/**
 * FreeRDP: A Remote Desktop Protocol Implementation
 * Device Redirection Virtual Channel
 *
 * Copyright 2010-2011 Vic Lee
 * Copyright 2010-2012 Marc-Andre Moreau <marcandre.moreau@gmail.com>
 * Copyright 2015 Thincast Technologies GmbH
 * Copyright 2015 DI (FH) Martin Haimberger <martin.haimberger@thincast.com>
 * Copyright 2016 Armin Novak <armin.novak@gmail.com>
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include <freerdp/config.h>

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

#include <winpr/crt.h>
#include <winpr/stream.h>

#include <freerdp/types.h>
#include <freerdp/addin.h>
#include <freerdp/client/channels.h>
#include <freerdp/channels/log.h>

#include "rdpdr_main.h"

#include "devman.h"

#define TAG CHANNELS_TAG("rdpdr.client")

static void devman_device_free(void* obj)
{
	DEVICE* device = (DEVICE*)obj;

	if (!device)
		return;

	if (device->Free)
		device->Free(device);
}

DEVMAN* devman_new(rdpdrPlugin* rdpdr)
{
	DEVMAN* devman = nullptr;

	if (!rdpdr)
		return nullptr;

	devman = (DEVMAN*)calloc(1, sizeof(DEVMAN));

	if (!devman)
	{
		WLog_Print(rdpdr->log, WLOG_INFO, "calloc failed!");
		return nullptr;
	}

	devman->plugin = (void*)rdpdr;
	devman->id_sequence = 1;
	devman->devices = ListDictionary_New(TRUE);

	if (!devman->devices)
	{
		WLog_Print(rdpdr->log, WLOG_INFO, "ListDictionary_New failed!");
		free(devman);
		return nullptr;
	}

	ListDictionary_ValueObject(devman->devices)->fnObjectFree = devman_device_free;
	return devman;
}

void devman_free(DEVMAN* devman)
{
	ListDictionary_Free(devman->devices);
	free(devman);
}

void devman_unregister_device(DEVMAN* devman, void* key)
{
	DEVICE* device = nullptr;

	if (!devman || !key)
		return;

	device = (DEVICE*)ListDictionary_Take(devman->devices, key);

	if (device)
		devman_device_free(device);
}

/**
 * Function description
 *
 * @return 0 on success, otherwise a Win32 error code
 */
static UINT devman_register_device(DEVMAN* devman, DEVICE* device)
{
	void* key = nullptr;

	if (!devman || !device)
		return ERROR_INVALID_PARAMETER;

	device->id = devman->id_sequence++;
	key = (void*)(size_t)device->id;

	if (!ListDictionary_Add(devman->devices, key, device))
	{
		WLog_INFO(TAG, "ListDictionary_Add failed!");
		return ERROR_INTERNAL_ERROR;
	}

	return CHANNEL_RC_OK;
}

DEVICE* devman_get_device_by_id(DEVMAN* devman, UINT32 id)
{
	DEVICE* device = nullptr;
	void* key = (void*)(size_t)id;

	if (!devman)
	{
		WLog_ERR(TAG, "device manager=nullptr");
		return nullptr;
	}

	device = (DEVICE*)ListDictionary_GetItemValue(devman->devices, key);
	if (!device)
		WLog_WARN(TAG, "could not find device ID 0x%08" PRIx32, id);
	return device;
}

DEVICE* devman_get_device_by_type(DEVMAN* devman, UINT32 type)
{
	DEVICE* device = nullptr;
	ULONG_PTR* keys = nullptr;

	if (!devman)
		return nullptr;

	ListDictionary_Lock(devman->devices);
	const size_t count = ListDictionary_GetKeys(devman->devices, &keys);

	for (size_t x = 0; x < count; x++)
	{
		DEVICE* cur = (DEVICE*)ListDictionary_GetItemValue(devman->devices, (void*)keys[x]);

		if (!cur)
			continue;

		if (cur->type != type)
			continue;

		device = cur;
		break;
	}

	free(keys);
	ListDictionary_Unlock(devman->devices);
	return device;
}

static const char DRIVE_SERVICE_NAME[] = "drive";
static const char PRINTER_SERVICE_NAME[] = "printer";
static const char SMARTCARD_SERVICE_NAME[] = "smartcard";
static const char SERIAL_SERVICE_NAME[] = "serial";
static const char PARALLEL_SERVICE_NAME[] = "parallel";

/**
 * Function description
 *
 * @return 0 on success, otherwise a Win32 error code
 */
UINT devman_load_device_service(DEVMAN* devman, RDPDR_DEVICE* device, rdpContext* rdpcontext)
{
	const char* ServiceName = nullptr;
	DEVICE_SERVICE_ENTRY_POINTS ep = WINPR_C_ARRAY_INIT;
	union
	{
		const RDPDR_DEVICE* cdp;
		RDPDR_DEVICE* dp;
	} devconv;

	devconv.cdp = device;
	if (!devman || !device || !rdpcontext)
		return ERROR_INVALID_PARAMETER;

	if (device->Type == RDPDR_DTYP_FILESYSTEM)
		ServiceName = DRIVE_SERVICE_NAME;
	else if (device->Type == RDPDR_DTYP_PRINT)
		ServiceName = PRINTER_SERVICE_NAME;
	else if (device->Type == RDPDR_DTYP_SMARTCARD)
		ServiceName = SMARTCARD_SERVICE_NAME;
	else if (device->Type == RDPDR_DTYP_SERIAL)
		ServiceName = SERIAL_SERVICE_NAME;
	else if (device->Type == RDPDR_DTYP_PARALLEL)
		ServiceName = PARALLEL_SERVICE_NAME;

	if (!ServiceName)
	{
		WLog_INFO(TAG, "ServiceName %s did not match!", ServiceName);
		return ERROR_INVALID_NAME;
	}

	if (device->Name)
		WLog_INFO(TAG, "Loading device service %s [%s] (static)", ServiceName, device->Name);
	else
		WLog_INFO(TAG, "Loading device service %s (static)", ServiceName);

	PVIRTUALCHANNELENTRY pvce =
	    freerdp_load_channel_addin_entry(ServiceName, nullptr, "DeviceServiceEntry", 0);
	PDEVICE_SERVICE_ENTRY entry = WINPR_FUNC_PTR_CAST(pvce, PDEVICE_SERVICE_ENTRY);

	if (!entry)
	{
		WLog_INFO(TAG, "freerdp_load_channel_addin_entry failed!");
		return ERROR_INTERNAL_ERROR;
	}

	ep.devman = devman;
	ep.RegisterDevice = devman_register_device;
	ep.device = devconv.dp;
	ep.rdpcontext = rdpcontext;
	return entry(&ep);
}
