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DateTimeHelperTests.cs

using FluentAssertions;
using Nop.Core.Domain.Customers;
using Nop.Services.Common;
using Nop.Services.Configuration;
using Nop.Services.Customers;
using Nop.Services.Helpers;
using NUnit.Framework;

namespace Nop.Tests.Nop.Services.Tests.Helpers;

[TestFixture]
public class DateTimeHelperTests : ServiceTest
{
    private ICustomerService _customerService;
    private IGenericAttributeService _genericAttributeService;
    private DateTimeSettings _dateTimeSettings;
    private IDateTimeHelper _dateTimeHelper;
    private ISettingService _settingService;
    private Customer _customer;

    /// 
    /// (GMT+02:00) Minsk
    /// 
    private string _gmtPlus2MinskTimeZoneId;

    /// 
    /// (GMT+03:00) Moscow, St. Petersburg, Volgograd
    /// 
    private string _gmtPlus3MoscowTimeZoneId;

    /// 
    /// (GMT+07:00) Krasnoyarsk
    /// 
    private string _gmtPlus7KrasnoyarskTimeZoneId;

    private string _defaultTimeZone;
    private bool _defaultAllowCustomersToSetTimeZone;
    private string _defaultDefaultStoreTimeZoneId;

    [OneTimeSetUp]
    public async Task SetUp()
    {
        _customerService = GetService();
        _genericAttributeService = GetService();
        _dateTimeSettings = GetService();
        _dateTimeHelper = GetService();
        _settingService = GetService();

        _customer = await GetService().GetCustomerByEmailAsync(NopTestsDefaults.AdminEmail);

        _defaultTimeZone = _customer.TimeZoneId;

        _defaultAllowCustomersToSetTimeZone = _dateTimeSettings.AllowCustomersToSetTimeZone;
        _defaultDefaultStoreTimeZoneId = _dateTimeSettings.DefaultStoreTimeZoneId;

        _gmtPlus2MinskTimeZoneId = "E. Europe Standard Time";  //(GMT+02:00) Minsk
        _gmtPlus3MoscowTimeZoneId = "Russian Standard Time"; //(GMT+03:00) Moscow, St. Petersburg, Volgograd
        _gmtPlus7KrasnoyarskTimeZoneId = "North Asia Standard Time"; //(GMT+07:00) Krasnoyarsk;

        if (Environment.OSVersion.Platform != PlatformID.Unix)
            return;

        _gmtPlus2MinskTimeZoneId = "Europe/Minsk";  //(GMT+02:00) Minsk;
        _gmtPlus3MoscowTimeZoneId = "Europe/Moscow"; //(GMT+03:00) Moscow, St. Petersburg, Volgograd
        _gmtPlus7KrasnoyarskTimeZoneId = "Asia/Krasnoyarsk"; //(GMT+07:00) Krasnoyarsk;
    }

    [OneTimeTearDown]
    public async Task TearDown()
    {
        _customer.TimeZoneId = _defaultTimeZone;
        _dateTimeSettings.AllowCustomersToSetTimeZone = _defaultAllowCustomersToSetTimeZone;
        _dateTimeSettings.DefaultStoreTimeZoneId = _defaultDefaultStoreTimeZoneId;

        await _settingService.SaveSettingAsync(_dateTimeSettings);
    }

    [Test]
    public void CanGetAllSystemTimeZones()
    {
        var systemTimeZones = _dateTimeHelper.GetSystemTimeZones();
        systemTimeZones.Should().NotBeNull();
        systemTimeZones.Any().Should().BeTrue();
    }

    [Test]
    public async Task CanGetCustomerTimeZoneWithCustomTimeZonesEnabled()
    {
        _dateTimeSettings.AllowCustomersToSetTimeZone = true;
        _dateTimeSettings.DefaultStoreTimeZoneId = _gmtPlus2MinskTimeZoneId; //(GMT+02:00) Minsk;
        await _settingService.SaveSettingAsync(_dateTimeSettings);

        _customer.TimeZoneId = _gmtPlus3MoscowTimeZoneId;
        await _customerService.UpdateCustomerAsync(_customer);

        var timeZone = await GetService().GetCustomerTimeZoneAsync(_customer);
        timeZone.Should().NotBeNull();
        timeZone.Id.Should().Be(_gmtPlus3MoscowTimeZoneId);
    }

    [Test]
    public async Task CanGetCustomerTimezoneWithCustomTimeZonesDisabled()
    {
        _dateTimeSettings.AllowCustomersToSetTimeZone = false;
        _dateTimeSettings.DefaultStoreTimeZoneId = _gmtPlus2MinskTimeZoneId; //(GMT+02:00) Minsk;
        await _settingService.SaveSettingAsync(_dateTimeSettings);

        _customer.TimeZoneId = _gmtPlus3MoscowTimeZoneId;
        await _customerService.UpdateCustomerAsync(_customer);

        var timeZone = await GetService().GetCustomerTimeZoneAsync(_customer);
        timeZone.Should().NotBeNull();
        timeZone.Id.Should().Be(_gmtPlus2MinskTimeZoneId);  //(GMT+02:00) Minsk
    }

    [Test]
    public void CanConvertDatetimeToUserTime()
    {
        var sourceDateTime = TimeZoneInfo.FindSystemTimeZoneById(_gmtPlus2MinskTimeZoneId); //(GMT+02:00) Minsk;
        sourceDateTime.Should().NotBeNull();

        var destinationDateTime = TimeZoneInfo.FindSystemTimeZoneById(_gmtPlus7KrasnoyarskTimeZoneId); //(GMT+07:00) Krasnoyarsk;
        destinationDateTime.Should().NotBeNull();

        //summer time
        _dateTimeHelper.ConvertToUserTime(new DateTime(2010, 06, 01, 0, 0, 0), sourceDateTime, destinationDateTime)
            .Should().Be(new DateTime(2010, 06, 01, 5, 0, 0));

        //winter time
        _dateTimeHelper.ConvertToUserTime(new DateTime(2010, 01, 01, 0, 0, 0), sourceDateTime, destinationDateTime)
            .Should().Be(new DateTime(2010, 01, 01, 5, 0, 0));
    }

    [Test]
    public void CanConvertDatetimeToUtcDateTime()
    {
        var sourceDateTime = TimeZoneInfo.FindSystemTimeZoneById(_gmtPlus2MinskTimeZoneId); //(GMT+02:00) Minsk;
        sourceDateTime.Should().NotBeNull();

        //summer time
        var dateTime1 = new DateTime(2010, 06, 01, 0, 0, 0);
        var convertedDateTime1 = _dateTimeHelper.ConvertToUtcTime(dateTime1, sourceDateTime);
        convertedDateTime1.Should().Be(new DateTime(2010, 05, 31, 21, 0, 0));

        //winter time
        var dateTime2 = new DateTime(2010, 01, 01, 0, 0, 0);
        var convertedDateTime2 = _dateTimeHelper.ConvertToUtcTime(dateTime2, sourceDateTime);
        convertedDateTime2.Should().Be(new DateTime(2009, 12, 31, 22, 0, 0));
    }
}