package request

import (
	"git.sxidc.com/go-framework/baize/framework/core/domain"
	"git.sxidc.com/go-framework/baize/framework/core/tag/assign"
	"git.sxidc.com/go-tools/utils/reflectutils"
	"git.sxidc.com/service-supports/fserr"
	"reflect"
)

type Params interface{}

func AssignRequestParamsToDomainObject(params Params, domainObject domain.Object) error {
	return assign.DefaultUsage(params, domainObject)
}

func Field[T any](params Params, fieldName string) (T, error) {
	zero := reflectutils.Zero[T]()

	if params == nil {
		return zero, fserr.New("请求参数为nil")
	}

	fieldValue, err := getRequestParamsValue(params, fieldName)
	if err != nil {
		return zero, err
	}

	if !fieldValue.IsValid() {
		return zero, fserr.New("请求参数" + fieldValue.Type().String() + "的字段" + fieldName + "无法赋值")
	}

	retValue, ok := fieldValue.Interface().(T)
	if !ok {
		return zero, fserr.New("请求参数" + fieldValue.Type().String() + "的字段" + fieldName + "无法转换类型")
	}

	return retValue, nil
}

func ToConcrete[T Params](params Params) (T, error) {
	zero := reflectutils.Zero[T]()

	if params == nil {
		return zero, fserr.New("请求参数为nil")
	}

	concrete, ok := params.(T)
	if !ok {
		return zero, fserr.New("请求参数转化失败")
	}

	return concrete, nil
}

func getRequestParamsValue(params Params, fieldName string) (*reflect.Value, error) {
	if params == nil {
		return nil, fserr.New("请求参数为nil")
	}

	paramsValue := reflect.ValueOf(params)

	if !reflectutils.IsValueStructOrStructPointer(paramsValue) {
		return nil, fserr.New("请求参数必须是结构或结构指针")
	}

	fieldValue := reflectutils.PointerValueElem(paramsValue).FieldByName(fieldName)

	return &fieldValue, nil
}