/**
 * FreeRDP: A Remote Desktop Protocol Client
 * FreeRDP Windows Server
 *
 * Copyright 2012 Corey Clayton <can.of.tuna@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 <stdlib.h>

#include <freerdp/build-config.h>

#include <winpr/tchar.h>
#include <winpr/windows.h>

#include "wf_info.h"
#include "wf_update.h"
#include "wf_mirage.h"
#include "wf_dxgi.h"

#include <freerdp/log.h>
#define TAG SERVER_TAG("windows")

#define SERVER_KEY "Software\\" FREERDP_VENDOR_STRING "\\" FREERDP_PRODUCT_STRING "\\Server"

static wfInfo* wfInfoInstance = nullptr;
static int _IDcount = 0;

BOOL wf_info_lock(wfInfo* wfi)
{
	DWORD dRes;
	dRes = WaitForSingleObject(wfi->mutex, INFINITE);

	switch (dRes)
	{
		case WAIT_ABANDONED:
		case WAIT_OBJECT_0:
			return TRUE;

		case WAIT_TIMEOUT:
			return FALSE;

		case WAIT_FAILED:
			WLog_ERR(TAG, "wf_info_lock failed with 0x%08lX", GetLastError());
			return FALSE;
	}

	return FALSE;
}

BOOL wf_info_try_lock(wfInfo* wfi, DWORD dwMilliseconds)
{
	DWORD dRes;
	dRes = WaitForSingleObject(wfi->mutex, dwMilliseconds);

	switch (dRes)
	{
		case WAIT_ABANDONED:
		case WAIT_OBJECT_0:
			return TRUE;

		case WAIT_TIMEOUT:
			return FALSE;

		case WAIT_FAILED:
			WLog_ERR(TAG, "wf_info_try_lock failed with 0x%08lX", GetLastError());
			return FALSE;
	}

	return FALSE;
}

BOOL wf_info_unlock(wfInfo* wfi)
{
	if (!ReleaseMutex(wfi->mutex))
	{
		WLog_ERR(TAG, "wf_info_unlock failed with 0x%08lX", GetLastError());
		return FALSE;
	}

	return TRUE;
}

wfInfo* wf_info_init()
{
	wfInfo* wfi;
	wfi = (wfInfo*)calloc(1, sizeof(wfInfo));

	if (wfi != nullptr)
	{
		HKEY hKey;
		LONG status;
		DWORD dwType;
		DWORD dwSize;
		DWORD dwValue;
		wfi->mutex = CreateMutex(nullptr, FALSE, nullptr);

		if (wfi->mutex == nullptr)
		{
			WLog_ERR(TAG, "CreateMutex error: %lu", GetLastError());
			free(wfi);
			return nullptr;
		}

		wfi->updateSemaphore = CreateSemaphore(nullptr, 0, 32, nullptr);

		if (!wfi->updateSemaphore)
		{
			WLog_ERR(TAG, "CreateSemaphore error: %lu", GetLastError());
			(void)CloseHandle(wfi->mutex);
			free(wfi);
			return nullptr;
		}

		wfi->updateThread =
		    CreateThread(nullptr, 0, wf_update_thread, wfi, CREATE_SUSPENDED, nullptr);

		if (!wfi->updateThread)
		{
			WLog_ERR(TAG, "Failed to create update thread");
			(void)CloseHandle(wfi->mutex);
			(void)CloseHandle(wfi->updateSemaphore);
			free(wfi);
			return nullptr;
		}

		wfi->peers =
		    (freerdp_peer**)calloc(FREERDP_SERVER_WIN_INFO_MAXPEERS, sizeof(freerdp_peer*));

		if (!wfi->peers)
		{
			WLog_ERR(TAG, "Failed to allocate memory for peer");
			(void)CloseHandle(wfi->mutex);
			(void)CloseHandle(wfi->updateSemaphore);
			(void)CloseHandle(wfi->updateThread);
			free(wfi);
			return nullptr;
		}

