/* -*- 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 <stdio.h>
#include <string.h>
#include <dlfcn.h>
#include <cxxabi.h>
#include <rtl/strbuf.hxx>
#include <rtl/ustrbuf.hxx>
#include <osl/mutex.hxx>
#include <sal/log.hxx>

#include <com/sun/star/uno/genfunc.hxx>
#include "com/sun/star/uno/RuntimeException.hpp"
#include <typelib/typedescription.hxx>
#include <uno/any2.h>
#include <unordered_map>
#include "share.hxx"


using namespace ::std;
using namespace ::osl;
using namespace ::com::sun::star::uno;
using namespace ::__cxxabiv1;

extern sal_Int32 * pHack;
extern sal_Int32 nHack;

namespace CPPU_CURRENT_NAMESPACE
{
    void dummy_can_throw_anything( char const * )
    {
    }

    static OUString toUNOname( char const * p )
    {
#if OSL_DEBUG_LEVEL > 1
        char const * start = p;
#endif

        // example: N3com3sun4star4lang24IllegalArgumentExceptionE

        OUStringBuffer buf( 64 );
        assert( 'N' == *p );
        ++p; // skip N

        while ('E' != *p)
        {
            // read chars count
            long n = (*p++ - '0');
            while ('0' <= *p && '9' >= *p)
            {
                n *= 10;
                n += (*p++ - '0');
            }
            buf.appendAscii( p, n );
            p += n;
            if ('E' != *p)
                buf.append( '.' );
        }

#if OSL_DEBUG_LEVEL > 1
        OUString ret( buf.makeStringAndClear() );
        OString c_ret( OUStringToOString( ret, RTL_TEXTENCODING_ASCII_US ) );
        fprintf( stderr, "> toUNOname(): %s => %s\n", start, c_ret.getStr() );
        return ret;
#else
        return buf.makeStringAndClear();
#endif
    }

    class RTTI
    {
        typedef std::unordered_map< OUString, type_info * > t_rtti_map;

        Mutex m_mutex;
        t_rtti_map m_rttis;
        t_rtti_map m_generatedRttis;

#ifndef ANDROID
        void * m_hApp;
#endif

    public:
        RTTI();
        ~RTTI();

        type_info * getRTTI(typelib_CompoundTypeDescription *);
    };

    RTTI::RTTI()
#ifndef ANDROID
        : m_hApp( dlopen( 0, RTLD_LAZY ) )
#endif
    {
    }

    RTTI::~RTTI()
    {
#ifndef ANDROID
        dlclose( m_hApp );
#endif
    }


    type_info * RTTI::getRTTI( typelib_CompoundTypeDescription *pTypeDescr )
    {
        type_info * rtti;

        OUString const & unoName = *(OUString const *)&pTypeDescr->aBase.pTypeName;

        MutexGuard guard( m_mutex );
        t_rtti_map::const_iterator iFind( m_rttis.find( unoName ) );
        if (iFind == m_rttis.end())
        {
            // RTTI symbol
            OStringBuffer buf( 64 );
            buf.append( "_ZTIN" );
            sal_Int32 index = 0;
            do
            {
                OUString token( unoName.getToken( 0, '.', index ) );
                buf.append( token.getLength() );
                OString c_token( OUStringToOString( token, RTL_TEXTENCODING_ASCII_US ) );
                buf.append( c_token );
            }
            while (index >= 0);
            buf.append( 'E' );

            OString symName( buf.makeStringAndClear() );
#ifndef ANDROID
            rtti = (type_info *)dlsym( m_hApp, symName.getStr() );
#else
            rtti = (type_info *)dlsym( RTLD_DEFAULT, symName.getStr() );
            // Unfortunately dlsym for weak symbols doesn't work in
            // Android 4.0 at least, sigh, so we will always take the
            // else branch below.
#endif

            if (rtti)
            {
                pair< t_rtti_map::iterator, bool > insertion(
                    m_rttis.insert( t_rtti_map::value_type( unoName, rtti ) ) );
                (void) insertion;
                assert(insertion.second && "### inserting new rtti failed?!");
            }
            else
            {
                // try to lookup the symbol in the generated rtti map
                t_rtti_map::const_iterator iFind2( m_generatedRttis.find( unoName ) );

                if (iFind2 == m_generatedRttis.end())
                {
                    // we must generate it !
                    // symbol and rtti-name is nearly identical,
                    // the symbol is prefixed with _ZTI

#ifdef ANDROID
                    // This code is supposed to be used only used for
                    // inter-process UNO, says sberg. Thus it should
                    // be unnecessary and never reached for
                    // Android. But see above...

