using System;
using NUnit.Framework;
using Developpez.Dotnet;

namespace Developpez.Dotnet.Tests
{
    [TestFixture]
    public class DateExtensionsTests
    {

        private DateTime y2k = new DateTime(2000, 1, 1);
        private long y2kAsUnix = 946684800;

        [Test]
        public void Check_that_20_minutes_from_is_correct()
        {
            Assert.AreEqual(20.Minutes().From(y2k), y2k.AddMinutes(20));
        }

        [Test]
        public void Check_that_20_minutes_fromnow_is_correct()
        {
            Assert.AreEqual(20.Minutes().FromNow(), DateTime.Now.AddMinutes(20));
        }

        [Test]
        public void Check_that_20_minutes_before_is_correct()
        {
            Assert.AreEqual(20.Minutes().Before(y2k), y2k.AddMinutes(-20));
        }

        [Test]
        public void Check_that_20_minutes_ago_is_correct()
        {
            Assert.AreEqual(20.Minutes().Ago(), DateTime.Now.AddMinutes(-20));
        }

        [Test]
        public void Check_that_20_hours_is_correct()
        {
            Assert.AreEqual(20.Hours(), TimeSpan.FromHours(20));
        }

        [Test]
        public void Check_that_20_seconds_is_correct()
        {
            Assert.AreEqual(20.Seconds(), TimeSpan.FromSeconds(20));
        }

        [Test]
        public void Check_that_20_days_is_correct()
        {
            Assert.AreEqual(20.Days(), TimeSpan.FromDays(20));
        }

        [Test]
        public void Check_that_ToUnixTimestamp_Returns_y2kasUnix_timestamp_when_given_y2k()
        {
            Assert.AreEqual(y2k.ToUnixTimestamp(), y2kAsUnix);
        }

        [Test]
        public void Check_that_ToDateTime_Returns_y2k_timestamp_when_given_y2kAsUnix()
        {
            Assert.AreEqual(y2kAsUnix.ToDateTime(), y2k);
        }

        [Test]
        public void Check_next_previous_DayOfWeek()
        {
            DateTime date = new DateTime(1981, 9, 10);
            DateTime nextSaturday = date.Next(DayOfWeek.Saturday);
            Assert.AreEqual(new DateTime(1981, 9, 12), nextSaturday);
            DateTime lastMonday = date.Previous(DayOfWeek.Monday);
            Assert.AreEqual(new DateTime(1981, 9, 7), lastMonday);
        }
    }
}