feat: add validation check for break outside availability

packages/flutter_availability/lib/src/service/errors.dart

@@ -13,6 +13,11 @@ enum AvailabilityError {
     "and end time",
   ),
 
+  /// Error identifier for when a break is outside the availability time
+  breakOutsideAvailabilityTime(
+    "The break is outside the availability time",
+  ),
+
   /// Error identifier for when the end of the day is before the start
   endBeforeStart("The end of the day is before the start"),
 

packages/flutter_availability/lib/src/ui/screens/availability_modification.dart

@@ -99,6 +99,8 @@ class _AvailabilitiesModificationScreenState
         error = AvailabilityError.breakEndBeforeStart;
       } on BreakSubmittedDurationTooLongException {
         error = AvailabilityError.breakSubmittedDurationTooLong;
+      } on BreakOutsideAvailabilityTimeException {
+        error = AvailabilityError.breakOutsideAvailabilityTime;
       }
 
       if (error != null && context.mounted) {

packages/flutter_availability_data_interface/lib/src/models/availability.dart

@@ -8,6 +8,9 @@ class BreakEndBeforeStartException implements Exception {}
 /// between the start and end time
 class BreakSubmittedDurationTooLongException implements Exception {}
 
+/// Exception thrown when a break is outside the availability time
+class BreakOutsideAvailabilityTimeException implements Exception {}
+
 /// Exception thrown when the end is before the start
 class AvailabilityEndBeforeStartException implements Exception {}
 
@@ -100,6 +103,12 @@ class AvailabilityModel {
 
     for (var breakData in breaks) {
       breakData.validate();
+      var breakStart = breakData.startTime.time;
+      var breakEnd = breakData.endTime.time;
+      if (breakStart.isBefore(startDate.time) ||
+          breakEnd.isAfter(endDate.time)) {
+        throw BreakOutsideAvailabilityTimeException();
+      }
     }
   }
 }
@@ -201,7 +210,7 @@ class AvailabilityBreakModel {
 
   /// Verify the validity of this break
   void validate() {
-    if (endTime.compareTo(startTime) < 0) {
+    if (!startTime.isBefore(endTime)) {
       throw BreakEndBeforeStartException();
     }
 

packages/flutter_availability_data_interface/lib/src/utils.dart

@@ -3,6 +3,9 @@ extension DateUtils on DateTime {
   /// Gets the date without the time
   DateTime get date => DateTime(year, month, day);
 
+  /// Gets the time without the date
+  DateTime get time => DateTime(0, 0, 0, hour, minute);
+
   /// Returns true if the time of the date matches the time of the other date
   bool timeMatches(DateTime other) =>
       other.hour == hour && other.minute == minute;