package http

import (
	"fmt"
	"github.com/go-kratos/kratos/v2/errors"
	"github.com/go-kratos/kratos/v2/transport/http"
	stdhttp "net/http"
	"strings"
)

const (
	baseContentType = "application"
)

type Response struct {
	Code    int         `json:"code" form:"code"`
	Data    interface{} `json:"data" form:"data"`
	Reason  string      `json:"reason" form:"reason"`
	Message string      `json:"message" form:"message"`
}

func ResponseEncoder(w stdhttp.ResponseWriter, r *stdhttp.Request, v interface{}) error {
	if v == nil {
		return nil
	}

	codec, _ := http.CodecForRequest(r, "Accept")
	data, err := codec.Marshal(v)
	if err != nil {
		return err
	}
	application := strings.Join([]string{baseContentType, codec.Name()}, "/")

	w.Header().Set("Content-Type", application)

	d := fmt.Sprintf(`{"code": 0,"data": %s,"reason": "","message": ""}`, string(data))

	_, err = w.Write([]byte(d))
	if err != nil {
		return err
	}
	return nil
}

func ErrorEncoderPro(w stdhttp.ResponseWriter, r *stdhttp.Request, err error) {
	se := errors.FromError(err)
	if !errors.Is(err, &errors.Error{}) {
		se.Reason = "InternalServerError"
		se.Code = stdhttp.StatusInternalServerError
		se.Message = "internal server error"
	}

	codec, _ := http.CodecForRequest(r, "Accept")
	body, err := codec.Marshal(se)
	if err != nil {
		w.WriteHeader(stdhttp.StatusInternalServerError)
		return
	}
	w.Header().Set("Content-Type", ContentType(codec.Name()))
	w.WriteHeader(int(se.Code))
	_, _ = w.Write(body)
}

// ContentType returns the content-type with base prefix.
func ContentType(subtype string) string {
	return strings.Join([]string{baseContentType, subtype}, "/")
}