// Copyright 2014 Manu Martinez-Almeida.  All rights reserved.
// Use of this source code is governed by a MIT style
// license that can be found in the LICENSE file.

package json

import (
	"bytes"
	"fmt"
	"io"
	"net/http"

	"github.com/gin-gonic/gin/binding/common"
	"github.com/gin-gonic/gin/internal/json"
)

func init() {
	common.List[common.MIMEJSON] = jsonBinding{}
}

type jsonBinding struct{}

func (jsonBinding) Name() string {
	return "json"
}

func (jsonBinding) Bind(req *http.Request, obj interface{}) error {
	if req == nil || req.Body == nil {
		return fmt.Errorf("invalid request")
	}
	return decodeJSON(req.Body, obj)
}

func (jsonBinding) BindBody(body []byte, obj interface{}) error {
	return decodeJSON(bytes.NewReader(body), obj)
}

func decodeJSON(r io.Reader, obj interface{}) error {
	decoder := json.NewDecoder(r)
	if common.EnableDecoderUseNumber {
		decoder.UseNumber()
	}
	if err := decoder.Decode(obj); err != nil {
		return err
	}
	return common.Validate(obj)
}