65 lines
2.5 KiB
C#
65 lines
2.5 KiB
C#
using LehrerApp.Core.Models;
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namespace LehrerApp.Core.Services;
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public enum SchoolYearPeriodKind { FullYear, H1, H2 }
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/// <summary>
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/// Gemeinsame Regeln für zeitlich begrenzte Gruppenzugehörigkeiten.
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/// Eintritt und Austritt gelten unabhängig vom gewählten Halbjahresmodus.
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/// </summary>
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public static class GroupMembershipService
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{
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public static bool IsActiveOn(GroupMembership membership, DateOnly date)
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{
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if (membership.JoinedAt is { } joinedAt && date < joinedAt) return false;
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if (membership.LeftAt is { } leftAt && date > leftAt) return false;
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return membership.Period switch
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{
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MembershipPeriod.H1Only => IsFirstSemester(date),
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MembershipPeriod.H2Only => !IsFirstSemester(date),
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_ => true,
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};
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}
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public static bool Overlaps(GroupMembership membership, DateOnly from, DateOnly to)
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{
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if (to < from) return false;
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var effectiveFrom = membership.JoinedAt is { } joinedAt && joinedAt > from ? joinedAt : from;
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var effectiveTo = membership.LeftAt is { } leftAt && leftAt < to ? leftAt : to;
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if (effectiveTo < effectiveFrom) return false;
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if (membership.Period is MembershipPeriod.FullYear or MembershipPeriod.Custom) return true;
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for (var month = new DateOnly(effectiveFrom.Year, effectiveFrom.Month, 1);
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month <= effectiveTo;
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month = month.AddMonths(1))
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{
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if (membership.Period == MembershipPeriod.H1Only && IsFirstSemester(month)) return true;
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if (membership.Period == MembershipPeriod.H2Only && !IsFirstSemester(month)) return true;
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}
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return false;
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}
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public static (DateOnly From, DateOnly To) SchoolYearPeriod(
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string schoolYear, SchoolYearPeriodKind period)
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{
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var slash = schoolYear.IndexOf('/');
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var startText = slash >= 0 ? schoolYear[..slash] : schoolYear;
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if (!int.TryParse(startText, out var startYear))
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throw new ArgumentException("Ungültiges Schuljahr.", nameof(schoolYear));
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return period switch
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{
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SchoolYearPeriodKind.H1 => (new DateOnly(startYear, 8, 1), new DateOnly(startYear + 1, 1, 31)),
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SchoolYearPeriodKind.H2 => (new DateOnly(startYear + 1, 2, 1), new DateOnly(startYear + 1, 7, 31)),
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_ => (new DateOnly(startYear, 8, 1), new DateOnly(startYear + 1, 7, 31)),
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};
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}
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private static bool IsFirstSemester(DateOnly date) => date.Month >= 8 || date.Month <= 1;
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}
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