/* -*- 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 <rtl/locale.h>

#include <osl/diagnose.h>
#include <rtl/alloc.h>

#include <rtllifecycle.h>

static const sal_Int32 RTL_HASHTABLE_SIZE[] =
{
    7, 31, 127, 251, 509, 1021, 2039, 4093
};

struct RTL_HASHENTRY
{
    rtl_Locale* Entry;
    RTL_HASHENTRY* Next;
};

struct RTL_HASHTABLE
{
    sal_Int8        iSize;
    sal_Int32       Size;
    sal_Int32       Elements;
    RTL_HASHENTRY** Table;
};

static RTL_HASHTABLE* g_pLocaleTable = nullptr;

static rtl_Locale* g_pDefaultLocale = nullptr;

extern "C" void rtl_hashentry_destroy(RTL_HASHENTRY* entry)
{
    rtl_uString_release(entry->Entry->Language);
    rtl_uString_release(entry->Entry->Country);
    rtl_uString_release(entry->Entry->Variant);

    if (entry->Next)
        rtl_hashentry_destroy(entry->Next);

    rtl_freeMemory(entry->Entry);
    rtl_freeMemory(entry);
}

extern "C" void rtl_hashtable_destroy(RTL_HASHTABLE* table)
{
    sal_Int32 size = 0;

    if (!table)
        return;

    size = table->Size;

    while (size)
    {
        if (table->Table[size - 1])
            rtl_hashentry_destroy(table->Table[size - 1]);

        size--;
    }

    rtl_freeMemory(table->Table);
    rtl_freeMemory(table);
}

extern "C" void rtl_hashtable_init(RTL_HASHTABLE** table, sal_Int8 sizeIndex)
{
    sal_Int32 nSize = RTL_HASHTABLE_SIZE[sizeIndex];

    if (*table)
        rtl_hashtable_destroy(*table);

    *table = static_cast< RTL_HASHTABLE* >(rtl_allocateMemory(sizeof(RTL_HASHTABLE)));

    (*table)->iSize = sizeIndex;
    (*table)->Size = nSize;
    (*table)->Elements = 0;
    (*table)->Table = static_cast< RTL_HASHENTRY** >(rtl_allocateMemory((*table)->Size * sizeof(RTL_HASHENTRY*)));

    while (nSize)
    {
        (*table)->Table[nSize - 1] = nullptr;
        nSize--;
    }
}

extern "C" sal_Int32 rtl_hashfunc(RTL_HASHTABLE* table, sal_Int32 key)
{
    return (static_cast<sal_uInt32>(key) % table->Size);
}

extern "C" sal_Bool rtl_hashtable_grow(RTL_HASHTABLE** table);

extern "C" rtl_Locale* rtl_hashtable_add(RTL_HASHTABLE** table, rtl_Locale* value)
{
    sal_Int32 key = 0;

    if (!(*table))
        return nullptr;

    if ((*table)->Elements > ((*table)->Size / 2))
        rtl_hashtable_grow(table);

    key = rtl_hashfunc(*table, value->HashCode);

    RTL_HASHENTRY **pEntry = &(*table)->Table[key];
    while (*pEntry)
    {
        if (value->HashCode == (*pEntry)->Entry->HashCode)
            return (*pEntry)->Entry;

        pEntry = &(*pEntry)->Next;
    }

    RTL_HASHENTRY *newEntry = static_cast< RTL_HASHENTRY* >(rtl_allocateMemory(sizeof(RTL_HASHENTRY)));
    newEntry->Entry = value;
    newEntry->Next = nullptr;
    *pEntry = newEntry;
    (*table)->Elements++;
    return nullptr;
}

sal_Bool rtl_hashtable_grow(RTL_HASHTABLE** table)
{
    RTL_HASHTABLE* pNewTable = nullptr;
    sal_Int32 i = 0;

    rtl_hashtable_init(&pNewTable, static_cast<sal_Int8>((*table)->iSize + 1));

    while (i < (*table)->Size)
    {
        if ((*table)->Table[i])
        {
            RTL_HASHENTRY *pNext;
            RTL_HASHENTRY *pEntry = (*table)->Table[i];

