// **************************************************************************
// * This file is part of the FreeFileSync project. It is distributed under *
// * GNU General Public License: http://www.gnu.org/licenses/gpl.html       *
// * Copyright (C) ZenJu (zenju AT gmx DOT de) - All Rights Reserved        *
// **************************************************************************

#ifndef EXECUTE_HEADER_23482134578134134
#define EXECUTE_HEADER_23482134578134134

#include <wx/msgdlg.h>

#ifdef FFS_WIN
#include <zen/last_error.h>
#include <zen/string_tools.h>
#include <zen/i18n.h>
#include <zen/win.h> //includes "windows.h"
//#include <zen/scope_guard.h>

#elif defined FFS_LINUX
#include <stdlib.h>
#include <wx/utils.h>
#include <wx/log.h>
#endif


namespace zen
{
//launch commandline and report errors via popup dialog
//windows: COM needs to be initialized before calling this function!
namespace
{
enum ExecutionType
{
    EXEC_TYPE_SYNC,
    EXEC_TYPE_ASYNC
};

void shellExecute(const wxString& command, ExecutionType type = EXEC_TYPE_ASYNC)
{
#ifdef FFS_WIN
    //parse commandline
    std::vector<std::wstring> argv;
    int argc = 0;
    if (LPWSTR* tmp = ::CommandLineToArgvW(command.c_str(), &argc))
    {
        std::copy(tmp, tmp + argc, std::back_inserter(argv));
        ::LocalFree(tmp);
    }

    wxString filename;
    wxString arguments;
    if (!argv.empty())
    {
        filename = argv[0];
        for (auto iter = argv.begin() + 1; iter != argv.end(); ++iter)
            arguments += (iter != argv.begin() ? L" " : L"") +
                         (iter->empty() || std::any_of(iter->begin(), iter->end(), &isWhiteSpace<wchar_t>) ? L"\"" + *iter + L"\"" : *iter);
    }

    SHELLEXECUTEINFO execInfo = {};
    execInfo.cbSize = sizeof(execInfo);

    //SEE_MASK_NOASYNC is equal to SEE_MASK_FLAG_DDEWAIT, but former is defined not before Win SDK 6.0
    execInfo.fMask        = type == EXEC_TYPE_SYNC ? (SEE_MASK_NOCLOSEPROCESS | SEE_MASK_FLAG_DDEWAIT) : 0; //don't use SEE_MASK_ASYNCOK -> returns successful despite errors!
    execInfo.fMask       |= SEE_MASK_UNICODE | SEE_MASK_FLAG_NO_UI; //::ShellExecuteEx() shows a non-blocking pop-up dialog on errors -> we want a blocking one
    execInfo.lpVerb       = nullptr;
    execInfo.lpFile       = filename.c_str();
    execInfo.lpParameters = arguments.c_str();
    execInfo.nShow        = SW_SHOWNORMAL;

    if (!::ShellExecuteEx(&execInfo)) //__inout  LPSHELLEXECUTEINFO lpExecInfo
    {
        wxString cmdFmt = L"File: " + filename + L"\nArg: " + arguments;
        wxMessageBox(_("Invalid command line:") + L"\n" + cmdFmt + L"\n\n" + getLastErrorFormatted());
        return;
    }

    if (execInfo.hProcess)
    {
        if (type == EXEC_TYPE_SYNC)
            ::WaitForSingleObject(execInfo.hProcess, INFINITE);
        ::CloseHandle(execInfo.hProcess);
    }

#elif defined FFS_LINUX
    if (type == EXEC_TYPE_SYNC)
    {
        //Posix::system - execute a shell command
        int rv = ::system(utfCvrtTo<std::string>(command).c_str()); //do NOT use std::system as its documentation says nothing about "WEXITSTATUS(rv)", ect...
        if (rv == -1 || WEXITSTATUS(rv) == 127) //http://linux.die.net/man/3/system    "In case /bin/sh could not be executed, the exit status will be that of a command that does exit(127)"
        {
            wxMessageBox(_("Invalid command line:") + L"\n" + command);
            return;
        }
    }
    else
    {
        // ! unfortunately it seems there is no way on Linux to get a failure notification for calling an invalid command line asynchronously !

        //by default wxExecute uses a zero sized dummy window as a hack to keep focus which leaves a useless empty icon in ALT-TAB list
        //=> use wxEXEC_NODISABLE and roll our own window disabler! (see comment in  app.cpp: void *wxGUIAppTraits::BeforeChildWaitLoop())
        wxWindowDisabler dummy; //disables all top level windows
        wxExecute(command, wxEXEC_ASYNC | wxEXEC_NODISABLE);
        wxLog::FlushActive(); //show wxWidgets error messages (if any)
    }
#endif
}
}
}

#endif //EXECUTE_HEADER_23482134578134134