/* AbiSuite
 * Copyright (C) 2001 Dom Lachowicz <cinamod@hotmail.com>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
 * 02110-1301 USA.
 */

#ifndef SPELL_MANAGER_H
#define SPELL_MANAGER_H

#include <memory>
#include <vector>

/* pre-emptive dismissal; ut_types.h is needed by just about everything,
 * so even if it's commented out in-file that's still a lot of work for
 * the preprocessor to do...
 */
#ifndef UT_TYPES_H
#include "ut_types.h"
#endif
#include "ut_string_class.h"
#include "ut_hash.h"
#include "barbarisms.h"

// forward declaration
class SpellManager;

struct DictionaryMapping
{
	std::string lang;	// the language tag
	std::string dict;	// the dictionary for the tag
	std::string enc;	// the encoding of the dictionary
};

class ABI_EXPORT SpellChecker
{
	friend class SpellManager;

public:

	enum SpellCheckResult
	{
		LOOKUP_SUCCEEDED = 0, // looking up the word succeeded
		LOOKUP_FAILED = 1,    // could not find the word
		LOOKUP_ERROR = 2      // internal error
	};

	SpellCheckResult	checkWord(const UT_UCSChar* word, size_t len);
	std::unique_ptr<std::vector<UT_UCSChar*>> suggestWord(const UT_UCSChar* word, size_t len);

	// vector of DictionaryMapping*
	virtual	const std::vector<DictionaryMapping> & getMapping() const {return m_vecEmpty;};
	virtual bool doesDictionaryExist (const char * /*szLang*/) {return false;};
	virtual bool addToCustomDict (const UT_UCSChar *word, size_t len);

	virtual void correctWord (const UT_UCSChar *toCorrect, size_t toCorrectLen,
							  const UT_UCSChar *correct, size_t correctLen);

	virtual void ignoreWord (const UT_UCSChar *toCorrect, size_t toCorrectLen) = 0;

	virtual bool isIgnored (const UT_UCSChar * pWord, size_t len) const = 0;

	const std::string& getLanguage() const
	{
		return m_sLanguage;
	}

	bool requestDictionary (const char * szLang);
	bool isDictionaryFound(void)
		{ return m_bFoundDictionary;}
	void setDictionaryFound(bool b)
		{ m_bFoundDictionary = b;}

protected:

	SpellChecker();

	virtual ~SpellChecker();

    void setLanguage (const char * lang)
    {
		m_sLanguage = lang;
    }

	static void couldNotLoadDictionary ( const char * szLang );

	std::string       	m_sLanguage;
    BarbarismChecker	m_BarbarismChecker;
	std::vector<DictionaryMapping> m_vecEmpty;

    bool				m_bIsBarbarism;
	bool				m_bIsDictionaryWord;
	bool                m_bFoundDictionary;

private:
    SpellChecker(const SpellChecker&) = delete;
    void operator=(const SpellChecker&) = delete;

	virtual bool				_requestDictionary (const char * szLang) = 0;
	virtual SpellCheckResult	_checkWord(const UT_UCSChar* word, size_t len) = 0;
	virtual std::unique_ptr<std::vector<UT_UCSChar*>> _suggestWord(const UT_UCSChar* word, size_t len) = 0;
};

class ABI_EXPORT SpellManager
{
public:
	static SpellManager & instance (void);

	virtual ~SpellManager ();


	virtual SpellChecker * lastDictionary (void) const;
	virtual SpellChecker * requestDictionary (const char * szLang);
	UT_uint32 numLoadedDicts () const { return m_nLoadedDicts; }

	SpellChecker *	getInstance() const;

private:
	SpellManager();
	SpellManager(const SpellManager & other) = delete;
	SpellManager & operator=(const SpellManager& other) = delete;


	UT_StringPtrMap m_map;
	std::string m_missingHashs;
	SpellChecker * m_lastDict;
	UT_uint32 m_nLoadedDicts;
};

#endif /* SPELL_MANAGER_H */
