using LehrerApp.Core.Services;
using Xunit;

namespace LehrerApp.Tests;

public sealed class PeriodScheduleServiceTests
{
    [Fact]
    public void NeueKonfiguration_HatKeineStundenHinterlegt()
    {
        using var temp = new TempAppData();
        var service = new PeriodScheduleService(temp.Path);

        Assert.Empty(service.Periods);
        Assert.Null(service.GetTimes(1));
        Assert.Equal(0, service.GetDurationMinutes(1));
    }

    [Fact]
    public void SetPeriods_WirdUeberNeueInstanzHinwegPersistiert()
    {
        using var temp = new TempAppData();
        new PeriodScheduleService(temp.Path).SetPeriods(
        [
            new PeriodTimeEntry { PeriodNumber = 1, Start = new TimeOnly(8, 0), End = new TimeOnly(8, 45) },
            new PeriodTimeEntry { PeriodNumber = 2, Start = new TimeOnly(8, 45), End = new TimeOnly(9, 30) },
        ]);

        var second = new PeriodScheduleService(temp.Path);

        Assert.Equal(45, second.GetDurationMinutes(1));
        Assert.Equal((new TimeOnly(8, 45), new TimeOnly(9, 30)), second.GetTimes(2));
    }

    [Fact]
    public void SetPeriods_ErsetztVorherigeKonfigurationVollstaendig()
    {
        using var temp = new TempAppData();
        var service = new PeriodScheduleService(temp.Path);
        service.SetPeriods([new PeriodTimeEntry { PeriodNumber = 1, Start = new TimeOnly(8, 0), End = new TimeOnly(8, 45) }]);

        service.SetPeriods([new PeriodTimeEntry { PeriodNumber = 2, Start = new TimeOnly(8, 45), End = new TimeOnly(9, 30) }]);

        Assert.Null(service.GetTimes(1));
        Assert.NotNull(service.GetTimes(2));
    }

    private sealed class TempAppData : IDisposable
    {
        public string Path { get; } = System.IO.Path.Combine(
            System.IO.Path.GetTempPath(), $"lehrerapp-periodschedule-tests-{Guid.NewGuid():N}");

        public TempAppData() => Directory.CreateDirectory(Path);
        public void Dispose() { if (Directory.Exists(Path)) Directory.Delete(Path, recursive: true); }
    }
}