/* -*- 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 <sal/config.h>

#include <cassert>

#include <com/sun/star/beans/NamedValue.hpp>

#include <com/sun/star/beans/PropertyValue.hpp>

#include <com/sun/star/configuration/theDefaultProvider.hpp>

#include <com/sun/star/lang/EventObject.hpp>

#include <com/sun/star/lang/Locale.hpp>

#include <com/sun/star/lang/XLocalizable.hpp>

#include <com/sun/star/lang/XMultiServiceFactory.hpp>

#include <com/sun/star/lang/XServiceInfo.hpp>

#include <com/sun/star/uno/Any.hxx>

#include <com/sun/star/uno/Exception.hpp>

#include <com/sun/star/uno/Reference.hxx>

#include <com/sun/star/uno/Sequence.hxx>

#include <com/sun/star/uno/XInterface.hpp>

#include <com/sun/star/util/XFlushListener.hpp>

#include <com/sun/star/util/XFlushable.hpp>

#include <com/sun/star/util/XRefreshListener.hpp>

#include <com/sun/star/util/XRefreshable.hpp>

#include <comphelper/compbase.hxx>

#include <cppuhelper/supportsservice.hxx>

#include <cppuhelper/weak.hxx>

#include <osl/mutex.hxx>

#include <sal/types.h>

#include <rtl/ref.hxx>

#include <rtl/ustring.hxx>

#include <i18nlangtag/languagetag.hxx>

#include <utility>

#include "components.hxx"

#include "configurationprovider.hxx"

#include "lock.hxx"

#include "defaultprovider.hxx"

#include "rootaccess.hxx"

namespace configmgr::configuration_provider {

namespace {

constexpr OUString accessServiceName =

    u"com.sun.star.configuration.ConfigurationAccess"_ustr;

constexpr OUString updateAccessServiceName =

    u"com.sun.star.configuration.ConfigurationUpdateAccess"_ustr;

void badNodePath() {

    throw css::uno::Exception(

        (u"com.sun.star.configuration.ConfigurationProvider expects a single,"

         " non-empty, string nodepath argument"_ustr),

        nullptr);

}

typedef

    comphelper::WeakComponentImplHelper<

        css::lang::XServiceInfo, css::lang::XMultiServiceFactory,

        css::util::XRefreshable, css::util::XFlushable,

        css::lang::XLocalizable >

    ServiceBase;

class Service : public ServiceBase

{

public:

    explicit Service(

        const css::uno::Reference< css::uno::XComponentContext >& context):

        context_(context), default_(true),

        lock_( lock() )

    {

        assert(context.is());

    }

    Service(

        const css::uno::Reference< css::uno::XComponentContext >& context,

        OUString locale):

        context_(context), locale_(std::move(locale)),

        default_(false),

        lock_( lock() )

    {

        assert(context.is());

    }

private:

    Service(const Service&) = delete;

    Service& operator=(const Service&) = delete;

    virtual ~Service() override {}

    virtual void disposing(std::unique_lock<std::mutex>& rGuard) override;

    virtual OUString SAL_CALL getImplementationName() override

    {

        return default_

            ? default_provider::getImplementationName()

            : u"com.sun.star.comp.configuration.ConfigurationProvider"_ustr;

    }

    virtual sal_Bool SAL_CALL supportsService(OUString const & ServiceName) override

    { return cppu::supportsService(this, ServiceName); }

    virtual css::uno::Sequence< OUString > SAL_CALL

    getSupportedServiceNames() override

    {

        return default_

            ? default_provider::getSupportedServiceNames()

            : css::uno::Sequence<OUString> { u"com.sun.star.configuration.ConfigurationProvider"_ustr };

    }

    virtual css::uno::Reference< css::uno::XInterface > SAL_CALL createInstance(

        OUString const & aServiceSpecifier) override;

    virtual css::uno::Reference< css::uno::XInterface > SAL_CALL

    createInstanceWithArguments(

        OUString const & ServiceSpecifier,

        css::uno::Sequence< css::uno::Any > const & Arguments) override;

    virtual css::uno::Sequence< OUString > SAL_CALL

    getAvailableServiceNames() override;

    virtual void SAL_CALL refresh() override;

    virtual void SAL_CALL addRefreshListener(

        css::uno::Reference< css::util::XRefreshListener > const & l) override;

    virtual void SAL_CALL removeRefreshListener(

        css::uno::Reference< css::util::XRefreshListener > const & l) override;

    virtual void SAL_CALL flush() override;

    virtual void SAL_CALL addFlushListener(

        css::uno::Reference< css::util::XFlushListener > const & l) override;

    virtual void SAL_CALL removeFlushListener(

        css::uno::Reference< css::util::XFlushListener > const & l) override;

    virtual void SAL_CALL setLocale(css::lang::Locale const & eLocale) override;

    virtual css::lang::Locale SAL_CALL getLocale() override;

    void flushModifications() const;

    css::uno::Reference< css::uno::XComponentContext > context_;

