/* -*- 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 "subcomponentrecovery.hxx"

#include <sdbcoretools.hxx>
#include "storagexmlstream.hxx"
#include "subcomponentloader.hxx"
#include "settingsimport.hxx"

#include <com/sun/star/embed/ElementModes.hpp>
#include <com/sun/star/frame/ModuleManager.hpp>
#include <com/sun/star/document/XStorageBasedDocument.hpp>
#include <com/sun/star/ucb/XCommandProcessor.hpp>
#include <com/sun/star/container/XHierarchicalNameAccess.hpp>
#include <com/sun/star/sdb/XFormDocumentsSupplier.hpp>
#include <com/sun/star/sdb/XReportDocumentsSupplier.hpp>
#include <com/sun/star/xml/sax/XDocumentHandler.hpp>

#include <comphelper/namedvaluecollection.hxx>
#include <cppuhelper/implbase.hxx>
#include <connectivity/dbtools.hxx>
#include <comphelper/diagnose_ex.hxx>
#include <sal/log.hxx>
#include <xmloff/XMLSettingsExportContext.hxx>
#include <xmloff/SettingsExportHelper.hxx>

#include <stack>

namespace dbaccess
{

    using css::uno::Reference;
    using css::uno::UNO_QUERY;
    using css::uno::UNO_QUERY_THROW;
    using css::uno::UNO_SET_THROW;
    using css::uno::Exception;
    using css::uno::Any;
    using css::uno::Sequence;
    using css::uno::XComponentContext;
    using css::embed::XStorage;
    using css::sdb::application::XDatabaseDocumentUI;
    using css::beans::Pair;
    using css::frame::ModuleManager;
    using css::frame::XModuleManager2;
    using css::lang::XComponent;
    using css::frame::XModel;
    using css::frame::XController;
    using css::beans::XPropertySet;
    using css::beans::PropertyValue;
    using css::document::XStorageBasedDocument;
    using css::ucb::XCommandProcessor;
    using css::container::XHierarchicalNameAccess;
    using css::sdb::XFormDocumentsSupplier;
    using css::sdb::XReportDocumentsSupplier;
    using css::xml::sax::XLocator;
    using css::xml::sax::XDocumentHandler;
    using css::xml::sax::XAttributeList;

    namespace ElementModes = css::embed::ElementModes;
    namespace DatabaseObject = css::sdb::application::DatabaseObject;

    // helper
    namespace
    {
        OUString lcl_getComponentStorageBaseName( const SubComponentType i_eType )
        {
            switch ( i_eType )
            {
            case FORM:
                return "form";
            case REPORT:
                return "report";
            case TABLE:
                return "table";
            case QUERY:
                return "query";
            default:
                break;
            }

            OSL_FAIL( "lcl_getComponentStorageBaseName: unimplemented case!" );
            return OUString();
        }

        SubComponentType lcl_databaseObjectToSubComponentType( const sal_Int32 i_nObjectType )
        {
            switch ( i_nObjectType )
            {
            case DatabaseObject::TABLE: return TABLE;
            case DatabaseObject::QUERY: return QUERY;
            case DatabaseObject::FORM:  return FORM;
            case DatabaseObject::REPORT:return REPORT;
            default:
                break;
            }
            return UNKNOWN;
        }

        bool lcl_determineReadOnly( const Reference< XComponent >& i_rComponent )
        {
            Reference< XModel > xDocument( i_rComponent, UNO_QUERY );
            if ( !xDocument.is() )
            {
                Reference< XController > xController( i_rComponent, UNO_QUERY_THROW );
                xDocument = xController->getModel();
            }

            if ( !xDocument.is() )
                return false;

            ::comphelper::NamedValueCollection aDocArgs( xDocument->getArgs() );
            return aDocArgs.getOrDefault( "ReadOnly", false );
        }

