/* -*- 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 <comphelper/anytohash.hxx>

#include <o3tl/hash_combine.hxx>

#include <typelib/typedescription.hxx>

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

#include "typedescriptionref.hxx"

using namespace ::com::sun::star;

using ::com::sun::star::uno::TypeDescription;

using ::comphelper::detail::TypeDescriptionRef;

namespace comphelper {

namespace {

std::optional<size_t> hashValue( size_t hash,

                  void const * val, typelib_TypeDescriptionReference * typeRef )

{

    o3tl::hash_combine( hash, typeRef->eTypeClass );

    if (typeRef->eTypeClass == typelib_TypeClass_VOID) {

        return hash;

    }

    assert(val != nullptr);

    switch (typeRef->eTypeClass) {

    case typelib_TypeClass_INTERFACE: {

        return std::nullopt; // not implemented

    }

    case typelib_TypeClass_STRUCT:

    case typelib_TypeClass_EXCEPTION: {

        TypeDescription typeDescr( typeRef );

        if (!typeDescr.is())

            typeDescr.makeComplete();

        if (!typeDescr.is())

            return std::nullopt;

        typelib_CompoundTypeDescription * compType =

            reinterpret_cast< typelib_CompoundTypeDescription * >(

                typeDescr.get() );

        sal_Int32 nDescr = compType->nMembers;

        if (compType->pBaseTypeDescription) {

            std::optional<size_t> tmpHash = hashValue(

                hash, val, reinterpret_cast<

                typelib_TypeDescription * >(

                    compType->pBaseTypeDescription)->pWeakRef);

            if(!tmpHash.has_value())

                return std::nullopt;

            hash = *tmpHash;

        }

        typelib_TypeDescriptionReference ** ppTypeRefs =

            compType->ppTypeRefs;

        sal_Int32 * memberOffsets = compType->pMemberOffsets;

        for ( sal_Int32 nPos = 0; nPos < nDescr; ++nPos )

        {

            TypeDescriptionRef memberType( ppTypeRefs[ nPos ] );

            if (!memberType.is())

                return std::nullopt;

            std::optional<size_t> tmpHash = hashValue( hash,

                             static_cast< char const * >(

                                 val ) + memberOffsets[ nPos ],

                             memberType->pWeakRef );

            if(!tmpHash.has_value())

                return std::nullopt;

            hash = *tmpHash;

        }

        break;

    }

    case typelib_TypeClass_SEQUENCE: {

        TypeDescriptionRef typeDescr( typeRef );

        if (!typeDescr.is())

            return std::nullopt;

        typelib_TypeDescriptionReference * elementTypeRef =

            reinterpret_cast<

            typelib_IndirectTypeDescription * >(typeDescr.get())->pType;

        TypeDescriptionRef elementTypeDescr( elementTypeRef );

        if (!elementTypeDescr.is())

            return std::nullopt;

        sal_Int32 nElementSize = elementTypeDescr->nSize;

        uno_Sequence * seq =

            *static_cast< uno_Sequence * const * >(val);

        sal_Int32 nElements = seq->nElements;

        if (nElements > 0)

        {

            char const * pElements = seq->elements;

            for ( sal_Int32 nPos = 0; nPos < nElements; ++nPos )

            {

                std::optional<size_t> tmpHash = hashValue( hash,

                    pElements + (nElementSize * nPos),

                    elementTypeDescr->pWeakRef );

                if(!tmpHash.has_value())

                    return std::nullopt;

                hash = *tmpHash;

            }

        }

        break;

    }

    case typelib_TypeClass_ANY: {

        uno_Any const * pAny = static_cast< uno_Any const * >(val);

        return hashValue( hash, pAny->pData, pAny->pType );

    }

    case typelib_TypeClass_TYPE: {

        OUString const & str = OUString::unacquired(

            &(*static_cast<

                     typelib_TypeDescriptionReference * const * >(val)

                        )->pTypeName );

        o3tl::hash_combine( hash, str.hashCode() );

        break;

    }

    case typelib_TypeClass_STRING: {

        OUString const & str = OUString::unacquired(

            static_cast< rtl_uString * const * >(val) );

        o3tl::hash_combine( hash, str.hashCode() );

        break;

    }

    case typelib_TypeClass_ENUM: {

        TypeDescription typeDescr( typeRef );

        if (!typeDescr.is())

            typeDescr.makeComplete();

        if (!typeDescr.is())

            return std::nullopt;

        o3tl::hash_combine( hash, *static_cast< int const * >(val));

        break;

    }

    case typelib_TypeClass_BOOLEAN:

        if (*static_cast< sal_Bool const * >(val))

            o3tl::hash_combine( hash, true );

        else

            o3tl::hash_combine( hash, false );

        break;

    case typelib_TypeClass_CHAR: {

        o3tl::hash_combine( hash, *static_cast< sal_Unicode const * >(val));

        break;

    }

    case typelib_TypeClass_FLOAT:

        o3tl::hash_combine( hash, *static_cast< float const * >(val) );

        break;

    case typelib_TypeClass_DOUBLE:

        o3tl::hash_combine( hash, *static_cast< double const * >(val) );

        break;

    case typelib_TypeClass_BYTE:

        o3tl::hash_combine( hash, *static_cast< sal_Int8 const * >(val) );

        break;

    case typelib_TypeClass_SHORT:

        o3tl::hash_combine( hash, *static_cast< sal_Int16 const * >(val) );

        break;

    case typelib_TypeClass_UNSIGNED_SHORT:

        o3tl::hash_combine( hash, *static_cast< sal_uInt16 const * >(val) );

        break;

    case typelib_TypeClass_LONG:

        o3tl::hash_combine( hash, *static_cast< sal_Int32 const * >(val) );

        break;

    case typelib_TypeClass_UNSIGNED_LONG:

        o3tl::hash_combine( hash, *static_cast< sal_uInt32 const * >(val) );

        break;

    case typelib_TypeClass_HYPER:

        o3tl::hash_combine( hash, *static_cast< sal_Int64 const * >(val) );

        break;

    case typelib_TypeClass_UNSIGNED_HYPER:

        o3tl::hash_combine( hash, *static_cast< sal_uInt64 const * >(val) );

        break;

//     case typelib_TypeClass_UNKNOWN:

//     case typelib_TypeClass_SERVICE:

//     case typelib_TypeClass_MODULE:

    default:

        return std::nullopt;

    }

    return hash;

}

} // anon namespace

std::optional<size_t> anyToHash( uno::Any const & value )

{

    size_t hash = 0;

    return hashValue( hash, value.getValue(), value.getValueTypeRef());

}

} // namespace comphelper

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