Add product features, Heleket crypto payments and order status icons.

internal/compare/compare.go

@@ -0,0 +1,66 @@
+package compare
+
+import (
+	"strconv"
+	"strings"
+)
+
+const maxItems = 2
+
+func Parse(raw string) []int {
+	if raw == "" {
+		return nil
+	}
+	var ids []int
+	for _, part := range strings.Split(raw, ",") {
+		id, err := strconv.Atoi(strings.TrimSpace(part))
+		if err != nil || id <= 0 {
+			continue
+		}
+		ids = appendUnique(ids, id)
+	}
+	return ids
+}
+
+func Format(ids []int) string {
+	if len(ids) == 0 {
+		return ""
+	}
+	parts := make([]string, len(ids))
+	for i, id := range ids {
+		parts[i] = strconv.Itoa(id)
+	}
+	return strings.Join(parts, ",")
+}
+
+func Add(raw string, id int) string {
+	if id <= 0 {
+		return raw
+	}
+	ids := Parse(raw)
+	ids = appendUnique(ids, id)
+	if len(ids) > maxItems {
+		ids = ids[len(ids)-maxItems:]
+	}
+	return Format(ids)
+}
+
+func Remove(raw string, id int) string {
+	ids := Parse(raw)
+	var next []int
+	for _, v := range ids {
+		if v != id {
+			next = append(next, v)
+		}
+	}
+	return Format(next)
+}
+
+func appendUnique(ids []int, id int) []int {
+	for _, v := range ids {
+		if v == id {
+			return ids
+		}
+	}
+	return append(ids, id)
+}