✨ Days countdown

lib/providers/special_day.dart

@@ -0,0 +1,122 @@
+import 'package:flutter/widgets.dart';
+import 'package:provider/provider.dart';
+import 'package:surface/providers/userinfo.dart';
+
+// Stored as key: month, day
+const Map<String, (int, int)> kSpecialDays = {
+  // Birthday is dynamically generated according to the user's profile
+  'NewYear': (1, 1),
+  'MerryXmas': (12, 25),
+};
+
+const Map<String, String> kSpecialDaysSymbol = {
+  'Birthday': '🎂',
+  'NewYear': '🎉',
+  'MerryXmas': '🎄',
+};
+
+class SpecialDayProvider {
+  late final UserProvider _user;
+
+  SpecialDayProvider(BuildContext context) {
+    _user = context.read<UserProvider>();
+  }
+
+  List<String> getSpecialDays() {
+    final now = DateTime.now().toLocal();
+    final birthday = _user.user?.profile?.birthday?.toLocal();
+    final isBirthday = birthday != null && birthday.day == now.day && birthday.month == now.month;
+
+    return [
+      if (isBirthday) 'Birthday',
+      ...kSpecialDays.keys.where(
+        (key) => kSpecialDays[key]!.$1 == now.month && kSpecialDays[key]!.$2 == now.day,
+      ),
+    ];
+  }
+
+  (String, DateTime)? getLastSpecialDay() {
+    final now = DateTime.now().toLocal();
+    final birthday = _user.user?.profile?.birthday?.toLocal();
+
+    final Map<String, (int, int)> specialDays = {
+      if (birthday != null) 'Birthday': (birthday.month, birthday.day),
+      ...kSpecialDays,
+    };
+
+    DateTime? lastDate;
+    String? lastEvent;
+
+    for (final entry in specialDays.entries) {
+      final eventName = entry.key;
+      final (month, day) = entry.value;
+
+      var specialDayThisYear = DateTime(now.year, month, day);
+      var specialDayLastYear = DateTime(now.year - 1, month, day);
+
+      if (specialDayThisYear.isBefore(now)) {
+        if (lastDate == null || specialDayThisYear.isAfter(lastDate)) {
+          lastDate = specialDayThisYear;
+          lastEvent = eventName;
+        }
+      } else if (specialDayLastYear.isBefore(now)) {
+        if (lastDate == null || specialDayLastYear.isAfter(lastDate)) {
+          lastDate = specialDayLastYear;
+          lastEvent = eventName;
+        }
+      }
+    }
+
+    if (lastEvent != null && lastDate != null) {
+      return (lastEvent, lastDate);
+    }
+
+    return null;
+  }
+
+  (String, DateTime)? getNextSpecialDay() {
+    final now = DateTime.now().toLocal();
+    final birthday = _user.user?.profile?.birthday?.toLocal();
+
+    // Stored as key: month, day
+    final Map<String, (int, int)> specialDays = {
+      if (birthday != null) 'Birthday': (birthday.month, birthday.day),
+      ...kSpecialDays,
+    };
+
+    DateTime? closestDate;
+    String? closestEvent;
+
+    for (final entry in specialDays.entries) {
+      final eventName = entry.key;
+      final (month, day) = entry.value;
+
+      // Calculate the special day's DateTime in the current year
+      var specialDay = DateTime(now.year, month, day);
+
+      // If the special day has already passed this year, consider it for the next year
+      if (specialDay.isBefore(now)) {
+        specialDay = DateTime(now.year + 1, month, day);
+      }
+
+      // Check if this special day is closer than the previously found one
+      if (closestDate == null || specialDay.isBefore(closestDate)) {
+        closestDate = specialDay;
+        closestEvent = eventName;
+      }
+    }
+
+    if (closestEvent != null && closestDate != null) {
+      return (closestEvent, closestDate);
+    }
+
+    // No special day found
+    return null;
+  }
+
+  double getSpecialDayProgress(DateTime last, DateTime next) {
+    final totalDuration = next.difference(last).inSeconds.toDouble();
+    final elapsedDuration = DateTime.now().difference(last).inSeconds.toDouble();
+    return (elapsedDuration / totalDuration).clamp(0.0, 1.0);
+  }
+}