/* -*- 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 .
 */

#pragma once

#include "accframe.hxx"
#include <accmap.hxx>
#include <com/sun/star/accessibility/XAccessibleComponent.hpp>
#include <com/sun/star/accessibility/XAccessibleContext3.hpp>
#include <com/sun/star/accessibility/XAccessibleEventBroadcaster.hpp>
#include <cppuhelper/implbase.hxx>
#include <unotools/resmgr.hxx>

#include <memory>
#include <mutex>

namespace vcl { class Window; }
class SwCursorShell;
class SdrObject;
class SwPaM;
namespace accessibility {
    class AccessibleShape;
}

class SwAccessibleContext
    : public cppu::ImplInheritanceHelper<comphelper::OAccessible,
                                         css::accessibility::XAccessibleContext3>,
      public SwAccessibleFrame
{
    // The implements for the XAccessibleSelection interface has been
    // 'externalized' and wants access to the protected members like
    // GetMap, GetChild, GetParent, and GetFrame.
    friend class SwAccessibleSelectionHelper;
#if OSL_DEBUG_LEVEL > 0
    friend class SwAccessibleMap;
#endif

protected:
    mutable std::mutex m_Mutex;

private:
    OUString m_sName;  // immutable outside constructor

    // The parent if it has been retrieved. (protected by Mutex)
    unotools::WeakReference< SwAccessibleContext > m_xWeakParent;

    SwAccessibleMap *m_pMap; // must be protected by solar mutex
    /// note: the m_pMap is guaranteed to be valid until we hit the
    /// dtor ~SwAccessibleContext, then m_wMap must be checked if it's still
    /// alive, after locking SolarMutex (alternatively, Dispose clears m_pMap)
    std::weak_ptr<SwAccessibleMap> m_wMap;

    sal_Int16 m_nRole;        // immutable outside constructor

    // The current states (protected by mutex)
    bool m_isShowingState : 1;
    bool m_isEditableState : 1;
    bool m_isOpaqueState : 1;
    bool m_isDefuncState : 1;

    // Are we currently disposing that object (protected by solar mutex)?
    bool m_isDisposing : 1;

    // #i85634# - boolean, indicating if the accessible context is
    // in general registered at the accessible map.
    bool m_isRegisteredAtAccessibleMap;

protected:
    void SetName( const OUString& rName ) { m_sName = rName; }
    sal_Int16 GetRole() const
    {
        return m_nRole;
    }
    //This flag is used to mark the object's selected state.
    bool   m_isSelectedInDoc;
    void SetParent( SwAccessibleContext *pParent );
    rtl::Reference<SwAccessibleContext> GetWeakParent() const;

    bool IsDisposing() const { return m_isDisposing; }

    vcl::Window *GetWindow();
    SwAccessibleMap *GetMap() { return m_pMap; }
    const SwAccessibleMap *GetMap() const { return m_pMap; }

    /** convenience method to get the SwViewShell through accessibility map */
    SwViewShell& GetShell()
    {
        return GetMap()->GetShell();
    }
    const SwViewShell& GetShell() const
    {
        return GetMap()->GetShell();
    }

    /** convenience method to get SwCursorShell through accessibility map
     * @returns SwCursorShell, or NULL if none is found */
    SwCursorShell* GetCursorShell();
    const SwCursorShell* GetCursorShell() const;

    // Notify all children that the visible area has changed.
    // The SwFrame might belong to the current object or to any other child or
    // grandchild.
    void ChildrenScrolled( const SwFrame *pFrame, const SwRect& rOldVisArea );

    // The context's showing state changed. May only be called for context that
    // exist even if they aren't visible.
    void Scrolled( const SwRect& rOldVisArea );

    // A child has been moved while setting the visible area
    void ScrolledWithin( const SwRect& rOldVisArea );

    // The has been added while setting the visible area
    void ScrolledIn();

    // The context has to be removed while setting the visible area
    void ScrolledOut( const SwRect& rOldVisArea );

    // Invalidate the states of all children of the specified SwFrame. The
    // SwFrame might belong the current object or to any child or grandchild!
    // #i27301# - use new type definition for <_nStates>
    void InvalidateChildrenStates( const SwFrame* _pFrame,
                                   AccessibleStates _nStates );

    // Dispose children of the specified SwFrame. The SwFrame might belong to
    // the current object or to any other child or grandchild.
    void DisposeChildren(const SwFrame *pFrame,
                         bool bRecursive, bool bCanSkipInvisible);

    void DisposeShape( const SdrObject *pObj,
                                ::accessibility::AccessibleShape *pAccImpl );
    void ScrolledInShape( ::accessibility::AccessibleShape *pAccImpl );

    virtual void InvalidateContent_( bool bVisibleDataFired );

    virtual void InvalidateCursorPos_();
    virtual void InvalidateFocus_();

public:
    void FireAccessibleEvent(const sal_Int16 nEventId, const css::uno::Any& rOldValue,
                             const css::uno::Any& rNewValue, sal_Int32 nIndexHint = -1);

protected:
    // OAccessible
    virtual css::awt::Rectangle implGetBounds() override;

    // broadcast visual data event
    void FireVisibleDataEvent();

    // broadcast state change event
    void FireStateChangedEvent( sal_Int64 nState, bool bNewState );