        Reference< XCommandProcessor > lcl_getSubComponentDef_nothrow( const Reference< XDatabaseDocumentUI >& i_rAppUI,
            const SubComponentType i_eType, const OUString& i_rName )
        {
            Reference< XController > xController( i_rAppUI, UNO_QUERY_THROW );
            ENSURE_OR_RETURN( ( i_eType == FORM ) || ( i_eType == REPORT ), "lcl_getSubComponentDef_nothrow: illegal controller", nullptr );

            Reference< XCommandProcessor > xCommandProcessor;
            try
            {
                Reference< XHierarchicalNameAccess > xDefinitionContainer;
                if ( i_eType == FORM )
                {
                    Reference< XFormDocumentsSupplier > xSuppForms( xController->getModel(), UNO_QUERY_THROW );
                    xDefinitionContainer.set( xSuppForms->getFormDocuments(), UNO_QUERY_THROW );
                }
                else
                {
                    Reference< XReportDocumentsSupplier > xSuppReports( xController->getModel(), UNO_QUERY_THROW );
                    xDefinitionContainer.set( xSuppReports->getReportDocuments(), UNO_QUERY_THROW );
                }
                xCommandProcessor.set( xDefinitionContainer->getByHierarchicalName( i_rName ), UNO_QUERY_THROW );
            }
            catch( const Exception& )
            {
                DBG_UNHANDLED_EXCEPTION("dbaccess");
            }
            return xCommandProcessor;
        }

        constexpr OUString sSettingsStreamName = u"settings.xml"_ustr;
        constexpr OUString sCurrentQueryDesignName = u"ooo:current-query-design"_ustr;
    }

    namespace {

    // SettingsExportContext
    class SettingsExportContext : public ::xmloff::XMLSettingsExportContext
    {
    public:
        SettingsExportContext( const Reference<XComponentContext>& i_rContext, StorageXMLOutputStream& i_rDelegator )
            :m_rContext( i_rContext )
            ,m_rDelegator( i_rDelegator )
            ,m_aNamespace( ::xmloff::token::GetXMLToken( ::xmloff::token::XML_NP_CONFIG ) )
        {
        }

        virtual ~SettingsExportContext()
        {
        }

    public:
        virtual void    AddAttribute( enum ::xmloff::token::XMLTokenEnum i_eName, const OUString& i_rValue ) override;
        virtual void    AddAttribute( enum ::xmloff::token::XMLTokenEnum i_eName, enum ::xmloff::token::XMLTokenEnum i_eValue ) override;
        virtual void    StartElement( enum ::xmloff::token::XMLTokenEnum i_eName ) override;
        virtual void    EndElement  ( const bool i_bIgnoreWhitespace ) override;
        virtual void    Characters( const OUString& i_rCharacters ) override;

        virtual css::uno::Reference< css::uno::XComponentContext >
                        GetComponentContext() const override;

    private:
        OUString impl_prefix( const ::xmloff::token::XMLTokenEnum i_eToken )
        {
            return m_aNamespace + ":" + ::xmloff::token::GetXMLToken( i_eToken );
        }

    private:
        const Reference<XComponentContext>&   m_rContext;
        StorageXMLOutputStream& m_rDelegator;
        const OUString m_aNamespace;
    };

    }

    void SettingsExportContext::AddAttribute( enum ::xmloff::token::XMLTokenEnum i_eName, const OUString& i_rValue )
    {
        m_rDelegator.addAttribute( impl_prefix( i_eName ), i_rValue );
    }

    void SettingsExportContext::AddAttribute( enum ::xmloff::token::XMLTokenEnum i_eName, enum ::xmloff::token::XMLTokenEnum i_eValue )
    {
        m_rDelegator.addAttribute( impl_prefix( i_eName ), ::xmloff::token::GetXMLToken( i_eValue ) );
    }

    void SettingsExportContext::StartElement( enum ::xmloff::token::XMLTokenEnum i_eName )
    {
        m_rDelegator.ignorableWhitespace( " " );

        m_rDelegator.startElement( impl_prefix( i_eName ) );
    }

    void SettingsExportContext::EndElement( const bool i_bIgnoreWhitespace )
    {
        if ( i_bIgnoreWhitespace )
            m_rDelegator.ignorableWhitespace( " " );
        m_rDelegator.endElement();
    }

    void SettingsExportContext::Characters( const OUString& i_rCharacters )
    {
        m_rDelegator.characters( i_rCharacters );
    }

