); ok {
			defer fn()
		} else {
			s.SetError(apacks.G.ErrRedundantPack)
			return
		}
	}

	p.pack(s,v,f)
}



func (p rList) pack (s *apacks.State, v reflect.Value, f apacks.Flags) {
	if v.IsNil() {
		s.W(cjson.G.NullValue)
		return
	}

	if v.Len() == 0 {
		s.Write2Byte('[',']')
		return
	}

	s.Open('[')
	for i:=0; i<v.Len(); i++ {
		if i > 0 {
			s.WriteByte(',')
		}
		p.packFn(s,v.Index(i),f)
		if s.Error != nil {
			return
		}
	}
	s.Close(']')
}