// ------------------------------------------------------------------------
//   Project active2
//   Active Thing (activething.com) git.activething.com/go
//
//   File name  active.go
//   Created by DEV
//   Modified   21/04/2024
//
//   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 cjson

import (
	"math"
	"strconv"
	"unicode/utf8"
)

var (

	G = struct {
		Hex       	string
		JSONChars 	[utf8.RuneSelf]CharAtt

		NullValue 	[]byte
		EmptyValue 	[]byte
		ZeroValue  	[]byte
		TrueValue  	[]byte
		FalseValue 	[]byte

		FloatNaN    []byte
		FloatInfPos []byte
		FloatInfNeg []byte
	} {

		Hex:       "0123456789abcdef",
		JSONChars: initJSONChars(),

		NullValue:  []byte{'n', 'u', 'l', 'l'},
		ZeroValue:  []byte{'0'},
		EmptyValue: []byte{'"','"'},
		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', '"'},
	}
)


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






func JSONFloat (f float64, bits int) string {
	var t [64]byte
	if math.IsInf(f, 0) || math.IsNaN(f) {
		return string(G.FloatNaN)
	}

	abs := math.Abs(f)
	fm := byte('f')

	if abs != 0 {
		if bits == 64 && (abs < 1e-6 || abs >= 1e21) || bits == 32 && (float32(abs) < 1e-6 || float32(abs) >= 1e21) {
			fm = 'e'
		}
	}
	bf := t[:0]
	bf = strconv.AppendFloat(bf, f, fm, -1, int(bits))
	if fm == 'e' {
		// clean up e-09 to e-9
		n := len(bf)
		if n >= 4 && bf[n-4] == 'e' && bf[n-3] == '-' && bf[n-2] == '0' {
			bf[n-2] = bf[n-1]
			bf = bf[:n-1]
		}
	}
	return string(bf)
}