Initial commit: Fixes for linting and compilation

lib/services/cycle_service.dart

@@ -0,0 +1,65 @@
+import '../models/user_profile.dart';
+import '../models/cycle_entry.dart';
+
+class CycleService {
+  /// Calculates the current cycle information based on user profile
+  static Map<String, dynamic> calculateCycleInfo(UserProfile? user) {
+    if (user?.lastPeriodStartDate == null) {
+      return {
+        'phase': CyclePhase.follicular,
+        'dayOfCycle': 1,
+        'daysUntilPeriod': user?.averageCycleLength ?? 28,
+        'isPeriodExpected': false,
+      };
+    }
+
+    final lastPeriod = user!.lastPeriodStartDate!;
+    final cycleLength = user.averageCycleLength;
+    final now = DateTime.now();
+    
+    // Normalize dates to midnight for accurate day counting
+    final startOfToday = DateTime(now.year, now.month, now.day);
+    final startOfLastPeriod = DateTime(lastPeriod.year, lastPeriod.month, lastPeriod.day);
+    
+    final daysSinceLastPeriod = startOfToday.difference(startOfLastPeriod).inDays + 1;
+    
+    // Handle cases where last period was long ago (more than one cycle)
+    final dayOfCycle = ((daysSinceLastPeriod - 1) % cycleLength) + 1;
+    final daysUntilPeriod = cycleLength - dayOfCycle;
+
+    CyclePhase phase;
+    if (dayOfCycle <= 5) {
+      phase = CyclePhase.menstrual;
+    } else if (dayOfCycle <= 13) {
+      phase = CyclePhase.follicular;
+    } else if (dayOfCycle <= 16) {
+      phase = CyclePhase.ovulation;
+    } else {
+      phase = CyclePhase.luteal;
+    }
+
+    return {
+      'phase': phase,
+      'dayOfCycle': dayOfCycle,
+      'daysUntilPeriod': daysUntilPeriod,
+      'isPeriodExpected': daysUntilPeriod <= 0 || dayOfCycle <= 5,
+    };
+  }
+
+  /// Format cycle day for display
+  static String getDayOfCycleDisplay(int day) => 'Day $day';
+
+  /// Get phase description
+  static String getPhaseDescription(CyclePhase phase) {
+    switch (phase) {
+      case CyclePhase.menstrual:
+        return 'Your body is resting and clearing. Be gentle with yourself.';
+      case CyclePhase.follicular:
+        return 'Energy and optimism are rising. A great time for new projects.';
+      case CyclePhase.ovulation:
+        return 'You are at your peak energy and fertility.';
+      case CyclePhase.luteal:
+        return 'Progesterone is rising. You may feel more introverted or sensitive.';
+    }
+  }
+}