/* -*- 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 .
 */

#ifdef _WIN32
#include <prewin.h>
#include <postwin.h>
#else
// From MinGW
typedef unsigned short WORD;
#define PRIMARYLANGID(lgid) (static_cast<WORD>(lgid) & 0x3ff)
#define SUBLANGID(lgid) (static_cast<WORD>(lgid) >> 10)
#define LANG_SPANISH 0x0a
#define SUBLANG_NEUTRAL 0x00
#define SUBLANG_SPANISH 0x01
#endif

#include "cmdline.hxx"

#include <comphelper/string.hxx>
#include <osl/thread.h>
#include <osl/process.h>
#include <osl/file.hxx>
#include <sal/main.h>

#include <tools/config.hxx>
#include <i18nlangtag/languagetag.hxx>

#include <iostream>
#include <fstream>
#include <map>
#include <iterator>
#include <string>
#include <string_view>

#ifndef _WIN32
#include <cstring>
#endif

namespace /* private */
{


void ShowUsage()
{
    std::cout << "Usage: -ulf ulf_file -rc rc_output_file -rct rc_template_file -rch rch_file -rcf rcf_file" << std::endl;
    std::cout << "-ulf Name of the ulf file" << std::endl;
    std::cout << "-rc  Name of the resulting resource file" << std::endl;
    std::cout << "-rct Name of the resource template file" << std::endl;
    std::cout << "-rch Name of the resource file header" << std::endl;
    std::cout << "-rcf Name of the resource file footer" << std::endl;
}

OUString OStringToOUString(std::string_view str)
{ return rtl::OStringToOUString(str, osl_getThreadTextEncoding()); }

OString OUStringToOString(std::u16string_view str)
{ return rtl::OUStringToOString(str, osl_getThreadTextEncoding()); }

/** Get the directory where the module
    is located as system directory, the
    returned directory has a trailing '\'  */
OUString get_module_path()
{
    OUString cwd_url;
    OUString module_path;
    if (osl_Process_E_None == osl_getProcessWorkingDir(&cwd_url.pData))
        osl::FileBase::getSystemPathFromFileURL(cwd_url, module_path);

    return module_path;
}

/** Make the absolute directory of a base and
    a relative directory, if the relative
    directory is absolute the relative
    directory will be returned unchanged.
    Base and relative directory should be
    system paths the returned directory is
    a system path too */
OUString get_absolute_path(
    const OUString& BaseDir, const OUString& RelDir)
{
    OUString base_url;
    OUString rel_url;

    osl::FileBase::getFileURLFromSystemPath(BaseDir, base_url);
    osl::FileBase::getFileURLFromSystemPath(RelDir, rel_url);

    OUString abs_url;
    (void)osl::FileBase::getAbsoluteFileURL(base_url, rel_url, abs_url);

    OUString abs_sys_path;
    osl::FileBase::getSystemPathFromFileURL(abs_url, abs_sys_path);

    return abs_sys_path;
}

std::string make_absolute(const std::string& file_name)
{
    OUString fp = get_absolute_path(
        get_module_path(), OStringToOUString(file_name.c_str()));
    return std::string(OUStringToOString(fp));
}

/** A helper class, enables stream exceptions
    on construction, restores the old exception
    state on destruction */
class StreamExceptionsEnabler
{
public:
    explicit StreamExceptionsEnabler(
        std::ios& iostrm ) :
        m_IoStrm(iostrm),
        m_OldIos(m_IoStrm.exceptions())
    {
        m_IoStrm.exceptions(std::ios::failbit | std::ios::badbit);
    }

    ~StreamExceptionsEnabler()
    {
        m_IoStrm.exceptions(m_OldIos);
    }
private:
    std::ios& m_IoStrm;
    std::ios::iostate m_OldIos;
};

class iso_lang_identifier
{
public:
    iso_lang_identifier() {};

    explicit iso_lang_identifier(const OString& str) :
        maBcp47(str)
    { }

    explicit iso_lang_identifier(const std::string& str) :
        maBcp47(str.c_str())
    { }

    OUString make_OUString() const
    { return OStringToOUString( maBcp47, RTL_TEXTENCODING_ASCII_US); }

    std::string make_std_string() const
    { return maBcp47.getStr(); }

private:
    OString maBcp47;
};

/** Convert an OUString to the MS resource
    file format string e.g.
    OUString -> L"\x1A00\x2200\x3400" */
std::string make_winrc_unicode_string(const OUString& str)
{
    std::ostringstream oss;
    oss << "L\"";

    size_t length = str.getLength();
    const sal_Unicode* pchr = str.getStr();

    for (size_t i = 0; i < length; i++)
        oss << "\\x" << std::hex << static_cast<int>(*pchr++);

    oss << "\"";
    return oss.str();
}

std::string make_winrc_unicode_string(const std::string& str)
{
    return make_winrc_unicode_string(
        OUString::createFromAscii(str.c_str()));
}