    Reference< css::uno::XComponentContext > SettingsExportContext::GetComponentContext() const
    {
        return m_rContext;
    }

    // SettingsDocumentHandler
    typedef ::cppu::WeakImplHelper<   XDocumentHandler
                                  >   SettingsDocumentHandler_Base;

    namespace {

    class SettingsDocumentHandler : public SettingsDocumentHandler_Base
    {
    public:
        SettingsDocumentHandler()
        {
        }

    protected:
        virtual ~SettingsDocumentHandler() override
        {
        }

    public:
        // XDocumentHandler
        virtual void SAL_CALL startDocument(  ) override;
        virtual void SAL_CALL endDocument(  ) override;
        virtual void SAL_CALL startElement( const OUString& aName, const Reference< XAttributeList >& xAttribs ) override;
        virtual void SAL_CALL endElement( const OUString& aName ) override;
        virtual void SAL_CALL characters( const OUString& aChars ) override;
        virtual void SAL_CALL ignorableWhitespace( const OUString& aWhitespaces ) override;
        virtual void SAL_CALL processingInstruction( const OUString& aTarget, const OUString& aData ) override;
        virtual void SAL_CALL setDocumentLocator( const Reference< XLocator >& xLocator ) override;

        const ::comphelper::NamedValueCollection&   getSettings() const { return m_aSettings; }

    private:
        std::stack< ::rtl::Reference< SettingsImport > >  m_aStates;
        ::comphelper::NamedValueCollection                  m_aSettings;
    };

    }

    void SAL_CALL SettingsDocumentHandler::startDocument(  )
    {
    }

    void SAL_CALL SettingsDocumentHandler::endDocument(  )
    {
    }

    void SAL_CALL SettingsDocumentHandler::startElement( const OUString& i_Name, const Reference< XAttributeList >& i_Attribs )
    {
        ::rtl::Reference< SettingsImport >  pNewState;

        if ( m_aStates.empty() )
        {
            if ( i_Name == "office:settings" )
            {
                pNewState = new OfficeSettingsImport( m_aSettings );
            }
            else
            {
                OSL_FAIL( "SettingsDocumentHandler::startElement: invalid settings file!" );
                // Yes, that's not correct. Somebody could, in theory, give us a document which starts with "foo:settings",
                // where "foo" is mapped to the proper namespace URL.
                // However, there's no need to bother with this. The "recovery" sub storage we're recovering from is
                // not part of ODF, so we can impose any format restrictions on it ...
            }
        }
        else
        {
            ::rtl::Reference< SettingsImport > pCurrentState( m_aStates.top() );
            pNewState = pCurrentState->nextState( i_Name );
        }

        ENSURE_OR_THROW( pNewState.is(), "no new state - aborting import" );
        pNewState->startElement( i_Attribs );

        m_aStates.push( pNewState );
    }

    void SAL_CALL SettingsDocumentHandler::endElement( const OUString& )
    {
        ENSURE_OR_THROW( !m_aStates.empty(), "no active element" );

        ::rtl::Reference< SettingsImport > pCurrentState( m_aStates.top() );
        pCurrentState->endElement();
        m_aStates.pop();
    }

    void SAL_CALL SettingsDocumentHandler::characters( const OUString& i_Chars )
    {
        ENSURE_OR_THROW( !m_aStates.empty(), "no active element" );

