using System;

using Cosmos.TestRunner;

namespace Cosmos.Compiler.Tests.Bcl.System
{
    internal static class DateTimeTests
    {
        public static void Execute()
        {
            var someDateTime = new DateTime(2017, 4, 7, 16, 47, 32, 462);

            Assert.IsTrue(someDateTime.Year == 2017, "DateTime.Year is not working");
            Assert.IsTrue(someDateTime.Month == 4, "DateTime.Month is not working");
            Assert.IsTrue(someDateTime.Day == 7, "DateTime.Day is not working");
            Assert.IsTrue(someDateTime.Hour == 16, "DateTime.Hour is not working");
            Assert.IsTrue(someDateTime.Minute == 47, "DateTime.Minute is not working");
            Assert.IsTrue(someDateTime.Second == 32, "DateTime.Second is not working");
            Assert.IsTrue(someDateTime.Millisecond == 462, "DateTime.Millisecond is not working");
            // Not works: DayOfWeek is an Enum and Enum.ToString() is yet not implemented
            //Assert.IsTrue(someDateTime.DayOfWeek.ToString() == "Friday", "DateTime.DayOfWeek is not working " + someDateTime.DayOfWeek.ToString());
            Assert.IsTrue(someDateTime.DayOfYear == 97, "DateTime.DayOfYear is not working");

            Assert.IsTrue(DateTime.Now.Year >= 2018, "DateTime.Now is returning an year lower than 2018");

            // We assume that Cosmos uses Invariant Culture to display dates
            //Assert.IsTrue(someDateTime.ToString() == "2017-04-07 16:47:32", "DateTime.ToString() is not working");
            Assert.IsTrue(someDateTime.ToString() == "04/07/2017 16:47:32", "DateTime.ToString() is not working");
            Assert.IsTrue(someDateTime.ToLongDateString() == "Friday, 07 April 2017", "DateTime.ToLongDateString() is not working");
            Assert.IsTrue(someDateTime.ToShortDateString() == "04/07/2017", "DateTime.ToShortDateString() is not working");
            Assert.IsTrue(someDateTime.ToLongTimeString() == "16:47:32", "DateTime.ToLongTimeString() is not working");
            Assert.IsTrue(someDateTime.ToShortTimeString() == "16:47", "DateTime.ToShortTimeString() is not working");

            TimeSpan twoDaysTimeSpan = TimeSpan.FromDays(2);

            someDateTime = someDateTime.Add(twoDaysTimeSpan);
            Assert.IsTrue(someDateTime.Day == 9, "DateTime.Add() is not working");

            someDateTime = someDateTime.Subtract(twoDaysTimeSpan);
            Assert.IsTrue(someDateTime.Day == 7, "DateTime.Subtract() is not working");
        }
    }
}