using System;
using System.Runtime.InteropServices;

namespace Dbcc
{
    /// <summary>
    ///   Imported symbols for interop with dbcc.dll/so.
    /// </summary>
    internal class NativeInterop
    {
        // This shouldn't be needed, even on Windows
        // /// <summary>
        // /// Taken from: http://stackoverflow.com/questions/10852634/using-a-32bit-or-64bit-dll-in-c-sharp-dllimport
        // /// </summary>
        // static NativeInterop()
        // {
        //     var myPath = new Uri(typeof(NativeInterop).Assembly.CodeBase).LocalPath;
        //     var myFolder = Path.GetDirectoryName(myPath);

        //     var is64 = IntPtr.Size == 8;
        //     var subfolder = is64 ? "\\win64\\" : "\\win32\\";

        //     string dllPosition = myFolder + subfolder + "keystone.dll";

        //     // If this file exist, load it.
        //     // Otherwise let the marshaller load the appropriate file.
        //     if (File.Exists(dllPosition))
        //         LoadLibrary(dllPosition);
        // }

        // [DllImport("dbcc.dll")]
        // private static extern IntPtr LoadLibrary(string dllToLoad);

        [DllImport("dbcc", CallingConvention = CallingConvention.Cdecl, EntryPoint = "version" )]
        internal static extern uint Version(ref uint major, ref uint minor);

        [DllImport("dbcc", CallingConvention = CallingConvention.Cdecl, EntryPoint = "SignalProcessor_new")]
        internal static extern uint Create(ref IntPtr h, [MarshalAs(UnmanagedType.LPStr)] string filePath);

        [DllImport("dbcc", CallingConvention = CallingConvention.Cdecl, EntryPoint = "SignalProcessor_delete")]
        internal static extern void Dispose(IntPtr h);

        [DllImport("dbcc", CallingConvention = CallingConvention.Cdecl, EntryPoint = "SignalProcessor_encode")]
        internal static extern int Encode(IntPtr h,
            double pvs,
            [MarshalAs(UnmanagedType.LPArray)] ref byte[] data, uint length);

        [DllImport("dbcc", CallingConvention = CallingConvention.Cdecl, EntryPoint = "SignalProcessor_decode")]
        bool Decode(IntPtr h, uint msgId, [MarshalAs(UnmanagedType.LPArray)] byte[] data, uint length);
    }
}