using System.Collections.Generic;
using Shouldly;
using Xunit;
using ZB.MOM.WW.LmxOpcUa.Host.Configuration;
using ZB.MOM.WW.LmxOpcUa.Host.Domain;

namespace ZB.MOM.WW.LmxOpcUa.Tests.Authentication
{
    public class UserAuthenticationTests
    {
        [Fact]
        public void ValidCredentials_ReturnsTrue()
        {
            var provider = new ConfigUserAuthenticationProvider(new List<UserCredential>
            {
                new UserCredential { Username = "operator", Password = "op123" }
            });

            provider.ValidateCredentials("operator", "op123").ShouldBeTrue();
        }

        [Fact]
        public void WrongPassword_ReturnsFalse()
        {
            var provider = new ConfigUserAuthenticationProvider(new List<UserCredential>
            {
                new UserCredential { Username = "operator", Password = "op123" }
            });

            provider.ValidateCredentials("operator", "wrong").ShouldBeFalse();
        }

        [Fact]
        public void UnknownUsername_ReturnsFalse()
        {
            var provider = new ConfigUserAuthenticationProvider(new List<UserCredential>
            {
                new UserCredential { Username = "operator", Password = "op123" }
            });

            provider.ValidateCredentials("unknown", "op123").ShouldBeFalse();
        }

        [Fact]
        public void Username_IsCaseInsensitive()
        {
            var provider = new ConfigUserAuthenticationProvider(new List<UserCredential>
            {
                new UserCredential { Username = "Operator", Password = "op123" }
            });

            provider.ValidateCredentials("operator", "op123").ShouldBeTrue();
            provider.ValidateCredentials("OPERATOR", "op123").ShouldBeTrue();
        }

        [Fact]
        public void EmptyUserList_RejectsAll()
        {
            var provider = new ConfigUserAuthenticationProvider(new List<UserCredential>());

            provider.ValidateCredentials("anyone", "anything").ShouldBeFalse();
        }

        [Fact]
        public void AuthenticationConfiguration_Defaults()
        {
            var config = new AuthenticationConfiguration();

            config.AllowAnonymous.ShouldBeTrue();
            config.AnonymousCanWrite.ShouldBeTrue();
            config.Users.ShouldBeEmpty();
        }
    }
}