54 lines
1.5 KiB
Go
54 lines
1.5 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_remove_delivery.go
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//
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// Registers the RemoveDelivery mutation.
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//
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// Behavior:
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// - Removes the delivery entry whose Id == payload.Id.
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// - If not found, returns an error.
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// - Cart totals are recalculated (WithTotals) after removal.
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// - Items previously associated with that delivery simply become "without delivery";
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// subsequent delivery mutations can reassign them.
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//
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// Differences vs legacy:
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// - Legacy logic decremented TotalPrice explicitly before recalculating.
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// Here we rely solely on UpdateTotals() to recompute from remaining
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// deliveries and items (simpler / single source of truth).
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//
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// Future considerations:
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// - If delivery pricing logic changes (e.g., dynamic taxes per delivery),
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// UpdateTotals() may need enhancement to incorporate delivery tax properly.
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func init() {
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RegisterMutation[messages.RemoveDelivery](
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"RemoveDelivery",
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func(g *CartGrain, m *messages.RemoveDelivery) error {
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if m == nil {
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return fmt.Errorf("RemoveDelivery: nil payload")
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}
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targetID := int(m.Id)
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index := -1
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for i, d := range g.Deliveries {
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if d.Id == targetID {
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index = i
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break
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}
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}
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if index == -1 {
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return fmt.Errorf("RemoveDelivery: delivery id %d not found", m.Id)
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}
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// Remove delivery (order not preserved beyond necessity)
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g.Deliveries = append(g.Deliveries[:index], g.Deliveries[index+1:]...)
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return nil
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},
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WithTotals(),
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)
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}
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