using Opc.Ua;
using Shouldly;
using Xunit;
using ZB.MOM.WW.OtOpcUa.Client.Shared.Helpers;
using ZB.MOM.WW.OtOpcUa.Client.Shared.Models;

namespace ZB.MOM.WW.OtOpcUa.Client.Shared.Tests.Helpers;

public class SecurityModeMapperTests
{
    /// <summary>Verifies ToMessageSecurityMode correctly maps SecurityMode values to OPC UA MessageSecurityMode.</summary>
    /// <param name="input">The SecurityMode value to map.</param>
    /// <param name="expected">The expected MessageSecurityMode result.</param>
    [Theory]
    [InlineData(SecurityMode.None, MessageSecurityMode.None)]
    [InlineData(SecurityMode.Sign, MessageSecurityMode.Sign)]
    [InlineData(SecurityMode.SignAndEncrypt, MessageSecurityMode.SignAndEncrypt)]
    public void ToMessageSecurityMode_MapsCorrectly(SecurityMode input, MessageSecurityMode expected)
    {
        SecurityModeMapper.ToMessageSecurityMode(input).ShouldBe(expected);
    }

    /// <summary>Verifies ToMessageSecurityMode throws on invalid SecurityMode values.</summary>
    [Fact]
    public void ToMessageSecurityMode_InvalidValue_Throws()
    {
        Should.Throw<ArgumentOutOfRangeException>(() =>
            SecurityModeMapper.ToMessageSecurityMode((SecurityMode)99));
    }

    /// <summary>Verifies FromString correctly parses security mode strings (case-insensitive).</summary>
    /// <param name="input">The security mode string to parse.</param>
    /// <param name="expected">The expected SecurityMode result.</param>
    [Theory]
    [InlineData("none", SecurityMode.None)]
    [InlineData("None", SecurityMode.None)]
    [InlineData("NONE", SecurityMode.None)]
    [InlineData("sign", SecurityMode.Sign)]
    [InlineData("Sign", SecurityMode.Sign)]
    [InlineData("encrypt", SecurityMode.SignAndEncrypt)]
    [InlineData("signandencrypt", SecurityMode.SignAndEncrypt)]
    [InlineData("SignAndEncrypt", SecurityMode.SignAndEncrypt)]
    public void FromString_ParsesCorrectly(string input, SecurityMode expected)
    {
        SecurityModeMapper.FromString(input).ShouldBe(expected);
    }

    /// <summary>Verifies FromString correctly parses strings with leading and trailing whitespace.</summary>
    [Fact]
    public void FromString_WithWhitespace_ParsesCorrectly()
    {
        SecurityModeMapper.FromString("  sign  ").ShouldBe(SecurityMode.Sign);
    }

    /// <summary>Verifies FromString throws on unrecognized security mode strings.</summary>
    [Fact]
    public void FromString_UnknownValue_Throws()
    {
        Should.Throw<ArgumentException>(() => SecurityModeMapper.FromString("invalid"));
    }

    /// <summary>Verifies FromString returns None when passed a null string.</summary>
    [Fact]
    public void FromString_Null_DefaultsToNone()
    {
        SecurityModeMapper.FromString(null!).ShouldBe(SecurityMode.None);
    }
}