    OUString locale_;

    bool default_;

    std::shared_ptr<osl::Mutex> lock_;

    comphelper::OInterfaceContainerHelper4<css::util::XRefreshListener> maRefreshListeners;

    comphelper::OInterfaceContainerHelper4<css::util::XFlushListener> maFlushListeners;

};

css::uno::Reference< css::uno::XInterface > Service::createInstance(

    OUString const & aServiceSpecifier)

{

    return createInstanceWithArguments(

        aServiceSpecifier, css::uno::Sequence< css::uno::Any >());

}

css::uno::Reference< css::uno::XInterface >

Service::createInstanceWithArguments(

    OUString const & ServiceSpecifier,

    css::uno::Sequence< css::uno::Any > const & Arguments)

{

    OUString nodepath;

    OUString locale;

    for (sal_Int32 i = 0; i < Arguments.getLength(); ++i) {

        css::beans::NamedValue v1;

        css::beans::PropertyValue v2;

        OUString name;

        css::uno::Any value;

        if (Arguments[i] >>= v1) {

            name = v1.Name;

            value = v1.Value;

        } else if (Arguments[i] >>= v2) {

            name = v2.Name;

            value = v2.Value;

        } else if (Arguments.getLength() == 1 && (Arguments[i] >>= nodepath)) {

            // For backwards compatibility, allow a single string argument that

            // denotes nodepath.

            if (nodepath.isEmpty()) {

                badNodePath();

            }

            break;

        } else {

            throw css::uno::Exception(

                (u"com.sun.star.configuration.ConfigurationProvider expects"

                 " NamedValue or PropertyValue arguments"_ustr),

                nullptr);

        }

        // For backwards compatibility, allow "nodepath" and "Locale" in any

        // case:

        if (name.equalsIgnoreAsciiCase("nodepath")) {

            if (!nodepath.isEmpty() || !(value >>= nodepath) ||

                nodepath.isEmpty())

            {

                badNodePath();

            }

        } else if (name.equalsIgnoreAsciiCase("locale")) {

            if (!locale.isEmpty() || !(value >>= locale) ||

                locale.isEmpty())

            {

                throw css::uno::Exception(

                    (u"com.sun.star.configuration.ConfigurationProvider expects"

                     " at most one, non-empty, string Locale argument"_ustr),

                    nullptr);

            }

        }

    }

    if (nodepath.isEmpty()) {

        badNodePath();

    }

    // For backwards compatibility, allow a nodepath that misses the leading

    // slash:

    if (nodepath[0] != '/') {

        nodepath = "/" + nodepath;

    }

    if (locale.isEmpty()) {

        //TODO: should the Access use the dynamically changing locale_ instead?

        locale = locale_;

        if (locale.isEmpty()) {

            locale = "en-US";

        }

    }

    bool update;

    if (ServiceSpecifier == accessServiceName) {

        update = false;

    } else if (ServiceSpecifier == updateAccessServiceName) {

        update = true;

    } else {

        throw css::uno::Exception(

            ("com.sun.star.configuration.ConfigurationProvider does not support"

             " service " + ServiceSpecifier),

            getXWeak());

    }

    osl::MutexGuard guard(*lock_);

    Components & components = Components::getSingleton(context_);

    rtl::Reference root(

        new RootAccess(components, nodepath, locale, update));

    if (root->isValue()) {

        throw css::uno::Exception(

            ("com.sun.star.configuration.ConfigurationProvider: there is a leaf"

             " value at nodepath " + nodepath),

            getXWeak());

    }

    components.addRootAccess(root);

    return root->getXWeak();

}

css::uno::Sequence< OUString > Service::getAvailableServiceNames()

{

    return { accessServiceName, updateAccessServiceName };

