Merge 3352cc5 into 5cda40d

albertms10 · Feb 14, 2023 · e93e4c0 · e93e4c0
2 parents 5cda40d + 3352cc5
commit e93e4c0
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Showing 2 changed files with 67 additions and 1 deletion.
diff --git a/lib/src/model/date/date_ranger.dart b/lib/src/model/date/date_ranger.dart
@@ -1,3 +1,5 @@
+import 'dart:math';
+
 import 'package:cabin_booking/utils/date_time_extension.dart';
 import 'package:cabin_booking/utils/time_of_day_extension.dart';
 import 'package:flutter/material.dart';
@@ -66,7 +68,7 @@ mixin DateRanger {
         endDate!.isAfter(dateTime);
   }
 
-  /// Whether this [DateRanger] overlaps with another [DateRanger].
+  /// Whether this [DateRanger] overlaps with [other].
   ///
   /// Example:
   /// ```dart
@@ -95,6 +97,46 @@ mixin DateRanger {
         endDate!.isAfter(other.startDate!);
   }
 
+  /// Returns the overlapping [Duration] with [other]. The operation is
+  /// commutative, returning the same result in both directions.
+  ///
+  /// Example:
+  /// ```dart
+  /// final dateRange1 = DateRange(
+  ///   startDate: DateTime(2022, 12, 4, 9, 15),
+  ///   endDate: DateTime(2022, 12, 4, 12, 15),
+  /// );
+  /// final dateRange2 = DateRange(
+  ///   startDate: DateTime(2022, 12, 4, 10, 15),
+  ///   endDate: DateTime(2022, 12, 4, 11, 15),
+  /// );
+  ///
+  /// final duration1 = dateRange1.overlappingDurationWith(dateRange2);
+  /// assert(duration1 == const Duration(hours: 1));
+  ///
+  /// final duration2 = dateRange2.overlappingDurationWith(dateRange1);
+  /// assert(duration1 == duration2);
+  /// ```
+  Duration overlappingDurationWith(DateRanger other) {
+    if (hasInfiniteStart && hasInfiniteEnd ||
+        other.hasInfiniteStart && other.hasInfiniteEnd) return Duration.zero;
+    if (hasInfiniteStart && !other.hasInfiniteStart) {
+      return endDate!.difference(other.startDate!);
+    }
+    if (hasInfiniteEnd && !other.hasInfiniteEnd) {
+      return startDate!.difference(other.endDate!);
+    }
+    if (startDate!.isBefore(other.endDate!) &&
+        endDate!.isAfter(other.startDate!)) {
+      return Duration(
+        milliseconds:
+            min<int>(duration.inMilliseconds, other.duration.inMilliseconds),
+      );
+    }
+
+    return Duration.zero;
+  }
+
   /// Whether this [DateRanger] has [startDate] and [endDate] values.
   ///
   /// Examples:

diff --git a/test/model/date/date_ranger_test.dart b/test/model/date/date_ranger_test.dart
@@ -224,6 +224,30 @@ void main() {
       );
     });
 
+    group('.overlappingDurationWith()', () {
+      test(
+        'should return the overlapping duration with another DateRanger',
+        () {
+          final dateRange1 = DateRange(
+            startDate: DateTime(2022, 12, 4, 9, 15),
+            endDate: DateTime(2022, 12, 4, 12, 15),
+          );
+          final dateRange2 = DateRange(
+            startDate: DateTime(2022, 12, 4, 10, 15),
+            endDate: DateTime(2022, 12, 4, 11, 15),
+          );
+          expect(
+            dateRange1.overlappingDurationWith(dateRange2),
+            const Duration(hours: 1),
+          );
+          expect(
+            dateRange1.overlappingDurationWith(dateRange2),
+            dateRange2.overlappingDurationWith(dateRange1),
+          );
+        },
+      );
+    });
+
     group('.isFinite', () {
       test('should return true when this DateRanger is finite', () {
         final dateRange = DateRange(