package gummy

import (
	"bytes"
	"encoding/json"
	"io"

	"gitee.com/cruller/gummy/content"
)

func parseBody(contentType string, parames ...interface{}) (io.Reader, error) {
	if len(parames) == 0 {
		return nil, nil
	}
	var (
		data []byte
		err  error
	)
	switch content.Equal(contentType) {
	case content.None:
		return nil, nil
	case content.JSON:
		data, err = parseJSON(parames...)
	}
	if nil != err {
		return nil, err
	}
	if nil != data {
		return bytes.NewBuffer(data), nil
	}
	return nil, nil
}

func parseJSON(parames ...interface{}) ([]byte, error) {
	count := len(parames)
	if count == 0 {
		return nil, nil
	}
	val := parames[0]
	switch val.(type) {
	case string, []byte:
		var data []byte
		if str, dup := val.(string); dup {
			data = []byte(str)
		} else {
			data = val.([]byte)
		}
		var obj map[string]interface{}
		err := json.Unmarshal(data, &obj)
		if nil != err {
			return nil, err
		}
		val = obj
	}
	return json.Marshal(val)
}