package gateway

import (
	"git.sxidc.com/go-framework/baize/framework/binding"
	"git.sxidc.com/go-framework/baize/framework/binding/request"
	"git.sxidc.com/go-framework/baize/framework/binding/response"
	"git.sxidc.com/go-framework/baize/framework/core/api"
	"git.sxidc.com/go-framework/baize/framework/core/domain"
	"git.sxidc.com/go-framework/baize/framework/core/infrastructure"
	"git.sxidc.com/go-framework/baize/framework/core/infrastructure/logger"
	"git.sxidc.com/go-tools/utils/http_client"
	"git.sxidc.com/service-supports/fserr"
	"io"
	"net/http"
	"strings"
	"time"
)

func (gw *Gateway) BodyMapping(binder *binding.Binder, bodyMapping *BodyMapping, middlewares ...api.Handler) {
	bodyMapping.bind(binder, gw.httpClient, gw.options.timeoutSec, middlewares...)
}

type BodyMapping struct {
	HttpMethod   string
	RelativePath string
	ToUrl        string

	BodyMappingFunc func(body []byte) ([]byte, error)
}

func (bodyMapping *BodyMapping) bind(binder *binding.Binder, httpClient *http_client.Client, timeoutSec int64, middlewares ...api.Handler) {
	binding.Bind[any](binder, &binding.BindItem[any]{
		Method: bodyMapping.HttpMethod,
		SimpleBindItem: &binding.SimpleBindItem[any]{
			Path:         bodyMapping.RelativePath,
			ResponseFunc: response.NoResponse,
			ServiceFunc: func(c *api.Context, params request.Params, objects []domain.Object, i *infrastructure.Infrastructure) (any, error) {
				body, err := io.ReadAll(c.Request.Body)
				if err != nil {
					logger.GetInstance().Error(err)
					c.AbortWithStatus(http.StatusBadGateway)
					return nil, err
				}

				defer func() {
					err := c.Request.Body.Close()
					if err != nil {
						logger.GetInstance().Error(err)
						c.AbortWithStatus(http.StatusBadGateway)
					}
				}()

				if bodyMapping.BodyMappingFunc != nil {
					newBody, err := bodyMapping.BodyMappingFunc(body)
					if err != nil {
						logger.GetInstance().Error(err)
						c.AbortWithStatus(http.StatusBadGateway)
						return nil, err
					}

					body = newBody
				}

				headers := make(map[string]string)
				for key, values := range c.Request.Header {
					headers[key] = strings.Join(values, ",")
				}

				var httpResponse *http_client.Response
				httpRequest := httpClient.
					NewRequest(http_client.WithNewRequestTimeout(time.Duration(timeoutSec) * time.Second))

				switch bodyMapping.HttpMethod {
				case http.MethodPost:
					resp, err := httpRequest.Post(bodyMapping.ToUrl, body, http_client.WithRequestHeaders(headers))
					if err != nil {
						logger.GetInstance().Error(err)
						c.AbortWithStatus(http.StatusBadGateway)
						return nil, err
					}

					httpResponse = resp
				case http.MethodPut:
					resp, err := httpRequest.Put(bodyMapping.ToUrl, body, http_client.WithRequestHeaders(headers))
					if err != nil {
						logger.GetInstance().Error(err)
						c.AbortWithStatus(http.StatusBadGateway)
						return nil, err
					}

					httpResponse = resp
				default:
					err := fserr.New("不支持Body传递参数")
					logger.GetInstance().Error(err)
					c.AbortWithStatus(http.StatusBadGateway)
					return nil, err
				}

				c.Status(http.StatusOK)

				_, err = c.Writer.Write(httpResponse.Body())
				if err != nil {
					logger.GetInstance().Error(err)
					c.AbortWithStatus(http.StatusBadGateway)
					return nil, err
				}

				c.Writer.Flush()

				return nil, nil
			},
		},
	}, middlewares...)
}