                    // assert(iFind2 != m_generatedRttis.end());
                    // return NULL;
#endif
                    char const * rttiName = symName.getStr() +4;
#if OSL_DEBUG_LEVEL > 1
                    fprintf( stderr,"generated rtti for %s\n", rttiName );
#endif
                    if (pTypeDescr->pBaseTypeDescription)
                    {
                        // ensure availability of base
                        type_info * base_rtti = getRTTI(
                            (typelib_CompoundTypeDescription *)pTypeDescr->pBaseTypeDescription );
                        rtti = new __si_class_type_info(
                            strdup( rttiName ), (__class_type_info *)base_rtti );
                    }
                    else
                    {
                        // this class has no base class
                        rtti = new __class_type_info( strdup( rttiName ) );
                    }

                    pair< t_rtti_map::iterator, bool > insertion(
                        m_generatedRttis.insert( t_rtti_map::value_type( unoName, rtti ) ) );
                    (void) insertion;
                    assert(insertion.second && "### inserting new generated rtti failed?!");
                }
                else // taking already generated rtti
                {
                    rtti = iFind2->second;
                }
            }
        }
        else
        {
            rtti = iFind->second;
        }

        return rtti;
    }


    static void deleteException( void * pExc )
    {
        __cxa_exception const * header = ((__cxa_exception const *)pExc - 1);
        typelib_TypeDescription * pTD = 0;
        OUString unoName( toUNOname( header->exceptionType->name() ) );
        ::typelib_typedescription_getByName( &pTD, unoName.pData );
        assert(pTD && "### unknown exception type! leaving out destruction => leaking!!!");
        if (pTD)
        {
            ::uno_destructData( pExc, pTD, cpp_release );
            ::typelib_typedescription_release( pTD );
        }
    }

    void raiseException( uno_Any * pUnoExc, uno_Mapping * pUno2Cpp )
    {
#if OSL_DEBUG_LEVEL > 1
        OString cstr(
            OUStringToOString(
                OUString::unacquired( &pUnoExc->pType->pTypeName ),
                RTL_TEXTENCODING_ASCII_US ) );
        fprintf( stderr, "> uno exception occurred: %s\n", cstr.getStr() );
#endif
        void * pCppExc;
        type_info * rtti;

        {
            // construct cpp exception object
            typelib_TypeDescription * pTypeDescr = 0;
            TYPELIB_DANGER_GET( &pTypeDescr, pUnoExc->pType );
            assert(pTypeDescr);
            if (! pTypeDescr)
            {
                throw RuntimeException(
                    OUString("cannot get typedescription for type ") +
                    OUString::unacquired( &pUnoExc->pType->pTypeName ) );
            }

            pCppExc = __cxa_allocate_exception( pTypeDescr->nSize );
            ::uno_copyAndConvertData( pCppExc, pUnoExc->pData, pTypeDescr, pUno2Cpp );

            // destruct uno exception
           ::uno_any_destruct( pUnoExc, 0 );
           // avoiding locked counts
           static RTTI * s_rtti = 0;
           if (! s_rtti)
           {
               MutexGuard guard( Mutex::getGlobalMutex() );
               if (! s_rtti)
               {
                   static RTTI rtti_data;
                   s_rtti = &rtti_data;
               }
           }
           rtti = (type_info *)s_rtti->getRTTI( (typelib_CompoundTypeDescription *) pTypeDescr );
           TYPELIB_DANGER_RELEASE( pTypeDescr );
           assert(rtti && "### no rtti for throwing exception!");
           if (! rtti)
           {
               throw RuntimeException(
                   OUString("no rtti for type ") +
                   OUString::unacquired( &pUnoExc->pType->pTypeName ) );
           }
        }

        __cxa_throw( pCppExc, rtti, deleteException );
    }

#ifdef __ARM_EABI__
    static void* getAdjustedPtr(__cxa_exception* header)
    {
        return (void*)header->unwindHeader.barrier_cache.bitpattern[0];
    }
#else
    static void* getAdjustedPtr(__cxa_exception* header)
    {
        return header->adjustedPtr;
    }
#endif

    void fillUnoException( __cxa_exception * header, uno_Any * pUnoExc, uno_Mapping * pCpp2Uno )
    {
        if (! header)
        {
            RuntimeException aRE( "no exception header!" );
            Type const & rType = cppu::UnoType<decltype(aRE)>::get();
            uno_type_any_constructAndConvert( pUnoExc, &aRE, rType.getTypeLibType(), pCpp2Uno );
            SAL_WARN("bridges", aRE.Message);
            return;
        }

        typelib_TypeDescription * pExcTypeDescr = nullptr;
        OUString unoName( toUNOname( header->exceptionType->name() ) );
#if OSL_DEBUG_LEVEL > 1
        OString cstr_unoName( OUStringToOString( unoName, RTL_TEXTENCODING_ASCII_US ) );
        fprintf( stderr, "> c++ exception occurred: %s\n", cstr_unoName.getStr() );
#endif
        typelib_typedescription_getByName( &pExcTypeDescr, unoName.pData );
        if (0 == pExcTypeDescr)
        {
            RuntimeException aRE( "exception type not found: " + unoName );
            Type const & rType = cppu::UnoType<decltype(aRE)>::get();
            uno_type_any_constructAndConvert( pUnoExc, &aRE, rType.getTypeLibType(), pCpp2Uno );
            SAL_WARN("bridges", aRE.Message);
        }
        else
        {
            // construct uno exception any
            uno_any_constructAndConvert( pUnoExc, getAdjustedPtr(header), pExcTypeDescr, pCpp2Uno );
            typelib_typedescription_release( pExcTypeDescr );
        }
    }
}

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