/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */

/*

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 * 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 .

 */

#pragma once

#include <cppuhelper/weakref.hxx>

#include <rtl/ref.hxx>

#include <osl/mutex.hxx>

#include <svx/IAccessibleViewForwarder.hxx>

#include <svx/IAccessibleParent.hxx>

#include <svx/AccessibleControlShape.hxx>

#include <o3tl/typed_flags_set.hxx>

#include <unotools/weakref.hxx>

#include <vector>

#include <memory>

#include <o3tl/sorted_vector.hxx>

class SwAccessibleParagraph;

class SwViewShell;

class SwFrame;

class SwTextFrame;

class SwPageFrame;

class SwAccessibleContext;

class SwAccessibleEventList_Impl;

class SwAccessibleEventMap_Impl;

class SdrObject;

namespace accessibility { class AccessibleShape; }

class SwAccessibleShapeMap_Impl;

struct SwAccessibleEvent_Impl;

class SwAccessibleSelectedParas_Impl;

class SwRect;

class MapMode;

class SwAccPreviewData;

class SwFEShell;

class Fraction;

struct PreviewPage;

namespace vcl { class Window; }

namespace com::sun::star::accessibility { class XAccessible; }

enum class AccessibleStates

{

    NONE                   = 0x0000,

    // real states for events

    EDITABLE               = 0x0001,

    OPAQUE                 = 0x0002,

    // pseudo states for events

    TEXT_ATTRIBUTE_CHANGED = 0x0200,

    TEXT_SELECTION_CHANGED = 0x0100,

    CARET                  = 0x0080,

    RELATION_FROM          = 0x0040,

    RELATION_TO            = 0x0020,

};

namespace o3tl

{

    template<> struct typed_flags<AccessibleStates> : is_typed_flags<AccessibleStates, 0x3e3> {};

}

using SwAccessibleContextMap

    = std::unordered_map<const SwFrame*, unotools::WeakReference<SwAccessibleContext>>;

class SwAccessibleMap final : public ::accessibility::IAccessibleViewForwarder,

                        public ::accessibility::IAccessibleParent

                , public std::enable_shared_from_this<SwAccessibleMap>

{

    ::osl::Mutex maEventMutex;

    SwAccessibleContextMap maFrameMap;

    std::unique_ptr<SwAccessibleShapeMap_Impl> mpShapeMap;

    // The shape list is filled if an accessible shape is destroyed. It

    // simply keeps a reference to the accessible shape's XShape. These

    // references are destroyed within the EndAction when firing events.

    // There are two reason for this. First of all, a new accessible shape

    // for the XShape might be created soon. It's then cheaper if the XShape

    // still exists. The other reason are situations where an accessible shape

    // is destroyed within an SwFrameFormat::SwClientNotify. In this case, destroying

    // the XShape at the same time (indirectly by destroying the accessible

    // shape) leads to an assert, because a client of the Modify is destroyed

    // within a Modify call.

    std::vector<css::uno::Reference<css::drawing::XShape>> mvShapes;

    std::unique_ptr<SwAccessibleEventList_Impl> mpEvents;

    std::unique_ptr<SwAccessibleEventMap_Impl> mpEventMap;

    // Para Container for InvalidateCursorPosition

    o3tl::sorted_vector<SwAccessibleParagraph*> m_setParaAdd;

    o3tl::sorted_vector<SwAccessibleParagraph*> m_setParaRemove;

    // #i27301 data structure to keep information about

    // accessible paragraph, which have a selection.

    std::unique_ptr<SwAccessibleSelectedParas_Impl> mpSelectedParas;

    SwViewShell& m_rViewShell;

    /// for page preview: store preview data, VisArea, and mapping of

    /// preview-to-display coordinates

    std::unique_ptr<SwAccPreviewData> mpPreview;

    unotools::WeakReference< SwAccessibleContext > mxCursorContext;

    bool mbShapeSelected;

    void FireEvent( const SwAccessibleEvent_Impl& rEvent );

    void AppendEvent( const SwAccessibleEvent_Impl& rEvent );

    void InvalidateCursorPosition(const rtl::Reference<SwAccessibleContext>& rxAcc);

    void DoInvalidateShapeSelection(bool bInvalidateFocusMode = false);

    void InvalidateShapeSelection();

    //maSelectedFrameMap contains the old selected objects.

    SwAccessibleContextMap maSelectedFrameMap;

    OUString maDocName;

    //InvalidateShapeInParaSelection() method is responsible for the updating the selected states of the objects.

    void InvalidateShapeInParaSelection();

    void InvalidateRelationSet_(const SwFrame& rFrame, bool bFrom);

    rtl::Reference<SwAccessibleContext> GetDocumentView_(bool bPagePreview);

    /** method to build up a new data structure of the accessible paragraphs,

        which have a selection

        Important note: method has to used inside a mutual exclusive section

    */

    std::unique_ptr<SwAccessibleSelectedParas_Impl> BuildSelectedParas();

public:

    SwAccessibleMap(SwViewShell& rViewShell);

    virtual ~SwAccessibleMap() override;

    rtl::Reference<comphelper::OAccessible> GetDocumentView();

    rtl::Reference<comphelper::OAccessible>

    GetDocumentPreview(const std::vector<std::unique_ptr<PreviewPage>>& _rPreviewPages,

                       const Fraction& _rScale, const SwPageFrame* _pSelectedPageFrame,

                       const Size& _rPreviewWinSize);

    ::rtl::Reference < SwAccessibleContext > GetContextImpl(

                                                 const SwFrame *pFrame,

                                                bool bCreate = true );

    css::uno::Reference<css::accessibility::XAccessible> GetContext(

                                                 const SwFrame *pFrame,

                                                bool bCreate = true );

