✨ Notable days (holiday)

DysonNetwork.Pass/Account/NotableDaysService.cs

@@ -0,0 +1,34 @@
+using DysonNetwork.Shared.Cache;
+using Nager.Holiday;
+
+namespace DysonNetwork.Pass.Account;
+
+public class NotableDaysService(ICacheService cache)
+{
+    private const string NotableDaysCacheKeyPrefix = "notable:";
+
+    public async Task<List<NotableDay>> GetNotableDays(int? year, string regionCode)
+    {
+        year ??= DateTime.UtcNow.Year;
+
+        // Generate cache key using year and region code
+        var cacheKey = $"{NotableDaysCacheKeyPrefix}:{year}:{regionCode}";
+
+        // Try to get from cache first
+        var (found, cachedDays) = await cache.GetAsyncWithStatus<List<NotableDay>>(cacheKey);
+        if (found && cachedDays != null)
+        {
+            return cachedDays;
+        }
+
+        // If not in cache, fetch from API
+        using var holidayClient = new HolidayClient();
+        var holidays = await holidayClient.GetHolidaysAsync(year.Value, regionCode);
+        var days = holidays?.Select(NotableDay.FromNagerHoliday).ToList() ?? [];
+
+        // Cache the result for 1 day (holiday data doesn't change frequently)
+        await cache.SetAsync(cacheKey, days, TimeSpan.FromDays(1));
+
+        return days;
+    }
+}