Merged in chore/SW-3321-move-selectratecontext-to- (pull request #2729)

chore(SW-3321): Moved Select rate context to booking-flow package

* chore(SW-3321): Moved Select rate context to booking-flow package

* chore(SW-3321): Optimised code


Approved-by: Joakim Jäderberg

packages/booking-flow/lib/utils/SelectRate/index.test.ts

@@ -0,0 +1,73 @@
+import { describe, expect, it } from "vitest"
+
+import { AlertTypeEnum } from "@scandic-hotels/common/constants/alert"
+import { dt } from "@scandic-hotels/common/dt"
+
+import { filterOverlappingDates } from "./index"
+
+import type { specialAlertsSchema } from "@scandic-hotels/trpc/routers/hotels/schemas/hotel/specialAlerts"
+import type { z } from "zod"
+
+type Alert = z.infer<typeof specialAlertsSchema>[number]
+
+function makeAlert(start: string, end: string): Alert {
+  return {
+    id: "test-id",
+    name: "Test Alert",
+    heading: "Test Heading",
+    text: "Some text",
+    type: AlertTypeEnum.Alarm,
+    displayInBookingFlow: true,
+    startDate: start,
+    endDate: end,
+  }
+}
+
+describe("filterOverlappingDates", () => {
+  const alert = makeAlert("2025-09-01", "2025-09-10")
+
+  it("shows alert if booking starts inside alert", () => {
+    const result = filterOverlappingDates(
+      [alert],
+      dt("2025-09-05"),
+      dt("2025-09-12")
+    )
+    expect(result).toHaveLength(1)
+  })
+
+  it("shows alert if booking ends inside alert", () => {
+    const result = filterOverlappingDates(
+      [alert],
+      dt("2025-08-28"),
+      dt("2025-09-05")
+    )
+    expect(result).toHaveLength(1)
+  })
+
+  it("shows alert if booking fully contains alert", () => {
+    const result = filterOverlappingDates(
+      [alert],
+      dt("2025-08-28"),
+      dt("2025-09-15")
+    )
+    expect(result).toHaveLength(1)
+  })
+
+  it("shows alert if alert fully contains booking", () => {
+    const result = filterOverlappingDates(
+      [alert],
+      dt("2025-09-03"),
+      dt("2025-09-05")
+    )
+    expect(result).toHaveLength(1)
+  })
+
+  it("does not show alert if no overlap", () => {
+    const result = filterOverlappingDates(
+      [alert],
+      dt("2025-08-01"),
+      dt("2025-08-05")
+    )
+    expect(result).toHaveLength(0)
+  })
+})