#include <stdio.h>
#include <winpr/crt.h>
#include <winpr/pipe.h>
#include <winpr/file.h>
#include <winpr/tchar.h>
#include <winpr/winpr.h>
#include <winpr/wlog.h>
#include <winpr/print.h>
#include <winpr/synch.h>
#include <winpr/thread.h>

#define PIPE_BUFFER_SIZE 32
#define PIPE_TIMEOUT_MS 20000 // 20 seconds

static BYTE SERVER_MESSAGE[PIPE_BUFFER_SIZE];
static BYTE CLIENT_MESSAGE[PIPE_BUFFER_SIZE];

static BOOL bClientSuccess = FALSE;
static BOOL bServerSuccess = FALSE;

static HANDLE serverReadyEvent;

static LPTSTR lpszPipeName = _T("\\\\.\\pipe\\winpr_test_pipe_overlapped");

static DWORD WINAPI named_pipe_client_thread(LPVOID arg)
{
	DWORD status;
	HANDLE hEvent = NULL;
	HANDLE hNamedPipe = NULL;
	BYTE* lpReadBuffer = NULL;
	BOOL fSuccess = FALSE;
	OVERLAPPED overlapped;
	DWORD nNumberOfBytesToRead;
	DWORD nNumberOfBytesToWrite;
	DWORD NumberOfBytesTransferred;

	status = WaitForSingleObject(serverReadyEvent, PIPE_TIMEOUT_MS);
	if (status != WAIT_OBJECT_0)
	{
		printf("client: failed to wait for server ready event: %" PRIu32 "\n", status);
		goto finish;
	}

	/* 1: initialize overlapped structure */

	ZeroMemory(&overlapped, sizeof(OVERLAPPED));
	if (!(hEvent = CreateEvent(NULL, TRUE, FALSE, NULL)))
	{
		printf("client: CreateEvent failure: %" PRIu32 "\n", GetLastError());
		goto finish;
	}
	overlapped.hEvent = hEvent;

	/* 2: connect to server named pipe */

	hNamedPipe = CreateFile(lpszPipeName, GENERIC_READ | GENERIC_WRITE, 0, NULL, OPEN_EXISTING,
	                        FILE_FLAG_OVERLAPPED, NULL);

	if (hNamedPipe == INVALID_HANDLE_VALUE)
	{
		printf("client: Named Pipe CreateFile failure: %" PRIu32 "\n", GetLastError());
		goto finish;
	}

	/* 3: write to named pipe */

	nNumberOfBytesToWrite = PIPE_BUFFER_SIZE;
	NumberOfBytesTransferred = 0;

	fSuccess = WriteFile(hNamedPipe, CLIENT_MESSAGE, nNumberOfBytesToWrite, NULL, &overlapped);

	if (!fSuccess)
		fSuccess = (GetLastError() == ERROR_IO_PENDING);

	if (!fSuccess)
	{
		printf("client: NamedPipe WriteFile failure (initial): %" PRIu32 "\n", GetLastError());
		goto finish;
	}

	status = WaitForSingleObject(hEvent, PIPE_TIMEOUT_MS);
	if (status != WAIT_OBJECT_0)
	{
		printf("client: failed to wait for overlapped event (write): %" PRIu32 "\n", status);
		goto finish;
	}

	fSuccess = GetOverlappedResult(hNamedPipe, &overlapped, &NumberOfBytesTransferred, FALSE);
	if (!fSuccess)
	{
		printf("client: NamedPipe WriteFile failure (final): %" PRIu32 "\n", GetLastError());
		goto finish;
	}
	printf("client: WriteFile transferred %" PRIu32 " bytes:\n", NumberOfBytesTransferred);

	/* 4: read from named pipe */

	if (!(lpReadBuffer = (BYTE*)calloc(1, PIPE_BUFFER_SIZE)))
	{
		printf("client: Error allocating read buffer\n");
		goto finish;
	}

	nNumberOfBytesToRead = PIPE_BUFFER_SIZE;
	NumberOfBytesTransferred = 0;

	fSuccess = ReadFile(hNamedPipe, lpReadBuffer, nNumberOfBytesToRead, NULL, &overlapped);

	if (!fSuccess)
		fSuccess = (GetLastError() == ERROR_IO_PENDING);

	if (!fSuccess)
	{
		printf("client: NamedPipe ReadFile failure (initial): %" PRIu32 "\n", GetLastError());
		goto finish;
	}

	status = WaitForMultipleObjects(1, &hEvent, FALSE, PIPE_TIMEOUT_MS);
	if (status != WAIT_OBJECT_0)
	{
		printf("client: failed to wait for overlapped event (read): %" PRIu32 "\n", status);
		goto finish;
	}

	fSuccess = GetOverlappedResult(hNamedPipe, &overlapped, &NumberOfBytesTransferred, TRUE);
	if (!fSuccess)
	{
		printf("client: NamedPipe ReadFile failure (final): %" PRIu32 "\n", GetLastError());
		goto finish;
	}

