using System.Globalization;
using Connected;
using Connected.Data;
using Connected.Globalization;
using Connected.Globalization.Languages;
using Connected.Security.Identity;
using Connected.ServiceModel;

namespace Common.Globalization;

internal class GlobalizationService : IGlobalizationService
{
	private ILanguage _language;
	private CultureInfo _culture;
	public GlobalizationService(IIdentityService identityService, ILanguageService languageService)
	{
		IdentityService = identityService;
		LanguageService = languageService;
	}

	private IIdentityService IdentityService { get; }
	private ILanguageService LanguageService { get; }

	public TimeZoneInfo TimeZone
	{
		get
		{
			if (!IdentityService.IsAuthenticated || IdentityService.CurrentUser is null)
				return TimeZoneInfo.Utc;
			else
			{
				try
				{
					if (TimeZoneInfo.FindSystemTimeZoneById(IdentityService.CurrentUser.TimeZone) is not TimeZoneInfo timezone)
						return TimeZoneInfo.Utc;
					else
						return timezone;
				}
				catch
				{
					return TimeZoneInfo.Utc;
				}
			}

		}
	}

	public DateTimeOffset Now => FromUtc(DateTimeOffset.UtcNow);

	public async Task<ILanguage?> GetCurrentLanguage()
	{
		if (_language is null)
		{
			if (IdentityService.CurrentUser is not null && IdentityService.CurrentUser.Language > 0)
				_language = await LanguageService.Select(new PrimaryKeyArgs<int>() { Id = IdentityService.CurrentUser.Language });

			if (_language is not null && _language.Status == Status.Disabled)
				_language = null;
		}

		return _language;
	}
	public async Task<CultureInfo> GetCurrentCulture()
	{
		if (_culture is null)
		{
			if (await GetCurrentLanguage() is not ILanguage language)
				_culture = Thread.CurrentThread.CurrentUICulture;
			else
			{
				try
				{
					if (CultureInfo.GetCultureInfo(language.Lcid) is not CultureInfo culture)
						_culture = Thread.CurrentThread.CurrentUICulture;
				}
				catch
				{
					_culture = Thread.CurrentThread.CurrentUICulture;
				}
			}
		}

		return _culture;
	}

	public DateTime FromUtc(DateTime value)
	{
		return DateExtensions.FromUtc(value, TimeZone);
	}

	public DateTimeOffset FromUtc(DateTimeOffset value)
	{
		return DateExtensions.FromUtc(value, TimeZone);
	}

	public DateTime ToUtc(DateTime value)
	{
		return DateExtensions.ToUtc(value, TimeZone);
	}

	public DateTimeOffset ToUtc(DateTimeOffset value)
	{
		return DateExtensions.ToUtc(value, TimeZone);
	}
}