using System.Security.Cryptography;
using System.Text;
using System.Runtime.InteropServices;

namespace IronLicensing.Client;

public partial class MachineIdentifier : IMachineIdentifier
{
    public string GetMachineId()
    {
        var components = GetMachineComponents();
        var combined = string.Join("|", components.Where(c => !string.IsNullOrEmpty(c)));

        if (string.IsNullOrEmpty(combined))
        {
#if MAUI
            // Fallback to a device-specific identifier (MAUI platforms)
            combined = DeviceInfo.Current.Idiom.ToString() + "|" +
                       DeviceInfo.Current.Manufacturer + "|" +
                       DeviceInfo.Current.Model;
#else
            // Fallback for server/console apps
            combined = Environment.MachineName + "|" +
                       Environment.UserName + "|" +
                       RuntimeInformation.OSDescription;
#endif
        }

        using var sha256 = SHA256.Create();
        var hash = sha256.ComputeHash(Encoding.UTF8.GetBytes(combined));
        return Convert.ToBase64String(hash)[..32];
    }

    public string GetMachineName()
    {
#if MAUI
        return DeviceInfo.Current.Name ?? Environment.MachineName ?? "Unknown";
#else
        return Environment.MachineName ?? "Unknown";
#endif
    }

    public string GetPlatform()
    {
#if MAUI
        return DeviceInfo.Current.Platform.ToString();
#else
        if (RuntimeInformation.IsOSPlatform(OSPlatform.Windows))
            return "Windows";
        if (RuntimeInformation.IsOSPlatform(OSPlatform.OSX))
            return "macOS";
        if (RuntimeInformation.IsOSPlatform(OSPlatform.Linux))
            return "Linux";
        return RuntimeInformation.OSDescription;
#endif
    }

    // Platform-specific implementation
    private partial List<string> GetMachineComponents();
}