52 lines
1.8 KiB
Go
52 lines
1.8 KiB
Go
package main
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// mutation_add_request.go
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//
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// Registers the AddRequest mutation. This mutation is a higher-level intent
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// (add by SKU + quantity) which may translate into either:
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// - Increasing quantity of an existing line (same SKU), OR
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// - Creating a new item by performing a product lookup (via getItemData inside CartGrain.AddItem)
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//
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// Behavior:
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// - Validates non-empty SKU and quantity > 0
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// - If an item with the SKU already exists: increments its quantity
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// - Else delegates to CartGrain.AddItem (which itself produces an AddItem mutation)
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// - Totals recalculated automatically (WithTotals)
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//
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// NOTE:
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// - This handler purposely avoids duplicating the detailed AddItem logic;
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// it reuses CartGrain.AddItem which then flows through the AddItem mutation
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// registry handler.
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// - Double total recalculation can occur (AddItem has WithTotals too), but
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// is acceptable for clarity. Optimize later if needed.
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//
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// Potential future improvements:
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// - Stock validation before increasing quantity
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// - Reservation logic or concurrency guards around stock updates
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// - Coupon / pricing rules applied conditionally during add-by-sku
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// func HandleAddRequest(g *CartGrain, m *messages.AddRequest) error {
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// if m == nil {
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// return fmt.Errorf("AddRequest: nil payload")
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// }
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// if m.Sku == "" {
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// return fmt.Errorf("AddRequest: sku is empty")
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// }
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// if m.Quantity < 1 {
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// return fmt.Errorf("AddRequest: invalid quantity %d", m.Quantity)
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// }
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// // Existing line: accumulate quantity only.
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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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// data, err := GetItemAddMessage(m.Sku, int(m.Quantity), m.Country, m.StoreId)
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// if err != nil {
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// return err
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// }
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// return AddItem(g, data)
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// return err
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// }
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