/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
 * 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/.
 *
 * 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 <com/sun/star/beans/IllegalTypeException.hpp>
#include <com/sun/star/beans/PropertyExistException.hpp>
#include <com/sun/star/beans/XPropertyAccess.hpp>
#include <com/sun/star/container/XNameAccess.hpp>
#include <com/sun/star/container/XNamed.hpp>
#include <com/sun/star/ucb/Store.hpp>
#include <com/sun/star/ucb/XPropertySetRegistry.hpp>
#include <com/sun/star/ucb/XPropertySetRegistryFactory.hpp>
#include <cppuhelper/supportsservice.hxx>
#include <ucbhelper/contenthelper.hxx>
#include <ucbhelper/providerhelper.hxx>

#include <osl/diagnose.h>
#include <osl/mutex.hxx>
#include <cppuhelper/weakref.hxx>

#include <unordered_map>
#include <utility>

using namespace com::sun::star;

namespace ucbhelper_impl
{

typedef std::unordered_map
<
    OUString,
    cpo::uno::WeakReference< ucb::XContent >
>
Contents;

struct ContentProviderImplHelper_Impl
{
    uno::Reference< css::ucb::XPropertySetRegistry >  m_xPropertySetRegistry;
    Contents                                          m_aContents;
};

} // namespace ucbhelper_impl

namespace ucbhelper {

ContentProviderImplHelper::ContentProviderImplHelper(
    uno::Reference< uno::XComponentContext > xContext )
: m_pImpl( new ucbhelper_impl::ContentProviderImplHelper_Impl ),
  m_xContext(std::move( xContext ))
{
}

// virtual
ContentProviderImplHelper::~ContentProviderImplHelper()
{
}

// virtual
bool SAL_CALL ContentProviderImplHelper::supportsService(
                                            const OUString& ServiceName )
{
    return cppu::supportsService(this, ServiceName);
}

// virtual
sal_Int32 SAL_CALL ContentProviderImplHelper::compareContentIds(
        const uno::Reference< css::ucb::XContentIdentifier >& Id1,
        const uno::Reference< css::ucb::XContentIdentifier >& Id2 )
{
    // Simply do a string compare.

    OUString aURL1( Id1->getContentIdentifier() );
    OUString aURL2( Id2->getContentIdentifier() );

    return aURL1.compareTo( aURL2 );
}

void ContentProviderImplHelper::cleanupRegisteredContents()
{
    osl::MutexGuard aGuard( m_aMutex );

    ucbhelper_impl::Contents::iterator it
        = m_pImpl->m_aContents.begin();
    while( it != m_pImpl->m_aContents.end() )
    {
        uno::Reference< ucb::XContent > xContent( (*it).second );
        if ( !xContent.is() )
        {
            ucbhelper_impl::Contents::iterator tmp = it;
            ++it;
            m_pImpl->m_aContents.erase( tmp );
        }
        else
        {
            ++it;
        }
    }
}

void ContentProviderImplHelper::removeContent( ContentImplHelper* pContent )
{
    osl::MutexGuard aGuard( m_aMutex );

    cleanupRegisteredContents();

    const OUString aURL(
        pContent->getIdentifier()->getContentIdentifier() );

    ucbhelper_impl::Contents::iterator it = m_pImpl->m_aContents.find( aURL );

    if ( it != m_pImpl->m_aContents.end() )
        m_pImpl->m_aContents.erase( it );
}

rtl::Reference< ContentImplHelper >
ContentProviderImplHelper::queryExistingContent(
    const uno::Reference< css::ucb::XContentIdentifier >& Identifier )
{
    return queryExistingContent( Identifier->getContentIdentifier() );
}

rtl::Reference< ContentImplHelper >
ContentProviderImplHelper::queryExistingContent( const OUString& rURL )
{
    osl::MutexGuard aGuard( m_aMutex );

    cleanupRegisteredContents();

    // Check, if a content with given id already exists...

    ucbhelper_impl::Contents::const_iterator it
        = m_pImpl->m_aContents.find( rURL );
    if ( it != m_pImpl->m_aContents.end() )
    {
        uno::Reference< ucb::XContent > xContent( (*it).second );
        if ( xContent.is() )
        {
            return rtl::Reference< ContentImplHelper >(
                static_cast< ContentImplHelper * >( xContent.get() ) );
        }
    }
    return rtl::Reference< ContentImplHelper >();
}

void ContentProviderImplHelper::queryExistingContents(
        ContentRefList& rContents )
{
    osl::MutexGuard aGuard( m_aMutex );

    cleanupRegisteredContents();

    for ( const auto& rContent : m_pImpl->m_aContents )
    {
        uno::Reference< ucb::XContent > xContent( rContent.second );
        if ( xContent.is() )
        {
            rContents.emplace_back(
                    static_cast< ContentImplHelper * >( xContent.get() ) );
        }
    }
}

void ContentProviderImplHelper::registerNewContent(
    const uno::Reference< ucb::XContent > & xContent )
{
    if ( !xContent.is() )
        return;

    osl::MutexGuard aGuard( m_aMutex );

    cleanupRegisteredContents();

    const OUString aURL(
        xContent->getIdentifier()->getContentIdentifier() );
    ucbhelper_impl::Contents::const_iterator it
        = m_pImpl->m_aContents.find( aURL );
    if ( it == m_pImpl->m_aContents.end() )
        m_pImpl->m_aContents[ aURL ] = xContent;
}

uno::Reference< css::ucb::XPropertySetRegistry >
ContentProviderImplHelper::getAdditionalPropertySetRegistry()
{
    // Get propertyset registry.

