/////////////////////////////////////////////////////////////////////////////
// Name:        src/msw/main.cpp
// Purpose:     WinMain/DllMain
// Author:      Julian Smart
// Created:     04/01/98
// Copyright:   (c) Julian Smart
// Licence:     wxWindows licence
/////////////////////////////////////////////////////////////////////////////

// ============================================================================
// declarations
// ============================================================================

// ----------------------------------------------------------------------------
// headers
// ----------------------------------------------------------------------------

// For compilers that support precompilation, includes "wx.h".
#include "wx/wxprec.h"


#ifndef WX_PRECOMP
    #include "wx/event.h"
    #include "wx/app.h"
    #include "wx/utils.h"
#endif //WX_PRECOMP

#include "wx/dynlib.h"

#include "wx/private/init.h"

#include "wx/msw/private.h"
#include "wx/msw/seh.h"

#if wxUSE_ON_FATAL_EXCEPTION
    #include "wx/datetime.h"
    #include "wx/msw/crashrpt.h"
#endif // wxUSE_ON_FATAL_EXCEPTION

// defined in common/init.cpp
extern int wxEntryReal(int& argc, wxChar **argv);

// ============================================================================
// implementation: various entry points
// ============================================================================

#if wxUSE_BASE

// ----------------------------------------------------------------------------
// wrapper wxEntry catching all Win32 exceptions occurring in a wx program
// ----------------------------------------------------------------------------

// wrap real wxEntry in a try-except block to be able to call
// OnFatalException() if necessary
#if wxUSE_ON_FATAL_EXCEPTION

// global pointer to exception information, only valid inside OnFatalException,
// used by wxStackWalker and wxCrashReport
EXCEPTION_POINTERS *wxGlobalSEInformation = nullptr;

// flag telling us whether the application wants to handle exceptions at all
static bool gs_handleExceptions = false;

unsigned long wxGlobalSEHandler(EXCEPTION_POINTERS *pExcPtrs)
{
    if ( gs_handleExceptions && wxTheApp )
    {
        // store the pointer to exception info
        wxGlobalSEInformation = pExcPtrs;

        // give the user a chance to do something special about this
        wxSEH_TRY
        {
            wxTheApp->OnFatalException();
        }
        wxSEH_IGNORE      // ignore any exceptions inside the exception handler

        wxGlobalSEInformation = nullptr;

        // this will execute our handler and terminate the process
        return EXCEPTION_EXECUTE_HANDLER;
    }

    return EXCEPTION_CONTINUE_SEARCH;
}

#ifdef __VISUALC__

void wxSETranslator(unsigned int WXUNUSED(code), EXCEPTION_POINTERS *ep)
{
    switch ( wxGlobalSEHandler(ep) )
    {
        default:
            wxFAIL_MSG( wxT("unexpected wxGlobalSEHandler() return value") );
            wxFALLTHROUGH;

        case EXCEPTION_EXECUTE_HANDLER:
            // if wxApp::OnFatalException() had been called we should exit the
            // application -- but we shouldn't kill our host when we're a DLL
#ifndef WXMAKINGDLL
            // use the same exit code as abort()
            ::ExitProcess(3);
#endif // not a DLL
            break;

        case EXCEPTION_CONTINUE_SEARCH:
            // we're called for each "catch ( ... )" and if we (re)throw from
            // here, the catch handler body is not executed, so the effect is
            // as if had inhibited translation of SE to C++ ones because the
            // handler will never see any structured exceptions
            throw;
    }
}

#endif // __VISUALC__

bool wxHandleFatalExceptions(bool doit)
{
    // assume this can only be called from the main thread
    gs_handleExceptions = doit;

#if wxUSE_CRASHREPORT
    if ( doit )
    {
        // try to find a place where we can put out report file later
        wxChar fullname[MAX_PATH];
        if ( !::GetTempPath(WXSIZEOF(fullname), fullname) )
        {
            wxLogLastError(wxT("GetTempPath"));

            // when all else fails...
            wxStrcpy(fullname, wxT("c:\\"));
        }

        // use PID and date to make the report file name more unique
        wxString name = wxString::Format
                        (
#if wxUSE_DATETIME
                            wxT("%s_%s_%lu.dmp"),
#else
                            wxT("%s_%lu.dmp"),
#endif
                            wxTheApp ? (const wxChar*)wxTheApp->GetAppDisplayName().c_str()
                                     : wxT("wxwindows"),
#if wxUSE_DATETIME
                            wxDateTime::Now().Format(wxT("%Y%m%dT%H%M%S")).c_str(),
#endif
                            ::GetCurrentProcessId()
                        );

        wxStrncat(fullname, name, WXSIZEOF(fullname) - wxStrlen(fullname) - 1);

        wxCrashReport::SetFileName(fullname);
    }
#endif // wxUSE_CRASHREPORT

    return true;
}

int wxEntry(int& argc, wxChar **argv)
{
    DisableAutomaticSETranslator();

    wxSEH_TRY
    {
        return wxEntryReal(argc, argv);
    }
    wxSEH_HANDLE(wxApp::GetFatalErrorExitCode())
}

#else // !wxUSE_ON_FATAL_EXCEPTION

int wxEntry(int& argc, wxChar **argv)
{
    return wxEntryReal(argc, argv);
}

#endif // wxUSE_ON_FATAL_EXCEPTION/!wxUSE_ON_FATAL_EXCEPTION

#endif // wxUSE_BASE

// ----------------------------------------------------------------------------
// Windows-specific wxEntry
// ----------------------------------------------------------------------------

#if wxUSE_GUI

// common part of wxMSW-specific wxEntryStart() and wxEntry() overloads
static bool
wxMSWEntryCommon(HINSTANCE hInstance, int nCmdShow)
{
    // remember the parameters Windows gave us
    wxSetInstance(hInstance);
#ifdef __WXMSW__
    wxApp::m_nCmdShow = nCmdShow;
#else
    wxUnusedVar(nCmdShow);
#endif

    wxInitData::Get().MSWInitialize();

    return true;
}

WXDLLIMPEXP_CORE bool wxEntryStart(HINSTANCE hInstance,
                              HINSTANCE WXUNUSED(hPrevInstance),
                              wxCmdLineArgType WXUNUSED(pCmdLine),
                              int nCmdShow)
{
    if ( !wxMSWEntryCommon(hInstance, nCmdShow) )
       return false;

    auto& initData = wxInitData::Get();
    return wxEntryStart(initData.argc, initData.argv);
}

WXDLLIMPEXP_CORE int wxEntry(HINSTANCE hInstance,
                        HINSTANCE WXUNUSED(hPrevInstance),
                        wxCmdLineArgType WXUNUSED(pCmdLine),
                        int nCmdShow)
{
    if ( !wxMSWEntryCommon(hInstance, nCmdShow) )
        return wxApp::GetFatalErrorExitCode();

    auto& initData = wxInitData::Get();
    return wxEntry(initData.argc, initData.argv);
}

#endif // wxUSE_GUI

// ----------------------------------------------------------------------------
// global HINSTANCE
// ----------------------------------------------------------------------------

#if wxUSE_BASE

int wxEntry()
{
    wxInitData::Get().MSWInitialize();

    auto& initData = wxInitData::Get();
    return wxEntry(initData.argc, initData.argv);
}

static HINSTANCE wxhInstance;

extern "C" HINSTANCE wxGetInstance()
{
    return wxhInstance;
}

void wxSetInstance(HINSTANCE hInst)
{
    wxhInstance = hInst;
}

#endif // wxUSE_BASE