    ::rtl::Reference < ::accessibility::AccessibleShape > GetContextImpl(

                                        const SdrObject *pObj,

                                        SwAccessibleContext *pParentImpl,

                                        bool bCreate = true );

    css::uno::Reference<css::accessibility::XAccessible> GetContext(

                                        const SdrObject *pObj,

                                        SwAccessibleContext *pParentImpl,

                                        bool bCreate = true );

    SwViewShell& GetShell() const

    {

        return m_rViewShell;

    }

    static bool IsInSameLevel(const SdrObject* pObj, const SwFEShell* pFESh);

    void AddShapeContext(const SdrObject *pObj,

                             rtl::Reference < ::accessibility::AccessibleShape > const & xAccShape);

    void AddGroupContext(const SdrObject *pParentObj,

                    css::uno::Reference < css::accessibility::XAccessible > const & xAccParent);

    void RemoveGroupContext(const SdrObject *pParentObj);

    const SwRect& GetVisArea() const;

    /** get size of a dedicated preview page

        @param _nPreviewPageNum

        input parameter - physical page number of page visible in the page preview

        @return an object of class <Size>

    */

    Size GetPreviewPageSize( sal_uInt16 _nPreviewPageNum ) const;

    void RemoveContext( const SwFrame *pFrame );

    void RemoveContext( const SdrObject *pObj );

    // Dispose frame and its children if bRecursive is set

    void A11yDispose( const SwFrame* pFrame,

                      const SdrObject* pObj,

                      vcl::Window* pWindow,

                      bool bRecursive = false,

                      bool bCanSkipInvisible = true );

    void InvalidatePosOrSize( const SwFrame* pFrame,

                              const SdrObject* pObj,

                              vcl::Window* pWindow,

                              const SwRect& rOldFrame );

    void InvalidateContent( const SwFrame *pFrame );

    void InvalidateAttr( const SwTextFrame& rTextFrame );

    void InvalidateCursorPosition( const SwFrame *pFrame );

    void InvalidateFocus();

    void SetCursorContext(

        const ::rtl::Reference < SwAccessibleContext >& rCursorContext );

    // Invalidate state of whole tree. If an action is open, this call

    // is processed when the last action ends.

    void InvalidateEditableStates( const SwFrame* _pFrame );

    void InvalidateRelationSet(const SwFrame& rMaster, const SwFrame& rFollow);

    /** invalidation CONTENT_FLOWS_FROM/_TO relation of a paragraph

        @param _rTextFrame

        input parameter - reference to paragraph, whose CONTENT_FLOWS_FROM/_TO

        has to be invalidated.

        @param _bFrom

        input parameter - boolean indicating, if relation CONTENT_FLOWS_FROM

        (value <true>) or CONTENT_FLOWS_TO (value <false>) has to be invalidated.

    */

    void InvalidateParaFlowRelation( const SwTextFrame& _rTextFrame,

                                     const bool _bFrom );

    /** invalidation of text selection of a paragraph */

    void InvalidateParaTextSelection( const SwTextFrame& _rTextFrame );

    /** invalidation of text selection of all paragraphs */

    void InvalidateTextSelectionOfAllParas();

    sal_Int32 GetChildIndex( const SwFrame& rParentFrame,

                             vcl::Window& rChild ) const;

    // update preview data (and fire events if necessary)

    void UpdatePreview( const std::vector<std::unique_ptr<PreviewPage>>& _rPreviewPages,

                        const Fraction&  _rScale,

                        const SwPageFrame* _pSelectedPageFrame,

                        const Size&      _rPreviewWinSize );

    void InvalidatePreviewSelection( sal_uInt16 nSelPage );

    bool IsPageSelected( const SwPageFrame *pPageFrame ) const;

    void FireEvents();

    const OUString& GetDocName() const { return maDocName; }

    // IAccessibleViewForwarder

    virtual tools::Rectangle GetVisibleArea() const override;

    virtual Point LogicToPixel (const Point& rPoint) const override;

    virtual Size LogicToPixel (const Size& rSize) const override;

    // IAccessibleParent

    virtual bool ReplaceChild (

        ::accessibility::AccessibleShape* pCurrentChild,

        const css::uno::Reference< css::drawing::XShape >& _rxShape,

        const tools::Long _nIndex,

        const ::accessibility::AccessibleShapeTreeInfo& _rShapeTreeInfo

    ) override;

    virtual ::accessibility::AccessibleControlShape* GetAccControlShapeFromModel

        (css::beans::XPropertySet* pSet) override;

    virtual css::accessibility::XAccessible*   GetAccessibleCaption (

        const css::uno::Reference< css::drawing::XShape > & xShape) override;

    // additional Core/Pixel conversions for internal use; also works

    // for preview

    Point PixelToCore (const Point& rPoint) const;

    tools::Rectangle CoreToPixel (const SwRect& rRect) const;

    // is there a known accessibility impl cached for the frame

    bool Contains(const SwFrame *pFrame) const;

private:

    /** get mapping mode for LogicToPixel and PixelToLogic conversions

        Replacement method <PreviewAdjust(..)> by new method <GetMapMode>.

        Method returns mapping mode of current output device and adjusts it,

        if the shell is in page/print preview.

        Necessary, because <PreviewAdjust(..)> changes mapping mode at current

        output device for mapping logic document positions to page preview window

        positions and vice versa and doesn't take care to recover its changes.

        @param _rPoint

        input parameter - constant reference to point to determine the mapping

        mode adjustments for page/print preview.

        @return mapping mode, which is determined by the method

    */

    MapMode GetMapMode(const Point& _rPoint) const;

public:

    virtual bool IsDocumentSelAll() override;

};

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