using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;
using System.Threading.Tasks;

namespace TestList
{
    internal static class LgLcd
    {
        public delegate int OnConfigureDelegate(int connection, IntPtr pContext);

        public delegate int OnSoftButtonsDelegate(int device, int dwButtons, IntPtr pContext);

        public const int InvalidConnection = -1;
        public const int InvalidDevice = -1;
        public const uint ButtonButton0 = 0x00000001;
        public const uint ButtonButton1 = 0x00000002;
        public const uint ButtonButton2 = 0x00000004;
        public const uint ButtonButton3 = 0x00000008;
        public const uint BitmapFormat160X43X1 = 0x00000001;
        public const uint BitmapWidth = 160;
        public const uint BitmapHeight = 43;
        public const uint PriorityIdleNoShow = 0;
        public const uint PriorityBackground = 64;
        public const uint PriorityNormal = 128;
        public const uint PriorityAlert = 255;

        [DllImport("LgLcd.dll", EntryPoint = "lgLcdInit")]
        public static extern int Init();

        [DllImport("LgLcd.dll", EntryPoint = "lgLcdDeInit")]
        public static extern int DeInit();

        [DllImport("LgLcd.dll", EntryPoint = "lgLcdConnect")]
        public static extern int Connect(ref ConnectContext ctx);

        [DllImport("LgLcd.dll", EntryPoint = "lgLcdDisconnect")]
        public static extern int Disconnect(int connection);

        [DllImport("LgLcd.dll", EntryPoint = "lgLcdEnumerate")]
        public static extern int Enumerate(int connection, int index, out DeviceDescription description);

        [DllImport("LgLcd.dll", EntryPoint = "lgLcdOpen")]
        public static extern int Open(ref OpenContext ctx);

        [DllImport("LgLcd.dll", EntryPoint = "lgLcdClose")]
        public static extern int Close(int device);

        [DllImport("LgLcd.dll", EntryPoint = "lgLcdReadSoftButtons")]
        public static extern int ReadSoftButtons(int device, out int buttons);

        [DllImport("LgLcd.dll", EntryPoint = "lgLcdUpdateBitmap")]
        public static extern int UpdateBitmap(int device, ref Bitmap160X43X1 bitmap, uint priority);

        [DllImport("LgLcd.dll", EntryPoint = "lgLcdSetAsLCDForegroundApp")]
        public static extern int SetAsLCDForegroundApp(int device, int toggle);

        [StructLayout(LayoutKind.Sequential)]
        public struct Bitmap160X43X1
        {
            public BitmapHeader Header;
            [MarshalAs(UnmanagedType.ByValArray, SizeConst = 6880)]
            public byte[] Pixels;
        }

        [StructLayout(LayoutKind.Sequential)]
        public struct BitmapHeader
        {
            public uint Format;
        }

        [StructLayout(LayoutKind.Sequential)]
        public struct ConfigureContext
        {
            public OnConfigureDelegate ConfigCallback;
            public IntPtr ConfigContext;
        }

        [StructLayout(LayoutKind.Sequential)]
        public struct ConnectContext
        {
            public string AppFriendlyName;
            public bool IsPersistent;
            public bool IsAutostartable;
            public ConfigureContext OnConfigure;
            public int Connection;
        }

        [StructLayout(LayoutKind.Sequential)]
        public struct DeviceDescription
        {
            public int Width;
            public int Height;
            public int BitsPerPixel;
            public int SoftButtonsCount;
        }

        [StructLayout(LayoutKind.Sequential)]
        public struct OpenContext
        {
            public int Connection;
            public int Index;
            public SoftButtonsChangedContext OnSoftButtonsChanged;
            public int Device;
        }

        [StructLayout(LayoutKind.Sequential)]
        public struct SoftButtonsChangedContext
        {
            public OnSoftButtonsDelegate Callback;
            public IntPtr Context;
        }
    }
    class Program
    {
        static void Main(string[] args)
        {
            LgLcd.ConnectContext ctx = new LgLcd.ConnectContext();
            ctx.AppFriendlyName = "List";
            LgLcd.Init();

            var openResult = LgLcd.Connect(ref ctx);
            Console.WriteLine("Conn: {0}", ctx.Connection);

            LgLcd.DeviceDescription desc = new LgLcd.DeviceDescription();

            int i = 0;

            while (0 == LgLcd.Enumerate(ctx.Connection, i, out desc))
            {
                Console.WriteLine("{4}: {0}x{1}, bbp {2}, {3} buttons", desc.Width, desc.Height, desc.BitsPerPixel,
                    desc.SoftButtonsCount, i);

                i++;
            }

            Console.WriteLine("Detected devices: {0}", i);
            Console.ReadLine();
        }
    }
}