        ::rtl::Reference< SettingsImport > pCurrentState( m_aStates.top() );
        pCurrentState->characters( i_Chars );
    }

    void SAL_CALL SettingsDocumentHandler::ignorableWhitespace( const OUString& )
    {
        // ignore them - that's why they're called "ignorable"
    }

    void SAL_CALL SettingsDocumentHandler::processingInstruction( const OUString&, const OUString& )
    {
        OSL_FAIL( "SettingsDocumentHandler::processingInstruction: unexpected ..." );
    }

    void SAL_CALL SettingsDocumentHandler::setDocumentLocator( const Reference< XLocator >& ) {}

    // SubComponentRecovery
    OUString SubComponentRecovery::getComponentsStorageName( const SubComponentType i_eType )
    {
        switch ( i_eType )
        {
        case FORM:
            return "forms";
        case REPORT:
            return "reports";
        case TABLE:
            return "tables";
        case QUERY:
            return "queries";
        case RELATION_DESIGN:
            return "relations";
        default:
            break;
        }

        OSL_FAIL( "SubComponentRecovery::getComponentsStorageName: unimplemented case!" );
        return OUString();
    }

    void SubComponentRecovery::saveToRecoveryStorage( const Reference< XStorage >& i_rRecoveryStorage,
        MapCompTypeToCompDescs& io_mapCompDescs )
    {
        if ( m_eType == UNKNOWN )
            // quite fatal, but has already been reported (as assertion) before
            return;

        // open the sub storage for the given kind of components
        const OUString& rStorageName( getComponentsStorageName( m_eType ) );
        const Reference< XStorage > xComponentsStorage( i_rRecoveryStorage->openStorageElement(
            rStorageName, ElementModes::READWRITE ), UNO_SET_THROW );

        // find a free sub storage name, and create Yet Another Sub Storage
        const OUString& rBaseName( lcl_getComponentStorageBaseName( m_eType ) );
        const OUString sStorName = ::dbtools::createUniqueName( xComponentsStorage, rBaseName );
        const Reference< XStorage > xObjectStor( xComponentsStorage->openStorageElement(
            sStorName, ElementModes::READWRITE ), UNO_SET_THROW );

        switch ( m_eType )
        {
        case FORM:
        case REPORT:
            impl_saveSubDocument_throw( xObjectStor );
            break;

        case QUERY:
            impl_saveQueryDesign_throw( xObjectStor );
            break;

        default:
            // TODO
            OSL_FAIL( "SubComponentRecoverys::saveToRecoveryStorage: unimplemented case!" );
            break;
        }

        // commit the storage(s)
        tools::stor::commitStorageIfWriteable( xObjectStor );
        tools::stor::commitStorageIfWriteable( xComponentsStorage );

        // remember the relationship from the component name to the storage name
        MapStringToCompDesc& rMapCompDescs = io_mapCompDescs[ m_eType ];
        OSL_ENSURE( rMapCompDescs.find( sStorName ) == rMapCompDescs.end(),
            "SubComponentRecoverys::saveToRecoveryStorage: object name already used!" );
        rMapCompDescs[ sStorName ] = m_aCompDesc;
    }

    void SubComponentRecovery::impl_identifyComponent_throw()
    {
        // ask the controller
        Pair< sal_Int32, OUString > aComponentIdentity = m_xDocumentUI->identifySubComponent( m_xComponent );
        m_eType = lcl_databaseObjectToSubComponentType( aComponentIdentity.First );
        m_aCompDesc.sName = aComponentIdentity.Second;

