#define _CRT_SECURE_NO_WARNINGS
#include "exercicio7.h"

#define BUFFSIZE 4098

BOOL _CreateProcess();

// child read
HANDLE Child_rd;
// father write
HANDLE Father_wr;

// father read
HANDLE Father_rd;
// father write
HANDLE Child_wr;

/* Father console read -> Father pipe write -> Child pipe read -> Child console write */

int _tmain(VOID){
	HANDLE in = GetStdHandle(STD_INPUT_HANDLE);
	HANDLE out = GetStdHandle(STD_OUTPUT_HANDLE);

	CHAR buff[BUFFSIZE];

	DWORD sizeOfRead;
	DWORD sizeOfWrite;

	OVERLAPPED isOverlapped = {0};
	isOverlapped.hEvent = CreateEvent(NULL, TRUE, FALSE, "ReadParent");

	SECURITY_ATTRIBUTES saAttr;

	// Set the bInheritHandle flag so pipe handles are inherited.

	saAttr.nLength = sizeof(SECURITY_ATTRIBUTES);
	saAttr.bInheritHandle = TRUE;
	saAttr.lpSecurityDescriptor = NULL;

	// Define the channels for the comunication to happen
	// The child should not inherit the Fathers Handles

	if (!CreatePipe(&Child_rd, &Father_wr, &saAttr, 0))
		printf("Failed to CreatePipe");

	if (!SetHandleInformation(Father_wr, HANDLE_FLAG_INHERIT, 0))
		printf("Failed to SetHandleInformation");

	if (!CreatePipe(&Father_rd, &Child_wr, &saAttr, 0))
		printf("Failed to CreatePipe");

	if (!SetHandleInformation(Father_rd, HANDLE_FLAG_INHERIT, 0))
		printf("Failed to SetHandleInformation");

	if (!_CreateProcess())
		printf("Failed to CreateProcess");

	// Comunicate

	while (true){
		ReadFile(in, buff, BUFFSIZE, &sizeOfRead, &isOverlapped);
		//WaitForSingleObject(isOverlapped.hEvent, INFINITE);
		WriteFile(Father_wr, buff, sizeOfRead, &sizeOfWrite, NULL);

		ReadFile(Father_rd, buff, BUFFSIZE, &sizeOfRead, &isOverlapped);
		//WaitForSingleObject(isOverlapped.hEvent, INFINITE);
		WriteFile(out, buff, sizeOfRead, &sizeOfWrite, NULL);
	}
}

BOOL _CreateProcess(){

	// Location of the Child executable file

	PCHAR file = "H:\\Dropbox\\LEIC\\1415i_SO\\Trabalho2\\Exemplos Windows\\Debug\\Exercicio7-Child.exe";

	// Set Process Information

	PROCESS_INFORMATION pi;

	ZeroMemory(&pi, sizeof(PROCESS_INFORMATION));

	// Set Start up information

	STARTUPINFO si;

	ZeroMemory(&si, sizeof(STARTUPINFO));

	si.cb = sizeof(STARTUPINFO);
	si.hStdError = NULL;
	//si.hStdOutput = Father_wr;
	//si.hStdInput = Child_rd;		// **
	si.dwFlags |= STARTF_USESTDHANDLES;

	// Child handles location -> String

	TCHAR cmdLineArgs[64];

	_tprintf("Child read: %p \nChild write: %p\n", Child_rd, Child_wr);

	_stprintf(cmdLineArgs, _T("Exercicio7-Child.exe %d %d"), Child_rd, Child_wr);

	_tprintf(_T("Args sent to Child Process: %s"), cmdLineArgs);

	// Create the Process - second field is for parameters

	return CreateProcess(file, cmdLineArgs, NULL, NULL, TRUE, CREATE_NEW_CONSOLE, NULL, NULL, &si, &pi);
}