// ------------------------------------------------------------------------
//   Project atila
//   Active Thing (activething.com) git.activething.com/go
//
//   File name  gogo.go
//   Created by DEV
//   Modified   23/01/2024
//
//   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 pjson

import (
	"activething.com/go/gogo/core/opts"
	"activething.com/go/gogo/core/results"
	"activething.com/go/gogo/packs"
	"encoding"
	"encoding/json"
	"reflect"
	"sync"
	"unicode/utf8"
)


const (

	jsonTag   		= "json"

	maxCyclesAfter 	= 100

	defaultFlags 	= packs.Flags(0)
)



var (
	G = struct {
		hex       string
		jsonChars [utf8.RuneSelf]jsonCharAtt

		nullValue   []byte
		zeroValue   []byte
		trueValue   []byte
		falseValue  []byte

		floatNaN    []byte
		floatInfPos []byte
		floatInfNeg []byte


		packersCache sync.Map
		keyersCache  sync.Map
		fieldsCache  sync.Map

		jsonMarshalerType reflect.Type
		textMarshalerType reflect.Type
		packMarshalerType reflect.Type

	}{

		hex:       "0123456789abcdef",
		jsonChars: initJSONChars(),

		nullValue:   []byte{'n', 'u', 'l', 'l'},
		zeroValue:   []byte{'0'},
		trueValue:   []byte{'"','t', 'r', 'u', 'e','"'},
		falseValue:  []byte{'"','f', 'a', 'l', 's', 'e','"'},

		floatNaN:    []byte{'"', 'N', 'a', 'N', '"'},
		floatInfPos: []byte{'"', 'I', 'n', 'f', '"'},
		floatInfNeg: []byte{'"', '-', 'I', 'n', 'f', '"'},


		jsonMarshalerType: reflect.TypeOf((*json.Marshaler)(nil)).Elem(),
		textMarshalerType: reflect.TypeOf((*encoding.TextMarshaler)(nil)).Elem(),
		packMarshalerType: reflect.TypeOf((*packs.Packer)(nil)).Elem(),

	}
)


func initJSONChars() [utf8.RuneSelf]jsonCharAtt {
	var tb = [utf8.RuneSelf]jsonCharAtt{
		'"':  jsonCharAttAllUnsafe,
		'&':  jsonCharAttHtmlUnsafe,
		'<':  jsonCharAttHtmlUnsafe,
		'>':  jsonCharAttHtmlUnsafe,
		'\\': jsonCharAttAllUnsafe,
	}
	for i := 0; i <= 31; i++ {
		tb[i] = jsonCharAttAllUnsafe
	}
	return tb
}




func Pack (value any, options ... opts.OptionFnc[Packer]) (res results.Bytes) {
	p := NewPacker(options ...)
	p.Pack(value,defaultFlags)
	if p.Error() != nil {
		res = results.DoBytesError(p.Error())
	} else {
		res = results.DoBytesSuccess(p.Packet())
	}
	p.Release()
	return res
}