/* -*- 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 .

 */

 /**

  *

  *

  *

  *

  * TODO

  * - Add exception throwing when h == NULL

  * - Not init h when implicit constructor is launched

  */

#include <string.h>

#ifdef SYSTEM_LIBEXTTEXTCAT

#include <libexttextcat/textcat.h>

#include <libexttextcat/common.h>

#include <libexttextcat/constants.h>

#include <libexttextcat/fingerprint.h>

#else

#include <textcat.h>

#include <common.h>

#include <constants.h>

#include <fingerprint.h>

#endif

#include <sal/types.h>

#include<rtl/character.hxx>

#include "simpleguesser.hxx"

static int startsAsciiCaseInsensitive(const std::string &s1, const std::string &s2){

            size_t i;

            int ret = 0;

            size_t min = s1.length();

            if (min > s2.length())

                min = s2.length();

            for(i = 0; i < min && s2[i] && s1[i] && !ret; i++){

                    ret = rtl::toAsciiUpperCase(static_cast<unsigned char>(s1[i]))

                        -  rtl::toAsciiUpperCase(static_cast<unsigned char>(s2[i]));

                    if(s1[i] == '.' || s2[i] == '.') {ret = 0;}    //. is a neutral character

            }

            return ret;

 }

namespace {

/**

 * This following structure is from textcat.c

 */

typedef struct textcat_t{

    void **fprint;

    char *fprint_disable;

    uint4 size;

    uint4 maxsize;

    char output[MAXOUTPUTSIZE];

} textcat_t;

// end of the 3 structs

}

SimpleGuesser::SimpleGuesser()

{

    h = nullptr;

}

SimpleGuesser& SimpleGuesser::operator=(const SimpleGuesser& sg){

    // Check for self-assignment!

    if (this == &sg)      // Same object?

      return *this;       // Yes, so skip assignment, and just return *this.

    if(h){textcat_Done(h);}

    h = sg.h;

    return *this;

}

SimpleGuesser::~SimpleGuesser()

{

    if(h){textcat_Done(h);}

}

/*!

    \fn SimpleGuesser::GuessLanguage(char* text)

 */

std::vector<Guess> SimpleGuesser::GuessLanguage(const char* text)

{

    std::vector<Guess> guesses;

    if (!h)

        return guesses;

    int len = strlen(text);

    if (len > MAX_STRING_LENGTH_TO_ANALYSE)

        len = MAX_STRING_LENGTH_TO_ANALYSE;

    const char *guess_list = textcat_Classify(h, text, len);

    if (strcmp(guess_list, TEXTCAT_RESULT_SHORT_STR) == 0)

        return guesses;

    int current_pointer = 0;

    while(guess_list[current_pointer] != '\0')

    {

        while (guess_list[current_pointer] != GUESS_SEPARATOR_OPEN && guess_list[current_pointer] != '\0')

            current_pointer++;

        if(guess_list[current_pointer] != '\0')

        {

            guesses.emplace_back(guess_list + current_pointer);

            current_pointer++;

        }

    }

    return guesses;

}

Guess SimpleGuesser::GuessPrimaryLanguage(const char* text)

{

    std::vector<Guess> ret = GuessLanguage(text);

    return ret.empty() ? Guess() : ret[0];

}

/**

 * Is used to know which language is available, unavailable or both

 * when mask = 0xF0, return only Available

 * when mask = 0x0F, return only Unavailable

 * when mask = 0xFF, return both Available and Unavailable

 */

std::vector<Guess> SimpleGuesser::GetManagedLanguages(const char mask)

{

    textcat_t *tables = static_cast<textcat_t*>(h);

    std::vector<Guess> lang;

    if(!h){return lang;}

    for (size_t i=0; i<tables->size; ++i)

    {

        if (tables->fprint_disable[i] & mask)

        {

            std::string langStr = "[";

            langStr += fp_Name(tables->fprint[i]);

            lang.emplace_back(langStr.c_str());

        }

    }

    return lang;

}

std::vector<Guess> SimpleGuesser::GetAvailableLanguages()

{

    return GetManagedLanguages( sal::static_int_cast< char >( 0xF0 ) );

}

std::vector<Guess> SimpleGuesser::GetUnavailableLanguages()

{

    return GetManagedLanguages( sal::static_int_cast< char >( 0x0F ));

}

std::vector<Guess> SimpleGuesser::GetAllManagedLanguages()

{

    return GetManagedLanguages( sal::static_int_cast< char >( 0xFF ));

}

void SimpleGuesser::XableLanguage(const std::string& lang, char mask)

{

    textcat_t *tables = static_cast<textcat_t*>(h);

    if(!h){return;}

    for (size_t i=0; i<tables->size; i++)

    {

        std::string language(fp_Name(tables->fprint[i]));

        if (startsAsciiCaseInsensitive(language,lang) == 0)

            tables->fprint_disable[i] = mask;

    }

}

void SimpleGuesser::EnableLanguage(const std::string& lang)

{

    XableLanguage(lang,  sal::static_int_cast< char >( 0xF0 ));

}

void SimpleGuesser::DisableLanguage(const std::string& lang)

{

    XableLanguage(lang,  sal::static_int_cast< char >( 0x0F ));

}

void SimpleGuesser::SetDBPath(const char* path, const char* prefix)

{

    if (h)

        textcat_Done(h);

    h = special_textcat_Init(path, prefix);

}

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