using Quartz;
using Quartz.Spi;
using Xunit.Abstractions;

namespace QuartzPitfalls;

public class TriggerUtilsTests
{
    private readonly ITestOutputHelper _testOutputHelper;

    public TriggerUtilsTests(ITestOutputHelper testOutputHelper)
    {
        _testOutputHelper = testOutputHelper;
    }
    
    [Theory]
    [InlineData("2026-01-01 08:00:00Z","2026-01-07 08:00:01Z")] // Estimation interval matches trigger start and end
    [InlineData("2026-01-01 07:50:00Z","2026-01-07 08:00:01Z")] // Estimation interval starts 10 minutes earlier than trigger
    public void Trigger_should_run_only_first_week_of_january_2026(string fromUtc, string toUtc)
    {
        // Arrange: Start in the first week of January 2026 for one week
        
        var startAt = DateTimeOffset.Parse("2026-01-01 08:00:00Z"); // Start at 8.00 exactly 
        var endAt = DateTimeOffset.Parse("2026-01-07 08:00:01Z");   // End after a week
        
        var trigger = TriggerBuilder.Create()
            .StartAt(startAt)
            .EndAt(endAt)
            .WithSimpleSchedule(x => x.WithIntervalInHours(24).RepeatForever()) // Each day
            .Build(); 
        
        ICalendar? calendar = null;

        // Act

        var from = DateTimeOffset.Parse(fromUtc);
        var to = DateTimeOffset.Parse(toUtc);
        var actualFireTimes = TriggerUtils.ComputeFireTimesBetween((IOperableTrigger) trigger, calendar, from, to);

        // Assert: Run each day at 8.00 exactly for one week 

        var expectedFireTimes = new[]
        {
            "2026-01-01 08:00:00Z",
            "2026-01-02 08:00:00Z",
            "2026-01-03 08:00:00Z",
            "2026-01-04 08:00:00Z",
            "2026-01-05 08:00:00Z",
            "2026-01-06 08:00:00Z",
            "2026-01-07 08:00:00Z",
        };

        foreach (var actualFireTime in actualFireTimes)
            _testOutputHelper.WriteLine($"{actualFireTime.UtcDateTime}");
        
        Assert.Equal(expectedFireTimes.Select(DateTimeOffset.Parse), actualFireTimes);
    }
}