package http

import (
	"bytes"
	"encoding/json"
	"gitea.drugeyes.vip/pharnexbase/tools/request"
	"github.com/go-kratos/kratos/v2/errors"
	"github.com/go-kratos/kratos/v2/transport/http"
	"github.com/go-kratos/kratos/v2/transport/http/binding"
	"github.com/tidwall/gjson"
	"io"
	"net/url"
	"strings"
)

var SignErr = errors.Forbidden("SignError", "签名错误")

func (t *Transport) RequestQueryDecoder() http.DecodeRequestFunc {
	return func(r *http.Request, v interface{}) error {
		// 将post和query参数合并
		params := make(map[string]string)
		for _, val := range strings.Split(r.URL.RawQuery, "&") {
			vals := strings.Split(val, "=")
			if len(vals) < 2 {
				continue
			}
			params[vals[0]], _ = url.PathUnescape(vals[1])
		}
		signature := request.NewSignature(t.apiKey, request.NewSHA1HashAlg())
		signStr := signature.GenSignature(params)
		if signStr != r.Header.Get("sm5") {
			return SignErr
		}
		if err := binding.BindQuery(r.URL.Query(), v); err != nil {
			return errors.BadRequest("CODEC", err.Error())
		}

		return nil
	}
}

// RequestDecoder 请求拦截
func (t *Transport) RequestDecoder() http.DecodeRequestFunc {
	return func(r *http.Request, v interface{}) error {
		// 从Request Header的Content-Type中提取出对应的解码器
		codec, ok := http.CodecForRequest(r, "Content-Type")
		// 如果找不到对应的解码器此时会报错
		if !ok {
			return errors.BadRequest("CODEC", r.Header.Get("Content-Type"))
		}
		data, err := io.ReadAll(r.Body)
		if err != nil {
			return errors.BadRequest("CODEC", err.Error())
		}

		// 将post和query参数合并
		params := make(map[string]string)
		gjson.ParseBytes(data).ForEach(func(key, value gjson.Result) bool {
			switch value.Type {
			case gjson.JSON:
				var buf bytes.Buffer
				json.Compact(&buf, []byte(value.String()))
				params[key.String()] = buf.String()
			default:
				params[key.String()] = value.String()
			}

			return true
		})
		for _, val := range strings.Split(r.URL.RawQuery, "&") {
			vals := strings.Split(val, "=")
			if len(vals) < 2 {
				continue
			}
			params[vals[0]], _ = url.PathUnescape(vals[1])
		}
		signature := request.NewSignature(t.apiKey, request.NewSHA1HashAlg())
		signStr := signature.GenSignature(params)
		if signStr != r.Header.Get("sm5") {
			return SignErr
		}

		if err = codec.Unmarshal(data, v); err != nil {
			return errors.BadRequest("CODEC", err.Error())
		}

		return nil
	}
}