calculator

type Coupon interface {
	ValidForType(string) bool
	ValidForPrice(string, uint64) bool
	PercentageDiscount() uint64
	FixedDiscount(string) uint64
}

type FixedMemberDiscount struct {
	Amount   string `json:"amount"`
	Currency string `json:"currency"`
}

type Item interface {
	PriceInLowestUnit() uint64
	ProductType() string
	FixedVAT() uint64
	TaxableItems() []Item
	GetQuantity() uint64
}

type ItemPrice struct {
	Quantity uint64

	Subtotal uint64
	Discount uint64
	Taxes    uint64
	Total    uint64
}

type MemberDiscount struct {
	Claims       map[string]string      `json:"claims"`
	Percentage   uint64                 `json:"percentage"`
	FixedAmount  []*FixedMemberDiscount `json:"fixed"`
	ProductTypes []string               `json:"product_types"`
}

type Price struct {
	Items []ItemPrice

	Subtotal uint64
	Discount uint64
	Taxes    uint64
	Total    uint64
}

type Settings struct {
	PricesIncludeTaxes bool              `json:"prices_include_taxes"`
	Taxes              []*Tax            `json:"taxes"`
	MemberDiscounts    []*MemberDiscount `json:"member_discounts"`
}

type Tax struct {
	Percentage   uint64   `json:"percentage"`
	ProductTypes []string `json:"product_types"`
	Countries    []string `json:"countries"`
}