Use expected checkout for booking detail expected pay

src/main/kotlin/com/android/trisolarisserver/controller/BookingFlow.kt

@@ -250,7 +250,7 @@ class BookingFlow(
         }
 
         val totalNightlyRate = roomsToShow.sumOf { it.nightlyRate ?: 0L }
-        val expectedPay = computeExpectedPay(stays, booking.property.timezone)
+        val expectedPay = computeExpectedPayTotal(stays, booking.expectedCheckoutAt, booking.property.timezone)
         val amountCollected = paymentRepo.sumAmountByBookingId(bookingId)
         val pending = expectedPay - amountCollected
 
@@ -731,6 +731,26 @@ class BookingFlow(
         return total
     }
 
+    private fun computeExpectedPayTotal(
+        stays: List<RoomStay>,
+        expectedCheckoutAt: OffsetDateTime?,
+        timezone: String?
+    ): Long {
+        if (stays.isEmpty()) return 0
+        val now = nowForProperty(timezone)
+        var total = 0L
+        stays.forEach { stay ->
+            val rate = stay.nightlyRate ?: 0L
+            if (rate == 0L) return@forEach
+            val start = stay.fromAt.toLocalDate()
+            val endAt = stay.toAt ?: expectedCheckoutAt ?: now
+            val end = endAt.toLocalDate()
+            val nights = daysBetweenInclusive(start, end)
+            total += rate * nights
+        }
+        return total
+    }
+
     private fun daysBetweenInclusive(start: java.time.LocalDate, end: java.time.LocalDate): Long {
         val diff = end.toEpochDay() - start.toEpochDay()
         return if (diff <= 0) 1L else diff