/*
   Copyright (c) 2010 Vic Lee

   Permission is hereby granted, free of charge, to any person obtaining a
   copy of this software and associated documentation files (the "Software"),
   to deal in the Software without restriction, including without limitation
   the rights to use, copy, modify, merge, publish, distribute, sublicense,
   and/or sell copies of the Software, and to permit persons to whom the
   Software is furnished to do so, subject to the following conditions:

   The above copyright notice and this permission notice shall be included
   in all copies or substantial portions of the Software.

   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
   OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
   AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
   LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
   FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
   DEALINGS IN THE SOFTWARE.

*/

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "drdynvc_types.h"

#define IRPDR_ID_VERSION            0x00000065
#define IRPDR_ID_REDIRECT_DEVICES   0x00000066
#define IRPDR_ID_SERVER_LOGON       0x00000067
#define IRPDR_ID_UNREDIRECT_DEVICE  0x00000068

typedef struct _PNPDR_LISTENER_CALLBACK PNPDR_LISTENER_CALLBACK;
struct _PNPDR_LISTENER_CALLBACK
{
	IWTSListenerCallback iface;

	IWTSPlugin * plugin;
	IWTSVirtualChannelManager * channel_mgr;
};

typedef struct _PNPDR_CHANNEL_CALLBACK PNPDR_CHANNEL_CALLBACK;
struct _PNPDR_CHANNEL_CALLBACK
{
	IWTSVirtualChannelCallback iface;

	IWTSPlugin * plugin;
	IWTSVirtualChannelManager * channel_mgr;
	IWTSVirtualChannel * channel;
};

typedef struct _PNPDR_PLUGIN PNPDR_PLUGIN;
struct _PNPDR_PLUGIN
{
	IWTSPlugin iface;

	PNPDR_LISTENER_CALLBACK * listener_callback;
};

static int
pnpdr_process_version(IWTSVirtualChannelCallback * pChannelCallback,
	char * data, uint32 data_size)
{
	PNPDR_CHANNEL_CALLBACK * callback = (PNPDR_CHANNEL_CALLBACK *) pChannelCallback;
	uint32 MajorVersion;
	uint32 MinorVersion;
	uint32 Capabilities;
	uint32 out_size;
	char * out_data;

	MajorVersion = GET_UINT32(data, 0);
	MinorVersion = GET_UINT32(data, 4);
	Capabilities = GET_UINT32(data, 8);
	LLOGLN(10, ("pnpdr_process_version: MajorVersion=%d MinorVersion=%d Capabilities=%d",
		MajorVersion, MinorVersion, Capabilities));

	out_size = 20;
	out_data = (char *) malloc(out_size);
	memset(out_data, 0, out_size);
	SET_UINT32(out_data, 0, out_size);
	SET_UINT32(out_data, 4, IRPDR_ID_VERSION);
	SET_UINT32(out_data, 8, MajorVersion);
	SET_UINT32(out_data, 12, MinorVersion);
	SET_UINT32(out_data, 16, Capabilities);
	callback->channel->Write(callback->channel, out_size, out_data, NULL);
	free(out_data);

	return 0;
}

static int
pnpdr_on_data_received(IWTSVirtualChannelCallback * pChannelCallback,
	uint32 cbSize,
	char * pBuffer)
{
	uint32 Size;
	uint32 PacketId;
	int error = 0;

	Size = GET_UINT32(pBuffer, 0);
	PacketId = GET_UINT32(pBuffer, 4);
	if (Size != cbSize)
	{
		LLOGLN(0, ("pnpdr_on_data_received: invalid size. cbSize=%d Size=%d", cbSize, Size));
		return 1;
	}
	LLOGLN(10, ("pnpdr_on_data_received: Size=%d PacketId=0x%X", Size, PacketId));
	switch (PacketId)
	{
		case IRPDR_ID_VERSION:
			error = pnpdr_process_version(pChannelCallback, pBuffer + 8, Size - 8);
			break;
		case IRPDR_ID_SERVER_LOGON:
			LLOGLN(10, ("pnpdr_on_data_received: IRPDR_ID_SERVER_LOGON"));
			break;
		default:
			LLOGLN(0, ("pnpdr_on_data_received: unknown PacketId 0x%X", PacketId));
			error = 1;
			break;
	}
	return error;
}

static int
pnpdr_on_close(IWTSVirtualChannelCallback * pChannelCallback)
{
	LLOGLN(10, ("pnpdr_on_close:"));
	free(pChannelCallback);
	return 0;
}

static int
pnpdr_on_new_channel_connection(IWTSListenerCallback * pListenerCallback,
	IWTSVirtualChannel * pChannel,
	char * Data,
	int * pbAccept,
	IWTSVirtualChannelCallback ** ppCallback)
{
	PNPDR_LISTENER_CALLBACK * listener_callback = (PNPDR_LISTENER_CALLBACK *) pListenerCallback;
	PNPDR_CHANNEL_CALLBACK * callback;

	LLOGLN(10, ("pnpdr_on_new_channel_connection:"));
	callback = (PNPDR_CHANNEL_CALLBACK *) malloc(sizeof(PNPDR_CHANNEL_CALLBACK));
	callback->iface.OnDataReceived = pnpdr_on_data_received;
	callback->iface.OnClose = pnpdr_on_close;
	callback->plugin = listener_callback->plugin;
	callback->channel_mgr = listener_callback->channel_mgr;
	callback->channel = pChannel;
	*ppCallback = (IWTSVirtualChannelCallback *) callback;
	return 0;
}

static int
pnpdr_plugin_initialize(IWTSPlugin * pPlugin, IWTSVirtualChannelManager * pChannelMgr)
{
	PNPDR_PLUGIN * pnpdr = (PNPDR_PLUGIN *) pPlugin;

	LLOGLN(10, ("pnpdr_plugin_initialize:"));
	pnpdr->listener_callback = (PNPDR_LISTENER_CALLBACK *) malloc(sizeof(PNPDR_LISTENER_CALLBACK));
	memset(pnpdr->listener_callback, 0, sizeof(PNPDR_LISTENER_CALLBACK));

	pnpdr->listener_callback->iface.OnNewChannelConnection = pnpdr_on_new_channel_connection;
	pnpdr->listener_callback->plugin = pPlugin;
	pnpdr->listener_callback->channel_mgr = pChannelMgr;
	return pChannelMgr->CreateListener(pChannelMgr, "PNPDR", 0,
		(IWTSListenerCallback *) pnpdr->listener_callback, NULL);
}

static int
pnpdr_plugin_terminated(IWTSPlugin * pPlugin)
{
	PNPDR_PLUGIN * pnpdr = (PNPDR_PLUGIN *) pPlugin;

	LLOGLN(10, ("pnpdr_plugin_terminated:"));
	if (pnpdr->listener_callback)
		free(pnpdr->listener_callback);
	free(pnpdr);
	return 0;
}

int
DVCPluginEntry(IDRDYNVC_ENTRY_POINTS * pEntryPoints)
{
	PNPDR_PLUGIN * pnpdr;

	pnpdr = (PNPDR_PLUGIN *) malloc(sizeof(PNPDR_PLUGIN));
	memset(pnpdr, 0, sizeof(PNPDR_PLUGIN));

	pnpdr->iface.Initialize = pnpdr_plugin_initialize;
	pnpdr->iface.Connected = NULL;
	pnpdr->iface.Disconnected = NULL;
	pnpdr->iface.Terminated = pnpdr_plugin_terminated;
	return pEntryPoints->RegisterPlugin(pEntryPoints, (IWTSPlugin *) pnpdr);
}