72 lines
2.4 KiB
C#
72 lines
2.4 KiB
C#
using UtopiaCanteenSystem.Models;
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namespace UtopiaCanteenSystem.Services;
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/// <summary>
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/// Resolves current meal session from production (MySQL meal_schedule). Caches schedules per site for 60 seconds.
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/// No SQLite; scan validation uses production data only.
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/// </summary>
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public class DbMealSessionResolver : IMealSessionResolver
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{
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private readonly IMealScheduleService _mealScheduleService;
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private readonly TimeSpan _cacheTtl = TimeSpan.FromSeconds(60);
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private readonly Dictionary<string, (List<MealSchedule> Schedules, DateTime ExpiryUtc)> _cache = new(StringComparer.OrdinalIgnoreCase);
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private readonly object _cacheLock = new();
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public DbMealSessionResolver(IMealScheduleService mealScheduleService)
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{
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_mealScheduleService = mealScheduleService;
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}
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/// <inheritdoc />
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public MealSession GetCurrentSession(DateTime nowLocal, string siteId)
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{
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var normalizedSite = (siteId ?? string.Empty).Trim();
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if (string.IsNullOrEmpty(normalizedSite))
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normalizedSite = "01";
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if (normalizedSite.Length == 1 && char.IsDigit(normalizedSite[0]))
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normalizedSite = normalizedSite.PadLeft(2, '0');
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var schedules = GetSchedulesForSiteCached(normalizedSite);
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var t = nowLocal.TimeOfDay;
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foreach (var s in schedules)
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{
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if (!TryParseTime(s.StartTime, out var start) || !TryParseTime(s.EndTime, out var end))
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continue;
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if (t >= start && t < end)
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return (MealSession)s.MealSession;
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}
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return MealSession.None;
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}
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private List<MealSchedule> GetSchedulesForSiteCached(string siteId)
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{
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lock (_cacheLock)
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{
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if (_cache.TryGetValue(siteId, out var entry) && DateTime.UtcNow < entry.ExpiryUtc)
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return entry.Schedules;
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}
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var list = _mealScheduleService.GetActiveSchedulesForSite(siteId).ToList();
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lock (_cacheLock)
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{
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_cache[siteId] = (list, DateTime.UtcNow.Add(_cacheTtl));
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}
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return list;
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}
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private static bool TryParseTime(string value, out TimeSpan time)
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{
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time = TimeSpan.Zero;
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if (string.IsNullOrWhiteSpace(value))
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return false;
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return TimeSpan.TryParse(value.Trim(), null, out time)
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|| TimeSpan.TryParse(value.Trim().Replace(".", ":"), null, out time);
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}
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}
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