package binding

import (
	"git.sxidc.com/go-framework/baize/framework/core/api"
	"git.sxidc.com/go-framework/baize/framework/core/api/request"
	"git.sxidc.com/go-framework/baize/framework/core/domain"
	"git.sxidc.com/go-tools/utils/reflectutils"
	"git.sxidc.com/go-tools/utils/strutils"
	"github.com/pkg/errors"
	"net/http"
	"reflect"
	"strings"
)

// Bind 通用绑定
// 类型参数:
// - O: 响应数据类型，对应response.SendResponseFunc的data的类型
// 参数:
// - binder: 用来执行绑定的binder
// - item: 执行绑定的参数
// - middlewares: 该绑定的中间件
func Bind[O any](binder *Binder, item *BindItem[O], middlewares ...Middleware) {
	item.bind(binder, middlewares...)
}

// BindItem 通用BindItem
type BindItem[O any] struct {
	Method string
	*SimpleBindItem[O]
}

func (item *BindItem[O]) bind(binder *Binder, middlewares ...Middleware) {
	if strutils.IsStringEmpty(item.Path) {
		panic("需要指定路径")
	}

	if strutils.IsStringEmpty(item.Method) {
		panic("需要指定方法")
	}

	if item.SendResponseFunc == nil {
		panic("需要指定响应函数")
	}

	if item.ServiceFunc == nil {
		panic("需要指定应用服务函数")
	}

	var outputZero O
	outputZeroValue := reflect.ValueOf(outputZero)
	if outputZeroValue.IsValid() && outputZeroValue.Kind() == reflect.Pointer {
		panic("bind的输出类型不能使用指针类型")
	}

	if outputZeroValue.IsValid() && strings.Contains(outputZeroValue.String(), "response.InfosData") {
		infosField := outputZeroValue.FieldByName("Infos")
		if infosField.IsValid() && infosField.Type().Elem().Kind() == reflect.Pointer {
			panic("bind的输出类型不能使用指针类型")
		}
	}

	apiMiddlewares := make([]api.Handler, len(middlewares))
	for i, middleware := range middlewares {
		innerMiddleware := middleware
		apiMiddlewares[i] = func(c *api.Context) {
			innerMiddleware(c, binder.i)
		}
	}

	handlers := append(apiMiddlewares, func(c *api.Context) {
		var params request.Params

		// 有请求数据
		if item.RequestParams != nil {
			requestParamsType := reflect.TypeOf(item.RequestParams)
			if !reflectutils.IsTypeStructOrStructPointer(requestParamsType) {
				item.SendResponseFunc(c, http.StatusOK, outputZero, errors.New("请求参数不是结构或结构指针"))
				return
			}

			if requestParamsType.Kind() == reflect.Pointer {
				params = reflect.New(requestParamsType.Elem()).Interface().(request.Params)
			} else {
				params = reflect.New(requestParamsType).Interface().(request.Params)
			}

			// 将请求数据解析到请求参数中
			if item.BindRequestParamsFunc != nil {
				err := item.BindRequestParamsFunc(c, params)
				if err != nil {
					item.SendResponseFunc(c, http.StatusBadRequest, outputZero, err)
					return
				}
			} else {
				switch item.Method {
				case http.MethodPost:
					fallthrough
				case http.MethodPut:
					err := request.BindJsonBody(c, params)
					if err != nil {
						item.SendResponseFunc(c, http.StatusBadRequest, outputZero, err)
						return
					}
				case http.MethodDelete:
					fallthrough
				case http.MethodGet:
					err := request.BindQueryParams(c, params)
					if err != nil {
						item.SendResponseFunc(c, http.StatusBadRequest, outputZero, err)
						return
					}
				}
			}
		}

		// 进行领域对象转化
		var domainObjects []domain.Object
		if item.FormDomainObjectsFunc != nil {
			innerDomainObjects, err := item.FormDomainObjectsFunc(c, params)
			if err != nil {
				item.SendResponseFunc(c, http.StatusOK, outputZero, err)
				return
			}

			domainObjects = innerDomainObjects
		} else {
			if item.Objects != nil && len(item.Objects) != 0 {
				for _, object := range item.Objects {
					if object == nil {
						continue
					}

					objectType := reflect.TypeOf(object)
					if !reflectutils.IsTypeStructOrStructPointer(objectType) {
						item.SendResponseFunc(c, http.StatusOK, outputZero, errors.New("领域对象不是结构或结构指针"))
						return
					}

					obj := reflect.New(reflectutils.PointerTypeElem(objectType)).Interface().(domain.Object)

					if params != nil {
						err := request.AssignRequestParamsToDomainObject(params, obj)
						if err != nil {
							item.SendResponseFunc(c, http.StatusOK, outputZero, err)
							return
						}
					}

					domainObjects = append(domainObjects, obj)
				}
			}
		}

		// 执行业务函数
		outputModel, err := item.ServiceFunc(c, params, domainObjects, binder.i)
		item.SendResponseFunc(c, http.StatusOK, outputModel, err)
		return
	})

	// 所有的函数加入到执行链中
	binder.router.AddRoute(item.Method, item.Path, handlers...)
}