    // Set states for getAccessibleStateSet.
    // This base class sets DEFUNC(0/1), EDITABLE(0/1), ENABLED(1),
    // SHOWING(0/1), OPAQUE(0/1) and VISIBLE(1).
    virtual void GetStates( sal_Int64& rStateSet );

     bool IsEditableState();

    /// @throws css::uno::RuntimeException
    css::awt::Rectangle
        getBoundsImpl(bool bRelative);

    // #i85634#
    void NotRegisteredAtAccessibleMap()
    {
        m_isRegisteredAtAccessibleMap = false;
    }
    void RemoveFrameFromAccessibleMap();

    void ThrowIfDisposed();

    virtual ~SwAccessibleContext() override;

    // Return a reference to the parent.
    rtl::Reference<SwAccessibleContext> getAccessibleParentImpl();

public:
    SwAccessibleContext( std::shared_ptr<SwAccessibleMap> const& pMap,
                         sal_Int16 nRole, const SwFrame *pFrame );

    // XAccessibleContext

    // Return the number of currently visible children.
    virtual sal_Int64 SAL_CALL getAccessibleChildCount() override;

    // Return the specified child or NULL if index is invalid.
    virtual css::uno::Reference< css::accessibility::XAccessible> SAL_CALL
        getAccessibleChild (sal_Int64 nIndex) override;

    virtual css::uno::Sequence<css::uno::Reference< css::accessibility::XAccessible>> SAL_CALL
        getAccessibleChildren() override;

    // Return a reference to the parent.
    virtual css::uno::Reference< css::accessibility::XAccessible> SAL_CALL
        getAccessibleParent() override;

    // Return this objects index among the parents children.
    virtual sal_Int64 SAL_CALL
        getAccessibleIndexInParent() override;

    // Return this object's role.
    virtual sal_Int16 SAL_CALL
        getAccessibleRole() override;

    // getAccessibleDescription() is abstract

    // Return the object's current name.
    virtual OUString SAL_CALL
        getAccessibleName() override;

    // Return NULL to indicate that an empty relation set.
    virtual css::uno::Reference<
            css::accessibility::XAccessibleRelationSet> SAL_CALL
        getAccessibleRelationSet() override;

    // Return the set of current states.
    virtual sal_Int64 SAL_CALL getAccessibleStateSet() override;

    /** Return the parents locale or throw exception if this object has no
        parent yet/anymore. */
    virtual css::lang::Locale SAL_CALL
        getLocale() override;

    // XAccessibleComponent
    virtual css::uno::Reference< css::accessibility::XAccessible > SAL_CALL getAccessibleAtPoint(
                const css::awt::Point& aPoint ) override;

    virtual css::awt::Point SAL_CALL getLocationOnScreen() override;

    virtual void SAL_CALL grabFocus() override;

    virtual sal_Int32 SAL_CALL getForeground() override;
    virtual sal_Int32 SAL_CALL getBackground() override;

    // thread safe C++ interface

    // The object is not visible any longer and should be destroyed
    virtual void Dispose(bool bRecursive, bool bCanSkipInvisible = true);

    // The child object is not visible any longer and should be destroyed
    virtual void DisposeChild(const sw::access::SwAccessibleChild& rFrameOrObj, bool bRecursive, bool bCanSkipInvisible);

    // The object has been moved by the layout
    virtual void InvalidatePosOrSize( const SwRect& rFrame );

    // The child object has been moved by the layout
    virtual void InvalidateChildPosOrSize( const sw::access::SwAccessibleChild& rFrameOrObj,
                                           const SwRect& rFrame );

    // The content may have changed (but it hasn't to have changed)
    void InvalidateContent();

    // The caretPos has changed
    void InvalidateCursorPos();

    // The Focus state has changed
    void InvalidateFocus();

    // Check states
    // #i27301# - use new type definition for <_nStates>
    void InvalidateStates( AccessibleStates _nStates );

    // the XAccessibleRelationSet may have changed
    void InvalidateRelation( sal_uInt16 nType );

    void InvalidateTextSelection(); // #i27301# - text selection has changed
    void InvalidateAttr(); // #i88069# - attributes has changed

    bool HasAdditionalAccessibleChildren();

    // #i88070# - get additional child by index
    vcl::Window* GetAdditionalAccessibleChild( const sal_Int32 nIndex );

    // #i88070# - get all additional accessible children
    std::vector<vcl::Window*> GetAdditionalAccessibleChildren();

    const OUString& GetName() const { return m_sName; }

    virtual bool HasCursor();   // required by map to remember that object

    bool Select( SwPaM *pPaM, SdrObject *pObj, bool bAdd );
    bool Select( SwPaM& rPaM )
    {
        return Select( &rPaM, nullptr, false );
    }
    bool Select( SdrObject *pObj, bool bAdd )
    {
        return Select( nullptr, pObj, bAdd );
    }

    //This method is used to update the selected state and fire the selected state changed event.
    virtual bool SetSelectedState(bool bSelected);
    bool  IsSelectedInDoc() const { return m_isSelectedInDoc; }

    bool IsDisposed() const;

    static OUString GetResource(TranslateId pResId,
                                const OUString *pArg1 = nullptr,
                                const OUString *pArg2 = nullptr);
};

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