using Shouldly;
using Xunit;
using ZB.MOM.WW.OtOpcUa.Client.Shared;

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

[Trait("Category", "Unit")]
public sealed class ClientStoragePathsTests
{
    /// <summary>Verifies that GetRoot returns the canonical folder name under LocalAppData.</summary>
    [Fact]
    public void GetRoot_ReturnsCanonicalFolderName_UnderLocalAppData()
    {
        var root = ClientStoragePaths.GetRoot();
        root.ShouldEndWith(ClientStoragePaths.CanonicalFolderName);
        root.ShouldContain(Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData));
    }

    /// <summary>Verifies that GetPkiPath nests PKI under root.</summary>
    [Fact]
    public void GetPkiPath_NestsPkiUnderRoot()
    {
        var pki = ClientStoragePaths.GetPkiPath();
        pki.ShouldEndWith(Path.Combine(ClientStoragePaths.CanonicalFolderName, "pki"));
    }

    /// <summary>Verifies that CanonicalFolderName is OtOpcUaClient.</summary>
    [Fact]
    public void CanonicalFolderName_IsOtOpcUaClient()
    {
        ClientStoragePaths.CanonicalFolderName.ShouldBe("OtOpcUaClient");
    }

    /// <summary>Verifies that LegacyFolderName is LmxOpcUaClient.</summary>
    [Fact]
    public void LegacyFolderName_IsLmxOpcUaClient()
    {
        // The shim depends on this specific spelling — a typo here would leak the legacy
        // folder past the migration + break every dev-box upgrade.
        ClientStoragePaths.LegacyFolderName.ShouldBe("LmxOpcUaClient");
    }

    /// <summary>Verifies that TryRunLegacyMigration returns false on repeat invocation.</summary>
    [Fact]
    public void TryRunLegacyMigration_Returns_False_On_Repeat_Invocation()
    {
        // Once the guard in-process has fired, subsequent calls short-circuit to false
        // regardless of filesystem state. This is the behaviour that keeps the migration
        // cheap on hot paths (CertificateStorePath property getter is called frequently).
        _ = ClientStoragePaths.GetRoot(); // arms the guard
        ClientStoragePaths.TryRunLegacyMigration().ShouldBeFalse();
    }
}
