/* ScummVM - Graphic Adventure Engine
 *
 * ScummVM is the legal property of its developers, whose names
 * are too numerous to list here. Please refer to the COPYRIGHT
 * file distributed with this source distribution.
 *
 * 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 3 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, see <http://www.gnu.org/licenses/>.
 *
 */

#ifndef TITANIC_TT_PARSER_H
#define TITANIC_TT_PARSER_H

#include "titanic/true_talk/tt_node.h"
#include "titanic/true_talk/tt_pronoun.h"
#include "titanic/true_talk/tt_sentence.h"
#include "titanic/true_talk/tt_string.h"

namespace Titanic {

enum NumberFlag { NF_1 = 1, NF_2 = 2, NF_4 = 4, NF_8 = 8, NF_10 = 0x10 };

enum ParserAction {
	NO_ACTION = 0, CHECK_COMMAND_FORM, EXPECT_THING,  OBJECT_IS_TO,
	SEEK_ACTOR, SEEK_OBJECT, SEEK_OBJECT_OVERRIDE, SEEK_TO,
	SEEK_FROM, SEEK_TO_OVERRIDE, SEEK_FROM_OVERRIDE, SEEK_LOCATION,
	SEEK_OWNERSHIP, SEEK_STATE, SEEK_MODIFIERS, SEEK_NEW_FRAME,
	SEEK_STATE_OBJECT, SET_ACTION, SET_COLOR, ACTOR_IS_TO,
	ACTOR_IS_FROM, ACTOR_IS_OBJECT, STATE_IDENTITY,
	WORD_TYPE_IS_SENTENCE_TYPE, COMPLEX_VERB
};

class CScriptHandler;
class TTconcept;

struct NumberEntry {
	CString _text;
	int _value;
	int _flags;

	NumberEntry() : _value(0), _flags(0) {}
	NumberEntry(const CString &text, int value, int flags) :
		_text(text), _value(value), _flags(flags) {}
};
typedef Common::Array<NumberEntry> NumberArray;

class TTparserNode : public TTnode {
public:
	uint _tag;
public:
	TTparserNode() : TTnode(), _tag(0) {}
	TTparserNode(uint tag) : TTnode(), _tag(tag) {}
};

class TTparser {
private:
	StringArray _replacements1;
	StringArray _replacements2;
	StringArray _replacements3;
	StringArray _replacements4;
	StringArray _phrases;
	NumberArray _numbers;
	TTparserNode *_nodesP;
	TTconcept *_conceptP;
	TTconcept *_currentConceptP;
private:
	/**
	 * Clear the parser
	 */
	void clear();

	/**
	 * Load the data for a given array resource
	 */
	void loadArray(StringArray &arr, const CString &name);

	/**
	 * Loads the various replacement string data arrays
	 */
	void loadArrays();

	/**
	 * Normalizes a passed input, taking care of things like removing extra
	 * spaces and lowercasing everything
	 */
	int normalize(TTsentence *sentence);

	/**
	 * Submethod called by normalize to handle expanding contacted word pairs
	 * like can't, should've, and so on.
	 */
	bool normalizeContraction(const TTstring &srcLine, int &srcIndex, TTstring &destLine);

	/**
	 * Checks for what is likely special developer cheat codes
	 */
	static int isEmoticon(const TTstring &str, int &index);

	/**
	 * Checks if any word within a passed line has an entry in the list of replacements,
	 * and if found, replaces it with it's equivalent replacement string
	 * @param line			Line to check
	 * @param strings		List of strings to check for. Strings come in pairs, with the
	 * first being the string to match, and the second the replacement
	 */
	static void searchAndReplace(TTstring &line, const StringArray &strings);

	/**
	 * Checks the string starting at a given index for any word in the passed string array,
	 * and if found, replaces it in the line with it's replacement
	 * @param line			Line to check
	 * @param startIndex	Starting index in the start to check
	 * @param strings		List of strings to check for. Strings come in pairs, with the
	 * first being the string to match, and the second the replacement
	 * @returns				Index of the start of the following word
	 */
	static int searchAndReplace(TTstring &line, int startIndex, const StringArray &strings);

	/**
	* Checks the string starting at a given index for a number representation
	* such as roman numericals, spelled out numbers, etc. and replaces it with
	* a plain decimal representation.
	* @param line		Line to check
	* @param startIndex	Starting index in the start to check
	* @returns			Index of the start of the following word, or -1 if at end of line
	*/
	int replaceNumbers(TTstring &line, int startIndex);

	/**
	 * Checks the string starting at a given index for a number representation
	 * such as roman numericals, spelled out numbers, etc. and replaces it with
	 * a plain decimal representation.
	 * @param line			Line to check
	 * @param startIndex	Starting index in the start to check
	 * @returns				Pointer to matching number entry, if match occurred
	 */
	const NumberEntry *replaceNumbers2(TTstring &line, int *startIndex);

	int loadRequests(TTword *word);
	int considerRequests(TTword *word);
	int processRequests(TTword *word);

	int addToConceptList(TTword *word);
	int checkReferent(TTpronoun *pronoun);

	/**
	 * Creates a new parser node, and adds it to the parser's list
	 */
	void addNode(uint tag);

	/**
	 * Add a concept node
	 */
	int addConcept(TTconcept *concept);

	/**
	 * Detaches a concept from the main concept list if prseent, then deletes it
	 */
	void removeConcept(TTconcept *concept);

	/**
	 * Detaches a node from the main node list
	 */
	void removeNode(TTparserNode *node);

	/**
	 * Handles any preprocessing for the German version
	 * @param line		Line to check and update
	 */
	void preprocessGerman(TTstring &line);

	int processModifiers(int modifier, TTword *word);

	int checkForAction();
	int fn2(TTword *word);
	bool checkConcept2(TTconcept *concept, int conceptMode);
	int filterConcepts(int conceptMode, int conceptIndex);
	bool resetConcept(TTconcept **conceptPP, int conceptIndex);
public:
	CScriptHandler *_owner;
	TTsentenceConcept *_sentenceConcept;
	TTsentence *_sentence;
	int _fieldC;
	int _field10;
	int _field14;
	TTword *_currentWordP;
	StringArray _pronouns;
public:
	TTparser(CScriptHandler *owner);
	~TTparser();

	/**
	 * Preprocesses the passed input text, to handle things like lowercasing
	 * all the words, and replcaing common slang with their full equivalents
	 */
	int preprocess(TTsentence *sentence);

	int findFrames(TTsentence *sentence);

	/**
	 * Called when a concept is copied from one to another
	 */
	void conceptChanged(TTconcept *newConcept, TTconcept *oldConcept);
};

} // End of namespace Titanic

#endif /* TITANIC_TT_PARSER_H */
