model

type Cat struct {
	Name string `json:"name"`
}

type History interface {
	IsHistory()
}

type Identifiable interface {
	IsIdentifiable()
	GetID() string
}

type Info interface {
	IsInfo()
	GetQuantity() int
}

type Product struct {
	Upc string `json:"upc"`
}

type Purchase struct {
	Product  *Product `json:"product"`
	Wallet   Wallet   `json:"wallet"`
	Quantity int      `json:"quantity"`
}

type Sale struct {
	Product  *Product `json:"product"`
	Rating   int      `json:"rating"`
	Location string   `json:"location"`
}

type Store interface {
	IsStore()
	GetLocation() string
}

type User struct {
	ID       string    `json:"id"`
	Username string    `json:"username"`
	History  []History `json:"history"`
	RealName string    `json:"realName"`
}

type Wallet interface {
	IsWallet()
	GetCurrency() string
	GetAmount() float64
}

type WalletType1 struct {
	Currency      string  `json:"currency"`
	Amount        float64 `json:"amount"`
	SpecialField1 string  `json:"specialField1"`
}

type WalletType2 struct {
	Currency      string  `json:"currency"`
	Amount        float64 `json:"amount"`
	SpecialField2 string  `json:"specialField2"`
}