/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4; fill-column: 100 -*- */
/*
 * This file is part of the Collabora Office 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/.
 */

#pragma once

#include <sal/config.h>

#include <comphelper/comphelperdllapi.h>
#include <comphelper/interfacecontainer4.hxx>
#include <comphelper/unoimplbase.hxx>
#include <cppuhelper/weak.hxx>
#include <cppuhelper/implbase.hxx>
#include <com/sun/star/lang/XComponent.hpp>
#include <com/sun/star/lang/XTypeProvider.hpp>
#include <mutex>

namespace comphelper
{
/**
    Serves two purposes
    (1) extracts code that doesn't need to be templated
    (2) helps to handle the custom where we have conflicting interfaces
        e.g. multiple UNO interfaces that extend css::lang::XComponent
*/
class COMPHELPER_DLLPUBLIC WeakComponentImplHelperBase : public virtual comphelper::UnoImplBase,
                                                         public cppu::OWeakObject,
                                                         public css::lang::XComponent
{
public:
    virtual ~WeakComponentImplHelperBase() override;

    // css::lang::XComponent
    virtual void dispose() override;
    virtual void
    addEventListener(css::uno::Reference<css::lang::XEventListener> const& rxListener) override;
    virtual void
    removeEventListener(css::uno::Reference<css::lang::XEventListener> const& rxListener) override;

    virtual cpo::uno::Any queryInterface(cpo::uno::Type const& rType) override;

    /**
        Called by dispose for subclasses to do dispose() work.
        The mutex is held when called, and subclasses can unlock() the guard if necessary.
     */
    virtual void disposing(std::unique_lock<std::mutex>&);

protected:
    void throwIfDisposed(std::unique_lock<std::mutex>&)
    {
        if (m_bDisposed)
            throw css::lang::DisposedException(OUString(), static_cast<cppu::OWeakObject*>(this));
    }
    // only to be called from the destructor, to run the dispose logic, if necessary
    void disposeOnDestruct();

    comphelper::OInterfaceContainerHelper4<css::lang::XEventListener> maEventListeners;
};

template <typename... Ifc>
class SAL_DLLPUBLIC_TEMPLATE WeakComponentImplHelper : public WeakComponentImplHelperBase,
                                                       public css::lang::XTypeProvider,
                                                       public Ifc...
{
public:
    virtual void acquire() noexcept override { OWeakObject::acquire(); }

    virtual void release() noexcept override { OWeakObject::release(); }

    // css::lang::XComponent
    virtual void dispose() noexcept final override { WeakComponentImplHelperBase::dispose(); }
    virtual void addEventListener(
        css::uno::Reference<css::lang::XEventListener> const& rxListener) final override
    {
        WeakComponentImplHelperBase::addEventListener(rxListener);
    }
    virtual void removeEventListener(
        css::uno::Reference<css::lang::XEventListener> const& rxListener) final override
    {
        WeakComponentImplHelperBase::removeEventListener(rxListener);
    }

    virtual cpo::uno::Any queryInterface(cpo::uno::Type const& rType) override
    {
        return WeakComponentImplHelper_query(rType, class_data_get(), this);
    }

    // css::lang::XTypeProvider
    virtual cpo::uno::Sequence<cpo::uno::Type> getTypes() override
    {
        static const cpo::uno::Sequence<cpo::uno::Type> aTypeList{
            cppu::UnoType<cpo::uno::XWeak>::get(), cppu::UnoType<css::lang::XComponent>::get(),
            cppu::UnoType<css::lang::XTypeProvider>::get(), cppu::UnoType<Ifc>::get()...
        };
        return aTypeList;
    }
    virtual cpo::uno::Sequence<sal_Int8> getImplementationId() override
    {
        return cpo::uno::Sequence<sal_Int8>();
    }

private:
    static cppu::class_data* class_data_get()
    {
        return cppu::detail::ImplClassData<WeakComponentImplHelper, Ifc...>{}();
    }
};

/** WeakComponentImplHelper
*/
COMPHELPER_DLLPUBLIC cpo::uno::Any
WeakComponentImplHelper_query(cpo::uno::Type const& rType, cppu::class_data* cd,
                              WeakComponentImplHelperBase* pBase);

/**
    Serves two purposes
    (1) extracts code that doesn't need to be templated
    (2) helps to handle the custom where we have conflicting interfaces
        e.g. multiple UNO interfaces that extend css::uno::XInterface
*/
class COMPHELPER_DLLPUBLIC WeakImplHelperBase : public virtual comphelper::UnoImplBase,
                                                public cppu::OWeakObject
{
public:
    virtual ~WeakImplHelperBase() override;
};

template <typename... Ifc>
class SAL_DLLPUBLIC_TEMPLATE WeakImplHelper : public WeakImplHelperBase,
                                              public css::lang::XTypeProvider,
                                              public Ifc...
{
public:
    virtual void acquire() noexcept override { OWeakObject::acquire(); }

    virtual void release() noexcept override { OWeakObject::release(); }

    virtual cpo::uno::Any queryInterface(cpo::uno::Type const& rType) override
    {
        return WeakImplHelper_query(rType, class_data_get(), this);
    }

    // css::lang::XTypeProvider
    virtual cpo::uno::Sequence<cpo::uno::Type> getTypes() override
    {
        static const cpo::uno::Sequence<cpo::uno::Type> aTypeList{
            cppu::UnoType<cpo::uno::XWeak>::get(), cppu::UnoType<css::lang::XTypeProvider>::get(),
            cppu::UnoType<Ifc>::get()...
        };
        return aTypeList;
    }
    virtual cpo::uno::Sequence<sal_Int8> getImplementationId() override
    {
        return cpo::uno::Sequence<sal_Int8>();
    }

private:
    static cppu::class_data* class_data_get()
    {
        return cppu::detail::ImplClassData<WeakImplHelper, Ifc...>{}();
    }
};

/** WeakImplHelper
*/
COMPHELPER_DLLPUBLIC cpo::uno::Any
WeakImplHelper_query(cpo::uno::Type const& rType, cppu::class_data* cd, WeakImplHelperBase* pBase);

} //  namespace comphelper

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