52 lines
1.5 KiB
Go
52 lines
1.5 KiB
Go
package inventory
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import (
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"context"
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"fmt"
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"net/http"
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)
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// StockReader abstracts the inventory getter for badge rendering.
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type StockReader interface {
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GetInventory(ctx context.Context, sku SKU, locationID LocationID) (int64, error)
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}
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// BadgeHandler returns an http.HandlerFunc that renders an HTML stock badge fragment.
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func BadgeHandler(reader StockReader) http.HandlerFunc {
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return func(w http.ResponseWriter, r *http.Request) {
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sku := r.URL.Query().Get("sku")
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if sku == "" {
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http.Error(w, "missing sku parameter", http.StatusBadRequest)
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return
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}
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locationID := LocationID(r.URL.Query().Get("location_id"))
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if locationID == "" {
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locationID = "default"
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}
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w.Header().Set("Content-Type", "text/html; charset=utf-8")
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w.Header().Set("Cache-Control", "private, max-age=5")
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qty, err := reader.GetInventory(r.Context(), SKU(sku), locationID)
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if err != nil {
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w.WriteHeader(http.StatusOK)
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w.Write([]byte(`<span class="stock-badge stock-unknown" data-sku="` + sku + `">Availability unavailable</span>`))
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return
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}
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var htmlSnippet string
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switch {
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case qty > 10:
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htmlSnippet = fmt.Sprintf(`<span class="stock-badge stock-in-stock" data-sku="%s">✓ In stock</span>`, sku)
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case qty > 0:
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htmlSnippet = fmt.Sprintf(`<span class="stock-badge stock-low-stock" data-sku="%s">⚡ Only %d left!</span>`, sku, qty)
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default:
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htmlSnippet = fmt.Sprintf(`<span class="stock-badge stock-out-of-stock" data-sku="%s">✕ Out of stock</span>`, sku)
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}
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w.WriteHeader(http.StatusOK)
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w.Write([]byte(htmlSnippet))
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}
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}
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