    osl::MutexGuard aGuard( m_aMutex );

    if ( !m_pImpl->m_xPropertySetRegistry.is() )
    {
        uno::Reference< css::ucb::XPropertySetRegistryFactory >
            xRegFac = css::ucb::Store::create( m_xContext );

        // Open/create a registry.
        m_pImpl->m_xPropertySetRegistry
            = xRegFac->createPropertySetRegistry( OUString() );

        OSL_ENSURE( m_pImpl->m_xPropertySetRegistry.is(),
                "ContentProviderImplHelper::getAdditionalPropertySet - "
                "Error opening registry!" );
    }

    return m_pImpl->m_xPropertySetRegistry;
}

uno::Reference< css::ucb::XPersistentPropertySet >
ContentProviderImplHelper::getAdditionalPropertySet(
    const OUString& rKey, bool bCreate )
{
    // Get propertyset registry.
    getAdditionalPropertySetRegistry();

    if ( m_pImpl->m_xPropertySetRegistry.is() )
    {
        // Open/create persistent property set.
        return m_pImpl->m_xPropertySetRegistry->openPropertySet(
                rKey, bCreate );
    }

    return uno::Reference< css::ucb::XPersistentPropertySet >();
}

bool ContentProviderImplHelper::renameAdditionalPropertySet(
    const OUString& rOldKey,
    const OUString& rNewKey,
    bool bRecursive )
{
    if ( rOldKey == rNewKey )
        return true;

    osl::MutexGuard aGuard( m_aMutex );

    if ( bRecursive )
    {
        // Get propertyset registry.
        getAdditionalPropertySetRegistry();

        if ( !m_pImpl->m_xPropertySetRegistry.is() )
            return false;

        uno::Reference< container::XNameAccess > xNameAccess(
            m_pImpl->m_xPropertySetRegistry, uno::UNO_QUERY );
        if ( !xNameAccess.is() )
            return false;

        const cpo::uno::Sequence< OUString > aKeys
            = xNameAccess->getElementNames();
        if ( aKeys.hasElements() )
        {
            OUString aOldKeyWithSlash = rOldKey;
            OUString aOldKeyWithoutSlash;
            if ( !aOldKeyWithSlash.endsWith("/") )
            {
                aOldKeyWithSlash += "/";
                aOldKeyWithoutSlash = rOldKey;
            }
            else if ( !rOldKey.isEmpty() )
                aOldKeyWithoutSlash
                    = rOldKey.copy( 0, rOldKey.getLength() - 1 );

            for ( const OUString& rKey : aKeys )
            {
                if ( rKey.startsWith( aOldKeyWithSlash )
                     || rKey == aOldKeyWithoutSlash )
                {
                    OUString aNewKey
                        = rKey.replaceAt(
                            0, rOldKey.getLength(), rNewKey );
                    if ( !renameAdditionalPropertySet(
                            rKey, aNewKey, false ) )
                        return false;
                }
            }
        }
    }
    else
    {
        // Get old property set, if exists.
        uno::Reference< css::ucb::XPersistentPropertySet > xOldSet
            = getAdditionalPropertySet( rOldKey, false );
        if ( xOldSet.is() )
        {
            // Rename property set.
            uno::Reference< container::XNamed > xNamed(
                xOldSet, uno::UNO_QUERY );
            if ( !xNamed.is() )
                return false;

            // ??? throws no exceptions and has no return value ???
            xNamed->setName( rNewKey );
        }
    }
    return true;
}

bool ContentProviderImplHelper::copyAdditionalPropertySet(
    const OUString& rSourceKey,
    const OUString& rTargetKey,
    bool bRecursive )
{
    if ( rSourceKey == rTargetKey )
        return true;

    osl::MutexGuard aGuard( m_aMutex );

    if ( bRecursive )
    {
        // Get propertyset registry.
        getAdditionalPropertySetRegistry();

        if ( !m_pImpl->m_xPropertySetRegistry.is() )
            return false;

        uno::Reference< container::XNameAccess > xNameAccess(
            m_pImpl->m_xPropertySetRegistry, uno::UNO_QUERY );
        if ( !xNameAccess.is() )
            return false;

