Feat/BOOK-424 campaign banner

Approved-by: Bianca Widstam

apps/scandic-web/components/CampaignBanner/utils.ts

@@ -0,0 +1,45 @@
+import { AlertTypeEnum } from "@scandic-hotels/common/constants/alert"
+import {
+  removeMultipleSlashes,
+  removeTrailingSlash,
+} from "@scandic-hotels/common/utils/url"
+
+import { CAMPAIGN_BANNER_HIDE_CONDITIONS } from "@/components/CampaignBanner/constants"
+
+import type { Lang } from "@scandic-hotels/common/constants/language"
+
+export function shouldShowCampaignBanner(
+  pathname: string,
+  lang: Lang,
+  closedPaths: Set<string>,
+  sitewideAlertType: AlertTypeEnum | null
+): boolean {
+  const cleanPathname = removeTrailingSlash(removeMultipleSlashes(pathname))
+
+  // Check if the banner should not be visible on the current path based on hide conditions.
+  const isOnHideRoute = CAMPAIGN_BANNER_HIDE_CONDITIONS.routes[lang].some(
+    (route) => {
+      const fullRoute = removeTrailingSlash(
+        removeMultipleSlashes(`/${lang}${route}`)
+      )
+      return cleanPathname === fullRoute
+    }
+  )
+
+  if (isOnHideRoute) {
+    return false
+  }
+
+  // The campaign banner should not be visible if there is an alarming sitewide alert
+  if (sitewideAlertType === AlertTypeEnum.Alarm) {
+    return false
+  }
+
+  // Check if the user closed the banner and should therefore not be visible on the current path.
+  // This is saved in a local state and is reset on page reload.
+  if (closedPaths.has(pathname)) {
+    return false
+  }
+
+  return true
+}