/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
 * This file is part of the LibreOffice project.
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 *
 * This file incorporates work covered by the following license notice:
 *
 *   Licensed to the Apache Software Foundation (ASF) under one or more
 *   contributor license agreements. See the NOTICE file distributed
 *   with this work for additional information regarding copyright
 *   ownership. The ASF licenses this file to you under the Apache
 *   License, Version 2.0 (the "License"); you may not use this file
 *   except in compliance with the License. You may obtain a copy of
 *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
 */


#include "asyncfilepicker.hxx"
#include "iodlg.hxx"
#include <svtools/fileview.hxx>
#include <tools/debug.hxx>
#include <osl/diagnose.h>

#include <memory>


namespace svt
{
    AsyncPickerAction::AsyncPickerAction( SvtFileDialog_Base* _pDialog, SvtFileView* _pView, const Action _eAction )
        :m_eAction  ( _eAction )
        ,m_pView    ( _pView   )
        ,m_pDialog  ( _pDialog )
        ,m_bRunning ( false    )
    {
        assert( m_pDialog && "AsyncPickerAction::AsyncPickerAction: invalid dialog!" );
        assert( m_pView && "AsyncPickerAction::AsyncPickerAction: invalid view!" );
    }


    AsyncPickerAction::~AsyncPickerAction()
    {
    }


    void AsyncPickerAction::cancel()
    {
        DBG_TESTSOLARMUTEX();
            // if this asserts, we'd need to have an own mutex per instance

        OSL_ENSURE( m_bRunning, "AsyncPickerAction::cancel: not running" );
        if ( m_pView )
            m_pView->CancelRunningAsyncAction();
    }


    void AsyncPickerAction::execute(
        const OUString& _rURL,
        const OUString& _rFilter,
        sal_Int32 _nMinTimeout,
        sal_Int32 _nMaxTimeout,
        const css::uno::Sequence< OUString >& rBlackList )
    {
        DBG_TESTSOLARMUTEX();
            // if this asserts, we'd need to have an own mutex per instance

        sal_Int32 nMinTimeout = _nMinTimeout;
        sal_Int32 nMaxTimeout = _nMaxTimeout;
        // normalizations
        if ( nMinTimeout < 0 )
            // if negative, this is considered as "do it synchronously"
            nMinTimeout = 0;
        else if ( nMinTimeout < 1000 )
            nMinTimeout = 1000;
        if ( nMaxTimeout <= nMinTimeout )
            nMaxTimeout = nMinTimeout + 30000;

        std::unique_ptr< FileViewAsyncAction > pActionDescriptor;
        if ( nMinTimeout )
        {
            pActionDescriptor.reset( new FileViewAsyncAction );
            pActionDescriptor->nMinTimeout = nMinTimeout;
            pActionDescriptor->nMaxTimeout = nMaxTimeout;
            pActionDescriptor->aFinishHandler = LINK( this, AsyncPickerAction, OnActionDone );
        }

        FileViewResult eResult = eFailure;
        m_sURL = _rURL;
        switch ( m_eAction )
        {
        case ePrevLevel:
            eResult = m_pView->PreviousLevel( pActionDescriptor.get() );
            break;

        case eOpenURL:
            eResult = m_pView->Initialize( _rURL, _rFilter, pActionDescriptor.get(), rBlackList );
            break;

        case eExecuteFilter:
            // preserve the filename (FS: why?)
            m_sFileName = m_pDialog->getCurrentFileText();
            // execute the new filter
            eResult = m_pView->ExecuteFilter( _rFilter, pActionDescriptor.get() );
            break;

        default:
            OSL_FAIL( "AsyncPickerAction::execute: unknown action!" );
            break;
        }

        acquire();
        if ( ( eResult == eSuccess ) || ( eResult == eFailure ) )
        {
            // the handler is only called if the action could not be finished within
            // the given minimum time period. In case of success, we need to call it
            // explicitly
            OnActionDone( reinterpret_cast< void* >( eResult ) );
        }
        else if ( eResult == eStillRunning )
        {
            m_bRunning = true;
            m_pDialog->onAsyncOperationStarted();
        }
    }


    IMPL_LINK( AsyncPickerAction, OnActionDone, void*, pEmptyArg, void )
    {
        DBG_TESTSOLARMUTEX();
            // if this asserts, we'd need to have an own mutex per instance

        FileViewResult eResult = static_cast< FileViewResult >( reinterpret_cast< sal_IntPtr >( pEmptyArg ) );
        OSL_ENSURE( eStillRunning != eResult, "AsyncPickerAction::OnActionDone: invalid result!" );

        // release once (since we acquired in |execute|), but keep alive until the
        // end of the method
        ::rtl::Reference< AsyncPickerAction > xKeepAlive( this );
        release();

        m_pDialog->onAsyncOperationFinished();
        m_bRunning = true;

        if ( eFailure == eResult )
            // TODO: do we need some kind of cleanup here?
            return;

        if ( eTimeout == eResult )
        {
            SvtFileDialog::displayIOException( m_sURL, css::ucb::IOErrorCode_CANT_READ );
            return;
        }

        OSL_ENSURE( eSuccess == eResult, "AsyncPickerAction::OnActionDone: what else valid results are there?" );

        switch ( m_eAction )
        {
        case ePrevLevel:
        case eOpenURL:
            m_pDialog->UpdateControls( m_pView->GetViewURL() );
            break;

        case eExecuteFilter:
            // restore the filename
            m_pView->SetNoSelection();
            m_pDialog->setCurrentFileText( m_sFileName, true );

            // notify listeners
            m_pDialog->FilterSelect();
            break;

        default:
            OSL_FAIL( "AsyncPickerAction::OnActionDone: unknown action!" );
            break;
        }
    }


} // namespace svt


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