        // what the controller didn't give us is the information whether this is in edit mode or not ...
        Reference< XModuleManager2 > xModuleManager( ModuleManager::create(m_rContext) );
        const OUString sModuleIdentifier = xModuleManager->identify( m_xComponent );

        switch ( m_eType )
        {
        case TABLE:
            m_aCompDesc.bForEditing = sModuleIdentifier == "com.sun.star.sdb.TableDesign";
            break;

        case QUERY:
            m_aCompDesc.bForEditing = sModuleIdentifier == "com.sun.star.sdb.QueryDesign";
            break;

        case REPORT:
            if ( sModuleIdentifier == "com.sun.star.report.ReportDefinition" )
            {
                // it's an SRB report designer
                m_aCompDesc.bForEditing = true;
                break;
            }
            [[fallthrough]];

        case FORM:
            m_aCompDesc.bForEditing = !lcl_determineReadOnly( m_xComponent );
            break;

        default:
            if ( sModuleIdentifier == "com.sun.star.sdb.RelationDesign" )
            {
                m_eType = RELATION_DESIGN;
                m_aCompDesc.bForEditing = true;
            }
            else
            {
                OSL_FAIL( "SubComponentRecovery::impl_identifyComponent_throw: couldn't classify the given sub component!" );
            }
            break;
        }

        SAL_WARN_IF( m_eType == UNKNOWN, "dbaccess",
            "SubComponentRecovery::impl_identifyComponent_throw: couldn't classify the component!" );
    }

    void SubComponentRecovery::impl_saveQueryDesign_throw( const Reference< XStorage >& i_rObjectStorage )
    {
        ENSURE_OR_THROW( m_eType == QUERY, "illegal sub component type" );
        ENSURE_OR_THROW( i_rObjectStorage.is(), "illegal storage" );

        // retrieve the current query design (which might differ from what we can retrieve as ActiveCommand property, since
        // the latter is updated only upon successful save of the design)
        Reference< XPropertySet > xDesignerProps( m_xComponent, UNO_QUERY_THROW );
        Sequence< PropertyValue > aCurrentQueryDesign;
        OSL_VERIFY( xDesignerProps->getPropertyValue( "CurrentQueryDesign" ) >>= aCurrentQueryDesign );

        // write the query design
        StorageXMLOutputStream aDesignOutput( m_rContext, i_rObjectStorage, sSettingsStreamName );
        SettingsExportContext aSettingsExportContext( m_rContext, aDesignOutput );

        static constexpr OUString sWhitespace( u" "_ustr );

        aDesignOutput.startElement( "office:settings" );
        aDesignOutput.ignorableWhitespace( sWhitespace );

        XMLSettingsExportHelper aSettingsExporter( aSettingsExportContext );
        aSettingsExporter.exportAllSettings( aCurrentQueryDesign, sCurrentQueryDesignName );

        aDesignOutput.ignorableWhitespace( sWhitespace );
        aDesignOutput.endElement();
        aDesignOutput.close();
    }

    void SubComponentRecovery::impl_saveSubDocument_throw( const Reference< XStorage >& i_rObjectStorage )
    {
        ENSURE_OR_THROW( ( m_eType == FORM ) || ( m_eType == REPORT ), "illegal sub component type" );
        ENSURE_OR_THROW( i_rObjectStorage.is(), "illegal storage" );

        // store the document into the storage
        Reference< XStorageBasedDocument > xStorageDocument( m_xComponent, UNO_QUERY_THROW );
        xStorageDocument->storeToStorage( i_rObjectStorage, Sequence< PropertyValue >() );
    }

    Reference< XComponent > SubComponentRecovery::impl_recoverSubDocument_throw( const Reference< XStorage >& i_rRecoveryStorage,
            const OUString& i_rComponentName, const bool i_bForEditing )
    {
        Reference< XComponent > xSubComponent;
        Reference< XCommandProcessor > xDocDefinition;

        ::comphelper::NamedValueCollection aLoadArgs;
        aLoadArgs.put( "RecoveryStorage", i_rRecoveryStorage );

