39 lines
750 B
Go
39 lines
750 B
Go
package main
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import (
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"slices"
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"git.tornberg.me/go-cart-actor/pkg/actor"
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"git.tornberg.me/go-cart-actor/pkg/messages"
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)
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func AddVoucher(g *CartGrain, m *messages.AddVoucher) error {
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if m == nil {
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return &actor.MutationError{
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Message: "AddVoucher: nil payload",
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Code: 1001,
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StatusCode: 400,
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}
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}
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if slices.ContainsFunc(g.Vouchers, func(v *Voucher) bool {
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return v.Code == m.Code
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}) {
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return &actor.MutationError{
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Message: "voucher already applied",
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Code: 1002,
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StatusCode: 400,
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}
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}
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g.lastVoucherId++
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g.Vouchers = append(g.Vouchers, &Voucher{
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Id: g.lastVoucherId,
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Code: m.Code,
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Rules: m.VoucherRules,
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Value: *NewPriceFromIncVat(m.Value, 25.0),
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})
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g.UpdateTotals()
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return nil
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}
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