        const cpo::uno::Sequence< OUString > aKeys
            = xNameAccess->getElementNames();
        if ( aKeys.hasElements() )
        {
            OUString aSrcKeyWithSlash = rSourceKey;
            OUString aSrcKeyWithoutSlash;
            if ( !aSrcKeyWithSlash.endsWith("/") )
            {
                aSrcKeyWithSlash += "/";
                aSrcKeyWithoutSlash = rSourceKey;
            }
            else if ( !rSourceKey.isEmpty() )
                aSrcKeyWithoutSlash = rSourceKey.copy(
                    0, rSourceKey.getLength() - 1 );

            for ( const OUString& rKey : aKeys )
            {
                if ( rKey.startsWith(aSrcKeyWithSlash )
                     || rKey == aSrcKeyWithoutSlash )
                {
                    OUString aNewKey
                        = rKey.replaceAt(
                            0, rSourceKey.getLength(), rTargetKey );
                    if ( !copyAdditionalPropertySet(
                            rKey, aNewKey, false ) )
                        return false;
                }
            }
        }
    }
    else
    {
        // Get old property set, if exists.
        uno::Reference< css::ucb::XPersistentPropertySet >
            xOldPropSet = getAdditionalPropertySet( rSourceKey, false );
        if ( !xOldPropSet.is() )
            return false;

        uno::Reference< beans::XPropertySetInfo > xPropSetInfo
            = xOldPropSet->getPropertySetInfo();
        if ( !xPropSetInfo.is() )
            return false;

        uno::Reference< beans::XPropertyAccess > xOldPropAccess(
            xOldPropSet, uno::UNO_QUERY );
        if ( !xOldPropAccess.is() )
            return false;

        // Obtain all values from old set.
        const cpo::uno::Sequence< beans::PropertyValue > aValues
            = xOldPropAccess->getPropertyValues();

        const cpo::uno::Sequence< beans::Property > aProps
            = xPropSetInfo->getProperties();

        if ( aValues.hasElements() )
        {
            // Fail, if property set with new key already exists.
            uno::Reference< css::ucb::XPersistentPropertySet >
                xNewPropSet
                    = getAdditionalPropertySet( rTargetKey, false );
            if ( xNewPropSet.is() )
                return false;

            // Create new, empty set.
            xNewPropSet = getAdditionalPropertySet( rTargetKey, true );
            if ( !xNewPropSet.is() )
                return false;

            uno::Reference< beans::XPropertyContainer > xNewPropContainer(
                xNewPropSet, uno::UNO_QUERY );
            if ( !xNewPropContainer.is() )
                return false;

            for ( const beans::PropertyValue& rValue : aValues )
            {
                sal_Int16 nAttribs = 0;
                auto pProp = std::find_if(aProps.begin(), aProps.end(),
                    [&rValue](const beans::Property& rProp) { return rProp.Name == rValue.Name; });
                if (pProp != aProps.end())
                    nAttribs = pProp->Attributes;

                try
                {
                    xNewPropContainer->addProperty(
                        rValue.Name, nAttribs, rValue.Value );
                }
                catch ( beans::PropertyExistException & )
                {
                }
                   catch ( beans::IllegalTypeException & )
                {
                }
                catch ( lang::IllegalArgumentException & )
                {
                }
            }
        }
    }
    return true;
}

bool ContentProviderImplHelper::removeAdditionalPropertySet(
    const OUString& rKey, bool bRecursive )
{
    osl::MutexGuard aGuard( m_aMutex );

    if ( bRecursive )
    {
        // Get propertyset registry.
        getAdditionalPropertySetRegistry();

        if ( !m_pImpl->m_xPropertySetRegistry.is() )
            return false;

        uno::Reference< container::XNameAccess > xNameAccess(
            m_pImpl->m_xPropertySetRegistry, uno::UNO_QUERY );
        if ( !xNameAccess.is() )
            return false;

        const cpo::uno::Sequence< OUString > aKeys
            = xNameAccess->getElementNames();
        if ( aKeys.hasElements() )
        {
            OUString aKeyWithSlash = rKey;
            OUString aKeyWithoutSlash;
            if ( !aKeyWithSlash.endsWith("/") )
            {
                aKeyWithSlash += "/";
                aKeyWithoutSlash = rKey;
            }
            else if ( !rKey.isEmpty() )
                aKeyWithoutSlash
                    = rKey.copy( 0, rKey.getLength() - 1 );

            for ( const OUString& rCurrKey : aKeys )
            {
                if ( rCurrKey.startsWith(aKeyWithSlash )
                     || rCurrKey == aKeyWithoutSlash )
                {
                    if ( !removeAdditionalPropertySet(
                             rCurrKey, false ) )
                        return false;
                }
            }
        }
    }
    else
    {
        // Get propertyset registry.
        getAdditionalPropertySetRegistry();

        if ( !m_pImpl->m_xPropertySetRegistry.is() )
            return false;

        m_pImpl->m_xPropertySetRegistry->removePropertySet( rKey );
    }
    return true;
}

} // namespace ucbhelper

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