/* -*- 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 <com/sun/star/accessibility/XAccessibleContext2.hpp>
#include <com/sun/star/accessibility/XAccessibleEventBroadcaster.hpp>
#include <com/sun/star/accessibility/XAccessibleExtendedComponent.hpp>
#include <comphelper/accessibleeventnotifier.hxx>
#include <cppuhelper/basemutex.hxx>
#include <cppuhelper/compbase.hxx>
#include <comphelper/comphelperdllapi.h>


namespace comphelper
{

/** Central helper/base class for implementing basic accessibility interfaces.
*/
class COMPHELPER_DLLPUBLIC OAccessible
    : public cppu::BaseMutex,
      public cppu::WeakComponentImplHelper<css::accessibility::XAccessible,
                                           css::accessibility::XAccessibleContext2,
                                           css::accessibility::XAccessibleEventBroadcaster,
                                           css::accessibility::XAccessibleExtendedComponent>
{
    friend class OContextEntryGuard;
private:
    AccessibleEventNotifier::TClientId m_nClientId;

protected:
    virtual ~OAccessible() override;

    OAccessible();

private:
    OAccessible(OAccessible const&) = delete;
    OAccessible(OAccessible&&) = delete;
    void operator=(OAccessible const&) = delete;
    void operator=(OAccessible&&) = delete;

public:
    // XAccessible
    virtual css::uno::Reference<com::sun::star::accessibility::XAccessibleContext>
        SAL_CALL getAccessibleContext() override final;

    // XAccessibleEventBroadcaster
    virtual void SAL_CALL addAccessibleEventListener( const css::uno::Reference< css::accessibility::XAccessibleEventListener >& xListener ) override;
    virtual void SAL_CALL removeAccessibleEventListener( const css::uno::Reference< css::accessibility::XAccessibleEventListener >& xListener ) override;

    // XAccessibleContext - still waiting to be overwritten
    virtual sal_Int64 SAL_CALL getAccessibleChildCount(  ) override = 0;
    virtual css::uno::Reference< css::accessibility::XAccessible > SAL_CALL getAccessibleChild( sal_Int64 i ) override = 0;
    virtual css::uno::Reference< css::accessibility::XAccessible > SAL_CALL getAccessibleParent(  ) override = 0;
    virtual sal_Int16 SAL_CALL getAccessibleRole(  ) override = 0;
    virtual OUString SAL_CALL getAccessibleDescription(  ) override = 0;
    virtual OUString SAL_CALL getAccessibleName(  ) override = 0;
    virtual css::uno::Reference< css::accessibility::XAccessibleRelationSet > SAL_CALL getAccessibleRelationSet(  ) override = 0;
    virtual sal_Int64 SAL_CALL getAccessibleStateSet(  ) override = 0;

    // XAccessibleContext2 - default implementation
    virtual OUString SAL_CALL getAccessibleId(  ) override;

    // XAccessibleContext - default implementations
    /** default implementation for retrieving the index of this object within the parent
        <p>This basic implementation here returns the index <code>i</code> of the child for which
            <code>&lt;parent&gt;.getAccessibleChild(i).getAccessibleContext()</code> returns
            a reference to this OAccessible object.</p>
    */
    virtual sal_Int64 SAL_CALL getAccessibleIndexInParent(  ) override;
    /** default implementation for retrieving the locale
        <p>This basic implementation returns the locale of the parent context,
        as retrieved via getAccessibleParent()->getAccessibleContext.</p>
    */
    virtual css::lang::Locale SAL_CALL getLocale(  ) override;

protected:
    // OComponentHelper
    virtual void SAL_CALL disposing() override;

protected:
    // helper
    /** notifies all AccessibleEventListeners of a certain event

    @precond    not to be called with our mutex locked
    @param  _nEventId
        the id of the event. See AccessibleEventType
    @param  _rOldValue
        the old value to be notified
    @param  _rNewValue
        the new value to be notified
    */
    void NotifyAccessibleEvent(
                const sal_Int16 _nEventId,
                const css::uno::Any& _rOldValue,
                const css::uno::Any& _rNewValue,
                sal_Int32 nIndexHint = -1
            );

    /// returns whether any accessible listeners are registered
    bool hasAccessibleListeners() const;

    // life time control
    /// checks whether the object is alive (returns <TRUE/> then) or disposed
    bool    isAlive() const;
    /// checks for being alive. If the object is already disposed (i.e. not alive), an exception is thrown.
    void        ensureAlive() const;

    /** ensures that the object is disposed.
    @precond
        to be called from within the destructor of your derived class only!
    */
    void        ensureDisposed( );

    /** shortcut for retrieving the context of the parent (returned by getAccessibleParent)
    */
    css::uno::Reference< css::accessibility::XAccessibleContext >
                implGetParentContext();

    // access to the base class' broadcast helper/mutex
    ::osl::Mutex&                   GetMutex()                  { return m_aMutex; }

protected:
    /// implements the calculation of the bounding rectangle - still waiting to be overwritten
    ///
    /// @throws css::uno::RuntimeException
    virtual css::awt::Rectangle implGetBounds(  ) = 0;


public:
    // XAccessibleComponent - default implementations which can be implemented using <method>implGetBounds</method>
    virtual sal_Bool SAL_CALL containsPoint( const css::awt::Point& aPoint ) override final;
    virtual css::awt::Point SAL_CALL getLocation(  ) override final;
    /* note: getLocationOnScreen relies on a valid parent (XAccessibleContext::getParent()->getAccessibleContext()),
       which itself implements XAccessibleComponent

        @throws css::uno::RuntimeException
    */
    virtual css::awt::Point SAL_CALL getLocationOnScreen(  ) override;
    virtual css::awt::Size SAL_CALL getSize(  ) override final;
    virtual css::awt::Rectangle SAL_CALL getBounds(  ) override final;

    // XAccessibleExtendedComponent - default implementations returning empty strings
    virtual OUString SAL_CALL getTitledBorderText() override;
    virtual OUString SAL_CALL getToolTipText() override;
};

}   // namespace comphelper


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