/** A replacement table contains pairs of
    placeholders and the appropriate substitute */
class Substitutor
{
private:
    typedef std::map<std::string, std::string> replacement_table_t;
    typedef std::map<std::string, replacement_table_t> iso_lang_replacement_table_t;

public:
    typedef iso_lang_replacement_table_t::iterator iterator;
    typedef iso_lang_replacement_table_t::const_iterator const_iterator;

    iterator begin()
    { return iso_lang_replacement_table_.begin(); }

    iterator end()
    { return iso_lang_replacement_table_.end(); }

public:

    Substitutor() {};

    void set_language(const iso_lang_identifier& iso_lang)
    {
        active_iso_lang_ = iso_lang;
    }

    // If Text is a placeholder substitute it with
    //its substitute else leave it unchanged
    void substitute(std::string& Text)
    {
        replacement_table_t& prt = get_replacement_table(active_iso_lang_.make_std_string());
        replacement_table_t::iterator iter = prt.find(Text);
        if (iter != prt.end())
            Text = iter->second;
    }

    void add_substitution(
        const std::string& Placeholder, const std::string& Substitute)
    {
        replacement_table_t& prt = get_replacement_table(active_iso_lang_.make_std_string());
        prt.insert(std::make_pair(Placeholder, Substitute));
    }


private:
    // Return the replacement table for the iso lang id
    // create a new one if not already present
    replacement_table_t& get_replacement_table(const std::string& iso_lang)
    {
        return iso_lang_replacement_table_[iso_lang];
    }

private:
    iso_lang_replacement_table_t iso_lang_replacement_table_;
    iso_lang_identifier active_iso_lang_;
};

void add_group_entries(
    Config& aConfig,
    const OString& GroupName,
    Substitutor& Substitutor)
{
    OSL_ASSERT(aConfig.HasGroup(GroupName));

    aConfig.SetGroup(GroupName);
    size_t key_count = aConfig.GetKeyCount();
    std::map< LanguageType, std::string > map;

    for (size_t i = 0; i < key_count; i++)
    {
        OString iso_lang = aConfig.GetKeyName(sal::static_int_cast<sal_uInt16>(i));
        OString key_value_utf8 = aConfig.ReadKey(sal::static_int_cast<sal_uInt16>(i));
        iso_lang_identifier myiso_lang( iso_lang );
        LanguageType ltype = LanguageTag( myiso_lang.make_OUString()).makeFallback().getLanguageType();
        if(  ( static_cast<sal_uInt16>(ltype) & 0x0200 ) == 0 && map[ ltype ].empty()  )
        {
            Substitutor.set_language(iso_lang_identifier(iso_lang));

            key_value_utf8 = comphelper::string::strip(key_value_utf8, '\"');

            OUString key_value_utf16 =
                OStringToOUString(key_value_utf8, RTL_TEXTENCODING_UTF8);

            Substitutor.add_substitution(
                GroupName.getStr(), make_winrc_unicode_string(key_value_utf16));
            map[ ltype ] = std::string( iso_lang.getStr() );
        }
        else
        {
            if( !map[ ltype ].empty() )
            {
                printf("ERROR: Duplicated ms id %d found for the languages %s and %s !!!! This does not work in microsoft resources\nPlease remove one!\n", static_cast<sal_uInt16>(ltype) , map[ ltype ].c_str() , iso_lang.getStr());
                exit( -1 );
            }
        }
    }
}

void read_ulf_file(const std::string& FileName, Substitutor& Substitutor)
{
    // work-around for #i32420#

    // as the Config class is currently not able to deal correctly with
    // UTF8 files starting with a byte-order-mark we create a copy of the
    // original file without the byte-order-mark
    OUString tmpfile_url;
    osl_createTempFile(nullptr, nullptr, &tmpfile_url.pData);

    OUString tmpfile_sys;
    osl::FileBase::getSystemPathFromFileURL(tmpfile_url, tmpfile_sys);

    std::ifstream in(FileName.c_str());
    std::ofstream out(OUStringToOString(tmpfile_sys).getStr());

    try
    {
        StreamExceptionsEnabler sexc_out(out);
        StreamExceptionsEnabler sexc_in(in);

        //skip the byte-order-mark 0xEF 0xBB 0xBF, identifying UTF8 files
        unsigned char const BOM[3] = {0xEF, 0xBB, 0xBF};
        char buff[3];
        in.read(&buff[0], 3);

        if (memcmp(buff, BOM, 3) != 0)
            in.seekg(0);

        std::string line;
        while (std::getline(in, line))
            out << line << std::endl;
    }
    catch (const std::ios::failure&)
    {
        if (!in.eof())
            throw;
    }


    // end work-around for #i32420#

    Config config(tmpfile_url);
    size_t grpcnt = config.GetGroupCount();
    for (size_t i = 0; i < grpcnt; i++)
        add_group_entries(config, config.GetGroupName(sal::static_int_cast<sal_uInt16>(i)), Substitutor);
}

void read_file(
    const std::string& fname,
    std::vector<std::string>& string_container)
{
    std::ifstream file(fname.c_str());
    StreamExceptionsEnabler sexc(file);

    try
    {
        std::string line;
        while (std::getline(file, line))
            string_container.push_back(line);
    }
    catch(const std::ios::failure&)
    {
        if (!file.eof())
            throw;
    }
}

