package http

import (
	"encoding/hex"
	"fmt"
	"gitea.drugeyes.vip/pharnexbase/utils/enum"
	transPbV1 "gitea.drugeyes.vip/pharnexbase/utils/transport/v1"
	"github.com/go-kratos/kratos/v2/errors"
	"github.com/go-kratos/kratos/v2/transport/http"
	"github.com/tjfoc/gmsm/sm4"
	stdhttp "net/http"
	"strings"
)

const (
	baseContentType = "application"
)

var ErrInternalServer = errors.InternalServer("InternalServerError", "服务错误")

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 (t *Transport) ResponseEncoder() http.EncodeResponseFunc {
	return func(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()))
		w.Header().Set("Access-Control-Expose-Headers", "Traceid, En ,Content-Disposition, Authorization")

		d := fmt.Sprintf(`{"code": 200,"data": %s,"reason": "","message": ""}`, string(data))

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

func (t *Transport) ResponseEncoderWithEncrypt() http.EncodeResponseFunc {
	return func(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
		}

		dataRes := string(data)
		// 正式服加密
		if t.env == enum.Env_production {
			ecbMsg, err := sm4.Sm4Ecb([]byte(t.sm4Key), data, true)
			if err == nil {
				dataRes = fmt.Sprintf("\"%s\"", hex.EncodeToString(ecbMsg))
				w.Header().Set("en", "4")
			}
		}

		w.Header().Set("Content-Type", ContentType(codec.Name()))
		w.Header().Set("Access-Control-Expose-Headers", "Traceid, En ,Content-Disposition, Authorization")

		d := fmt.Sprintf(`{"code": 200,"data": %s,"reason": "","message": ""}`, dataRes)

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

func (t *Transport) ResponseEncoderWithEncryptFilter(noEncrypt map[string]bool) http.EncodeResponseFunc {
	return func(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
		}

		dataRes := string(data)
		// 正式服加密
		if t.env == enum.Env_production && !noEncrypt[r.URL.Path] {
			ecbMsg, err := sm4.Sm4Ecb([]byte(t.sm4Key), data, true)
			if err == nil {
				dataRes = fmt.Sprintf("\"%s\"", hex.EncodeToString(ecbMsg))
				w.Header().Set("en", "4")
			}
		}

		w.Header().Set("Content-Type", ContentType(codec.Name()))
		w.Header().Set("Access-Control-Expose-Headers", "Traceid, En ,Content-Disposition, Authorization")

		d := fmt.Sprintf(`{"code": 200,"data": %s,"reason": "","message": ""}`, dataRes)

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

func (t *Transport) ErrorEncoder() http.EncodeErrorFunc {
	return func(w stdhttp.ResponseWriter, r *stdhttp.Request, err error) {
		se := errors.FromError(err)
		if t.env == enum.Env_production {
			if _, ok := err.(*errors.Error); !ok {
				se = ErrInternalServer
			}
		}

		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.Header().Set("Access-Control-Expose-Headers", "TraceID, En ,Content-Disposition, Authorization")
		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}, "/")
}