		// Set FPS
		wfi->framesPerSecond = FREERDP_SERVER_WIN_INFO_DEFAULT_FPS;
		status =
		    RegOpenKeyExA(HKEY_LOCAL_MACHINE, SERVER_KEY, 0, KEY_READ | KEY_WOW64_64KEY, &hKey);

		if (status == ERROR_SUCCESS)
		{
			if (RegQueryValueEx(hKey, _T("FramesPerSecond"), nullptr, &dwType, (BYTE*)&dwValue,
			                    &dwSize) == ERROR_SUCCESS)
				wfi->framesPerSecond = dwValue;
		}

		RegCloseKey(hKey);
		// Set input toggle
		wfi->input_disabled = FALSE;
		status =
		    RegOpenKeyExA(HKEY_LOCAL_MACHINE, SERVER_KEY, 0, KEY_READ | KEY_WOW64_64KEY, &hKey);

		if (status == ERROR_SUCCESS)
		{
			if (RegQueryValueEx(hKey, _T("DisableInput"), nullptr, &dwType, (BYTE*)&dwValue,
			                    &dwSize) == ERROR_SUCCESS)
			{
				if (dwValue != 0)
					wfi->input_disabled = TRUE;
			}
		}

		RegCloseKey(hKey);
	}

	return wfi;
}

wfInfo* wf_info_get_instance()
{
	if (wfInfoInstance == nullptr)
		wfInfoInstance = wf_info_init();

	return wfInfoInstance;
}

BOOL wf_info_peer_register(wfInfo* wfi, wfPeerContext* context)
{
	int peerId = 0;

	if (!wfi || !context)
		return FALSE;

	if (!wf_info_lock(wfi))
		return FALSE;

	if (wfi->peerCount == FREERDP_SERVER_WIN_INFO_MAXPEERS)
		goto fail_peer_count;

	context->info = wfi;

	if (!(context->updateEvent = CreateEvent(nullptr, TRUE, FALSE, nullptr)))
		goto fail_update_event;

	// get the offset of the top left corner of selected screen
	EnumDisplayMonitors(nullptr, nullptr, wf_info_monEnumCB, 0);
	_IDcount = 0;
#ifdef WITH_DXGI_1_2

	if (wfi->peerCount == 0)
		if (wf_dxgi_init(wfi) != 0)
			goto fail_driver_init;

#else

	if (!wf_mirror_driver_activate(wfi))
		goto fail_driver_init;

#endif

	// look through the array of peers until an empty slot
	for (int i = 0; i < FREERDP_SERVER_WIN_INFO_MAXPEERS; ++i)
	{
		// empty index will be our peer id
		if (wfi->peers[i] == nullptr)
		{
			peerId = i;
			break;
		}
	}

	wfi->peers[peerId] = ((rdpContext*)context)->peer;
	wfi->peers[peerId]->pId = peerId;
	wfi->peerCount++;
	WLog_INFO(TAG, "Registering Peer: id=%d #=%d", peerId, wfi->peerCount);
	wf_info_unlock(wfi);
	wfreerdp_server_peer_callback_event(peerId, FREERDP_SERVER_WIN_SRV_CALLBACK_EVENT_CONNECT);
	return TRUE;
fail_driver_init:
	(void)CloseHandle(context->updateEvent);
	context->updateEvent = nullptr;
fail_update_event:
fail_peer_count:
	context->socketClose = TRUE;
	wf_info_unlock(wfi);
	return FALSE;
}

void wf_info_peer_unregister(wfInfo* wfi, wfPeerContext* context)
{
	if (wf_info_lock(wfi))
	{
		int peerId;
		peerId = ((rdpContext*)context)->peer->pId;
		wfi->peers[peerId] = nullptr;
		wfi->peerCount--;
		(void)CloseHandle(context->updateEvent);
		WLog_INFO(TAG, "Unregistering Peer: id=%d, #=%d", peerId, wfi->peerCount);
#ifdef WITH_DXGI_1_2

		if (wfi->peerCount == 0)
			wf_dxgi_cleanup(wfi);

#endif
		wf_info_unlock(wfi);
		wfreerdp_server_peer_callback_event(peerId,
		                                    FREERDP_SERVER_WIN_SRV_CALLBACK_EVENT_DISCONNECT);
	}
}

BOOL wf_info_have_updates(wfInfo* wfi)
{
#ifdef WITH_DXGI_1_2

	if (wfi->framesWaiting == 0)
		return FALSE;