        // load/create the sub component hidden. We'll show it when the main app window is shown.
        aLoadArgs.put( "Hidden", true );

        if ( !i_rComponentName.isEmpty() )
        {
            xDocDefinition = lcl_getSubComponentDef_nothrow( m_xDocumentUI, m_eType, i_rComponentName );
            xSubComponent.set( m_xDocumentUI->loadComponentWithArguments(
                    m_eType,
                    i_rComponentName,
                    i_bForEditing,
                    aLoadArgs.getPropertyValues()
                ),
                UNO_SET_THROW
            );
        }
        else
        {
            Reference< XComponent > xDocDefComponent;
            xSubComponent.set( m_xDocumentUI->createComponentWithArguments(
                    m_eType,
                    aLoadArgs.getPropertyValues(),
                    xDocDefComponent
                ),
                UNO_SET_THROW
            );

            xDocDefinition.set( xDocDefComponent, UNO_QUERY );
            OSL_ENSURE( xDocDefinition.is(), "DatabaseDocumentRecovery::recoverSubDocuments: loaded a form/report, but don't have a document definition?!" );
        }

        if ( xDocDefinition.is() )
        {
            Reference< XController > xController( m_xDocumentUI, UNO_QUERY_THROW );
            rtl::Reference( new SubComponentLoader( xController, xDocDefinition ) );
        }

        return xSubComponent;
    }

    Reference< XComponent > SubComponentRecovery::impl_recoverQueryDesign_throw( const Reference< XStorage >& i_rRecoveryStorage,
        const OUString& i_rComponentName,  const bool i_bForEditing )
    {
        Reference< XComponent > xSubComponent;

        // first read the settings query design settings from the storage
        StorageXMLInputStream aDesignInput( m_rContext, i_rRecoveryStorage, sSettingsStreamName );

        ::rtl::Reference< SettingsDocumentHandler > pDocHandler( new SettingsDocumentHandler );
        aDesignInput.import( pDocHandler );

        const ::comphelper::NamedValueCollection& rSettings( pDocHandler->getSettings() );
        const Any& aCurrentQueryDesign = rSettings.get( sCurrentQueryDesignName );
#if OSL_DEBUG_LEVEL > 0
        Sequence< PropertyValue > aQueryDesignLayout;
        OSL_VERIFY( aCurrentQueryDesign >>= aQueryDesignLayout );
#endif

        // then load the query designer
        ::comphelper::NamedValueCollection aLoadArgs;
        aLoadArgs.put( "CurrentQueryDesign", aCurrentQueryDesign );
        aLoadArgs.put( "Hidden", true );

        if ( !i_rComponentName.isEmpty() )
        {
            xSubComponent.set( m_xDocumentUI->loadComponentWithArguments(
                    m_eType,
                    i_rComponentName,
                    i_bForEditing,
                    aLoadArgs.getPropertyValues()
                ),
                UNO_SET_THROW
            );
        }
        else
        {
            Reference< XComponent > xDummy;
            xSubComponent.set( m_xDocumentUI->createComponentWithArguments(
                    m_eType,
                    aLoadArgs.getPropertyValues(),
                    xDummy
                ),
                UNO_SET_THROW
            );
        }

        Reference< XController > xController( m_xDocumentUI, UNO_QUERY_THROW );
        rtl::Reference( new SubComponentLoader( xController, xSubComponent ) );

        return xSubComponent;
    }

    Reference< XComponent > SubComponentRecovery::recoverFromStorage( const Reference< XStorage >& i_rRecoveryStorage,
            const OUString& i_rComponentName, const bool i_bForEditing )
    {
        Reference< XComponent > xSubComponent;
        switch ( m_eType )
        {
        case FORM:
        case REPORT:
            xSubComponent = impl_recoverSubDocument_throw( i_rRecoveryStorage, i_rComponentName, i_bForEditing );
            break;
        case QUERY:
            xSubComponent = impl_recoverQueryDesign_throw( i_rRecoveryStorage, i_rComponentName, i_bForEditing );
            break;
        default:
            OSL_FAIL( "SubComponentRecovery::recoverFromStorage: unimplemented case!" );
            break;
        }
        return xSubComponent;
    }

} // namespace dbaccess

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