303 lines
8.0 KiB
Go
303 lines
8.0 KiB
Go
package main
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import (
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"encoding/json"
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"fmt"
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"sync"
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"time"
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messages "git.tornberg.me/go-cart-actor/proto"
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)
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type CartId [16]byte
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// String returns the cart id as a trimmed UTF-8 string (trailing zero bytes removed).
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func (id CartId) String() string {
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n := 0
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for n < len(id) && id[n] != 0 {
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n++
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}
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return string(id[:n])
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}
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// ToCartId converts an arbitrary string to a fixed-size CartId (truncating or padding with zeros).
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func ToCartId(s string) CartId {
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var id CartId
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copy(id[:], []byte(s))
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return id
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}
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func (id CartId) MarshalJSON() ([]byte, error) {
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return json.Marshal(id.String())
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}
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func (id *CartId) UnmarshalJSON(data []byte) error {
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var str string
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err := json.Unmarshal(data, &str)
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if err != nil {
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return err
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}
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copy(id[:], []byte(str))
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return nil
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}
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type StockStatus int
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const (
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OutOfStock StockStatus = 0
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LowStock StockStatus = 1
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InStock StockStatus = 2
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)
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type CartItem struct {
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Id int `json:"id"`
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ItemId int `json:"itemId,omitempty"`
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ParentId int `json:"parentId,omitempty"`
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Sku string `json:"sku"`
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Name string `json:"name"`
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Price int64 `json:"price"`
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TotalPrice int64 `json:"totalPrice"`
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TotalTax int64 `json:"totalTax"`
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OrgPrice int64 `json:"orgPrice"`
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Stock StockStatus `json:"stock"`
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Quantity int `json:"qty"`
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Tax int `json:"tax"`
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TaxRate int `json:"taxRate"`
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Brand string `json:"brand,omitempty"`
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Category string `json:"category,omitempty"`
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Category2 string `json:"category2,omitempty"`
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Category3 string `json:"category3,omitempty"`
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Category4 string `json:"category4,omitempty"`
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Category5 string `json:"category5,omitempty"`
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Disclaimer string `json:"disclaimer,omitempty"`
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SellerId string `json:"sellerId,omitempty"`
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SellerName string `json:"sellerName,omitempty"`
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ArticleType string `json:"type,omitempty"`
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Image string `json:"image,omitempty"`
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Outlet *string `json:"outlet,omitempty"`
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StoreId *string `json:"storeId,omitempty"`
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}
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type CartDelivery struct {
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Id int `json:"id"`
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Provider string `json:"provider"`
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Price int64 `json:"price"`
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Items []int `json:"items"`
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PickupPoint *messages.PickupPoint `json:"pickupPoint,omitempty"`
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}
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type CartGrain struct {
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mu sync.RWMutex
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lastItemId int
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lastDeliveryId int
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lastChange int64 // unix seconds of last successful mutation (replay sets from event ts)
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Id CartId `json:"id"`
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Items []*CartItem `json:"items"`
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TotalPrice int64 `json:"totalPrice"`
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TotalTax int64 `json:"totalTax"`
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TotalDiscount int64 `json:"totalDiscount"`
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Deliveries []*CartDelivery `json:"deliveries,omitempty"`
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Processing bool `json:"processing"`
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PaymentInProgress bool `json:"paymentInProgress"`
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OrderReference string `json:"orderReference,omitempty"`
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PaymentStatus string `json:"paymentStatus,omitempty"`
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}
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type Grain interface {
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GetId() CartId
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Apply(content interface{}, isReplay bool) (*CartGrain, error)
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GetCurrentState() (*CartGrain, error)
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}
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func (c *CartGrain) GetId() CartId {
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return c.Id
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}
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func (c *CartGrain) GetLastChange() int64 {
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return c.lastChange
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}
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func (c *CartGrain) GetCurrentState() (*CartGrain, error) {
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return c, nil
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}
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func getInt(data float64, ok bool) (int, error) {
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if !ok {
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return 0, fmt.Errorf("invalid type")
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}
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return int(data), nil
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}
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func getItemData(sku string, qty int, country string) (*messages.AddItem, error) {
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item, err := FetchItem(sku, country)
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if err != nil {
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return nil, err
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}
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orgPrice, _ := getInt(item.GetNumberFieldValue(5)) // getInt(item.Fields[5])
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price, priceErr := getInt(item.GetNumberFieldValue(4)) //Fields[4]
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if priceErr != nil {
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return nil, fmt.Errorf("invalid price")
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}
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stock := InStock
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/*item.t
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if item.StockLevel == "0" || item.StockLevel == "" {
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stock = OutOfStock
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} else if item.StockLevel == "5+" {
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stock = LowStock
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}*/
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articleType, _ := item.GetStringFieldValue(1) //.Fields[1].(string)
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outletGrade, ok := item.GetStringFieldValue(20) //.Fields[20].(string)
