/*
 *  The ManaPlus Client
 *  Copyright (C) 2011-2012  The ManaPlus Developers
 *
 *  This file is part of The ManaPlus Client.
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include "utils/process.h"

#include <string.h>
#include <cstdarg>
#include <cstdio>

#include <stdlib.h>

#include "debug.h"

#include "localconsts.h"

const int timeOut = 10;

#ifdef WIN32

#include <windows.h>

int execFile(std::string pathName, std::string name,
             std::string arg1, std::string arg2, int waitTime)
{
    if (!waitTime)
        waitTime = timeOut;

    STARTUPINFO siStartupInfo;
    PROCESS_INFORMATION piProcessInfo;
    memset(&siStartupInfo, 0, sizeof(siStartupInfo));
    memset(&piProcessInfo, 0, sizeof(piProcessInfo));
    siStartupInfo.cb = sizeof(siStartupInfo); 
    DWORD ret = -1;
    std::string args(pathName + " " + arg1);
    if (!arg2.empty())
        args += " " + arg2;

    if (CreateProcess(pathName.c_str(), (char*)args.c_str(), 0, 0, false,
        CREATE_DEFAULT_ERROR_MODE, 0, 0, &siStartupInfo,
        &piProcessInfo) != false)
    {
        if (!WaitForSingleObject(piProcessInfo.hProcess, timeOut * 1000))
        {
            if (GetExitCodeProcess(piProcessInfo.hProcess, &ret))
            {
                CloseHandle(piProcessInfo.hProcess);
                CloseHandle(piProcessInfo.hThread);
                return ret;
            }
        }
        TerminateProcess(piProcessInfo.hProcess, -1);
    }

    CloseHandle(piProcessInfo.hProcess);
    CloseHandle(piProcessInfo.hThread);
    return -1;
}

#elif defined(__APPLE__)

int execFile(std::string pathName, std::string name,
             std::string arg1, std::string arg2, int waitTime)
{
    return -1;
}

#elif defined __linux__ || defined __linux

#include <sys/types.h>
#include <sys/wait.h>

int execFile(std::string pathName, std::string name,
             std::string arg1, std::string arg2, int waitTime)
{
    pid_t mon_pid;
    int status;

    if (!waitTime)
        waitTime = timeOut;

    if ((mon_pid = fork()) == -1)
    {   // fork error
        return -1;
    }
    else if (!mon_pid)
    {   // monitoring child
        pid_t pid;
        if ((pid = fork()) == -1)
        {   // fork error
            return -1;
        }
        else if (!pid)
        {   // work child
            if (arg2.empty())
            {
                execl(pathName.c_str(), name.c_str(),
                      arg1.c_str(), (char *)nullptr);
            }
            else
            {
                execl(pathName.c_str(), name.c_str(),
                      arg1.c_str(), arg2.c_str(), (char *)nullptr);
            }
            exit(0);
        }

        // monitoring process
        pid_t sleep_pid;
        if ((sleep_pid = fork()) == -1)
        {   // fork error
            return -1;
        }
        else if (!sleep_pid)
        {   // sleep pid
            sleep (timeOut);
//            printf ("time out\n");
            exit(-1);
        }

        // monitoring process
        pid_t exited_pid = wait(&status);
        int ret = -1;
        if (exited_pid == pid)
        {
            kill(sleep_pid, SIGKILL);
            if (WIFEXITED(status))
                ret = WEXITSTATUS(status);
        }
        else
        {
            kill(pid, SIGKILL);
            ret = -1;
        }
        wait(nullptr);
        exit(ret);
    }

    // monitoring parent
    waitpid(mon_pid, &status, 0);
    if (WIFEXITED(status))
        return WEXITSTATUS(status);

    return -1;
}

#else

int execFile(std::string pathName, std::string name,
             std::string arg1, std::string arg2, int waitTime)
{
    return -1;
}

#endif