// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.

#if NET
using System.Runtime.Versioning;
#endif

using System.Security.Principal;

namespace Microsoft.DotNet.Cli.Utils;

/// <summary>
/// Utility methods, specific to Windows.
/// </summary>
#if NET
[SupportedOSPlatform("windows")]
#endif
public static class Windows
{
    /// <summary>
    /// Determines whether the current user has the Administrator role.
    /// </summary>
    /// <returns><see langword="true"/> if the user has the Administrator role.</returns>
    public static bool IsAdministrator() =>
        new WindowsPrincipal(WindowsIdentity.GetCurrent()).IsInRole(WindowsBuiltInRole.Administrator);

    /// <summary>
    /// Determine if an install is running by trying to open the global _MSIExecute mutex. The mutex is
    /// only set while processing the InstallExecuteSequence, AdminExecuteSequence or AdvtExecuteSequence tables.
    /// </summary>
    /// <returns><see langword="true" /> if another install is already running; <see langword="false"/> otherwise.</returns>
    /// See the <see href="https://docs.microsoft.com/en-us/windows/win32/msi/-msiexecute-mutex">_MSIMutex</see> documentation.
    public static bool InstallRunning() =>
        !Mutex.TryOpenExisting(@"Global\_MSIExecute", out _);

    /// <summary>
    /// Returns the commandline of the currently executing process.
    /// </summary>
    /// <returns>The commandline of the current process.</returns>
    public static string? GetProcessCommandLine()
    {
#if TARGET_WINDOWS
        // Windows manages the lifetime of the returned PWSTR, so we don't need to free it.
        return PInvoke.GetCommandLine().ToString();
#else
        return null;
#endif
    }
}