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var outlet *string
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if ok {
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outlet = &outletGrade
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}
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sellerId, _ := item.GetStringFieldValue(24) // .Fields[24].(string)
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sellerName, _ := item.GetStringFieldValue(9) // .Fields[9].(string)
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brand, _ := item.GetStringFieldValue(2) //.Fields[2].(string)
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category, _ := item.GetStringFieldValue(10) //.Fields[10].(string)
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category2, _ := item.GetStringFieldValue(11) //.Fields[11].(string)
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category3, _ := item.GetStringFieldValue(12) //.Fields[12].(string)
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category4, _ := item.GetStringFieldValue(13) //Fields[13].(string)
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category5, _ := item.GetStringFieldValue(14) //.Fields[14].(string)
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return &messages.AddItem{
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ItemId: int64(item.Id),
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Quantity: int32(qty),
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Price: int64(price),
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OrgPrice: int64(orgPrice),
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Sku: sku,
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Name: item.Title,
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Image: item.Img,
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Stock: int32(stock),
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Brand: brand,
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Category: category,
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Category2: category2,
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Category3: category3,
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Category4: category4,
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Category5: category5,
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Tax: 2500,
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SellerId: sellerId,
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SellerName: sellerName,
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ArticleType: articleType,
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Disclaimer: item.Disclaimer,
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Country: country,
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Outlet: outlet,
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}, nil
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}
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func (c *CartGrain) AddItem(sku string, qty int, country string, storeId *string) (*CartGrain, error) {
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cartItem, err := getItemData(sku, qty, country)
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if err != nil {
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return nil, err
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}
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cartItem.StoreId = storeId
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return c.Apply(cartItem, false)
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}
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/*
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Legacy storage (event sourcing) removed in oneof refactor.
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Kept stub (commented) for potential future reintroduction using proto envelopes.
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func (c *CartGrain) GetStorageMessage(since int64) []interface{} {
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return nil
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}
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*/
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func (c *CartGrain) GetState() ([]byte, error) {
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return json.Marshal(c)
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}
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func (c *CartGrain) ItemsWithDelivery() []int {
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ret := make([]int, 0, len(c.Items))
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for _, item := range c.Items {
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for _, delivery := range c.Deliveries {
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for _, id := range delivery.Items {
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if item.Id == id {
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ret = append(ret, id)
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}
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}
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}
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}
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return ret
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}
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func (c *CartGrain) ItemsWithoutDelivery() []int {
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ret := make([]int, 0, len(c.Items))
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hasDelivery := c.ItemsWithDelivery()
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for _, item := range c.Items {
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found := false
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for _, id := range hasDelivery {
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if item.Id == id {
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found = true
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break
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}
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}
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if !found {
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ret = append(ret, item.Id)
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}
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}
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return ret
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}
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func (c *CartGrain) FindItemWithSku(sku string) (*CartItem, bool) {
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c.mu.RLock()
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defer c.mu.RUnlock()
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for _, item := range c.Items {
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if item.Sku == sku {
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return item, true
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}
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}
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return nil, false
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}
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func GetTaxAmount(total int64, tax int) int64 {
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taxD := 10000 / float64(tax)
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return int64(float64(total) / float64((1 + taxD)))
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}
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func (c *CartGrain) Apply(content interface{}, isReplay bool) (*CartGrain, error) {
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grainMutations.Inc()
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updated, err := ApplyRegistered(c, content)
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if err != nil {
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if err == ErrMutationNotRegistered {
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return nil, fmt.Errorf("unsupported mutation type %T (not registered)", content)
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}
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return nil, err
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}
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// Sliding TTL: update lastChange only for non-replay successful mutations.
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if updated != nil && !isReplay {
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c.lastChange = time.Now().Unix()
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_ = AppendCartEvent(c.Id, content)
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}
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return updated, nil
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}
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func (c *CartGrain) UpdateTotals() {
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c.TotalPrice = 0
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c.TotalTax = 0
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c.TotalDiscount = 0
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for _, item := range c.Items {
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rowTotal := item.Price * int64(item.Quantity)
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rowTax := int64(item.Tax) * int64(item.Quantity)
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item.TotalPrice = rowTotal
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item.TotalTax = rowTax
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c.TotalPrice += rowTotal
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c.TotalTax += rowTax
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itemDiff := max(0, item.OrgPrice-item.Price)
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c.TotalDiscount += itemDiff * int64(item.Quantity)
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}
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for _, delivery := range c.Deliveries {
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c.TotalPrice += delivery.Price
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c.TotalTax += GetTaxAmount(delivery.Price, 2500)
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}
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}
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