package entity

import "reflect"

type PkStrategy int

const (
	_ PkStrategy = iota
	Auto
	Manual
)

type (
	Index struct {
		Name    string
		Columns []string
		Unique  bool
	}
	InternalTools struct {
		ExtractField  FieldExtractor
		SetFieldValue FieldSetter
		NewInstance   Instantiator
		Copy          Copier
		CompareField  FieldComparator
	}
	FieldExtractor  func(e any, name string) (any, error)
	FieldSetter     func(e any, name string, value any) error
	Instantiator    func() any
	Copier          func(src any, dst any)
	FieldComparator func(e1, e2 any, name string) bool
)

type D3Entity interface {
	D3Token() MetaToken
}

type MetaToken struct {
	Tools     InternalTools
	Tpl       any
	TableName string
	Indexes   []Index
}

type MetaInfo struct {
	Tpl        any
	EntityName Name
	TableName  string
	Indexes    []Index

	Relations map[string]Relation
}

type FieldInfo struct {
	Name           string
	DBAlias        string
	FullDBAlias    string
	AssociatedType reflect.Type
}