            rtl_hashtable_add(&pNewTable, pEntry->Entry);

            while (pEntry->Next)
            {
                rtl_hashtable_add(&pNewTable, pEntry->Next->Entry);
                pNext = pEntry->Next;
                rtl_freeMemory(pEntry);
                pEntry = pNext;
            }

            rtl_freeMemory(pEntry);
        }

        i++;
    }

    rtl_freeMemory((*table)->Table);
    rtl_freeMemory(*table);
    (*table) = pNewTable;

    return true;
}

extern "C" sal_Bool rtl_hashtable_find(RTL_HASHTABLE * table, sal_Int32 key, sal_Int32 hashCode, rtl_Locale** pValue)
{
    if (!table)
        return false;

    if (table->Table[key])
    {
        RTL_HASHENTRY *pEntry = table->Table[key];

        while (pEntry && hashCode != pEntry->Entry->HashCode)
        {
            pEntry = pEntry->Next;
        }

        if (pEntry)
            *pValue = pEntry->Entry;
        else
            return false;
    }
    else
    {
        return false;
    }

    return true;
}

void rtl_locale_init()
{
    OSL_ASSERT(!g_pLocaleTable);
    rtl_hashtable_init(&g_pLocaleTable, 1);
}

void rtl_locale_fini()
{
    if (g_pLocaleTable)
    {
        rtl_hashtable_destroy (g_pLocaleTable);
        g_pLocaleTable = nullptr;
    }
}

rtl_Locale * SAL_CALL rtl_locale_register(const sal_Unicode * language, const sal_Unicode * country, const sal_Unicode * variant)
{
    sal_Unicode c = 0;
    rtl_uString* sLanguage = nullptr;
    rtl_uString* sCountry = nullptr;
    rtl_uString* sVariant = nullptr;
    rtl_Locale *newLocale = nullptr;
    sal_Int32 hashCode = -1;
    sal_Int32 key = 0;

    if (!country)
        country = &c;

    if (!variant)
        variant = &c;

    ensureLocaleSingleton();
    if (!g_pLocaleTable)
        return nullptr;

    hashCode = rtl_ustr_hashCode(language) ^ rtl_ustr_hashCode(country) ^ rtl_ustr_hashCode(variant);
    key = rtl_hashfunc(g_pLocaleTable, hashCode);

    if (rtl_hashtable_find(g_pLocaleTable, key, hashCode, &newLocale))
        return newLocale;

    rtl_uString_newFromStr(&sLanguage, language);
    rtl_uString_newFromStr(&sCountry, country);
    rtl_uString_newFromStr(&sVariant, variant);

    newLocale = static_cast<rtl_Locale*>(rtl_allocateMemory( sizeof(rtl_Locale) ));

    newLocale->Language = sLanguage;
    newLocale->Country = sCountry;
    newLocale->Variant = sVariant;
    newLocale->HashCode = hashCode;

    rtl_hashtable_add(&g_pLocaleTable, newLocale);

    return newLocale;
}

rtl_Locale * SAL_CALL rtl_locale_getDefault()
{
    return g_pDefaultLocale;
}

void SAL_CALL rtl_locale_setDefault(const sal_Unicode * language, const sal_Unicode * country, const sal_Unicode * variant)
{
    g_pDefaultLocale = rtl_locale_register(language, country, variant);
}

rtl_uString * SAL_CALL rtl_locale_getLanguage(rtl_Locale * This)
{
    rtl_uString_acquire(This->Language);
    return This->Language;
}

rtl_uString * SAL_CALL rtl_locale_getCountry(rtl_Locale * This)
{
    rtl_uString_acquire(This->Country);
    return This->Country;
}

rtl_uString * SAL_CALL rtl_locale_getVariant(rtl_Locale * This)
{
    rtl_uString_acquire(This->Variant);
    return This->Variant;
}

sal_Int32 SAL_CALL rtl_locale_hashCode(rtl_Locale * This)
{
    return This->HashCode;
}

sal_Int32 SAL_CALL rtl_locale_equals(rtl_Locale * This, rtl_Locale * obj)
{
    return This == obj;
}

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