using KArtSell.Modules.ModelOperations.Domain;
namespace KArtSell.ModelOperations.UnitTests;
public sealed class ScheduleOccurrencePlannerTests
{
    [Fact] public void Daily_anchor_does_not_drift_to_dispatch_time()
    {
        var scheduled = new DateTimeOffset(2026, 8, 1, 1, 0, 0, TimeSpan.Zero);
        var next = ScheduleOccurrencePlanner.GetNextDueAt(scheduled, "DAILY", "LATEST_ONLY", 1, scheduled.AddHours(10));
        Assert.Equal(scheduled.AddDays(1), next);
    }
    [Fact] public void Missed_occurrences_are_skipped_without_dispatch_storm()
    {
        var scheduled = new DateTimeOffset(2026, 7, 1, 1, 0, 0, TimeSpan.Zero);
        var next = ScheduleOccurrencePlanner.GetNextDueAt(scheduled, "DAILY", "LATEST_ONLY", 1, new DateTimeOffset(2026, 8, 1, 4, 0, 0, TimeSpan.Zero));
        Assert.True(next > new DateTimeOffset(2026, 8, 1, 4, 0, 0, TimeSpan.Zero));
        Assert.Equal(1, next.Hour);
    }

    [Fact] public void All_with_limit_dispatches_only_the_most_recent_configured_occurrences()
    {
        var scheduled = new DateTimeOffset(2026, 8, 1, 1, 0, 0, TimeSpan.Zero);
        var plan = ScheduleOccurrencePlanner.Plan(scheduled, "DAILY", "ALL_WITH_LIMIT", 2, new DateTimeOffset(2026, 8, 4, 4, 0, 0, TimeSpan.Zero));

        Assert.Equal([scheduled.AddDays(2), scheduled.AddDays(3)], plan.OccurrencesToDispatch);
        Assert.Equal(scheduled.AddDays(4), plan.NextDueAt);
    }

    [Fact] public void Skip_missed_advances_without_dispatching_a_stale_occurrence()
    {
        var scheduled = new DateTimeOffset(2026, 8, 1, 1, 0, 0, TimeSpan.Zero);
        var plan = ScheduleOccurrencePlanner.Plan(scheduled, "DAILY", "SKIP_MISSED", 1, new DateTimeOffset(2026, 8, 3, 4, 0, 0, TimeSpan.Zero));

        Assert.Empty(plan.OccurrencesToDispatch);
        Assert.Equal(scheduled.AddDays(3), plan.NextDueAt);
    }
}