#else

	if (wfi->nextUpdate == wfi->lastUpdate)
		return FALSE;

#endif
	return TRUE;
}

void wf_info_update_changes(wfInfo* wfi)
{
#ifdef WITH_DXGI_1_2
	wf_dxgi_nextFrame(wfi, wfi->framesPerSecond * 1000);
#else
	GETCHANGESBUF* buf;
	buf = (GETCHANGESBUF*)wfi->changeBuffer;
	wfi->nextUpdate = buf->buffer->counter;
#endif
}

void wf_info_find_invalid_region(wfInfo* wfi)
{
#ifdef WITH_DXGI_1_2
	wf_dxgi_getInvalidRegion(&wfi->invalid);
#else
	GETCHANGESBUF* buf;
	buf = (GETCHANGESBUF*)wfi->changeBuffer;

	for (ULONG i = wfi->lastUpdate; i != wfi->nextUpdate; i = (i + 1) % MAXCHANGES_BUF)
	{
		LPRECT lpR = &buf->buffer->pointrect[i].rect;

		// need to make sure we only get updates from the selected screen
		if ((lpR->left >= wfi->servscreen_xoffset) &&
		    (lpR->right <= (wfi->servscreen_xoffset + wfi->servscreen_width)) &&
		    (lpR->top >= wfi->servscreen_yoffset) &&
		    (lpR->bottom <= (wfi->servscreen_yoffset + wfi->servscreen_height)))
		{
			UnionRect(&wfi->invalid, &wfi->invalid, lpR);
		}
		else
		{
			continue;
		}
	}

#endif

	if (wfi->invalid.left < 0)
		wfi->invalid.left = 0;

	if (wfi->invalid.top < 0)
		wfi->invalid.top = 0;

	if (wfi->invalid.right >= wfi->servscreen_width)
		wfi->invalid.right = wfi->servscreen_width - 1;

	if (wfi->invalid.bottom >= wfi->servscreen_height)
		wfi->invalid.bottom = wfi->servscreen_height - 1;

	// WLog_DBG(TAG, "invalid region: (%"PRId32", %"PRId32"), (%"PRId32", %"PRId32")",
	// wfi->invalid.left, wfi->invalid.top, wfi->invalid.right, wfi->invalid.bottom);
}

void wf_info_clear_invalid_region(wfInfo* wfi)
{
	wfi->lastUpdate = wfi->nextUpdate;
	SetRectEmpty(&wfi->invalid);
}

void wf_info_invalidate_full_screen(wfInfo* wfi)
{
	SetRect(&wfi->invalid, 0, 0, wfi->servscreen_width, wfi->servscreen_height);
}

BOOL wf_info_have_invalid_region(wfInfo* wfi)
{
	return IsRectEmpty(&wfi->invalid);
}

void wf_info_getScreenData(wfInfo* wfi, long* width, long* height, BYTE** pBits, int* pitch)
{
	*width = (wfi->invalid.right - wfi->invalid.left);
	*height = (wfi->invalid.bottom - wfi->invalid.top);
#ifdef WITH_DXGI_1_2
	wf_dxgi_getPixelData(wfi, pBits, pitch, &wfi->invalid);
#else
	{
		long offset;
		GETCHANGESBUF* changes;
		changes = (GETCHANGESBUF*)wfi->changeBuffer;
		*width += 1;
		*height += 1;
		offset = (4 * wfi->invalid.left) + (wfi->invalid.top * wfi->virtscreen_width * 4);
		*pBits = ((BYTE*)(changes->Userbuffer)) + offset;
		*pitch = wfi->virtscreen_width * 4;
	}
#endif
}

BOOL CALLBACK wf_info_monEnumCB(HMONITOR hMonitor, HDC hdcMonitor, LPRECT lprcMonitor,
                                LPARAM dwData)
{
	wfInfo* wfi;
	wfi = wf_info_get_instance();

	if (!wfi)
		return FALSE;

	if (_IDcount == wfi->screenID)
	{
		wfi->servscreen_xoffset = lprcMonitor->left;
		wfi->servscreen_yoffset = lprcMonitor->top;
	}

	_IDcount++;
	return TRUE;
}
