83 lines
2.1 KiB
Go
83 lines
2.1 KiB
Go
package main
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import (
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"fmt"
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messages "git.tornberg.me/go-cart-actor/pkg/messages"
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)
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// mutation_add_item.go
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//
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// Registers the AddItem cart mutation in the generic mutation registry.
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// This replaces the legacy switch-based logic previously found in CartGrain.Apply.
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//
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// Behavior:
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// * Validates quantity > 0
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// * If an item with same SKU exists -> increases quantity
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// * Else creates a new CartItem with computed tax amounts
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// * Totals recalculated automatically via WithTotals()
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//
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// NOTE: Any future field additions in messages.AddItem that affect pricing / tax
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// must keep this handler in sync.
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func init() {
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RegisterMutation[messages.AddItem](
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"AddItem",
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func(g *CartGrain, m *messages.AddItem) error {
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if m == nil {
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return fmt.Errorf("AddItem: nil payload")
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}
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if m.Quantity < 1 {
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return fmt.Errorf("AddItem: invalid quantity %d", m.Quantity)
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}
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// Fast path: merge with existing item having same SKU
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if existing, found := g.FindItemWithSku(m.Sku); found {
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existing.Quantity += int(m.Quantity)
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return nil
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}
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g.mu.Lock()
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defer g.mu.Unlock()
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g.lastItemId++
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taxRate := 2500
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if m.Tax > 0 {
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taxRate = int(m.Tax)
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}
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taxAmountPerUnit := GetTaxAmount(m.Price, taxRate)
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g.Items = append(g.Items, &CartItem{
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Id: g.lastItemId,
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ItemId: int(m.ItemId),
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Quantity: int(m.Quantity),
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Sku: m.Sku,
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Name: m.Name,
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Price: m.Price,
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TotalPrice: m.Price * int64(m.Quantity),
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TotalTax: int64(taxAmountPerUnit * int64(m.Quantity)),
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Image: m.Image,
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Stock: StockStatus(m.Stock),
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Disclaimer: m.Disclaimer,
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Brand: m.Brand,
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Category: m.Category,
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Category2: m.Category2,
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Category3: m.Category3,
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Category4: m.Category4,
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Category5: m.Category5,
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OrgPrice: m.OrgPrice,
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ArticleType: m.ArticleType,
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Outlet: m.Outlet,
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SellerId: m.SellerId,
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SellerName: m.SellerName,
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Tax: int(taxAmountPerUnit),
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TaxRate: taxRate,
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StoreId: m.StoreId,
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})
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return nil
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},
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WithTotals(), // Recalculate totals after successful mutation
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)
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}
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