using System;
using System.Collections.Generic;
using System.Text;
using DotNetCore.CAP.Job;
using Xunit;

namespace DotNetCore.CAP.Test.Job
{
    public class ComputedJobTest
    {
        [Fact]
        public void UpdateNext_LastRunNever_SchedulesNow()
        {
            // Arrange
            var now = new DateTime(2000, 1, 1, 8, 0, 0);
            var cronJob = new CronJob(Cron.Daily());
            var computed = new ComputedCronJob(cronJob);

            // Act
            computed.UpdateNext(now);

            // Assert
            Assert.Equal(computed.Next, now);
        }

        [Fact]
        public void UpdateNext_LastRun_BeforePrev_SchedulesNow()
        {
            // Arrange
            var now = new DateTime(2000, 1, 1, 8, 0, 0);
            var cronJob = new CronJob(Cron.Daily(), now.Subtract(TimeSpan.FromDays(2)));
            var computed = new ComputedCronJob(cronJob);

            // Act
            computed.UpdateNext(now);

            // Assert
            Assert.Equal(computed.Next, now);
        }

        [Fact]
        public void UpdateNext_LastRun_AfterPrev_SchedulesNormal()
        {
            // Arrange
            var now = new DateTime(2000, 1, 1, 8, 0, 0);
            var cronJob = new CronJob(Cron.Daily(), now.Subtract(TimeSpan.FromSeconds(5)));
            var computed = new ComputedCronJob(cronJob);

            // Act
            computed.UpdateNext(now);

            // Assert
            Assert.True(computed.Next > now);
        }
    }
}