using w4c_workflows.Models;
using w4c_workflows.Services.Triggers;
using Xunit;

namespace w4c_workflows.Tests;

public class TriggerDueTests
{
    private static readonly DateTimeOffset Now = new(2026, 8, 28, 14, 30, 0, TimeSpan.Zero);

    private static TriggerSpec Interval(string interval) =>
        TriggerSpec.Parse($"{{\"type\":\"interval\",\"interval\":\"{interval}\"}}", out _)!;

    private static TriggerSpec Cron(string expr) =>
        TriggerSpec.Parse($"{{\"type\":\"cron\",\"cron\":\"{expr}\"}}", out _)!;

    [Fact]
    public void Fires_on_first_discovery_when_no_last_fire()
    {
        Assert.True(TriggerDue.IsDue(Interval("30m"), null, Now));
        Assert.True(TriggerDue.IsDue(Cron("0 9 * * *"), null, Now));
    }

    [Fact]
    public void Interval_not_due_before_elapse()
    {
        var lastFire = Now.AddMinutes(-10);
        Assert.False(TriggerDue.IsDue(Interval("30m"), lastFire, Now));
    }

    [Fact]
    public void Interval_due_once_elapsed()
    {
        var lastFire = Now.AddMinutes(-31);
        Assert.True(TriggerDue.IsDue(Interval("30m"), lastFire, Now));
    }

    [Fact]
    public void Interval_zero_is_never_due()
    {
        var spec = new TriggerSpec(TriggerType.Interval, null, TimeSpan.Zero, null, null);
        Assert.False(TriggerDue.IsDue(spec, Now.AddHours(-1), Now));
    }

    [Fact]
    public void Cron_due_when_next_occurrence_has_passed()
    {
        // 9:00 daily; last fired yesterday 09:00, now past today's 09:00.
        var lastFire = new DateTimeOffset(2026, 8, 27, 9, 0, 0, TimeSpan.Zero);
        Assert.True(TriggerDue.IsDue(Cron("0 9 * * *"), lastFire, Now));
    }

    [Fact]
    public void Cron_not_due_when_next_occurrence_in_future()
    {
        var lastFire = Now.AddMinutes(-1); // fired 1 minute ago; next daily 09:00 is future
        Assert.False(TriggerDue.IsDue(Cron("0 9 * * *"), lastFire, Now));
    }

    [Fact]
    public void Unknown_type_is_never_due()
    {
        var spec = new TriggerSpec("webhook", null, null, "/h/x", null);
        Assert.False(TriggerDue.IsDue(spec, Now.AddHours(-1), Now));
    }
}