package http

import (
	"fmt"
	transPbV1 "gitea.drugeyes.vip/pharnexbase/utils/transport/v1"
	"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
	}

	// 重定向
	if rd, ok := v.(http.Redirector); ok {
		url, code := rd.Redirect()
		stdhttp.Redirect(w, r, url, code)
		return nil
	}

	// 文件下载
	if data, ok := v.(*transPbV1.FileResponse); ok {
		w.Header().Set("Content-Disposition", fmt.Sprintf("attachment; filename=\"%s\"", data.Filename))
		if data.Filetype != "" {
			w.Header().Set("Content-Type", data.Filetype)
		}
		w.Header().Set("Access-Control-Expose-Headers", "*")
		w.WriteHeader(stdhttp.StatusOK)
		w.Write(data.Data)

		return nil
	}

	codec, _ := http.CodecForRequest(r, "Accept")
	data, err := codec.Marshal(v)
	if err != nil {
		return err
	}

	w.Header().Set("Content-Type", ContentType(codec.Name()))

	d := fmt.Sprintf(`{"code": 200,"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 _, ok := err.(*errors.Error); !ok {
		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}, "/")
}