}

void Service::refresh() {

    //TODO

    std::unique_lock g(m_aMutex);

    if (maRefreshListeners.getLength(g)) {

        css::lang::EventObject ev(getXWeak());

        maRefreshListeners.notifyEach(g, &css::util::XRefreshListener::refreshed, ev);

    }

}

void Service::addRefreshListener(

    css::uno::Reference< css::util::XRefreshListener > const & l)

{

    std::unique_lock g(m_aMutex);

    maRefreshListeners.addInterface(g, l);

}

void Service::removeRefreshListener(

    css::uno::Reference< css::util::XRefreshListener > const & l)

{

    std::unique_lock g(m_aMutex);

    maRefreshListeners.removeInterface(g, l);

}

void Service::flush() {

    flushModifications();

    std::unique_lock g(m_aMutex);

    if (maFlushListeners.getLength(g)) {

        css::lang::EventObject ev(getXWeak());

        maFlushListeners.notifyEach(g, &css::util::XFlushListener::flushed, ev);

    }

}

void Service::addFlushListener(

    css::uno::Reference< css::util::XFlushListener > const & l)

{

    std::unique_lock g(m_aMutex);

    maFlushListeners.addInterface(g, l);

}

void Service::removeFlushListener(

    css::uno::Reference< css::util::XFlushListener > const & l)

{

    std::unique_lock g(m_aMutex);

    maFlushListeners.removeInterface(g, l);

}

void Service::setLocale(css::lang::Locale const & eLocale)

{

    osl::MutexGuard guard(*lock_);

    locale_ = LanguageTag::convertToBcp47( eLocale, false);

}

css::lang::Locale Service::getLocale() {

    osl::MutexGuard guard(*lock_);

    css::lang::Locale loc;

    if (! locale_.isEmpty()) {

        loc = LanguageTag::convertToLocale( locale_, false);

    }

    return loc;

}

void Service::disposing(std::unique_lock<std::mutex>& rGuard) {

    rGuard.unlock(); // just in case we call back into Service during dispose()

    flushModifications();

    rGuard.lock();

}

void Service::flushModifications() const {

    Components * components;

    {

        osl::MutexGuard guard(*lock_);

        components = &Components::getSingleton(context_);

    }

    components->flushModifications();

}

extern "C" SAL_DLLPUBLIC_EXPORT css::uno::XInterface*

com_sun_star_comp_configuration_ConfigurationProvider_get_implementation(

    css::uno::XComponentContext* Context, css::uno::Sequence<css::uno::Any> const& Arguments)

{

    if (!Arguments.hasElements()) {

        auto p = css::configuration::theDefaultProvider::get(Context);

        p->acquire();

        return p.get();

    } else {

        OUString locale;

        for (sal_Int32 i = 0; i < Arguments.getLength(); ++i) {

            css::beans::NamedValue v1;

            css::beans::PropertyValue v2;

            OUString name;

            css::uno::Any value;

            if (Arguments[i] >>= v1) {

                name = v1.Name;

                value = v1.Value;

            } else if (Arguments[i] >>= v2) {

                name = v2.Name;

                value = v2.Value;

            } else {

                throw css::uno::Exception(

                    (u"com.sun.star.configuration.ConfigurationProvider factory"

                     " expects NamedValue or PropertyValue arguments"_ustr),

                    nullptr);

            }

            // For backwards compatibility, allow "Locale" and (ignored)

            // "EnableAsync" in any case:

            if (name.equalsIgnoreAsciiCase("locale")) {

                if (!locale.isEmpty() || !(value >>= locale) ||

                    locale.isEmpty())

                {

                    throw css::uno::Exception(

                        (u"com.sun.star.configuration.ConfigurationProvider"

                         " factory expects at most one, non-empty, string"

                         " Locale argument"_ustr),

                        nullptr);

                }

            } else if (!name.equalsIgnoreAsciiCase("enableasync")) {

                throw css::uno::Exception(

                    ("com.sun.star.configuration.ConfigurationProvider factory:"

                     " unknown argument " + name),

                    nullptr);

            }

        }

        return cppu::acquire(new Service(Context, locale));

    }

}

}

css::uno::Reference< css::uno::XInterface > createDefault(

    css::uno::Reference< css::uno::XComponentContext > const & context)

{

    return getXWeak(new Service(context));

}

}

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