// Copyright 2016-2019 aliiohs
//
// 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 hessian

import (
	big "github.com/dubbogo/gost/math/big"
)

func init() {
	RegisterPOJO(&big.Decimal{})
	SetSerializer("java.math.BigDecimal", DecimalSerializer{})
}

type Serializer interface {
	EncObject(*Encoder, POJO) error
	DecObject(*Decoder) (interface{}, error)
}

var serializerMap = make(map[string]Serializer, 16)

func SetSerializer(key string, codec Serializer) {
	serializerMap[key] = codec
}

func GetSerializer(key string) (Serializer, bool) {
	codec, ok := serializerMap[key]
	return codec, ok
}

type DecimalSerializer struct{}

func (DecimalSerializer) EncObject(e *Encoder, v POJO) error {
	decimal, ok := v.(big.Decimal)
	if !ok {
		return e.encObject(v)
	}
	decimal.Value = decimal.String()
	return e.encObject(decimal)
}

func (DecimalSerializer) DecObject(d *Decoder) (interface{}, error) {
	dec, err := d.DecodeValue()
	if err != nil {
		return nil, err
	}
	result, ok := dec.(*big.Decimal)
	if !ok {
		panic("result type is not decimal,please check the whether the conversion is ok")
	}
	err = result.FromString(result.Value)
	if err != nil {
		return nil, err
	}
	return result, nil
}