/** A simple helper function that happens the
    content of one file to another one  */
void concatenate_files(std::ostream& os, std::istream& is)
{
    StreamExceptionsEnabler os_sexc(os);
    StreamExceptionsEnabler is_sexc(is);

    try
    {
        std::string line;
        while (std::getline(is, line))
            os << line << std::endl;
    }
    catch(const std::ios::failure&)
    {
        if (!is.eof())
            throw;
    }
}

bool is_placeholder(const std::string& str)
{
    return ((str.length() > 1) &&
            ('%' == str[0]) &&
            ('%' == str[str.length() - 1]));
}

void start_language_section(
    std::ostream_iterator<std::string>& ostream_iter, const iso_lang_identifier& iso_lang)
{
    ostream_iter = std::string();

    std::string lang_section("LANGUAGE ");

    LanguageType ltype = LanguageTag( iso_lang.make_OUString()).makeFallback().getLanguageType();

    char buff[10];
    int primLangID = PRIMARYLANGID(ltype);
    int subLangID = SUBLANGID(ltype);
    // Our resources are normally not sub language dependent.
    // Esp. for spanish we don't want to distinguish between trad.
    // and international sorting (which leads to two different sub languages)
    // Setting the sub language to neutral allows us to use one
    // stringlist for all spanish variants
    if ( ( primLangID == LANG_SPANISH ) &&
         ( subLangID == SUBLANG_SPANISH ) )
        subLangID = SUBLANG_NEUTRAL;

#ifdef _WIN32
    _itoa(primLangID, buff, 16);
#else
    sprintf(buff, "%x", primLangID);
#endif
    lang_section += std::string("0x") + std::string(buff);

    lang_section += std::string(" , ");

#ifdef _WIN32
    _itoa(subLangID, buff, 16);
#else
    sprintf(buff, "%x", subLangID);
#endif
    lang_section += std::string("0x") + std::string(buff);
    ostream_iter = lang_section;
}

/** Iterate all languages in the substitutor,
    replace the all placeholder and append the
    result to the output file */
void inflate_rc_template_to_file(
    std::ostream& os, const std::vector<std::string>& rctmpl, Substitutor& substitutor)
{
    StreamExceptionsEnabler sexc(os);

    Substitutor::const_iterator iter = substitutor.begin();
    Substitutor::const_iterator iter_end = substitutor.end();

    std::ostream_iterator<std::string> oi(os, "\n");

    for ( /**/ ;iter != iter_end; ++iter)
    {
        substitutor.set_language(iso_lang_identifier(iter->first));

        if (!rctmpl.empty())
            start_language_section(oi, iso_lang_identifier(iter->first));

        for ( auto& rct : rctmpl)
        {
            std::istringstream iss(rct);
            std::string line;

            while (iss)
            {
                std::string token;
                iss >> token;
                substitutor.substitute(token);

                // HACK for partially merged
                // *.lng files where some strings have
                // a particular language that others
                // don't have in order to keep the
                // build
                // coverity[tainted_data] - trusted data source
                if (is_placeholder(token))
                    token = make_winrc_unicode_string(token);

                line += token;
                line += " ";
            }
            oi = line;
        }
    }
}

} // namespace /* private */

/* MAIN
   The file names provided via command line should be
   absolute or relative to the directory of this module.

   Algo:
   1. read the ulf file and initialize the substitutor
   2. read the resource template file
   3. create the output file and append the header
   4. inflate the resource template to the output file
      for every language using the substitutor
   5. append the footer
*/

SAL_IMPLEMENT_MAIN_WITH_ARGS(argc, argv)
{
    try
    {
        CommandLine cmdline(argc, argv);

        Substitutor substitutor;
        read_ulf_file(make_absolute(cmdline.get_arg("-ulf")), substitutor);

        std::vector<std::string> rc_tmpl;
        read_file(make_absolute(cmdline.get_arg("-rct")), rc_tmpl);

        std::ofstream rc_file(make_absolute(cmdline.get_arg("-rc")));
        std::ifstream in_header(make_absolute(cmdline.get_arg("-rch")));
        concatenate_files(rc_file, in_header);

        inflate_rc_template_to_file(rc_file, rc_tmpl, substitutor);

        std::ifstream in_footer(make_absolute(cmdline.get_arg("-rcf")));
        concatenate_files(rc_file, in_footer);
    }
    catch(const std::ios::failure& ex)
    {
        std::cout << ex.what() << std::endl;
        return 1;
    }
    catch(const std::exception& ex)
    {
        std::cout << ex.what() << std::endl;
        ShowUsage();
        return 1;
    }
    catch(...)
    {
        std::cout << "Unexpected error..." << std::endl;
        return 1;
    }
    return 0;
}

/* vim:set shiftwidth=4 softtabstop=4 expandtab: */