using System.Diagnostics;
using System.Runtime.InteropServices;

namespace CommIpc;

public static class PipeName
{
    /// <summary>
    /// Creates a pipe name that is unique per parent process instance and child id.
    /// </summary>
    public static string ForChild(int childId, int? parentPid = null)
    {
        parentPid ??= Environment.ProcessId;
        return $"CommTester_{parentPid}_{childId}";
    }

    /// <summary>
    /// Returns the full pipe path for the current platform.
    /// Windows: \\.\pipe\{pipeName}
    /// Unix/macOS: /tmp/CoreFxPipe_{pipeName}
    /// </summary>
    public static string Describe(string pipeName) =>
        RuntimeInformation.IsOSPlatform(OSPlatform.Windows) ? $"\\\\.\\pipe\\{pipeName}" : $"/tmp/CoreFxPipe_{pipeName}";
}