	printf("client: ReadFile transferred %" PRIu32 " bytes:\n", NumberOfBytesTransferred);
	winpr_HexDump("pipe.test", WLOG_DEBUG, lpReadBuffer, NumberOfBytesTransferred);

	if (NumberOfBytesTransferred != PIPE_BUFFER_SIZE ||
	    memcmp(lpReadBuffer, SERVER_MESSAGE, PIPE_BUFFER_SIZE))
	{
		printf("client: received unexpected data from server\n");
		goto finish;
	}

	printf("client: finished successfully\n");
	bClientSuccess = TRUE;

finish:
	free(lpReadBuffer);
	if (hNamedPipe)
		CloseHandle(hNamedPipe);
	if (hEvent)
		CloseHandle(hEvent);

	return 0;
}

static DWORD WINAPI named_pipe_server_thread(LPVOID arg)
{
	DWORD status;
	HANDLE hEvent = NULL;
	HANDLE hNamedPipe = NULL;
	BYTE* lpReadBuffer = NULL;
	OVERLAPPED overlapped;
	BOOL fSuccess = FALSE;
	BOOL fConnected = FALSE;
	DWORD nNumberOfBytesToRead;
	DWORD nNumberOfBytesToWrite;
	DWORD NumberOfBytesTransferred;

	/* 1: initialize overlapped structure */

	ZeroMemory(&overlapped, sizeof(OVERLAPPED));
	if (!(hEvent = CreateEvent(NULL, TRUE, FALSE, NULL)))
	{
		printf("server: CreateEvent failure: %" PRIu32 "\n", GetLastError());
		SetEvent(serverReadyEvent); /* unblock client thread */
		goto finish;
	}
	overlapped.hEvent = hEvent;

	/* 2: create named pipe and set ready event */

	hNamedPipe =
	    CreateNamedPipe(lpszPipeName, PIPE_ACCESS_DUPLEX | FILE_FLAG_OVERLAPPED,
	                    PIPE_TYPE_BYTE | PIPE_READMODE_BYTE | PIPE_WAIT, PIPE_UNLIMITED_INSTANCES,
	                    PIPE_BUFFER_SIZE, PIPE_BUFFER_SIZE, 0, NULL);

	if (hNamedPipe == INVALID_HANDLE_VALUE)
	{
		printf("server: CreateNamedPipe failure: %" PRIu32 "\n", GetLastError());
		SetEvent(serverReadyEvent); /* unblock client thread */
		goto finish;
	}

	SetEvent(serverReadyEvent);

	/* 3: connect named pipe */

#if 0
	/* This sleep will most certainly cause ERROR_PIPE_CONNECTED below */
	Sleep(2000);
#endif

	fConnected = ConnectNamedPipe(hNamedPipe, &overlapped);
	status = GetLastError();

	/**
	 * At this point if fConnected is FALSE, we have to check GetLastError() for:
	 * ERROR_PIPE_CONNECTED:
	 *     client has already connected before we have called ConnectNamedPipe.
	 *     this is quite common depending on the timings and indicates success
	 * ERROR_IO_PENDING:
	 *     Since we're using ConnectNamedPipe asynchronously here, the function returns
	 *     immediately and this error code simply indicates that the operation is
	 *     still in progress. Hence we have to wait for the completion event and use
	 *     GetOverlappedResult to query the actual result of the operation (note that
	 *     the lpNumberOfBytesTransferred parameter is undefined/useless for a
	 *     ConnectNamedPipe operation)
	 */

	if (!fConnected)
		fConnected = (status == ERROR_PIPE_CONNECTED);

	printf("server: ConnectNamedPipe status: %" PRIu32 "\n", status);

	if (!fConnected && status == ERROR_IO_PENDING)
	{
		DWORD dwDummy;
		printf("server: waiting up to %u ms for connection ...\n", PIPE_TIMEOUT_MS);
		status = WaitForSingleObject(hEvent, PIPE_TIMEOUT_MS);
		if (status == WAIT_OBJECT_0)
			fConnected = GetOverlappedResult(hNamedPipe, &overlapped, &dwDummy, FALSE);
		else
			printf("server: failed to wait for overlapped event (connect): %" PRIu32 "\n", status);
	}

	if (!fConnected)
	{
		printf("server: ConnectNamedPipe failed: %" PRIu32 "\n", status);
		goto finish;
	}

	printf("server: named pipe successfully connected\n");

