// Copyright (c) .NET Foundation. All rights reserved.
// Licensed under the MIT License. See License.txt in the project root for license information.

#include "precomp.hxx"

APPLICATION::~APPLICATION()
{
    if (m_pAppOfflineHtm != NULL)
    {
        m_pAppOfflineHtm->DereferenceAppOfflineHtm();
        m_pAppOfflineHtm = NULL;
    }

    if (m_pFileWatcherEntry != NULL)
    {
        // Mark the entry as invalid,
        // StopMonitor will close the file handle and trigger a FCN
        // the entry will delete itself when processing this FCN 
        m_pFileWatcherEntry->MarkEntryInValid();
        m_pFileWatcherEntry->StopMonitor();
        m_pFileWatcherEntry = NULL;
    }
}

HRESULT
APPLICATION::StartMonitoringAppOffline()
{
    HRESULT hr = S_OK;
    if (m_pFileWatcherEntry != NULL)
    {
        hr = m_pFileWatcherEntry->Create(m_pConfiguration->QueryApplicationFullPath()->QueryStr(), L"app_offline.htm", this, NULL);
    }
    return hr;
}

VOID
APPLICATION::UpdateAppOfflineFileHandle()
{
    STRU strFilePath;
    PATH::ConvertPathToFullPath(L".\\app_offline.htm", m_pConfiguration->QueryApplicationFullPath()->QueryStr(), &strFilePath);
    APP_OFFLINE_HTM *pOldAppOfflineHtm = NULL;
    APP_OFFLINE_HTM *pNewAppOfflineHtm = NULL;

    if (INVALID_FILE_ATTRIBUTES == GetFileAttributes(strFilePath.QueryStr()) && GetLastError() == ERROR_FILE_NOT_FOUND)
    {
        m_fAppOfflineFound = FALSE;
    }
    else
    {
        m_fAppOfflineFound = TRUE;
        pNewAppOfflineHtm = new APP_OFFLINE_HTM(strFilePath.QueryStr());

        if ( pNewAppOfflineHtm != NULL )
        {
            if (pNewAppOfflineHtm->Load())
            {
                //
                // loaded the new app_offline.htm
                //
                pOldAppOfflineHtm = (APP_OFFLINE_HTM *)InterlockedExchangePointer((VOID**)&m_pAppOfflineHtm, pNewAppOfflineHtm);

                if (pOldAppOfflineHtm != NULL)
                {
                    pOldAppOfflineHtm->DereferenceAppOfflineHtm();
                    pOldAppOfflineHtm = NULL;
                }
            }
            else
            {
                // ignored the new app_offline file because the file does not exist.
                pNewAppOfflineHtm->DereferenceAppOfflineHtm(); 
                pNewAppOfflineHtm = NULL;
            }
        }

        OnAppOfflineHandleChange();
    }
}