30 lines
1.0 KiB
Go
30 lines
1.0 KiB
Go
package main
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import (
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"encoding/json"
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"errors"
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"io"
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"net/http"
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"git.k6n.net/mats/go-cart-actor/pkg/promotions"
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)
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// newPromotionEvaluateHandler serves POST /promotions/evaluate: it takes a
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// (possibly partial) evaluation context and returns the totals plus the
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// applied/pending promotion effects, without creating or mutating a real cart.
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// An empty body is treated as an empty context (evaluates against no items).
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func newPromotionEvaluateHandler(store *promotions.Store, svc *promotions.PromotionService) http.HandlerFunc {
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return func(w http.ResponseWriter, r *http.Request) {
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var req promotions.EvaluateRequest
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if err := json.NewDecoder(r.Body).Decode(&req); err != nil && !errors.Is(err, io.EOF) {
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http.Error(w, "invalid JSON body: "+err.Error(), http.StatusBadRequest)
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return
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}
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resp := svc.Evaluate(store.Snapshot(), req)
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w.Header().Set("Content-Type", "application/json")
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if err := json.NewEncoder(w).Encode(resp); err != nil {
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http.Error(w, err.Error(), http.StatusInternalServerError)
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}
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}
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}
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