using Microsoft.AspNetCore.Components.Authorization;
using System.Linq;
using System.Security.Claims;

public class AuthUtil
{
	public static string ExtractFullName(AuthenticationState authState)
	{
		var surnameClaim = authState.User.Claims.FirstOrDefault(c => c.Type.Equals(ClaimTypes.Surname));
		var givenNameClaim = authState.User.Claims.FirstOrDefault(c => c.Type.Equals(ClaimTypes.GivenName));

		var surname = string.Empty;
		if (!string.IsNullOrWhiteSpace(surnameClaim?.Value))
		{
			surname = surnameClaim.Value;
		}

		var givenName = string.Empty;
		if (!string.IsNullOrWhiteSpace(givenNameClaim?.Value))
		{
			givenName = givenNameClaim.Value;
		}

		var fullName = string.Empty;
		if (!string.IsNullOrWhiteSpace(surname) && !string.IsNullOrWhiteSpace(givenName))
		{
			fullName = $"{surname} {givenName}";
		}

		if (string.IsNullOrWhiteSpace(fullName))
		{

			fullName = "unknown(default)";

			//
			// Now try to get preferred_username (Azure AD Global provides preferred_username)
			//
			var preferredNameClaim = authState.User.Claims.FirstOrDefault(c => c.Type.Equals("preferred_username"));
			if (!string.IsNullOrWhiteSpace(preferredNameClaim?.Value))
			{
				fullName = preferredNameClaim.Value;
			}
		}

		return fullName;
	}

	public static string ExtractEmailAddress(AuthenticationState authState)
	{
		var emailClaim = authState.User.Claims.FirstOrDefault(c => c.Type.Equals(ClaimTypes.Email));

		var emailAddress = string.Empty;
		if (!string.IsNullOrWhiteSpace(emailClaim?.Value))
		{
			emailAddress = emailClaim.Value;
		}

		if (string.IsNullOrWhiteSpace(emailAddress))
		{
			emailAddress = "xyz@abc.com(default)";

			//
			// Now try to get upn (upn might be email address)
			//
			var upnClaim = authState.User.Claims.FirstOrDefault(c => c.Type.Equals(ClaimTypes.Upn));
			if (!string.IsNullOrWhiteSpace(upnClaim?.Value))
			{
				emailAddress = upnClaim.Value;
			}
		}

		return emailAddress;
	}
}