	/* 4: read from named pipe */

	if (!(lpReadBuffer = (BYTE*)calloc(1, PIPE_BUFFER_SIZE)))
	{
		printf("server: Error allocating read buffer\n");
		goto finish;
	}

	nNumberOfBytesToRead = PIPE_BUFFER_SIZE;
	NumberOfBytesTransferred = 0;

	fSuccess = ReadFile(hNamedPipe, lpReadBuffer, nNumberOfBytesToRead, NULL, &overlapped);

	if (!fSuccess)
		fSuccess = (GetLastError() == ERROR_IO_PENDING);

	if (!fSuccess)
	{
		printf("server: NamedPipe ReadFile failure (initial): %" PRIu32 "\n", GetLastError());
		goto finish;
	}

	status = WaitForSingleObject(hEvent, PIPE_TIMEOUT_MS);
	if (status != WAIT_OBJECT_0)
	{
		printf("server: failed to wait for overlapped event (read): %" PRIu32 "\n", status);
		goto finish;
	}

	fSuccess = GetOverlappedResult(hNamedPipe, &overlapped, &NumberOfBytesTransferred, FALSE);
	if (!fSuccess)
	{
		printf("server: NamedPipe ReadFile failure (final): %" PRIu32 "\n", GetLastError());
		goto finish;
	}

	printf("server: ReadFile transferred %" PRIu32 " bytes:\n", NumberOfBytesTransferred);
	winpr_HexDump("pipe.test", WLOG_DEBUG, lpReadBuffer, NumberOfBytesTransferred);

	if (NumberOfBytesTransferred != PIPE_BUFFER_SIZE ||
	    memcmp(lpReadBuffer, CLIENT_MESSAGE, PIPE_BUFFER_SIZE))
	{
		printf("server: received unexpected data from client\n");
		goto finish;
	}

	/* 5: write to named pipe */

	nNumberOfBytesToWrite = PIPE_BUFFER_SIZE;
	NumberOfBytesTransferred = 0;

	fSuccess = WriteFile(hNamedPipe, SERVER_MESSAGE, nNumberOfBytesToWrite, NULL, &overlapped);

	if (!fSuccess)
		fSuccess = (GetLastError() == ERROR_IO_PENDING);

	if (!fSuccess)
	{
		printf("server: NamedPipe WriteFile failure (initial): %" PRIu32 "\n", GetLastError());
		goto finish;
	}

	status = WaitForSingleObject(hEvent, PIPE_TIMEOUT_MS);
	if (status != WAIT_OBJECT_0)
	{
		printf("server: failed to wait for overlapped event (write): %" PRIu32 "\n", status);
		goto finish;
	}

	fSuccess = GetOverlappedResult(hNamedPipe, &overlapped, &NumberOfBytesTransferred, FALSE);
	if (!fSuccess)
	{
		printf("server: NamedPipe WriteFile failure (final): %" PRIu32 "\n", GetLastError());
		goto finish;
	}

	printf("server: WriteFile transferred %" PRIu32 " bytes:\n", NumberOfBytesTransferred);
	// winpr_HexDump("pipe.test", WLOG_DEBUG, lpWriteBuffer, NumberOfBytesTransferred);

	bServerSuccess = TRUE;
	printf("server: finished successfully\n");

finish:
	CloseHandle(hNamedPipe);
	CloseHandle(hEvent);
	free(lpReadBuffer);
	return 0;
}

int TestPipeCreateNamedPipeOverlapped(int argc, char* argv[])
{
	HANDLE ClientThread;
	HANDLE ServerThread;
	int result = -1;

	FillMemory(SERVER_MESSAGE, PIPE_BUFFER_SIZE, 0xAA);
	FillMemory(CLIENT_MESSAGE, PIPE_BUFFER_SIZE, 0xBB);

	if (!(serverReadyEvent = CreateEvent(NULL, TRUE, FALSE, NULL)))
	{
		printf("CreateEvent failed: %" PRIu32 "\n", GetLastError());
		goto out;
	}
	if (!(ClientThread = CreateThread(NULL, 0, named_pipe_client_thread, NULL, 0, NULL)))
	{
		printf("CreateThread (client) failed: %" PRIu32 "\n", GetLastError());
		goto out;
	}
	if (!(ServerThread = CreateThread(NULL, 0, (LPTHREAD_START_ROUTINE)named_pipe_server_thread,
	                                  NULL, 0, NULL)))
	{
		printf("CreateThread (server) failed: %" PRIu32 "\n", GetLastError());
		goto out;
	}

	if (WAIT_OBJECT_0 != WaitForSingleObject(ClientThread, INFINITE))
	{
		printf("%s: Failed to wait for client thread: %" PRIu32 "\n", __FUNCTION__, GetLastError());
		goto out;
	}
	if (WAIT_OBJECT_0 != WaitForSingleObject(ServerThread, INFINITE))
	{
		printf("%s: Failed to wait for server thread: %" PRIu32 "\n", __FUNCTION__, GetLastError());
		goto out;
	}

	if (bClientSuccess && bServerSuccess)
		result = 0;

out:

#ifndef _WIN32
	if (result == 0)
	{
		printf("%s: Error, this test is currently expected not to succeed on this platform.\n",
		       __FUNCTION__);
		result = -1;
	}
	else
	{
		printf("%s: This test is currently expected to fail on this platform.\n", __FUNCTION__);
		result = 0;
	}
#endif

	return result;
}