using LehrerApp.Core.Models;
using LehrerApp.Core.Services;
using Xunit;

namespace LehrerApp.Tests;

public class GroupMembershipServiceTests
{
    [Fact]
    public void IsActiveOn_BeruecksichtigtEinUndAustrittAuchBeiGanzemJahr()
    {
        var membership = new GroupMembership
        {
            Period = MembershipPeriod.FullYear,
            JoinedAt = new DateOnly(2025, 9, 1),
            LeftAt = new DateOnly(2025, 10, 15),
        };

        Assert.False(GroupMembershipService.IsActiveOn(membership, new DateOnly(2025, 8, 31)));
        Assert.True(GroupMembershipService.IsActiveOn(membership, new DateOnly(2025, 9, 1)));
        Assert.True(GroupMembershipService.IsActiveOn(membership, new DateOnly(2025, 10, 15)));
        Assert.False(GroupMembershipService.IsActiveOn(membership, new DateOnly(2025, 10, 16)));
    }

    [Theory]
    [InlineData(2025, 12, 1, true)]
    [InlineData(2026, 1, 31, true)]
    [InlineData(2026, 2, 1, false)]
    public void IsActiveOn_BeruecksichtigtHalbjahresmodus(int year, int month, int day, bool expected)
    {
        var membership = new GroupMembership { Period = MembershipPeriod.H1Only };

        Assert.Equal(expected,
            GroupMembershipService.IsActiveOn(membership, new DateOnly(year, month, day)));
    }

    [Fact]
    public void Overlaps_FindetTeilweiseZugehoerigkeitImHalbjahr()
    {
        var membership = new GroupMembership
        {
            Period = MembershipPeriod.Custom,
            JoinedAt = new DateOnly(2025, 12, 15),
            LeftAt = new DateOnly(2026, 3, 10),
        };
        var h1 = GroupMembershipService.SchoolYearPeriod("2025/26", SchoolYearPeriodKind.H1);
        var h2 = GroupMembershipService.SchoolYearPeriod("2025/26", SchoolYearPeriodKind.H2);

        Assert.True(GroupMembershipService.Overlaps(membership, h1.From, h1.To));
        Assert.True(GroupMembershipService.Overlaps(membership, h2.From, h2.To));
        Assert.False(GroupMembershipService.Overlaps(membership,
            new DateOnly(2026, 4, 1), new DateOnly(2026, 7, 31)));
    }
}