package domain

import (
	"git.sxidc.com/go-tools/utils/reflectutils"
	"git.sxidc.com/go-tools/utils/strutils"
	"git.sxidc.com/go-tools/utils/template"
	"git.sxidc.com/service-supports/fserr"
	"github.com/iancoleman/strcase"
	"reflect"
)

type Object interface {
	DBSchema() string
	DomainCNName() string
	DomainCamelName() string
}

func HasField(object Object, fieldName string) bool {
	return hasField(object, fieldName)
}

func SetField[T any](object Object, fieldName string, value T) error {
	if object == nil {
		return fserr.New("领域对象为nil")
	}

	fieldValue, err := getFieldValue(object, fieldName)
	if err != nil {
		return err
	}

	if !fieldValue.IsValid() || !fieldValue.CanSet() {
		return fserr.New("领域对象" + fieldValue.Type().String() + "的字段" + fieldName + "无法赋值")
	}

	fieldValue.Set(reflect.ValueOf(value))

	return nil
}

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

	if object == nil {
		return zero, fserr.New("领域对象为nil")
	}

	fieldValue, err := getFieldValue(object, fieldName)
	if err != nil {
		return zero, err
	}

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

	retValue, ok := fieldValue.Interface().(T)
	if !ok {
		return zero, err
	}

	return retValue, nil
}

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

	if object == nil {
		return zero, fserr.New("领域对象为nil")
	}

	concrete, ok := object.(T)
	if !ok {
		return zero, fserr.New("领域对象转化失败")
	}

	return concrete, nil
}

func hasField(object Object, fieldName string) bool {
	if object == nil {
		return false
	}

	objectValue := reflect.ValueOf(object)
	if !reflectutils.IsValueStructOrStructPointer(objectValue) {
		return false
	}

	fieldValue := reflectutils.PointerValueElem(objectValue).FieldByName(fieldName)
	if !fieldValue.IsValid() {
		return false
	}

	return true
}

func getFieldValue(object Object, fieldName string) (*reflect.Value, error) {
	if object == nil {
		return nil, fserr.New("领域对象为nil")
	}

	objectValue := reflect.ValueOf(object)

	if !reflectutils.IsValueStructOrStructPointer(objectValue) {
		return nil, fserr.New("领域对象必须是结构或结构指针")
	}

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

	return &fieldValue, nil
}

func TableName(schema string, object Object) string {
	if strutils.IsStringNotEmpty(object.DBSchema()) {
		schema = object.DBSchema()
	}

	if strutils.IsStringEmpty(schema) {
		return template.Plural(strcase.ToSnake(template.Id(object.DomainCamelName())))
	} else {
		return schema + "." + template.Plural(strcase.ToSnake(template.Id(object.DomainCamelName())))
	}
}

func RelationTableName(schema string, left Object, right Object) string {
	if strutils.IsStringEmpty(schema) {
		return strcase.ToSnake(template.Id(left.DomainCamelName())) + "_and_" + strcase.ToSnake(template.Id(right.DomainCamelName()))
	} else {
		return schema + "." + strcase.ToSnake(template.Id(left.DomainCamelName())) + "_and_" + strcase.ToSnake(template.Id(right.DomainCamelName()))
	}
}

func RelativeDomainPath(object Object) string {
	return "/" + strcase.ToLowerCamel(template.Id(object.DomainCamelName()))
}

func SnakeDomainName(object Object) string {
	return strcase.ToSnake(template.Id(object.DomainCamelName()))
}