#include "System.h"
//
#include <stdio.h>
//#include <process.h>
#include <errno.h>
#include <memory.h>
#include "String.h"
#ifndef WINDOWS
#include <stdlib.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>
#endif

void* System::SafeAllocMemory(UINT size)
{
	if ( 0 == size )
		return 0;
#ifdef WINDOWS
	void* result = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, size);
	return result;
#else
	void* result = malloc(size);
	if ( 0 == result)
		return 0;
	memset(result, 0, size);
	return result;
#endif
	
}

bool System::SafeFreeMemory(void* memory)
{
	if (0 == memory)
		return false;
#ifdef WINDOWS
	return HeapFree(GetProcessHeap(),0, memory);
#else
	free( memory);
	return true;
#endif

	
}
void System::ShowErrorMessage(STRING message)
{
#ifdef WINDOWS
	MessageBoxA(0, message, "Extracting error", MB_OK | MB_ICONERROR);
#else
	fprintf( stderr, "%s\n",message);
	fflush(stderr);
#endif

}

bool System::ExecuteAndWait(STRING executablePath, STRING args)
{
#ifdef WINDOWS
	STARTUPINFOA    si;
    PROCESS_INFORMATION  pi;
	GetStartupInfoA(&si);
	STRING fullCommand = (STRING)System::SafeAllocMemory(String::StrLen(executablePath) + String::StrLen(args) + 20);
	String::Sprintf2(fullCommand,"%s %s", (int)executablePath, (int)args);
	if ( 0 != CreateProcessA(0,fullCommand,0,0,false,0,0,0,&si,&pi) )
	{
		System::SafeFreeMemory(fullCommand);
		//wait it for exit
		WaitForSingleObject(pi.hProcess, 0xFFFFFFFF); //wait infinite. may be we should change it later
		//clean up
		CloseHandle(pi.hProcess);
		CloseHandle(pi.hThread);
		return true;
	}
	else
	{
		System::SafeFreeMemory(fullCommand);
		DWORD lastErr = GetLastError();
		return false;
	}

#else
	//make it executable
	STRING command = (STRING)System::SafeAllocMemory(strlen(executablePath) + 20);
	strcpy(command, "chmod +x ");
	strcat(command, executablePath);
	system(command);
	System::SafeFreeMemory(command);
	pid_t child = fork();
	if ( -1 == child)
		return false;
	if ( 0 == child )
	{
		//we are in child process
		execl(executablePath, args, NULL);
		return false; //never ever will return
	}
	else
	{
		waitpid(child, NULL, 0);
		return true;
	}
	return true; 
#endif
	
	
}

STRING System::GetTemporaryFolder()
{
#ifdef WINDOWS
	STRING tempFolder = (STRING)System::SafeAllocMemory(MAX_PATH + 1);
	if ( 0 == tempFolder) return 0;
	
	DWORD result = GetTempPathA(MAX_PATH, tempFolder);
	if ( 0 == result ) 
	{
		SafeFreeMemory(tempFolder);
		return 0; //WARNING: no check made for buffer's enough capcity
	}
	return tempFolder;
#else 
	return "/tmp/"; // for all NIX systems
#endif
}
int System::MemCmp(BYTE* m1, BYTE* m2, int len)
{
	for ( int i = 0; i < len; i++)
		if ( *(m1 + i) != *(m2 + i) )
			return -1;
	return 0;
}

void System::MemCpy(BYTE* m1, BYTE* m2, int count)
{
	while ( --count >= 0)
		*(m1 + count) = *(m2 + count);
}


#ifdef WINDOWS
static HANDLE consoleStdOut = 0;
#endif
void System::WriteLog(STRING value)
{
#ifdef WINDOWS
	DWORD dwWritten = 0;
	WriteConsoleA(consoleStdOut, value, String::StrLen(value),&dwWritten,0);
#else
	printf(value);
#endif
}

bool System::AllocateConsole(STRING title)
{
#ifdef WINDOWS
	bool result = AllocConsole();
	if (true == result)
	{
		result = SetConsoleTitleA(title);
		if ( true == result)
			consoleStdOut = GetStdHandle(STD_OUTPUT_HANDLE);
	}
	return result;
#else
	return true;
#endif
}