// ------------------------------------------------------------------------
//   Project atila
//   Active Thing (activething.com) git.activething.com/go
//
//   File name  rkey.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 pjson

import (
	"encoding"
	"math"
	"packs"
	"reflect"
	"strconv"
)

func stringifyRKey(rt reflect.Type) rMapEntryFnc {
	fn,ok := g.keyersCache.Load(rt)
	if !ok {
		fn, _ = g.keyersCache.LoadOrStore(rt, _stringifyRKey(rt))
	}
	return fn.(rMapEntryFnc)
}


func _stringifyRKey(rt reflect.Type) rMapEntryFnc {

	if rt.Kind() == reflect.String {
		return func(e *rMapEntry, k reflect.Value) error {
			e.k = k.String()
			e.f = packs.FlagScapeHTML
			return nil
		}
	}

	if rt.Implements(g.textMarshalerType) {
		return func(e *rMapEntry, k reflect.Value) error {
			if k.Kind() == reflect.Pointer && k.IsNil() {
				return nil
			}
			bf, er := (k.Interface().(encoding.TextMarshaler)).MarshalText()
			if er == nil {
				e.k = string(bf)
				e.f = packs.FlagScapeHTML
			}
			return er
		}
	}

	switch rt.Kind() {

	case reflect.Int,
		reflect.Int8,
		reflect.Int16,
		reflect.Int32,
		reflect.Int64:
		return func(e *rMapEntry, k reflect.Value) error {
			e.k = strconv.FormatInt(k.Int(), 10)
			return nil
		}
	case reflect.Uint,
		reflect.Uint8,
		reflect.Uint16,
		reflect.Uint32,
		reflect.Uint64,
		reflect.Uintptr:
		return func(e *rMapEntry, k reflect.Value) error {
			e.k = strconv.FormatUint(k.Uint(), 10)
			return nil
		}

	case reflect.Interface:
		return func(e *rMapEntry, k reflect.Value) error {
			k = k.Elem()

			if k.Type().Kind() == reflect.String {
				e.k = k.String()
				e.f = packs.FlagScapeHTML
				return nil
			}

			if t,h := k.Interface().(encoding.TextMarshaler); h {
				if k.Type().Kind() == reflect.Pointer && k.IsNil() {
					return nil
				}
				bf, er := t.MarshalText()
				if er == nil {
					e.k = string(bf)
					e.f = packs.FlagScapeHTML
				}
				return er
			}

			switch rt.Kind() {

			case reflect.Int,
				reflect.Int8,
				reflect.Int16,
				reflect.Int32,
				reflect.Int64:
				e.k = strconv.FormatInt(k.Int(), 10)
				return nil

			case reflect.Uint,
				reflect.Uint8,
				reflect.Uint16,
				reflect.Uint32,
				reflect.Uint64,
				reflect.Uintptr:
				e.k = strconv.FormatUint(k.Uint(), 10)
				return nil

			default:
				return packs.G.ErrInvalidKey
			}
		}

	default:
		return nil
	}
}



func stringifyFloat (buffer []byte, f float64, bits int) []byte {
	if math.IsInf(f, 0) || math.IsNaN(f) {
		return nil
	}

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

	if abs != 0 {
		if bits == 64 && (abs < 1e-6 || abs >= 1e21) || bits == 32 && (float32(abs) < 1e-6 || float32(abs) >= 1e21) {
			fmt = 'e'
		}
	}
	buffer = strconv.AppendFloat(buffer[:0], f, fmt, -1, int(bits))
	if fmt == 'e' {
		// clean up e-09 to e-9
		n := len(buffer)
		if n >= 4 && buffer[n-4] == 'e' && buffer[n-3] == '-' && buffer[n-2] == '0' {
			buffer[n-2] = buffer[n-1]
			buffer = buffer[:n-1]
		}
	}
	return buffer
}